Physical Sciences Grade 12 P2 Mpumalanga Mock 2018 Question Paper

Downloaded from hlayiso.com education DEPARTMENT: EDUCATION MPUMALANGA PROVINCE NATIONAL SENIOR CERTIFICATE GRADE 12 PHYSICAL SCIENCES: CHEMISTRY (P2) SEPTEMBER 2018 MARKS: 150 TIME: 3 hours This question paper consists of 16 pages and 4 data sheets.

Downloaded from hlayiso.com 2 Physical Sciences/P2 NSC ‘ September 2018 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. 6. You may use a non-programmable calculator. 7. You may use appropriate mathematical instruments. 8. Youare advised to use the attached DATA SHEETS. 9. Show ALL formulae and substitutions in ALL calculations. 10. Round off your final numerical answers to a MINIMUM of TWO decimal places. 11. Give brief motivations, discussions, etcetera where required. 12. Write neatly and legibly. Copyright reserved Please turn over

Downloaded from hlayiso.com 3 Physical Sciences/P2 NSC September 2018 QUESTION 1 : MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Choose the answer and write down the letter (A-D) next to the question number (1.1-1.10) in the ANSWER BOOK, for example 1.11 D. 1.4 Consider the organic compound below: H H=- C-=- H | H H 16) dun Gas hom to | | | H H H— i —H H The IUPAC name of this compound is: A 1,2-dimethylbutanoic acid B 3-methylpentanoic acid C hexanoic acid D 1-ethyl-1-methylpropanoic acid (2) 1.2 The complete combustion of propane is represented by the balanced equation below: Cs3Hg(g) + 502(g) > 3CO2(g) + 4H20(€) 30 cm® of propane is mixed with 200 cm? of oxygen and the mixture is ignited. What is the volume, in cm’, of the COs in the resulting gas mixture? (All the volumes are measured at the same temperature and pressure) A 230 B 140 Cc 120 D 90 ‘ (2) Copyright reserved Please turn over

Downloaded from hlayiso.com 4 Physical Sciences/P2 NSC September 2018 1.3 Consider the following diagram: Ho Butene _ Product X The name of product X as well as the type of reaction taking place respectively, are: oe 2 ProducttX | Type of reaction — A dichlorobutene ~ hydration ~ B butadiene addition Cc butane hydrogenation D butyne elimination 1.4 The Maxwell-Boltzmann distribution curves below show the number of particles as a function of their kinetic energy for a reaction, at four different temperatures. The minimum kinetic energy needed for effective collisions to take place, is represented by E. 4 I Yn 2 AS) = o Q. xe) . oO a E : 3 ~ Zz mh arr . “, ss > Kinetic energy Which ONE of the curves represents the reaction that takes place at the highest temperature? A | B tl Dp UW (2) Copyright reserved Please turn over

Downloaded from hlayiso.com 5 Physical Sciences/P2 NSC September 2018 1.5 The reaction represented by the equation below, reaches equilibrium. Co(H20)¢"* (aq) + 4CE (aq) = CoCk,? (aq) + GH2O(t) AH>0 pink blue Which ONE of the following changes in the reaction mixture will change the colour from blue to pink? A Adda catalyst. B Heat the reaction mixture. C Adda few drops of concentrated hydrochloric acid in the reaction mixture. D Put the reaction mixture in ice. (2) re Which ONE is the conjugated acid of HC2O« ? A C20," B OH C HeC20, D HC20, (2) 1.7 Which ONE of the following solutions can be stored in an aluminium container? A CuSO,(aq) B ZnSO,(aq) C NaCf(aq) D — Pb(NOs)a(aq) 1.8 In all electrochemical cells, the cathode is always the ... A __ positive electrode. B negative electrode. C electrode where reduction takes place. D electrode where oxidation takes place. . (2) Copyright reserved Please turn over

