# Technical Sciences Grade 12 P2 Eastern Cape Mock 2023 QP

> Grade 12 Technical Sciences Paper 2 question paper from the Eastern Cape Mock Exam 2023 (English), 16 pages. Read online or download the free PDF.

- Page: https://www.hlayiso.com/library/tech-sciences-p2-gr12-qp-sept2023-english/125d67f6-f412-4535-9181-797b2ad8ef14
- Updated: 2026-09-27
- Subject: Technical Sciences
- Grade: Grade 12
- Language: English
- Document type: Question paper
- Year: 2023
- Exam period: Eastern Cape Mock Exam
- Paper: 2
- Curriculum: CAPS
- Pages: 16

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Technical Sciences · Grade 12 · Eastern Cape Mock Exam · 2023 · English. Question paper, 16 pages. Read online or download the PDF.

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### Page 1

NATIONAL
                          SENIOR CERTIFICATE

                                  GRADE 12

                             SEPTEMBER 2023

                      TECHNICAL SCIENCES P2

MARKS:   75

TIME:    1½ hours

              This question paper consists of 15 pages, including 4 data sheets.

### Page 2

2                          TECHNICAL SCIENCES P2                  (EC/SEPTEMBER 2023)

 INSTRUCTIONS AND INFORMATION

 1.    Answer ALL the questions in the ANSWER BOOK.

 2.    Start EACH question on a NEW page in the ANSWER BOOK.

 3.    Number the answers correctly according to the numbering system used in
       this question paper.

 4.    You may use a non-programmable calculator.

 5.    Leave ONE line open between sub questions, i.e. QUESTION 2.1 and
       QUESTION 2.2.

 6.    You are advised to use the attached DATA SHEETS.

 7.    Show ALL formulae and substitutions in ALL calculations.

 8.    Round off your FINAL numerical answers to a minimum of TWO decimal
       places.

 9.    Give brief motivations, discussions, etc. where required.

 10. Write neatly and legibly.

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### Page 3

(EC/SEPTEMBER 2023)              TECHNICAL SCIENCES P2                                3

 QUESTION 1: MULTIPLE-CHOICE QUESTIONS

 Various options are provided as answers to the following questions. Choose the
 answer and write only the correct letter (A–D) next to the question numbers
 (1.1 to 1.5) in the ANSWER BOOK, for example 1.6 D.

 1.1     CnH2n+1OH is the GENERAL FORMULA for …

         A    alkanes.

         B    aldehydes.

         C    alcohols.

         D    alkenes.                                                                (2)

 1.2     Consider the structural formula of an organic compound below.

                                       H      H
                                 H     C      C     O
                                       H
         Which ONE of the following is the correct IUPAC name of this compound?

         A    Ethanone

         B    Ethene

         C    Ethanol

         D    Ethanal                                                                 (2)

 1.3     Which ONE of the following is an unsaturated hydrocarbon?

         A    CH3CH2CH2OH

         B    CH2CHCH3

         C    CH3CH2(CH2)2CH2CH3

         D    CH3COOCH3                                                               (2)

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### Page 4

4                           TECHNICAL SCIENCES P2                          (EC/SEPTEMBER 2023)

 1.4     Which ONE of the following redox reactions will occur spontaneously?

         A      Cu(s) + 2H+  Cu2+ + H2(g)

         B      Mg(s) + 2H+  Mg2+ + H2(g)

         C      2Ag(s) + 2H+  2Ag+ + H2(g)

         D      Hg(ℓ) + 2H+  Hg2+ + H2(g)                                                     (2)

 1.5     What will happen at the negative electrode of a voltaic (galvanic) cell and at
         the negative electrode of an electrolytic cell?

                     Voltaic (galvanic) cell                 Electrolytic cell
         A                 Oxidation                            Reduction

         B                 Reduction                            Oxidation

         C                 Oxidation                            Oxidation

         D                 Reduction                            Reduction                      (2)
                                                                                              [10]

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### Page 5

(EC/SEPTEMBER 2023)                    TECHNICAL SCIENCES P2                                 5

 QUESTION 2 (Start on a new page.)

