Physical Sciences Grade 12 P2 Free State Mock 2025 QP

education Department of Education FREE STATE PROVINCE PREPARATORY EXAMINATION GRADE 12 PHYSICAL SCIENCES P2 (CHEMISTRY) SEPTEMBER 2025 MARKS: 150 TIME: 3 HOURS This question paper consists of 14 pages and 4 data sheets. Copyright reserved Please turn over

FS/September 2025 INSTRUCTIONS AND INFORMATION 1. 10. Ts 12. Write your name and other applicable information in the appropriate spaces on the ANSWER BOOK. The question paper consists of NINE questions. Answer ALL the questions in the ANSWER BOOK. Start EACH question on a NEW page in the ANSWER BOOK. Number the answers correctly according to the numbering system used in this question paper. Leave ONE line between two subquestions, e.g. between QUESTION 3.1 and QUESTION 3.2. You may use a non-programmabie pocket calculator. You may use appropriate mathematical instruments. Show ALL formulae and substitutions in ALL calculations. Round off your FINAL numerical answers to a minimum of TWO decimal places where necessary. Give brief motivations, discussions, etc. where required. You are advised to use the attached DATA SHEETS. Write neatly and legibly. Copyright reserved Please turn over

FS/September 2025 QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Each question has only ONE correct answer. Choose the answer and write only the letter (A-D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, for example, 1.11 E. 1.1. Which ONE of the following is an unsaturated hydrocarbon? A C4Hi0 B CH3(CH)2CH3 Cc CH3(CH2)2CH3 D CH3CH2CH2CH3 (2) 1.2 Consider the organic molecule below. CaHsO2 Its correct IUPAC name is ... A butan-2-ol. B butanoic acid. Cc methyl butanoate. D ethyl butanoate. (2) 1.3. Consider the organic structure below. ll CH3—C—O—CH; The IUPAC name of its FUNCTIONAL ISOMER is ... A methyl ethanoate. propanoic acid. ethyl methanoate. 0 aO DB ethanoic acid. (2) Copyright reserved Please turn over

FS/September 2025 1.4 The reaction of copper(Il) carbonate with EXCESS dilute hydrochloric acid is used to investigate the rate of reaction. The balanced equation for this reaction iS! CuCOs(s) + 2HC£(aq) > CuCta(aq) + H20(2) + CO2(g) The rate of reaction can experimentally be measured by measuring the ... A B Cc D hydrochloric acid used. amount of water formed per time. volume of COz2 produced per time. temperature of the mixture. (2) 1.5 Which ONE of the following statements concerning equilibrium is NOT correct? A B Equilibrium is reached in a closed system. At equilibrium, the concentration of reactants and products is constant. At equilibrium, the concentration of reactants and products is not necessarily the same. At equilibrium, the concentration of reactants is equal to the concentration of products. (2) 1.6 Write down the conjugate base of the following acid: HCl04 (2) Copyright reserved Please turn over

FS/September 2025 1.7 The role of an indicator during a titration is to ... A show the color of the base. B standardise the solution. Cc show the color of the acid. D identify the endpoint. (2) 1.8 | Which statement is CORRECT for a Zn-Cu galvanic cell that operates under standard conditions? A The concentration of the Zn** ions in the zinc half-cell gradually decreases. B The concentration of the Cu?* ions in the copper half-cell gradually increases. [e} The intensity of the colour of the electrolyte in the copper half-cell gradually decreases. D Negative ions migrate from the zinc half-cell to the copper half-cell. (2) 1.9 What is the energy convertion in an electrolytic cell? A Electrical to chemical B Chemical to electrical Cc Electrical to mechanical D Chemical to mechanical (2) 1.10 During the purification of copper, the ... A impure copper is the positive electrode. B impure copper is connected to the cathode. Cc pure copper is the positive electrode. D pure copper is connected to the anode. (2) [20] Copyright reserved Please turn over

FS/September 2025 QUESTION 2 (Start on a new page.) The letters A to F in the table below represent organic compounds. A CHsCOCH(CHs)2 B 3,3-dimethylhexane H i"! H oy on H | H H—C—C—C=0O ato-# i ce | | i . H—¢C—H H—C——C——C—H | | | \ H—C—H H H | i i H H E C2H402 F Propan-1-ol 2.1. Write down the letter(s) representing: 2.1.1 An aldehyde (1) 2.1.2 Functional isomers (1) 2.1.3. Acarboxylic acid (1) 2.2 Write down the general formula of the homologous series to which compound B belongs. (2) 2.3. For compound C, write down the: 2.3.1 Letter of the molecule that is its structural isomer (1) 2.3.2 Type of structural isomerism named in QUESTION 2.2.1 (1) 2.3.3 IUPAC name (3) 2.4 For compound A, write down the structural formula of its chain isomer. (3) 2.5 Compounds E and F react to form an organic molecule. For this reaction, write down the: 2.5.1 Type of reaction (1) 2.5.2 NAME or FORMULA of the catalyst used (1) 2.5.3, IUPAC name of the ORGANIC product formed (2) [17] Copyright reserved Please turn over

