Technical Sciences Grade 12 P2 Eastern Cape Mock 2022 QP

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE GRADE 12 SEPTEMBER 2022 TECHNICAL SCIENCES P2 MARKS: 75 TIME: 1½ hours This question paper consists of 14 pages, including 4 data sheets.

Downloaded from hlayiso.com 2 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2022) INSTRUCTIONS AND INFORMATION 1. This question paper consists of SEVEN questions. 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. Leave ONE line between two sub-questions, for example between QUESTION 2.1 and QUESTION 2.2. 5. You may use a non-programmable calculator. 6. You may use appropriate mathematical instruments. 7. You are advised to use the attached DATA SHEETS. 8. Show ALL formulae and substitutions in ALL calculations. 9. Round off your FINAL numerical answers to a minimum of TWO decimal places. 10. Give brief motivations, discussions, etc. where required. 11. Write neatly and legibly. Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/SEPTEMBER 2022) TECHNICAL SCIENCES P2 3 QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A–D) next to the question numbers (1.1 to 1.5) in the ANSWER BOOK, for example 1.6 D. 1.1. Which ONE of the following general formulae represents alkynes? A CnH2n-2 B CnH2n-1 C CnH2n D CnH2n+2 (2) 1.2 Which ONE of the following compounds represents a ketone? A H H B H H C C C H H C O C H H O H O H C H D H H O C C H H C O H O H H (2) 1.3 Solar cells use p-n junction to convert sunlight directly into a(n) … A magnetic field. B electric field. C magnetic flux. D electric current. (2) 1.4 In which ONE of the following options are the three compounds listed in increasing order of vapour pressure? A propanoic acid, pentane, butan-1-ol B propanoic acid, butan-1-ol, pentane C pentane, butan-1-ol, propanoic acid D butan-1-ol, propanoic acid, pentane (2) Copyright reserved Please turn over

Downloaded from hlayiso.com 4 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2022) 1.5 The cell notation for a standard Zn-Cu electrochemical cell is: A Cu2+(aq) / Cu(s) // Zn(s) / Zn2+(aq) B Zn(s) / Zn2+(aq) // Cu2+(aq) / Cu(s) C Cu(s) / Zn2+(aq) // Cu2+(aq) / Zn(s) D Zn(s) / Zn2+(aq) // Cu(s) / Cu2+(aq) (2) [10] Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/SEPTEMBER 2022) 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 the functional groups. 2.1 Define the term hydrocarbons. (2) 2.2 Consider the organic molecules listed below: A B H H H H O hex-2-ene H C C C C C H H H H H C D H H O 3-Chloro-But-1-ene H C C C O H H H 2.2.1 Define the term isomers in words. (2) 2.2.2 Draw the structural formula of a positional isomer of A. (2) 2.2.3 Write down the name of the homologous series to which B belongs. (1) 2.2.4 Give the IUPAC name for the chain isomer of compound C. (2) 2.3 The diagram below shows a monomer of the organic compound used for polyethylene. This is the industrial organic product used in the preparation of plastics. H H A C C A n H H Define the term monomer in words. (2) [11] Copyright reserved Please turn over

Downloaded from hlayiso.com 6 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2022) QUESTION 3 (Start on a new page.) The table below shows the vapour pressure of various organic compounds at 25 °C. Compound Molar mass Vapour pressure (g mol-1) (x102 Pa) pentane 72 573,0 hexane 86 160,0 propan-1-ol 60 21,0 propan-2-ol 60 44,0 butan-1-ol 74 6,2 butan-2-ol 74 18,3 pentan-1-ol 88 2,2 pentan-2-ol 88 8,04 ethanoic acid 60 15,3 propanone 58 240,0 3.1 Write down the general formula of the homologous series to which pentane belongs. (1) 3.2 Draw the structural formula of propanone. (2) 3.3 Give the name of a functional isomer of propanone. (1) 3.4 Write down the name of the intermolecular forces involved in: 3.4.1 Alcohols (1) 3.4.2 Alkanes (1) 3.5 Refer to the table of organic compounds above to state and explain the relationship between vapour pressure and the strength of intermolecular forces. (2) 3.6 Which compound will have the higher boiling point: Ethanoic acid or propan-1-ol? Explain by referring to type of intermolecular forces and energy. (3) [11] Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/SEPTEMBER 2022) TECHNICAL SCIENCES P2 7 QUESTION 4 (Start on a new page.) Pent-1-ene can be converted to other compounds by means of different organic reactions represented by U, V, W and X, as shown below. U Alcohol Pent-1-ene X V Alkane W Haloalkane Br2 4.1 Write down the TYPE of the reaction represented by: 4.1.1 U (1) 4.1.2 W (1) 4.1.3 V (1) 4.2 During reaction X, the alkyl halide (haloalkane) reacts. 4.2.1 Give the NAME of a suitable base used. (1) 4.2.2 Name TWO reaction conditions for reaction X. (2) 4.2.3 Write down the balanced reaction using structural formulae for the reaction of Pent-1-ene with hydrogen bromide to form a haloalkane. (3) 4.3 Fossil fuels are formed by the natural process of decomposition of organisms under heat and pressure. They contain a high percentage of carbon and include fuels such as coal, petrol and natural gases. Alkanes are the most important fossil fuels. The combustion of alkanes (also known as oxidation) is highly exothermic. Write down a balanced reaction for the complete combustion of pentane. (3) [12] Copyright reserved Please turn over