 Organic chemistry is the chemistry of organic molecules divided into homologous
 series which are identified by their functional groups. The letters A to H in the table
 below represent eight organic compounds.

  A                                            B

            CH3CH2CH(CH3)CH2OH                         CH3CH2CH2COOCH2CH3

  C                                            D
                  H Br H H
                   │ │ │ │
               H - C - C - C - C - Cl                           CH2CH2
                   │ │ │ │
                   Cl H H H
  E                                            F                     H
                                                                 O
                                                       H                   H
                       Hexane
                                                   H   C         C         C   H
                                                       H         H         H

  G        H           H                       H
       H C             C          C        O                 CH3CH2CO2H
           H           H          H

 2.1     Define the term functional group.                                                   (2)

 2.2     Write down the:

         2.2.1       Letter that represents a SECONDARY alcohol                              (1)

         2.2.2       Name of the functional group of compound H                              (1)

         2.2.3       Name of the homologous series to which compound G belongs               (1)

         2.2.4       IUPAC name of compound C                                                (2)

         2.2.5       NAME of the polymer formed from compound D                              (1)

         2.2.6       Balanced equation, using MOLECULAR FORMULAE, for the
                     combustion of compound E in excess oxygen                               (3)

         2.2.7       IUPAC name of compound A                                                (2)

         2.2.8       General formula of the homologous series to which compound B
                     belongs                                                                 (1)

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### Page 6

6                           TECHNICAL SCIENCES P2                      (EC/SEPTEMBER 2023)

 2.3.   A few drops of fresh reddish-brown bromine water are added to
        compound D in a test tube.

        2.3.1    Describe what will be observed in the test tube.                       (1)

        2.3.2    Use structural formulae to write down a balanced equation for the
                 reaction that takes place in the test tube.                           (4)
                                                                                      [19]

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### Page 7

(EC/SEPTEMBER 2023)                 TECHNICAL SCIENCES P2                               7

 QUESTION 3 (Start on a new page.)

 Two compounds P and Q, have the molecular formula C2H4O2.                              (2)

 3.1.     What is meant by the term structural isomers?

 3.2.     Compound P has a lower vapour pressure than compound Q.

          3.2.1      How will the boiling point of compound P compare to that of
                     compound Q?

                     Only write HIGHER THAN, LOWER THAN, or EQUAL TO.                   (1)

          3.2.2      Write down the NAME of compound P.                                 (1)

          3.2.3      To which class of organic compound does compound Q belong?         (1)

          3.2.4      Write down the structural formula for compound Q and give its
                     IUPAC name.                                                        (3)

          3.2.5      Explain in terms of INTERMOLECULAR FORCES and ENERGY
                     why compound P has a lower vapour pressure than compound Q.       (3)
                                                                                      [11]

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### Page 8

8                              TECHNICAL SCIENCES P2                    (EC/SEPTEMBER 2023)

 QUESTION 4 (Start on a new page.)

 Consider the following sequence of organic reactions and answer the questions
 that follow. Reactions are labelled from I to VI while organic compounds are labelled
 from A to D.

                                                                       CO2 + H2O

                                                                           I

         C3H8O              II                           III
                                            C3H6
           A                                                              C3H8
                                                B
                            IV                                                 C
                                                V

                                                               VI

                                      CH3CHCℓCH3

                                            D

 4.1    Give the reagent needed for each of the following reactions:

        4.1.1    Reaction III                                                               (1)

        4.1.2    Reaction V                                                                 (1)

 4.2    Compound A is a major product of reaction IV.

        4.2.1    Name the type of reaction that takes place.                                (1)

        4.2.2    Write down the structural formula of compound A.                           (2)

 4.3    Reaction I is a combustion reaction.

        Write down the balanced chemical equation for this reaction.                        (2)
                                                                                            [7]

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### Page 9

(EC/SEPTEMBER 2023)               TECHNICAL SCIENCES P2                                  9

 QUESTION 5 (Start on a new page.)

