Physical Sciences Grade 12 P2 Limpopo June 2024 QP

Downloaded from hlayiso.com LIMPOPO PROVINCIAL GOVERNMENT REPUBLIC OF SOUTH AFRICA DEPARTMENT OF EDUCATION NATIONAL SENIOR CERTIFICATE PHYSICAL SCIENCES: CHEMISTRY P2 JUNE 2024 TOTAL: 150 TIME: 3 HOURS AUIMIIAM This question paper consists of 13 pages, 1 graph paper and 4 data sheets. Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 2 LimpopoDoE/June 2024 NSC INSTRUCTIONS AND INFORMATION . 1. oe oa NN 11. 12. Write your name and other applicable information in the appropriate spaces on the ANSWER BOOK. The question paper consists of SEVEN 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 sub-questions, for example between QUESTION 3.1 and QUESTION 3.2. Non-programmable pocket calculators may be used. Appropriate mathematical instruments may be used. You are advised to use the attached DATA SHEETS. 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, et cetera where required. Write neatly and legibly. Copyright reserved Please tum over

Downloaded from hlayiso.com Physical Sciences P2 - 3 LimpopoDoE/June 2024 NSC QUESTION 1: MULTIPLE-CHOICE QUESTIONS » .. Four options are provided as possible answers to the following questions. Each Ei question has only ONE correct answer. Choose the answer and write only the letter (A—D) next to the question number (1.1 — 1.10) in your ANSWER BOOK, for example 1.11 E. 1.1. CnHan+1OH is the GENERAL FORMULA for: A Alkanes B Aldehydes Cc Alcohols D Alkenes (2) 1.2 The functional group of carboxylic acids is: ome, A —coo— 4 - B —COOH C -OH D —CHO (2) 1.3. Consider the following structural formula of an organic compound. H : eg akin H on ae ee i H—C—H y The IUPAC name of this compound is: A 2-methyl-3-ethylprop-1-ene B 2-methyl-1-ethylprop-1-ene Cc 4-methylpent-3-ene D 2-methylpent-2-ene (2) * Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 4 LimpopoDoE/June 2024 NSC 4.4. Which ONE of the following represents an acid-catalysed condensation reaction? A Hydration B Esterification Cc Hydrolysis D Dehydration (2) 1.5 50cm%ofa0,1 mol.dm* solution of hydrochloric acid is poured on to 5g of granulated zinc which is inside a glass beaker at room temperature. Which one of the following factors will not increase the initial rate of the reaction? A Grinding the granulated zinc into powder. B Using 30 cm® of a 0,2 mol.dm* hydrochloric acid at room temperature. Cc Increasing the temperature of the acid solution to 50 °C D Using 100 cm’ of a 0,1 mol.dm* solution of hydrochloric acid at room temperature. (2) 1.6 The reaction represented below reaches equilibrium in a closed container. CHa(g) + H20(g) = CO(g) + 3H2(9) AH > 0 Which ONE of the following changes will increase the yield of Ha(g)? A Add a catalyst. Decrease pressure by increasing the volume. Decrease the temperature. 0 aQa FD Increase pressure by decreasing the volume. (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 5 LimpopoDoE/June 2024 NSC 1.7 Consider the reaction: 2H20(t) = H30*(aq) + OH(aq) The equilibrium constant for this reaction at 25 °C is 10-'4. At 60 °C the equilibrium constant for this reaction is 10-3. From the above information one can conclude that this reaction at 60 °C ... A is an exothermic reaction. has a high product yield. B [o} the concentration of H3O* decreases. D the concentration of products does not change. (2) 1.8 | Asaturated solution of NaC? in water is prepared at 50 °C. The equation for this equilibrium is: NaCt(s) = Na*(aq) + Ce(aq) AH>0 Which ONE of the following changes will cause more NaC{(s) to