FS/September 2025 QUESTION 3 (Start on a new page.) The boiling points of four organic compounds are shown in the table below. COMPOUND eon your ——~ A_ | CH3CH2COOH 141,1 74 B_ | CHs(CH2)30H tees 74 C | CHsCH(CH3)CH20H 108 74 D | CHsCOCH2CH3 79,6 72 3.1. Define the term boiling point. (2) 3.2 | Compounds C's boiling point is lower than that of compound B. Fully explain. (3) 3.3. Consider compounds A, B and D. 3.3.1 Predict the value of the boiling point of compound B in °C. Choose from: 145 141 117,7 (1) 3.3.2 Fully explain the answer to QUESTION 3.3.1. (6) 3.4. The vapour pressures of three straight-chained alkanes E, F and G are shown below. COMPOUND VAPOUR PRESSURE at 25 °C (kPa) E C2He 4 187 CsHs 1 050 G C4Hi0 250 3.4.1 Write the IUPAC NAME of the compound with the highest BOILING POINT. (2) 3.4.2 Fully explain the trend in the vapour pressure from compound E to compound G. (3) [17] Copyright reserved Please turn over

QUESTION 4 (Start on a new page.) FS/September 2025 The flow diagram below shows a number of organic reactions. Reaction | is CATALYTIC CRACKING. Compound Q Reaction | CH3CH2CH3 Reaction Il] Oz Compound R Reaction III} HBr Compound S Inorganic Compound T Compound R Reaction V_ }H2SOz Alcohol Reaction IV 4.1. Define the term cracking. 4.2 Consider reaction Il. NaOH Compound U CsH7Br (2) 4.2.1. What type of reaction is it? Choose from ENDOTHERMIC or EXOTHERMIC. (1) 4.2.2 Using MOLECULAR FORMULAE, write down the balanced chemical equation. 4.2.3. Write down the NAME of compound S. Copyright reserved (3) (1) Please turn over

FS/September 2025 4.3. In reaction Ill, compound R reacts with HBr to form compound U, which is a major product with molecular formula C3H7Br. For reaction Ill, write down: 4.3.1 The type of reaction (1) 4.3.2 ONE reaction condition (1) 4.3.3. The IUPAC name of compound U (2) 4.4 Forreaction IV, write down the: 4.4.1 Structural formula of the alcohol formed (2) 4.4.2 Type of reaction (1) 4.5 For reaction V, write down the: 4.5.1 Type of elimination reaction (1) 4.5.2 IUPAC name of compound R (2) [17] Copyright reserved Please turn over

FS/September 2025 QUESTION 5 (Start on a new page.) A factor influencing the rate of a chemical reaction is investigated by conducting two experiments, 1 and 2, in which the following reaction occurs: Mg(s) + 2HCf(aq) > MgC£2(aq) + H2(g) In both experiments, the same mass of magnesium(Mg) is added to an EXCESS hydrochloric acid(HCé) solution with the same concentration in an open flask at STP. The graph below shows the changes in the amount of gas collected during the reaction in experiments 1 and 2. A no] 8 50 3 oO aa =~ i) o —E 3 $s 5.1. Write down the name of the apparatus used for collecting the gas. (1) 5.2 Define the term rate of reaction. (2) 5.3. Calculate the average rate (in dm°-s™) at which hydrogen is produced in experiment 1. (3) 5.4 If 2 g of magnesium was used for this investigation, calculate the percentage purity of the magnesium. (7) Copyright reserved Please turn over

FS/September 2025 5.5 The Maxwell-Boltzmann distribution curves for the reaction in experiment 1 and 2 are given below. Number of particles Kinetic energy 5.5.1 Which factor affecting the reaction rate is being investigated? (1) 5.5.2 Which curve (A or B) represents the reaction in experiment 2? (1) 5.5.3 Explain the answer to QUESTION 5.5.2 by referring to the collision theory. (2) [17] Copyright reserved Please turn over