 Semiconductor devices such as diodes and transistors are widely used in modern
 electronics.

 5.1.   Define the term semiconductor.                                                   (2)

 5.2.   Arsenic was added to silicon in small quantities. It was then found that the
        electrical conductivity of silicon has improved.

        5.2.1 Name the process described in the above statements.                        (1)

        5.2.2 What type of a semiconductor material is formed during this
              process?                                                                   (1)

        5.2.3 Give a reason for your answer in QUESTION 5.2.2.                           (1)
                                                                                         [5]

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### Page 10

10                            TECHNICAL SCIENCES P2                        (EC/SEPTEMBER 2023)

 QUESTION 6 (Start on a new page.)

 The diagram below represents an electrochemical cell used to decompose a
 concentrated copper(II)chloride solution using inactive electrodes.

        Electrode A                                              Electrode B

                                    Concentrated

                                  copper(II)chloride

 6.1.     Define the term electrolysis in words.                                            (2)

 6.2.     Write down the energy conversion that takes place in this cell.                   (1)

 6.3      At which electrode does reduction take place? Write down A or B only.             (1)

 6.4      Write down the:

          6.4.1.     NAME of the gas formed while the cell is functioning                   (1)

          6.4.2.     Half-reaction that takes place at electrode A                          (2)

          6.4.3      NAME or FORMULA of the oxidising agent.
                     Give a reason for the answer                                           (2)

          6.4.4      NAME of a substance that can be used as electrodes in this cell        (1)

 6.5.     How does the concentration of the copper(II)chloride solution change as
          the reaction proceeds?

          Write down INCREASES, DECREASES or NO CHANGE.

          Give a reason for your answer.                                                   (2)
                                                                                          [12]

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### Page 11

(EC/SEPTEMBER 2023)                 TECHNICAL SCIENCES P2                                     11

 QUESTION 7 (Start on a new page.)
 Learners use an electrochemical cell as shown in the diagram below in an
 investigation to compare the reducing abilities of different metals.

                                             V
                           -                                    +
       Half-cell X                   Salt Bridge                    Half-cell Y
                                     BBrbridge

 7.1      Name the type of electrochemical cell depicted in the diagram above.                 (1)

 7.2      What will the voltmeter reading be if the salt bridge is removed?                    (2)

 7.3      Name TWO standard conditions for this experiment.                                    (2)

 7.4      In their investigation, they use different combinations of half reactions as
          depicted in the table below, to compare the reducing abilities of Cu, Zn
          and Al. The cell potential for each combination of the half cells is recorded
          in the table below.

                                                                       VOLTMETER
          COMBINATION            Half-Cell X        Half-Cell Y
                                                                       READING (V)
                     1            Cu/Cu2+             Al/Al3+             -1,8
                     2             Al/Al3+           Zn/Zn2+              +0,8
                     3            Zn/Zn2+            Cu/Cu2+              +1,0

          Write down a:

          7.4.1 Possible reason why the voltmeter reading for a copper-aluminium
                cell is negative                                                               (2)

          7.4.2 Suitable conclusion for this investigation                                     (2)

 7.5      Write down the NAME or SYMBOL of the:

          7.5.1      Metal which is oxidised in COMBINATION 2                                  (1)

          7.5.2      Reducing agent in COMBINATION 3                                          (1)
                                                                                             [11]

                                                                              TOTAL:           75

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### Page 12

12                              TECHNICAL SCIENCES P2                                    (EC/SEPTEMBER 2023)

                                 NATIONAL SENIOR CERTIFICATE
                                NASIONALE SENIOR SERTIFIKAAT

                         DATA FOR TECHNICAL SCIENCES GRADE 12
                                  PAPER 2 (CHEMISTRY)

                  GEGEWENS VIR TEGNIESE WETENSKAPPE GRAAD 12
                              VRAESTEL 2 (CHEMIE)

TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES

          NAAM/NAME                             SIMBOOL/SYMBOL                     WAARDE/VALUE
  Standard pressure
                                                             𝑝𝜃                      1,013 × 105 Pa
  Standaarddruk
  Molar gas volume at STP
                                                             Vm                       22,4 dm3∙mol-1
  Molêre gasvolume teen STD
  Standard temperature
                                                             Tθ                            273 K
  Standaardtemperatuur
  Charge on electron
  Lading op elektron
                                                              e                       -1,6 × 10-19 C

  Avogadro’s constant
                                                             NA                      6,02 × 1023 mol-1
  Avogadro se konstante

TABLE 2: FORMULAE/TABEL 2: FORMULES

       m                          n                      m
  n = M OR/OF                 c = V OR/OF c = MV                  pH = -log[H3O+]

        N                  ca Va   n                              Kw = [H3O+][OH-] = 1 x 10-14 at /by 298K
  n= N       OR/OF         cb Vb
                                 = na P
         A                          b

  n= V
       V                   pV = nRT
        m

  Eθcell = Eθcathode – Eθanode / Eθsel = Eθkatode – Eθanode

  Eθcell = Eθreduction – Eθoxidation / Eθsel = Eθreduksie – Eθoksidasie

  Eθcell = Eθoxidising agent – Eθreducing agent / Eθsel = Eθoksideermiddel – Eθreduseermiddel

                          Q                          Q
  q = IΔt            n= e             OR/OF n = q
                                                      e

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### Page 13

EC/SEPTEMBER 2023)                                                    TECHNICAL SCIENCES P2                                                                 13

TABLE 3: THE PERIODIC TABLE OF ELEMENTS/TABEL 3: DIE PERIODIEKE TABEL VAN ELEMENTE
1           2        3         4         5         6 7               8          9         10      11       12      13       14      15      16      17       18
(I)         (II)                                                         Atoomgetal                                (III)    (IV)    (V)     (VI)    (VII)    (VIII)
                                          KEY/ SLEUTEL
      1                                                              Atomic number                                                                               2
      H                                                                                                                                                          He
2,1                                                                            29
      1                                                                                                                                                          4
                                               Elektronegatiwiteit                         Simbool
      3        4                                                         1,9               Symbol
                                                                                                                      5       6       7       8       9          10
1,0
      Li
            1,5
               Be                               Electronegativity              Cu                                  2,0
                                                                                                                      B       C
                                                                                                                            2,5
                                                                                                                                      N
                                                                                                                                    3,0
                                                                                                                                              O
                                                                                                                                            3,5
                                                                                                                                                      F
                                                                                                                                                    4,0
                                                                                                                                                                 Ne
      7        9                                                                                                      11      12      14      16      19         20
      11       12                                                                                                     13      14      15      16      17         18
      Na       Mg                                             Benaderde relatiewe atoommassa                          Aℓ      Si      P       S       Cℓ         Ar
0,9         1,2                                               Approximate relative atomic mass                     1,5      1,8     2,1     2,5     3,0
      23       24                                                                                                     27      28      31      32      35,5       40
      19       20        21        22        23        24      25        26         27      28      29       30       31      32      33      34      35         36
      K        Ca        Sc        Ti        V         Cr      Mn        Fe         Co      Ni      Cu       Zn       Ga      Ge      As      Se      Br         Kr
0,8         1,0      1,3       1,5       1,6       1,6       1,5     1,8        1,8       1,8     1,9      1,6     1,6      1,8     2,0     2,4     2,8
      39       40        45        48        51        52      55        56         59      59      63,5     65       70      73      75      79      80         84
      37       38        39        40        41        42      43        44         45      46      47       48       49      50      51      52      53         54
      Rb       Sr        Y         Zr        Nb        Mo      Tc        Ru         Rh      Pd      Ag       Cd       In      Sn      Sb      Te      I          Xe
0,8         1,0      1,2       1,4                 1,8       1,9     2,2        2,2       2,2     1,9      1,7     1,7      1,8     1,9     2,1     2,5
      86       88        89        91        92        96                101        103     106     108      112      115     119     122     128     127        131
      55       56        57        72        73        74      75        76         77      78      79       80       81      82      83      84      85         86
      Cs       Ba        La        Hf        Ta        W       Re        Os         Ir      Pt      Au       Hg       Tℓ      Pb      Bi      Po      At         Rn
0,7   133   0,9137       139   1,6 179       181       184     186       190        192     195     197      201   1,8204   1,8
                                                                                                                              207   1,9
                                                                                                                                      209   2,0     2,5
      87       88        89
      Fr       Ra        Ac
0,7         0,9226                        58        59        60      61            62     63      64       65      66       67      68      69      70          71
                                          Ce        Pr        Nd      Pm            Sm     Eu      Gd       Tb      Dy       Ho      Er      Tm      Yb          Lu
                                          140       141       144                   150    152     157      159     163      165     167     169     173         175
                                         90        91        92      93         94        95      96       97      98       99      100     101     102      103
                                         Th        Pa        U       Np         Pu        Am      Cm       Bk      Cf       Es      Fm      Md      No       Lr
                                         232                 238