Downloaded from hlayiso.com 8 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2022) QUESTION 5 (Start on a new page.) Semiconductor devices such as diodes are widely used in modern electronics. Depletion region P-type N-Type Diode 5.1 Define the term semiconductor in words. (2) 5.2 Phosphorus was added to silicon in small quantities. It was then found that the electrical conductivity of silicon improved. 5.2.1 Identify the described process in the above statement. (1) 5.2.2 What type of a semiconductor material (P-type or N-type) is formed during this process? Give a reason for your answer. (2) [5] Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/SEPTEMBER 2022) TECHNICAL SCIENCES P2 9 QUESTION 6 (Start on a new page.) In the electrolytic cell, represented below, two CARBON RODS are used as electrodes and a concentrated copper (II) chloride solution is used as an electrolyte. battery P Q CuCℓ2(aq) When the cell is functioning, the following observations are made: • A gas is released at electrode P • Electrode Q is coated with a reddish-brown layer 6.1 Define the term electrolyte. (2) 6.2 Write down a half-reaction to explain the observation made at: 6.2.1 Electrode P (2) 6.2.2 Electrode Q (2) 6.3 Write down the energy conversion that is taking place in this cell. (1) 6.4 Which electrode, P or Q, is the cathode? Give a reason for your answer. (2) 6.5 The carbon rods in the above cell are now replaced with COPPER RODS. The following observations are made at electrode P: • No gas is released • Its surface appears rough and eroded 6.5.1 Refer to the RELATIVE STRENGTHS OF REDUCING AGENTS to explain this observation. (3) 6.5.2 This cell can be used for the electroplating of a bracelet in the industry. Which electrode (P or Q) will be replaced with a bracelet during the electroplating process? (1) [13] Copyright reserved Please turn over

Downloaded from hlayiso.com 10 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2022) QUESTION 7 (Start on a new page.) The potential difference of a galvanic cell, measured experimentally by learners in a Technical Sciences laboratory, is COMPARED with its potential difference calculated at standard conditions. They set up the galvanic cell shown below. The voltmeter measures an initial reading of 0,19 V. 7.1 Write down the energy conversion that takes place in this cell. (1) 7.2 State ONE function of the salt bridge. (1) 7.3 Write down the half-reaction that takes place at the anode. (2) 7.4 In which direction do electrons flow in the external circuit when this cell delivers a current? Write down only FROM Sn TO Cd or FROM Cd TO Sn. (1) 7.5 Write down the balanced net (overall) cell reaction. (3) 7.6 Use the Table of STANDARD REDUCTION POTENTIALS to calculate the initial potential difference (emf) of the above cell at STANDARD CONDITIONS. (3) 7.7 From the results obtained, the learners concluded that the measured potential difference differs from the calculated potential difference. Give TWO possible reasons for this difference in values. (2) [13] TOTAL: 75 Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/SEPTEMBER 2022) TECHNICAL SCIENCES P2 11 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 p 1,013 × 105 Pa Standaarddruk Standard temperature Tθ 273 K Standaardtemperatuur TABLE 2: FORMULAE/TABEL 2: FORMULES Eθcell = Eθcathode – Eθanode / Eθsel = Eθkatode – Eθanode Eθcell = Eθreduction – Eθoxidation / Eθsel = Eθreduksie – Eθoksidasie Eθcell = Eθoxidising agent – Eθreducing agent / Eθsel = Eθoksideermiddel – Eθreduseermiddel Copyright reserved Please turn over

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Downloaded from hlayiso.com 12 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2022) 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) (III) (IV) (V) (VI) (VII) (VIII) KEY/ SLEUTEL Atoomgetal 1 Atomic number 2 H He 2,1 1 29 4 3 4 Elektronegatiwiteit Simbool 5 6 7 8 9 10 Li Be Electronegativity 1,9 Symbol B C N O F Ne 1,0 1,5 Cu 2,0 2,5 3,0 3,5 4,0 7 9 11 12 14 16 19 20 11 12 13 14 15 16 17 18 Na Mg Aℓ Si P S Cℓ Ar 0,9 1,2 Benaderde relatiewe atoommassa 1,5 1,8 2,1 2,5 3,0 23 24 Approximate relative atomic mass 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 Copyright reserved Please turn over

