Physical Sciences Grade 12 Mpumalanga Mock 2016 QP

education 4) DEPARTMENT: EDUCATION MPUMALANGA PROVINCE NATIONAL SENIOR CERTIFICATE MARKS: 150 TIME: 3 hours This question paper consists of 18 pages and 4 data sheets. Q 2 Physical Sciences P2 NCS MDE/September 2016 INSTRUCTIONS AND INFORMATION 1. Write your name in the appropriate space on the ANSWER BOOK, 2. This.question paper consists of TEN questions. Answer ALL the questions in the ANSWER BOOK. 3. Start EACH question on a NEW page in the ANSWER BOOK. 4, Number the answers correctly according to the numbering system used in this question paper. 5. Leave ONE line between two sub questions, for example between QUESTION 2,1 and QUESTION 2.2. 8. You may use a non-programmable calculator. 7. You may use appropriate mathematical instruments. 8. You are advised to use the attached DATA SHEETS. 9, Show ALL formulae and substitutions in ALL catculations. 10. Round off your final numerical answers to a MINIMUM of TWO decimal places. 11. Give'brief motivations, discussions, et cetera where required. 12. Write neatly and legibly.

3 Physical Sciences P2 NcS MDE/September 2016 OUESTION 1 : MULTIPLE-CHOICE QUESTIONS Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Choose the answer and write only the fetter (A—D) next to the question number (1.1 — 1.10) in the ANSWER BOOK , for example, 141 E. 1 Which ONE of the following elements is a non-mineral nutrient? A B Cc D Mg Na Cc Zn ) 12 Which ONE of the following is a catalyst used in the Haber process? Silica gel Iron oxide Vanadium pentoxide Nickel @) 13 Consider the following reaction in equilibrium in a closed container. 4 NHs(g) + 3 O2(g) = 6 H2O (g)+2Ne(g) aH<0 Which ONE of the following changes in the conditions at equilibrium will result in an increase in the value of the equilibrium constant, Ke? A B Cc D Increasing the ammonia concentration Increasing the temperature Decreasing the temperature Adding a platinum catalyst _ 2) 4 Physical Sciences P2 NGS 14 15 1.6 MDE/September 2016 Which type of reaction is illustrated by the following chemica! equation CHeCHCHs + He ~» CHsGH2CHs > Esterification B Addition C Elimination D Substitution (2) A compound with molecular formula CaHleOz could be @ an alcohol (ii) a carboxylic acid (il) an ester Which ONE of the following statements is CORRECT? A (i) only B {i) and (ii) only - CG (i) and (iii) onty D (i) and (iii) only (2) Ammonium sulphate ((NH4)2SOs ) is dissolved in' water. Which ONE of the following statements regarding the solution formed, is CORRECT? A pH=7 B [HaO*]- [OH] < 4X 104 CG [HsO*] > [OH] D [HsO"]<[OH] ~ (2)

& Physical Sciences P2 NCS). MDE/September 2016 Physical Sciencés P2 6 Nes MDE/September 2016 1.7 Consider the reversible reaction represented befow: 1.10 A Zn-Cucell has been operating for some time but the net cell reaction has CHsCOOH(aq) + HSOs(aq) = CHsCOO (aq) + H2SOu(aq) not reached equilibrium, How will an increase in the [Cu?*] affect the emf of @ cell? The strongest base in the reaction above is: A The ert crease CHsCOO" A Obs B : The emf will decrease B CHsCOOH ©. The emf will remain the same , Cc Hsov : « D = The emf will be zero: (2) D HxS0. (2) [20} 18 Which ONE of the following will be changed by the addition of a catalyst? A The ammount of products present at equi 8 The concentration of reactants present at equi Cc The length of time for which the reaction remains at equil D The time it takes to reach eq librium (2) 1.9 Ahypothetical electrochemical cell is constructed by combining two half-celis. The two half-reactions and electrode potentials are given below: ‘eee cemna are TT ON ESSE X(s) + 2e & X*-(aq) . E& = 415V Yt(aq) + eo = Y(s) EB? = -45V Which ONE of the following statements is TRUE? AX (aq) will be oxidised more readily than Y(s) B Y*(aq) will be one of the products formed in the cell reaction C The mass of X will increase when the cell is delivering current D Electrons will flow frorn X (s) to ¥ (s) in the external circuit when the cell is delivering current (2)