FS/September 2025 QUESTION 6 (Start on a new page.) Carbon, C, reacts with an unknown amount of carbon dioxide, COz, in a sealed 2 dm? container, at a temperature T. The equilibrium constant, Ke, at this temperature is 0,2. The balanced equation for the reaction is: CO2(g) + C(s) = 2CO(g) At equilibrium, the concentration of carbon monoxide, CO, is found to be 0,04 mol-dm*. 6.1. Can the above situation be referred to as a closed system? Write down YES or NO. (1) 6.2 Explain the answer to QUESTION 6.1. (2) 6.3. Calculate the initial moles of CO2 used. (8) 6.4 Is the yield of carbon monoxide HIGH or LOW? (1) 6.5 Explain the answer to QUESTION 6.4. (2) 6.6 When the temperature is decreased, the yield of CO decreases. 6.6.1 Is the forward reaction EXOTHERMIC or ENDOTHERMIC? (1) 6.6.2 Use Le Chatelier's principle to explain the answer to QUESTION 6.6.1. (2) 6.7. Drawa graph of potential energy (kJ-mol™') versus the reaction coordinate for the reverse reaction. Indicate the following on the graph: e Activation energy e Heat of reaction (AH) e Energy of reactants and products Write down the actual formulae of reactants and products (COz, C and CO) on the graph as labels of these energies. (4) [21] Copyright reserved Please turn over

FS/September 2025 QUESTION 7 (Start on a new page.) 7.1 C2 Copyright reserved Astandard solution of NaOH with a pH of 13,4 is used to neutralise 3,125 cm® of a 0,4 mol-dm*® solution of H2SO4. The balanced chemical equation of the reaction is: H2SO4{aq) + 2NaOH{aq) — NazSOa(aq) + 2H20(£) 7.1.1 Define the term standard solution. 7.1.2 Is NaOH a strong or weak base? 7.1.3 Explain the answer to QUESTION 7.1.2. 7.1.4 Calculate the concentration of the NaOH solution. 7.1.5 Calculate the volume of the NaOH needed to neutralise the acid. A laboratory technician neutralises an accidental spill by pouring 5 g of baking soda (NaHCOs) on a 50 cm? hydrochloric acid solution of concentration 1,6 mol-dms, HCt(aq) + NaHCO3(s) + NaCt(aq) + CO2(g) + H20(£) Calculate the pH of the final solution. Assume the volume remains constant. (2) (1) (2) (5) (5) (7) [22] Please turn over

FS/September 2025 QUESTION 8 (Start on a new page.) A learner has the following reagents to construct an operational GALVANIC CELL under standard conditions: Lead, Pb, lead nitrate, Pb(NOs)2, silver, Ag, silver nitrate, AQgNOs, and iron(IIl) chloride, FeCf3 8.1 8.2 8.3 8.4 Define the term electrolyte. (2) Using ONLY the reagents given above, write down the cell notation of the operational galvanic cell. (3) Write down the NAME or FORMULA of a substance that can be used in the salt bridge. (2) Calculate the EMF of the above cell. (4) [11] QUESTION 9 (Start on a new page.) The simplified diagram below represents the electrolysis of a copper(II) chloride solution. Cle 9.1. Write down ONE safety measure which must be taken during the above process. (1) 9.2 Explain why the safety measure in QUESTION 9.1 is necessary. (2) 9.3 In what direction are the electrons moving? Choose from P to Q or Qto P. (1) 9.4 | Write down the NAME of the substance that forms at electrode P. (1) 9.5 Write down the balanced net ionic equation for the reaction. (3) [8] TOTAL: 150 Copyright reserved

FS/September 2025 DATA FOR PHYSICAL SCIENCES GRADE 12 PAPER 2 (CHEMISTRY) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12 VRAESTEL 2 (CHEMIE) TABLE 1: PHYSICAL CONSTANTS / TABEL 1: FISIESE KONSTANTES NAME / NAAM SYMBOL / SIMBOOL VALUE / WAARDE TABLE 2: FORMULAE / TABEL 2: FORMULES m N ma nN, n oy OR/OF ny m “MV ae pH=-log(H,0"] Ky=[H3O*][OH']=1*10"* atby 298 K @ 8 8 Ecei=Ecathode"Eanode OR 8 _-@ 8 Ece=Ereduction~Eoxidation OR 8 6 8 Ecett=E oxidising agent"Eredusing agent OF OR 8 _-6 8 Ese1=Ekatode"Eanode 8 _ 6 8 Ese1=Ereduksie"Eoksidasie 8 8 8 Ese1=E oksideermiddel"Ereduseermiddel Copyright reserved Please turn over