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Downloaded from hlayiso.com (EC/SEPTEMBER 2022) TECHNICAL SCIENCES P2 13 TABLE 4A: STANDARD REDUCTION POTENTIALS TABEL 4A: STANDAARD REDUKSIEPOTENSIALE Half-reactions/Halfreaksies E θ (V) F2(g) + 2e− ⇌ 2F− + 2,87 3+ Co + e − ⇌ Co2+ + 1,81 H2O2 + 2H +2e + − ⇌ 2H2O +1,77 − MnO 4 + 8H+ + 5e− ⇌ 2+ Mn + 4H2O + 1,51 Cℓ2(g) + 2e− ⇌ 2Cℓ − + 1,36 2− Cr2O 7 + 14H+ + 6e− ⇌ 3+ 2Cr + 7H2O + 1,33 O2(g) + 4H+ + 4e− ⇌ 2H2O + 1,23 MnO2 + 4H+ + 2e− ⇌ Mn2+ + 2H2O + 1,23 Pt2+ + 2e− ⇌ Pt + 1,20 Br2(ℓ) + 2e− ⇌ 2Br− + 1,07 − NO 3 + 4H+ + 3e− ⇌ NO(g) + 2H2O + 0,96 Increasing oxidising ability/Toenemende oksiderende vermoë Increasing reducing ability/Toenemende reduserende vermoë 2+ Hg + 2e − ⇌ 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 2+ Cu + 2e − ⇌ Cu + 0,34 2− SO 4 + 4H+ + 2e− ⇌ SO2(g) + 2H2O + 0,17 Cu2+ + e− ⇌ Cu + + 0,16 Sn4+ + 2e− ⇌ Sn2+ + 0,15 S + 2H+ + 2e− ⇌ H2S(g) + 0,14 2H+ + 2e− ⇌ H2(g) 0,00 Fe3+ + 3e− ⇌ Fe − 0,06 Pb2+ + 2e− ⇌ Pb − 0,13 Sn2+ + 2e− ⇌ Sn − 0,14 Ni2+ + 2e− ⇌ Ni − 0,27 Co2+ + 2e− ⇌ Co − 0,28 2+ Cd + 2e − ⇌ Cd − 0,40 3+ Cr + e − ⇌ Cr2+ − 0,41 2+ Fe + 2e − ⇌ Fe − 0,44 Cr3+ + 3e− ⇌ Cr − 0,74 Zn2+ + 2e− ⇌ Zn − 0,76 2H2O + 2e− ⇌ H2(g) + 2OH− − 0,83 2+ Cr + 2e − ⇌ Cr − 0,91 Mn2+ + 2e− ⇌ Mn − 1,18 Aℓ3+ + 3e− ⇌ Aℓ − 1,66 Mg2+ + 2e− ⇌ Mg − 2,36 + Na + e − ⇌ Na − 2,71 Ca2+ + 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 Copyright reserved Please turn over

Downloaded from hlayiso.com 14 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2022) TABLE 4B: STANDARD REDUCTION POTENTIALS TABEL 4B: STANDAARD REDUKSIEPOTENSIALE Half-reactions/Halfreaksies E θ (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 2+ Mg + 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 Cr3+ + 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 Sn2+ + 2e− ⇌ Sn − 0,14 2+ Pb + 2e − ⇌ Pb − 0,13 Fe3+ + 3e− ⇌ Fe − 0,06 2H+ + 2e− ⇌ H2(g) 0,00 S + 2H+ + 2e− ⇌ H2S(g) + 0,14 Sn4+ + 2e− ⇌ Sn2+ + 0,15 Cu2+ + e− ⇌ Cu+ + 0,16 2− SO 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− ⇌ Mn2+ + 2H2O + 1,23 O2(g) + 4H+ + 4e− ⇌ 2H2O + 1,23 2− Cr2O 7 + 14H+ + 6e− ⇌ 3+ 2Cr + 7H2O + 1,33 Cℓ2(g) + 2e− ⇌ 2Cℓ− + 1,36 − MnO 4 + 8H+ + 5e− ⇌ Mn2+ + 4H2O + 1,51 H2O2 + 2H+ +2 e− ⇌ 2H2O +1,77 3+ Co + e − ⇌ Co2+ + 1,81 F2(g) + 2e− ⇌ 2F− + 2,87 Copyright reserved Please turn over