Physical Sciences P2 QUESTION 2 (Start on a new page) NCS MDE/September 2016 Six organic compounds (A ~ F) are given in the table below. A OH B =C—CH,—CH, HgC-HC—CH -CHp-CHg HOSC— CHy-CHy-CHy CH c | 3 9 [3] Pentanoic acid CH CH : HC” “cH, E HyC—E-—CHo-CHy F OH 24 Write down the: 2.1.1 Letter of the compound that represents an aldehyde 2.1.2 Structural formula of the functional group of compound D 2.1.3 IUPAC name of compound C 2.1.4 Letter of the compound that represents a tertiary alcohol 2.1.5 Letters of compounds that represents TWO functional isomers 2.1.6 To which homologous series does compound B belong? 2.1.7 is compound B SATURATED or UNSATURATED? Explain the answer. a) (1) (2) q) () (1) (3) 8 Physical Sciences P2 . NCS 2.2 Compound F is preparéd in the laboratory. 2.2.4 How can one quickly establish whether compound F is indeed being formed without performing a chemical test? 2.2.2 Give the IUPAC name:of the alcoho} needed to prepare compound F. QUESTION 8 (Start on a new page) MDE/September 2016 (1) (2) [14] The boiling points of, pentane, 2-methylbutane and 2,2-dimethylpropane were determined during a practical investigation and recorded in the table below, ‘ MOLECULAR MASS BOILING POINT AKANE {g-mot) cc) Pentane 72 36 2-methylbutane 72 28 2,2-dimethylpropane. 72 10 3.1 Define the term boiling point. 3.2 State a suitable hypothests for the investigation. 3.3 Fully explain why pentane has the highest boiling point. 3.4 Which ONE of the three compounds In the table has the highest vapour pressure? Give a reason for the answer 3.5 Write down the: balanced equation for the complete combustion of pentane, (2) (2) (4) (2) £13]

Physical Scionces P2 NCS QUESTION 4 (Start on a new page) 44 MDE/September 2016 The flow diagram shows how two compounds can be formed from 2-bromopentane. NaOH 2-bromopentane (concentrated) A Reaction 1 Reaction 2 Reaction 3 H2S04 (concentrated) Pentan-2-ol Reaction 1 takes place in the presence of concentrated sodium hydroxide, Write down: 4.1.1 An additional reaction condition for this reaction 41.2 The type of reaction of which Reaction 1 is an example 4.1.3 The structural formula of compound A Reaction 2 takes place in the presence of a certain inorganic compound. Write down the: 4144 NAME of the inorganic compound 4.1.5 Type of reaction of which Reaction 2 is an example. Reaction 3 takes place in the presence of concentrated sulphuric acid and heat. 4.1.6 Write down the type of reaction that converts pentan-2-ol to compound A. M) @) @) a) (1) q) Physical Sciences P2 4.2 43 10 NCS MOE/September 2016 A leamer is preparing an ester using ethano! (molecular formula: C2HeO) and methanoie acid (molecular formula: CH202). The:balanced equation’ for the reaction is given below: 4.21 4.2.2 4.23 CatteO + CH2O2 > CsHsO2 + HeO What type of reaction is represented in the equation above? (1) Write down the NAME or FORMULA of the catalyst used in this reaction, {1} When 60 g of impure ethanol fully reacts with excess methanoic acid, 68.9 of CsHeOz is produced. Calculate the percentage purity of ethanol. {6) ‘The ‘structural formula of a polymer is shown below: pedly a Write down the: 4.3.4 4.3.2 STRUCTURAL FORMULA of the monomer that is used to prepare the above polymer, (2) Type of polymerisation reaction (ADDITION or CONDENSATION) that is used to prepare this polymer. (1) 118]