form? A Add dilute hydrochloric acid. B Add a catalyst at constant temperature. Cc Increase the pressure on the solution. D Decrease the temperature. (2) 1.9 | Which ONE of the following is TRUE if the ACIDITY of a solutions increases. [H30*] pH A Increase : Increase B Increase Decrease Cc Decrease Increase D Decrease Decrease (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 6 LimpopoDoE/June 2024 NSC 1.10 The potential energy graph for a hypothetical chemical reaction is shown below. ry 6 E z Products > 2 o c Cy = s & r) a Course of reaction What type of reaction takes place and what are the correct methods to calculate AH and Ea? TYPE OF REACTION AH Ea A Exothermic b-a c-b B Endothermic b-a c-a Cc Endothermic a-b a-c D Exothermic a-b b-c 7 (2) [20] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 : 7 NSC LimpopoDoE/June 2024 QUESTION 2 (Start on a new page.) The letters A to F in the table below represent six organic compounds. A Butanal B CH2CHe2 tt eae OSCR Py ory H H OH Br H H H H H-C-H Ho| 4 E H-C—C—C-H F Ethyl ethanoate H | oH H-C-H H Use the information in the table to answer the questions that follow. 24 Ze 2.3 2.4 2.5 2.6 Write down the letter(s) representing: 2.1.1. Acompound with the general formula CrH2n+2 2.1.2 Aketone 2.1.3 An aldehyde 2.1.4 An unsaturated hydrocarbon For compound F, write down the: 2.2.1 Structure of the functional group to which it belongs. 2.2.2 IUPAC name of the acid and an alcohol needed to prepare F. 2.2.3 Balanced equation, using structural formulas, for the formation of F. Write down the IUPAC name of: 2.3.1. Compound C 2.3.2 Compound D Write down the condensed structural formula for C. Write down the structural formula of: 2.5.1 Achain isomer of compound E 2.5.2 Compound F Write down the NAME or FORMULA of each product formed during the complete combustion of compound E. Copyright reserved (1) (1) (1) (1) (2) (2) (5) (2) (2) (2) (2) (2) (2) Please turn over

Downloaded from hlayiso.com Physical Sciences P2 2.7 8 LimpopoDoE/June 2024 NSC compound B in a test tube. A few drops of fresh reddish-brown bromine water are added to 2.7.1 Describe what will be observed in the test tube. (1) 2.7.2 Use structural formulas to write a balanced equation for the reaction QUESTION 3 (Start on a new page.) that takes place in the test tube. (4) [30] Two different experiments are performed to determine the boiling points of organic compounds of different homologous series under the same conditions. The results obtained are shown in the table below. Experiment Organic compound Relative Molecular Boiling Point Mass (°c) P CHsF -78,3 i Q CH3Ct -241 R CH3Br 3,7 X CH3(CH2)2COOH 88,1 163 i] Y CHs(CH2)sCH2OH 88,1 137 Z CH3(CH2)3CHO 88,1 103 3.1. Define the term homologous series. (2) 3.2 Give one word for: The temperature at which the vapour pressure ofa substance equals the atmospheric pressure. (1) 3.3. Write down the independent variable for Experiment I. (1) 3.4. From the table, write down the IUPAC names of TWO compounds that would be gases at —20°C. (2) 3.5. Describe the trend in the boiling points of the compounds in Experiment 1. (2) 3.6 Explain the trend in QUESTION 3.5 above. Refers to INTERMOLECULAR FORCES and ENERGY needed in you explanation. (3) Use the data for Experiment II to answer QUESTIONS 3.7 — 3.9. 3.7. Formulate an investigative question for the experiment. (2) 3.8 NAME avariable that must be kept constant in this experiment. (1) 3.9 State the conclusion that can:be drawn from the results of this experiment. (2) Copyright reserved [16] Please turn over