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### Page 15

14                                                                                   TECHNICAL SCIENCES P2                                            (EC/SEPTEMBER 2023)

                                                                           TABLE 4A: STANDARD REDUCTION POTENTIALS
                                                                           TABEL 4A: STANDAARD REDUKSIEPOTENSIALE
                                                                                       Half-reactions/Halfreaksies                           E𝛉 (V)
                                                                          F2(g) + 2e−                         ⇌   2F−                        + 2,87
                                                                          Co   3+
                                                                                     +e       −               ⇌   Co2+                       + 1,81
                                                                          H2O2 + 2H+ +2e−                     ⇌   2H2O                       +1,77
                                                                          MnO         −     +
                                                                                      4 + 8H + 5e
                                                                                                  −           ⇌   Mn2+ + 4H2O                + 1,51
                                                                          Cℓ2(g) + 2e                 −       ⇌   2Cℓ       −                + 1,36
                                                                          Cr2O        2−     +
                                                                                      7 + 14H + 6e
                                                                                                   −          ⇌   2Cr       3+
                                                                                                                                    + 7H2O   + 1,33
                                                                          O2(g) + 4H+ + 4e−                   ⇌   2H2O                       + 1,23
                                                                          MnO2 + 4H+ + 2e−                    ⇌   Mn2+ + 2H2O                + 1,23
                                                                          Pt   2+
                                                                                    + 2e      −               ⇌   Pt                         + 1,20
                                                                          Br2(ℓ) + 2e−                        ⇌   2Br−                       + 1,07
                                                                          NO         −     +
                                                                                     3 + 4H + 3e
                                                                                                 −            ⇌   NO(g) + 2H2O               + 0,96

                                                                                                                                                            Increasing reducing ability/Toenemende reduserende vermoë
                                                                          Hg2+ + 2e−                          ⇌