Ww Physical Sciences P2 NCS MDE/September 2016 QUESTION 5 (Start on a new page) A group of leaners use the reaction between zinc and sulphuric acid to investigate one of the factors that affects reaction rate. They add 6,5 g of zinc granules to excess DILUTE sulphuric acid and measure the mass of zinc usec per unit time. The leamers ihen repeat the experiment using the same mass of zinc granules with excess CONCENTRATED sulphuric acid. The balanced equation for the reaction is: 51 5.2 5.3 Zn(s) + HeSOs (aq) > ZnSO« (ag) + He (g) Define the term reaetion rate (in words). Write down the independent variable. The results obtained for the reaction using DILUTE sulphuric acid are represented in the graph below: 0.10 Amount of zine (mol) 0 60 140 time (s) Use the graph to answer the questions below: 5.3.1 Calculate the average rate of the reaction during the first 60 s in gram per second 5.3.2 Compare the rate of reaction at time = 140 s to the rate of reaction at time = 60 s. Choose from GREATER THAN, LESS THAN or EQUAL TO, 2) a) (5) (1) A 0 12 Physical Sciences P2 NcS MDE/September 2016 The Maxwell -Boltzmann distribution curve below represents the number of particles against kinetic energy for the reaction of zinc with DILUTE sulphuric acid. The graph is labelled A. A Number of particles Kinetic energy 54 Redfaw the curve in the: ANSWER BOOK. On the same set of axes, sketch the curve that will be obtained for the reaction wih CONCENTRATED sulphuric acid. Clearly label the curves A and B. . @) 5.5. Use the collision theory to explain how an increase in the concentration of ‘sulphuric acid will affect the rate of reaction 3) [14]

13 Physical Sciences P2 NCS QUESTION 6 (Start on a new page) 2-moles of carbon dioxide (CO2), 1 mole of hydrogen (Hz) and 0,2 mole of carbon monoxide (CO) are sealed in a 2 dm® container. The reaction reaches equilibrium at 1 000°C. The balanced equation for the reaction is: CO2(g) + Hol(g) 2 CO(g) + HeO(g) On analysis of the eq vapour is 0,362 mol.dm*, rium mixture , it is found that the concentration of the water 6.1 Calculate the equilibrium constant (Ke) at 1 000°C for this reaction, 62 Itis found that at a temperature of 1 500°C, the value of the equilibrium constant calculated in QUESTION 6.1, decreases, Is the forward reaction EXOTHERMIC or ENDOTHERMIC? Fully explain how you arrived at the answer. 6.3 An additional 0,277 mole of water vapour is pumped into the sealed 2 dm? container. The volume of the container stays the same, Equilibrium is reinstated at 1 000°C. 6.3.1. How is the concentration of the CO (g) affected? Choose from INCREASES, DECREASES or STAYS THE SAME. 6.3.2 Use Le Chatelier’s Principle to explain the answer in QUESTION 6.3.1. MDE/September 2016 (4) (1) (3) [15] 14 Physical Sciences P2 NCS MDE/September 2016 QUESTION 7 (Start on a new page): 71 ‘Sulphuric acid is a strong diprotic acid. Define the term strong acid (2) 7.2 HSO« can behave either as an acid or a base. 7.2.1 Give the term that is used for substances such as HSO«, (1) 7.2.2 Write down the balanced equation for the reaction of HSO« with H2O in which HSO¢ :acts as an/acid, (2) 7.3 Calculate the pH of a Mg(OH)z solution with a concentration of 0,2 mol-dms, Assume that Mg(OH)2 dissociates completely. (4) 7.4 — Vinegar is (3 — 5)%.ethanoic acid by mass, with the remai ig mass being a solvent. To determine the percentage of ethanoic acid in a vinegar sample, it is titrated against a NaOH solution. The balanced equation for the reaction is: CHsCOOH(aq) + NaOH(aq) + CHsCOONa(aq) + H20() Ai0g sample of vinegar is titrated against a 0,309 mot-dm? NaOH solution. 19,57 cm? of NaOH is required to reach end point. 7.4.1 Determine the mass af the ethanoic acid in the 10 g sample. (5) 7.4.2 Show by calculation that the percentage of the ethanoic acid is within the given range. (2) The table below provides information of three different indicators: COLOUR CHANGE INDICATOR COLOUR CHANGE pH RANGE Methyl orange: Red — yellow 3,0-4,4 Bromothymo! blue Yellow — blue 6,0-7,.6 Phenolphthalein Colourless - pink 82-98 7.4.3 Use the information in the table above and choose a suitable indicator to use in the above titration, Give a reason for the answer. (2) 7.4.4 The ethanoate ions that form during the reaction, react with water according to the balanced equation below: CHsCOO: (aq) + H20 (@) & CHsCOOH (aq) + OH" (aq) Write down the name of the process described by the underlined phrase, 4) [19]