Downloaded from hlayiso.com Physical Sciences P2 9 LimpopoDoE/June 2024 NSC QUESTION 4 (Start on a new page.) The flow diagram below shows how alcohols can react to form other organic compounds. Compound X Secondary 7 >| Alcohol Reaction A CH3CHCICH; +Concentrated KOH Reaction C Reaction B Reaction D | + Hz Alkane 4.1 Write down the type of reaction represented by reaction: 4.1.1 A (1) 4.12 B (1) 4.13 D (1) 4.2 In reaction B, compound X is converted to an alkene. Write down the: 4.2.1 IUPAC name of compound X. (2) 4.2.2 Balanced equation for the reaction B, using structural formulae. (4) 4.3. Reaction C takes place in the presence of a strong acid. 4.3.1 Explain the term secondary alcohol. (2) 4.3.2 Write down the IUPAC name of the alcohol used. (2) [13] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 10 LimpopoDoE/June 2024 NSC QUESTION 5 (Start on a new page.) NOTE: The graph for QUESTION 5.3.2 must be drawn on the GRAPH SHEET attached at the end of the QUESTION PAPER. Methanol and hydrochloric acid react according to the following balanced equation: CH30H (aq) + HC&(aq) — CHsC@ (aq) + H20 (2) 5.1. Give two ways how the rate of this reaction can be increased. (2) 5.2 Define the term reaction rate. (2) 5.3 The rate of the reaction between methanol and hydrochloric acid is investigated. The concentration of HCf (aq) was measured at different time intervals. The following results were obtained: TIME (minutes) HC@ consentration (mol.dm*) 0 1,90 15 1,45 55 1,10 100 0,85 215 : 0,60 5.3.1 Calculate the average reaction rate, in (mol-dm?)-min™ during the first 15 minutes. (3) 5.3.2 Use the data in the table to draw a graph of concentration versus time on the attached graph sheet. NOTE: The graph is not a straight line. (ATTACH THIS GRAPH SHEET TO YOUR ANSWER BOOK.) (3) 5.3.3 From the graph, determine the concentration of HCE (aq) at the 40" minute. (2) 5.3.4 Use the collision theory to explain why the reaction rate decreases with time. Assume that the temperature remains constant. (3) 5.3.5 Calculate the mass of CHsCf (aq) in the flask at the 215" minute. The volume of the reagents remains 60 cm’ during the reaction. (5) [20] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 ’ 1 LimpopoDoE/June 2024 NSC QUESTION 6 (Start on a new page.) Many industries in South Africa rely on sulphuric acid and the compounds it is used to produce. The large-scale production of sulphuric acid involves the following equilibrium: 6.1 6.2 6.3 2S0O2 (g) + O2(g) = 2SO3(g) AH<0 State Le Chatelier’s Principle. (2) How will each of the following changes affect the yield of SO3 (g) at equilibrium? ‘ Choose from INCREASES, DECREASES and REMAINS THE SAME. Explain by using Le Chatelier’s Principle. 6.2.1 An increase in pressure by decreasing the volume. (3) 6.2.2 An increase in temperature. (3) In a laboratory experiment, 5 mol SO2 and 3 mol O2 are sealed in a 2 dm* container. The graph below shows how the number of moles of reactants and products change over a 15 minute period. 