             Increasing oxidising ability/Toenemende oksiderende vermoë
                                                                                                                  Hg(ℓ)                      + 0,85
                                                                               +
                                                                          Ag + e          −                   ⇌   Ag                         + 0,80
                                                                          NO         −     +
                                                                                     3 + 2H + e
                                                                                                −             ⇌   NO2(g) + H2O               + 0,80
                                                                          Fe3+ + e−                           ⇌   Fe2+                       + 0,77
                                                                          O2(g) + 2H+ + 2e−                   ⇌   H2O2                       + 0,68
                                                                          I2 + 2e     −                       ⇌   2I   −                     + 0,54
                                                                          Cu+ + e−                            ⇌   Cu                         + 0,52
                                                                          SO2 + 4H+ + 4e−                     ⇌   S + 2H2O                   + 0,45
                                                                          2H2O + O2 + 4e                  −   ⇌   4OH           −            + 0,40
                                                                          Cu   2+
                                                                                     + 2e         −           ⇌   Cu                         + 0,34
                                                                          SO         2−    +
                                                                                     4 + 4H + 2e
                                                                                                 −            ⇌   SO2(g) + 2H2O              + 0,17
                                                                          Cu2+ + e−                           ⇌   Cu+                        + 0,16
                                                                          Sn   4+
                                                                                     + 2e         −           ⇌   Sn       2+
                                                                                                                                             + 0,15
                                                                          S + 2H+ + 2e−                       ⇌   H2S(g)                     + 0,14
                                                                          2H+ + 2e−                           ⇌   H2(g)                      0,00
                                                                          Fe3+ + 3e−                          ⇌   Fe                         − 0,06
                                                                          Pb   2+
                                                                                     + 2e         −           ⇌   Pb                         − 0,13
                                                                          Sn2+ + 2e−                          ⇌   Sn                         − 0,14
                                                                          Ni2+ + 2e−                          ⇌   Ni                         − 0,27
                                                                          Co2+ + 2e−                          ⇌   Co                         − 0,28
                                                                          Cd   2+
                                                                                     + 2e         −           ⇌   Cd                         − 0,40
                                                                          Cr3+ + e−                           ⇌   Cr2+                       − 0,41
                                                                          Fe2+ + 2e−                          ⇌   Fe                         − 0,44
                                                                          Cr   3+
                                                                                    + 3e      −               ⇌   Cr                         − 0,74
                                                                          Zn2+ + 2e−                          ⇌   Zn                         − 0,76
                                                                          2H2O + 2e−                          ⇌   H2(g) + 2OH−               − 0,83
                                                                          Cr2+ + 2e−                          ⇌   Cr                         − 0,91
                                                                          Mn    2+
                                                                                     + 2e         −           ⇌   Mn                         − 1,18
                                                                          Aℓ3+ + 3e−                          ⇌   Aℓ                         − 1,66
                                                                          Mg2+ + 2e−                          ⇌   Mg                         − 2,36
                                                                          Na+ + e−                            ⇌   Na                         − 2,71
                                                                          Ca   2+
                                                                                     + 2e         −           ⇌   Ca                         − 2,87
                                                                          Sr2+ + 2e−                          ⇌   Sr                         − 2,89
                                                                          Ba2+ + 2e−                          ⇌   Ba                         − 2,90
                                                                          Cs+ + e-                            ⇌   Cs                         - 2,92
                                                                          K+ + e−                             ⇌   K                          − 2,93
                                                                          Li+ + e−                            ⇌   Li                         − 3,05

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### Page 16

(EC/SEPTEMBER 2023)                                                                                    TECHNICAL SCIENCES P2                                                                       15
                                                                          TABLE 4B: STANDARD REDUCTION POTENTIALS
                                                                          TABEL 4B: STANDAARD REDUKSIEPOTENSIALE
                                                                                           Half-reactions/Halfreaksies        E𝛉 (V)
                                                                         Li+ + e−                         ⇌   Li              − 3,05
                                                                         K + + e−                         ⇌   K               − 2,93
                                                                         Cs+ + e−                         ⇌   Cs              − 2,92
                                                                         Ba2+ + 2e−                       ⇌   Ba              − 2,90
                                                                         Sr2+ + 2e−                       ⇌   Sr              − 2,89
                                                                         Ca2+ + 2e−                       ⇌   Ca              − 2,87
                                                                            +
                                                                         Na + e        −
                                                                                                          ⇌   Na              − 2,71
                                                                         Mg2+ + 2e−                       ⇌   Mg              − 2,36
                                                                         Aℓ3+ + 3e−                       ⇌   Aℓ              − 1,66
                                                                         Mn2+ + 2e−                       ⇌   Mn              − 1,18
                                                                         Cr2+ + 2e−                       ⇌   Cr              − 0,91