15 Physical Sciences P2 NCS MDE/September 2016 QUESTION 8 (Start on a new page) The two half-cells, Fe(s) | Fe®*{aq) and O2(g) | H2O(¢) in acid solution, are used to set up an electrochemical cell. The cell operates under standard con 8.41 8.2 8.3 8.4 85 8.6 Write down TWO standard conditions, other than temperature, which apply to this electrochemical cell. Give TWO reasons, besides being a solid, why platinum is a suitable electrode in the above cell. Write down the hatf-reaction that takes place at the cathode of this cel Write down the cell notation of this cell. Calculate the initial emf of this cell. ‘The reading of the voltmeter becomes zero after using the cell for several hours. Give a reason for this reading by referring to the cell reaction. (2) @) 2) (3) (4) M) [14] 16 Physical Sciences P2 NCS MDE/September 2018 QUESTION 9 (start on a new page} The diagram below show an electrolytic cell used to coat a nickel coin with silver. 9.4 9.2 9.3 9.4 9.5 2.6 POWER, [isouree | Electrolyte Electrodo Nickel coin Which electrode (anode or cathode) does the nickel coin represent? Define the term electrolyte. Write down the NAME or FORMULA of a suitable electrolyte used in this cell. Write down the haif-reaction that takes place on the surface of the nickel coin. How will the concentration of the electrolyte change during electrolysis? Choose from INCREASE, DECREASE or REMAINS THE SAME. Explain the answer in QUESTION 9.5. 4) @) Q) @) q) ) [9]

Physical Sciences P2 QUESTION 10 (Start on a new page) 17 NCS * MDE/Septamber 2016 The diagram below illustrates the processes used to manufacture a certain fertilizer. Study the diagram and answer the questions that follow. Fractional distillation of liquid air | Substance A 10.1.4 10.4.2 10.1.3 10.1.4 10.1.5 10.14.68 Process 1 Substance B Fertilizer C Process 2: Step 1: product NO Step 2: product NOz Step 3: product HNOs NAME or FORMULA of substance A that is obtained by the fractional distillation of liquid air. Balanced equation for the reaction that occurs in Process 1, NAME of the substance B that forms as a result of Process 1, NAME of process 2. NAME or FORMULA of fertiliser C. NAME of the process that occurs when excess fertiliser C runs into the livers, (1) @) 0) q) Q) (1) ARDRRAAETT EAD Et 18 Physical Sciences P2 NCS MDE/September 2016. 10.2 A farmer has two bags of fertiliser marked A and B, as shown below. 10.2.1 The farmer wants to grow tomatoes and fruits. Which ONE of these fertilisers must the farmer use, write down A or B. Give a reason for the answer. (2) 10.2.2 Calculate the mass of potassium in bag B. (4) (14) TOTAL MARKS: 150

Bloctronegattity | Elektronegatiwiteit. ETL ELE “Atomic number: ‘Atoomgetal o * 1" Symbol CU | Simboo! “Approximate felative atomic 1 enaderde.relatiewe atoommassa > S-TABLE 3: THE PERIODIC TABLE OF ELEMENTS" 850°) fE PERIODIEKE TABEL VAN ELEMENTE: ~:~ Zd sseoue|og feajskug 24 3.25 v2 Cr i2Ma bao] 5S aan 43 I = Mo/2.Te 75 86 oRe Rn £486". S 67. 71 “Ho Lu 165 175 99°] 100- [101 | 402.) 103 Md.) No. | br. Za seouelg jeoyshyg SON et 910% saquieidegyaqw 9tog sequaydeg aN

_, MDE/September 2016 Physical Sclences P2 NCS MDE/September 2016 TABLE 4B: STANDARD REDUCTION POTENTIALS _TABEL 45: STANDAARD-REDUKSIEPOTENSIALE e : Half-reactions/Halfreaksies ET) F 3.05; 2,93, 1 R92 - = 2,80. 192,69 ~ 2,87: Ps 2,71 2 2,36 71,66. =4148; “9,91 0,83. 50.76: = 0:74 20,44, 0,41 “0,40 NDARD REDUCTION POTENTIALS: INDAARD-REDUKSIEPOTENSIALE FREE Te Boe 20H", 8 lity!Toenemende reduserende vera increasing oxidising ability/ Toenemende oksiderende vermoé NOx(g) + Hz0. " Increasing reducing abi . . + 0,85 NOG #4H"+ go7-*, + 0,96. Eo Brg(t) 4 3a £4,07. : SPR eae ep #4,20. : : Mn? ¥ 2420} 44,23, : OZONE Bl a3. 2 2OP° 470 | |. oe 133 BOE: a Mn?t+ aH20°") + 4,54 Figg) +26"