5 10 12. Time (min) 6.3.1 After 5 minutes, the concentration of oxygen gas in the container was found to be 0,9 mol.dm*. Calculate the value of Kc between 5 and 10 minutes. (7) 6.3.2 What disturbance occurred at t = 10 minutes? (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 12 LimpopoDoE/June 2024 NSC 6.3.3 How does the disturbance at t = 10 minutes affect the value of Kc? Write down only INCREASES or DECREASES or NO CHANGE. (2) After 12 minutes the following sketch graph of reaction rate against time is obtained for the equilibrium mixture. t _--——- Forward Reaction Reverse Reaction a (es = a s o — = ~ 42 15 Time (minutes) 6.3.4. Explain the term dynamic equilibrium. (2) 6.3.5 Acatalyst is added to the equilibrium mixture at time 15 minutes. Redraw the graph above in your ANSWER BOOK. On the same set of axes, complete the graph showing the effect of the catalyst on the reaction rates. (2) [23] QUESTION 7 (Start on a new page.) 7.1. Hydrochloric acid is a highly corrosive strong acid with many industrial uses. When 0,02 dm? of sodium hydroxide is added to 0,15 dm’ of diluted hydrochloric acid of concentration 0,03 mol.dm’, the pH of the mixture changes to 4. 7.1.1 Give a reason why hydrochloric acid is classified as a strong acid. (2) — 7.1.2 Write down a balanced chemical equation to show the dissociation of HC¢ in water. (3) 7.1.3 Will the final mixture be acidic or basic? Give a reason for your answer by referring to the pH of the mixture. (2) 7.1.4 Calculate the final concentration of the H* ion.in the mixture. (3) 7.1.5 Calculate the original concentration of the sodium hydroxide solution. (6) Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 13 7.2 Calcium carbonate solutions provide living organisms with the substance NSC LimpopoDoE/June 2024 they need to grow their protective shells and skeletons. For example, eggshells are composed of calcium carbonate. Grade 12 learners decide to calculate the percentage calcium carbonate in eggshells at STP. They take 5 g of crushed eggshells and react it with excess hydrochloric acid according to the following equation: CaCOs(s) + 2 HCe(aq) > CaCe2(aq) + CO2(g) + H20(e) The carbon dioxide gas produced is collected and found to be 1,06 dm® after all the calcium carbonate has reacted. M24 Define the term diluted acid. 7.2.2 Calculate the percentage calcium carbonate in the 5 g eggshells. 7.3. Sulphuric acid ionises in two steps as shown below: Show all the calculations. K, at 25°C Step 1 H2SO4 + H20 > H30* + HSO4 - Very large Step 2 HSO4- + H20 > H30* + SO42- 1,2 x 10-2 7.3.1 7.3.2 7.3.3 7.3.4 Explain why the Ka value for Step 1 is a very large number. H20 is acting as a base in both reactions. Give the definition of a base according to Lowry-Bronsted. Write down the FORMULA of a substance that acts as an ampholyte in these reactions. Write down the NAME for the conjugate base of HSO,". _ Copyright reserved (2) (6) (1) (1) (1) (1) [28] GRAND TOTAL: 150 Please turn over

Downloaded from hlayiso.com LIMPOPO/June 2024 - x Physical Science P2 Grade 12. DATA FOR PHYSICAL SCIENCES GRADE 12 tet PAPER 2 (CHEMISTRY) tty GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12 VRAESTEL 2 (CHEMIE) TABLE 1: PHYSICAL CONSTANTS / TABEL 1: FISIESE KONSTANTES NAME / NAAM SYMBOL / SIMBOOL VALUE / WAARDE Avogadro's constant Na 6,02 x 1023 molt TABLE 2: FORMULAE / TABEL 2: FORMULES ne ja M Na c= a or/of c= tt n= =. Vv MV Vis CoV n, C.LVp " ny me 7 iiealacad Kw = [HsO°J[OH1] = 1 x 10° at/by 298 K a = Fbatnode Faas (ee = Efatoce = Saas or/of =a = Esti ~ baer | =m ea Eran io Fesidacle or/of e@ _fe 8 6 _ fe _ fe Een _ E oxidising agent 7 EE sicgnaen / Ese _ E oxsideermiddel EE recast Copyright reserved