                                                                                                                                       Increasing reducing ability/Toenemende reduserende vermoë
                                                                         2H2O + 2e−                       ⇌   H2(g) + 2OH−    − 0,83

            Increasing oxidising ability/Toenemende oksiderende vermoë
                                                                         Zn2+ + 2e−                       ⇌   Zn              − 0,76
                                                                           3+
                                                                         Cr + 3e           −              ⇌   Cr              − 0,74
                                                                         Fe2+ + 2e−                       ⇌   Fe              − 0,44
                                                                         Cr3+ + e−                        ⇌   Cr2+            − 0,41
                                                                         Cd2+ + 2e−                       ⇌   Cd              − 0,40
                                                                         Co2+ + 2e−                       ⇌   Co              − 0,28
                                                                         Ni2+ + 2e−                       ⇌   Ni              − 0,27
                                                                            2+
                                                                         Sn + 2e           −              ⇌   Sn              − 0,14
                                                                         Pb2+ + 2e−                       ⇌   Pb              − 0,13
                                                                         Fe3+ + 3e−                       ⇌   Fe              − 0,06
                                                                         2H+ + 2e−                        ⇌   H2(g)           0,00
                                                                         S + 2H+ + 2e−                    ⇌   H2S(g)          + 0,14
                                                                            4+
                                                                         Sn + 2e           −
                                                                                                          ⇌   Sn       2+
                                                                                                                              + 0,15
                                                                         Cu2+ + e−                        ⇌   Cu+             + 0,16
                                                                         SO      2−    +
                                                                                 4 + 4H + 2e
                                                                                            −             ⇌   SO2(g) + 2H2O   + 0,17
                                                                            2+
                                                                         Cu + 2e           −              ⇌   Cu              + 0,34
                                                                         2H2O + O2 + 4e−                  ⇌   4OH−            + 0,40
                                                                         SO2 + 4H+ + 4e−                  ⇌   S + 2H2O        + 0,45
                                                                         Cu+ + e−                         ⇌   Cu              + 0,52
                                                                         I2 + 2e   −                      ⇌   2I   −
                                                                                                                              + 0,54
                                                                         O2(g) + 2H+ + 2e−                ⇌   H2O2            + 0,68
                                                                         Fe3+ + e−                        ⇌   Fe2+            + 0,77

                                                                         NO      −     +
                                                                                 3 + 2H + e
                                                                                           −              ⇌   NO2(g) + H2O    + 0,80
                                                                            +
                                                                         Ag + e        −                  ⇌   Ag              + 0,80
                                                                         Hg2+ + 2e−                       ⇌   Hg(ℓ)           + 0,85

                                                                         NO      −     +
                                                                                 3 + 4H + 3e
                                                                                            −
                                                                                                          ⇌   NO(g) + 2H2O    + 0,96

                                                                         Br2(ℓ) + 2e           −          ⇌   2Br      −
                                                                                                                              + 1,07
                                                                         Pt2+ + 2 e−                      ⇌   Pt              + 1,20
                                                                         MnO2 + 4H + 2e        +   −      ⇌   Mn + 2H2O2+
                                                                                                                              + 1,23
                                                                         O2(g) + 4H+ + 4e−                ⇌   2H2O            + 1,23
                                                                         Cr2O       2−     +
                                                                                    7 + 14H + 6e
                                                                                                −         ⇌   2Cr + 7H2O3+
                                                                                                                              + 1,33
                                                                         Cℓ2(g) + 2e           −          ⇌   2Cℓ       −
                                                                                                                              + 1,36
                                                                         MnO       −     +
                                                                                   4 + 8H + 5e
                                                                                              −           ⇌   Mn + 4H2O2+
                                                                                                                              + 1,51

                                                                         H2O2 + 2H +2 e        +   −
                                                                                                          ⇌   2H2O            +1,77
                                                                         Co3+ + e−                        ⇌   Co2+            + 1,81
                                                                         F2(g) + 2e−                      ⇌   2F−             + 2,87

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