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Increasing oxidising ability / Toenemende oksiderende vermoé Copyright reserved TABLE 4A: STANDARD REDUCTION POTENTIALS TABEL 4A: STANDAARD-REDUKSIEPOTENSIALE Half-reactions / Halfreaksies 59 (V) F2(g) + 2e° 2F + 2,87 Co%*+e = Co* + 1,81 H202 + 2H*+2e° = 2H20 41,77 MnO, +8H*+S5e = Mn** +4H,O + 1,51 Ch(g)+2e = 2Ct + 1,36 Cr07 +14H*+6e = 2Cr*++7H20 + 1,33 O.(g)+4H*+4e = 2H20 + 1,23 MnO2+4H*+2e = Mn** +2H20 44,23) Ptt+2e = Pt + 1,20 Br(t)+2e = 2Br +1,07 NO, +4H*+3e = NO(g)+2H,0 + 0,96 Hg**+2e = Hg(e) +0,85 Ag +e Ag + 0,80 NO, +2H*+e@ = NO2(g)+H0 + 0,80 Fe*+o = Fe* +0,77 Og) +2H*+2e = HO2 +0,68 k+2e = 2 + 0,54 Cutte = Cu + 0,52 SO.+4H'+4e = $+2H,0 +0,45 2H20+0O2+4e = 40H + 0,40 Cu%*+2e = Cu + 0,34 SO7 +4H'+2e = SOx(g)+2H20| +0,17 Cu%*+e = Cut +0,16 Sn#*+2e = Sn +0,15 S+2H*+2e = H2S(g) +0,14 2H*+2e- = Hag) 0,00 Fe*+3e = Fe — 0,06 Pb?* + 2e- Pb -0,13 Sn?*+2e = Sn — 0,14 Ni?*+2e = Ni - 0,27 Co*%*+2e = Co — 0,28 Cd**+2e = Cd —0,40 Cette = Crt — 0,41 Fe*+2e = Fe — 0,44 Cr++3e = Cr — 0,74 Zn*+2e = Zn — 0,76 2H20 + 2e = = H2(g) + 20H” — 0,83 Cr++2e = Cr —0,91 Mn’*+2e = Mn — 1,18 ABbt+3e = Al — 1,66 Mg**+2e = Mg — 2,36 Nat*+e = Na — 2,71 Ca**+2e = Ca — 2,87 Srt+2e = Sr — 2,89 Ba**+2e = Ba — 2,90 Cs*t+e = Cs - 2,92 Kt+e = K — 2,93 Litre Li —3,05 FS/September 2025 Increasing reducing ability / Toenemende reduserende vermoé Please turn over

Increasing oxidising ability / Toenemende oksiderende vermoé FS/September 2025 TABLE 4B: STANDARD REDUCTION POTENTIALS TABEL 4B: STANDAARD-REDUKSIEPOTENSIALE Half-reactions / Halfreaksies E® (v) litte = Li ~ 3,05 Kte = K — 2,93 Cs*+e = Cs — 2,92 Ba**+2e = Ba — 2,90 Srt+2e = Sr — 2,89 Ca*%*+2e = Ca — 2,87 Nat+e = Na - 2,71 Mg?*+2e = Mg — 2,36 AG++3e = AL ~ 1,66 Mn?*+2e- = Mn - 1,18 Cr++2e = Cr - 0,91 2H,0+2e = He{g)+20H | -0,83 * Zn*+2e = Zn — 0,76 ® crt+3e = Cr - 0,74 2 Fe +20 = Fe ~ 0,44 S Cette = Crt - 0,41 ® Cd*+2e = Cd - 0,40 2 Co*+2e = Co — 0,28 § NP? +2e = Ni ~ 0,27 8 Sn +2e = Sn — 0,14 BS Pb +2e = Pb -0,13 o Fe +3e = Fe — 0,06 Hy 2H*+2e = Hag) 0,00 & S+2H'+2e = HS(g) + 0,14 2 Sn*¥+2e = Sn? +0,15 e Cu#+e = Cut +0,16 ~ $02 +4H'+2e = $0,(g)+2H.0| +0,17 2 Cu2++2e- = Cu + 0,34 2 2H20+O2+4e = 40H + 0,40 > SO,+4H*+4e = S+2H,0 + 0,45 3 Cu’+e = Cu + 0,52 3 b+2e = 2b +0,54 £ O2(g)+2H*+2e = H2O2 + 0,68 2 Fet++e = Fe% +0,77 8 NO, +2H*+e = NOAg)+HO | +0,80 5 Ag'te = Ag + 0,80 = Hg*+2e = Hg(t) + 0,85 NO3 +4H*+3e = NO(g)+2H,O | +0,96 Bro(t)+2e = 2Br + 1,07 Pt=+2e = Pt + 1,20 MnO2+4H*+2e = Mn? +2H20 + 1,23 O.(g)+4H*+4e = 2H20 + 1,23 CrO? +14H*+6e = 2Cr++7H,O | +1,33 Ch(g)+2e = 2Ct + 1,36 MnO, +8H*+5e = Mn? +4H,0 +1,51