Downloaded from hlayiso.com pease yyBuAdoo sez zez 71 | ON | PW} Wy] $3] Jo | xg wd) Wy) nd} dN} n | eg UL €Ob | ZOb | bol | oor | 66 86 46 96 S6 6 £6 26 46 06 SLL ) 4 | 691 | Zor | sor | cor | est | sot | zor | ose ve, | bee | Opt NT | GA | Wh} 43 | oO | Ag GL | PD | nF | wg | wd} pn} ag 50] 9zz ~] bh oz 69 89 29 99 so | 99 £9 79 19 09 6g 8g oy jew 44 2 68 88 28 602 | 402 | voz |boz [Ze |s6r |zer [oer [oar [var 8b | 6L4b | 6eb | ze, | eer UN 13V B)Od 8] 1g S)qd sl ab 2|/5H | ny Id 4 }SO }8y | M JPL |sH es) eq eg g/so s 98 58 v8 £8 zg 18 08 62 BZ LL 92 SL |v Py zL Zs 9g Sg beb | Zeb |ez- [ezt lett [Set |ztt [eon oor col | LOL 96 26 16 68 88 98 4 3) 8L Siqg giugs Ul S| PO 3] By 2) Pd 8) ua Sing 8) on low =| an AZZ wu] 4S 3) qy € vs eg zg i] os 6b Eid lv 9p Sv be eh | cp. Ww ov 6 ge Ze 8 08 62 $2 €Z OL s9 |s‘e9 | 6s 6S 9S s¢ zs ts 8 SP Or 6e A | 48S) es 8) sy Sep siege UZ 3) ND Z| IN &] 09 Z] e4 sluNe| 49 = a IL B}9S g)eo s & 9¢ se ve ee ze be o¢ 6z sz | Zz 9% Sz | vz &z 44 | oz 6L Or s‘se ae Le 8z Lz esseuuooje OMaejel epsapeueg vz €z Av a2 Y nN IS glave SSEW DJWO}e VAl}e/O1 ayeUU|xoiddy 5IN Z| en & al c-) a nN © 8L au OL SL vL eb t ze LL 0z 6b OL vb ZL LL s‘¢9 vewmnebeue.nya/y 6 vi ©N $ $ 2 2 as yee no > — AyAeBau0. 99/5 = is i | 3 OL 6 8 Z 9 s | 6z v € v t L °H reeGuroory TALNFTSIAAW H&S z daquinu sJwoyy b (WA) (MAYA) (A) (a (i) (i) a a] a 2 rT a A re ¢ z L SLN3W3ATS JO DIGOM3d SHL ‘¢ ATAVL won Tes gp epaip “““bz0e euNf/OdOd WIT \ @d Se0UE!NS [eOISKYd

Downloaded from hlayiso.com LIMPOPO/June 2024 XEDUCTION POTENTIALS D-REDUKSIEPOTENSIALE olfreaksies E° (v) + 2,87 +1,81 2H 41,77 Mn?*+ 440 +151 Ch(g)~ 2¢ 2er + 1,36 | on02 = 44H! Se Cr +7HO | +133 O2{g) *4H' ae 2HO +1,23 MnQ2+4Ht = zo =) Mn® +2H2,0 +1,23 PR 2 Pt +1,20 i Bra(t) 28r +1,07 | - 4H NO(g)+2H,0 | +0,96 ; | Hg?! = 2) Ha() +0,85 } Agi ve Ag +0,80 @ | NO] +2 - NOx(g)+H20 | +0,80 ‘@ g | { Fe «« Fee +077 iS S| On(g) + 2Ht = 2c H202 + 0,68 g i fy Be" ar + 0,54 3 2 | s 6 | } Cu’ +e Cu + 0,52 s gf t 22 * 4H S$ +2H0 +0,45 a cal BHO + Oz 40H" + 0,40 Ss Cu? = 2 cu +0,34 8 $) | S02 +4Ht + 2 SO2g) +2420 | +0,17 8 3 cure = Cu +0,16 Py $ | ! Sn = 2 Sn?* +0,15 5 3 | | S+2H' 26 = Sig) +0,14 3 & | 2 sae Hal) 0,00 & 2} | Fe* + 3 Fe ~ 0,06 2 5 | | Pb* 26 = Pb -0,13 = = | | Sn? = Sn - 0,14 = 2| t - i -0,27 £ 2 | | = 0,28 3 3 ~ 040 2 > | { -0,41 > 5 | = 0,44 5 8 | } -0,74 $ 3 \ 1 -0,76 2 =) = 0,83 | ' -0,91 | -1,18 1 \ — 1,66 - 2,36 i =271 { -2,87 } ~ 2,89 2,90 - 2,92 ~ 2,93 ~ 3,05 Copyright reserve< aokeseteainn

Downloaded from hlayiso.com Physical Sciences P2 Grade 12. Increasing oxidising ability / Toenemende oksiderende vermoé Copyright reserved TABLE 4B: STANDARD REDUCTION POTENTIALS TABEL 4B: STANDAARD-REDUKSIEPOTENSIALE Half-reactions / Halfreaksies r= (Vv) Lite = Li - 3,05 K'+e = K -2,93 Cs*+e = Cs — 2,92 Ba*+2e = Ba 2,90 Sr*+2e = Sr - 2,89 Ca**+2e- = Ca — 2,87 Na*+e- = Na -2,71 Mg**+2e- = Mg — 2,36 AG +3e° = AL - 1,66 Mn**+2e- = Mn 1,18 Cr++2e° = Cr - 0,91 2H20 + 2e° == H2(g) + 2O0H™ - 0,83 Zn**+2e = Zn - 0,76 Cr++3e- = Cr - 0,74 Fe**+2e = Fe - 0,44 Crt++e- = Cre -0,41 Cd**+2e° = Cd —0,40 Co**+2e- = Co - 0,28 Ni*+2e7 = Ni - 0,27 Sn**+2e- = Sn - 0,14 Pb**+2e- = Pb -0,13 Fe*+3e = Fe — 0,06 2H*+2e" = Ha(g) 0,00 S+2H*+2e = HeS(g) +0,14 Sn**+2e- = Sn* +0,15 Cu*+e- = Cut +0,16 SO} + 4H +267 SO.(g)+2H,0 | +0,17 Cu*+2e- = Cu + 0,34 2H20 +O2+4e" = 4OH- +0,40 SO2 + 4H* + 4e- S +2H20 + 0,45 Cut+e7 = Cu +0,52 I+2e = ar + 0,54 O2(g)+2H*+2e" = H202 + 0,68 Fe*+e" = Fer +0,77 NO; +2H*+e" = NO2(g)+H20 +0,80 Ag’+e = Ag + 0,80 Hg**+2e- = Hog(t) + 0,85 NO} +4H*+3e" = NO(g)+2H.0 | +0,96 Bro(f)+2e° = = 2Br + 1,07 Ptt+2e = Pt +1,20 MnO2+4H* + 2e- = Mn? +2H20 +1,23 O2(g)+4H*+4e- = 2H20 + 1,23 CrO2- +14H*+6e- = 2Cr°+7H,0 | +1,33 Cl(g)+2e° = 2Ct + 1,36 MnO, +8H*+5e- = Mn?*+4H,0 +1,51 H2O2 + 2H* +2 e~ 2H20 +1,77 Co*+e = Co + 1,81 Fog)+2e° = 2F- + 2,87 LIMPOPO/June 2024 Increasing reducing ability / Toenemende reduserende vermoé