~ Downloaded from hlayiso.com | 6 Physical Sciences/P2 NSC : September 2018 1.9 Which ONE of the following statements about the process of extraction of aluminium in an electrolytic cell, is TRUE? A Carbon dioxide is released at the anode. B Aluminium forms at the anode. C The oxygen formed at the anode, reacts with the aluminium. D Carbon dioxide gas is released at the cathode. (2) 4.10 The process in industry whereby nitrogen gas is prepared, is called: A Contact process, B_ Fractional distillation C Ostwald process. D Haber process (2) [20] Copyright reserved Please turn over

Downloaded from hlayiso.com re Physical Sciences/P2 NSC September 2018 QUESTION 2 (Start on a new page) The letters P to U in the table below represent six organic compounds. ) 1 H HH vam nt —o—t tt, ‘ Crathyfbropdnoate j H i | H 3-methylbutan-2-ol CH3CH2CH2CO2H H—C—H -E~C C~¢ H | HHH I ty HCE ee U_ | CH3CH2CHsCOCH2CH3 H | Br Br H H—C—H i Use the table to answer the following questions: 241 Define the term homologous series. (2) 2.2 Write down the LETTER(S) that represent(s) the following: (A compound/ letter may be used more than once) 2.2.1 Aketone. (1) 2.2.2 Acarboxylic acid. (1) 2.2.3 Acompound with the general formula CrHen (1) 2.2.4 Two compounds that are FUNCTIONAL ISOMERS. (2) 2.3 Write down the IUPAC name of compound: 231 T (3) 2.3.2 U (2) 2.4 Write down the STRUCTURAL FORMULA of compound: 24.1 Q (2) 2.4.2 R (2) [16] Copyright reserved Please turn over

Downloaded from hlayiso.com 8 Physical Sciences/P2 NSC September 2018 QUESTION 3 (Start on a new page) A learner received four bottles containing different organic compounds. He took a sample from each bottle and determined the boiling point of each under the same conditions. The results are shown in the table below. “[~ Compound | Molecular "| Molecular mass Boiling point | | formula (g:mol) o} CC) A | Ethane CoHe 30,0 -89 B | Chloroethane CoHsCe 64,5 12 Cc Ethanol CoHeO 46,0 78 [0 Ethanoic acid CoHsO2 60,0 118 a1 Define the term boiling point. 3.2 For this experiment write down the: 3.2.1 Independent variable. 3.2.2. The variable that was controlled during the investigation. 3.3 From the table, write down the letter (A, B, C or D) of a compound that will be in gas phase at 10° C. 3.4 Write down the type of intermolecular force (Van der Waals force) between the molecules of each of the following compounds: 3.4.1. Compound A 3.4.2 Compound B 3.5 Which ONE of compound A or B, will have the higher vapour pressure at a given temperature? Refer to the data in the table and explain your answer. 3.6 Explain the difference in the boiling points of compounds Cand D. 3.7 How will the boiling point of the ester, methyl methanoate compare to that of compound D? Choose from HIGHER THAN or LOWER THAN. Copyright reserved Please turn over (1) (1) (2 (3 (i [1

Downloaded from hlayiso.com 9 Physical Sciences/P2 NSC September 2018 QUESTION 4 (Start on a new page) The flow diagram below shows how alcohols react to form other organic compounds. Secondary Reaction A.) Compound X alcohol CHsCHCfCH3 + concentrated KOH Reaction C Reaction B Reaction D | + H2 ¥ Alkane 44 Write down the type of reaction represented by reaction: 4141 A (1) 412 B (1) 41.3 D (1) 4.2 In reaction B, compound X is converted to an alkene. Write down the: 4.2.1. |UPAC 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 10 Physical Sciences/P2 NSC ‘ September 2018 QUESTION 5 (Start on a new page) The following apparatus was used by a group of learners in an investigation to find out how surface area affects the rate of the reaction. In both experiments, magnesium with the same mass (25g) were used. In EXPERIMENT I, small pieces were used, In EXPERIMENT II, one big piece was used. 400 cm? of a 0,1 mol-dni® hydrochloric acid solution was used in both experiments. During the reaction, the gas that formed, was collected in the gas syringe which measures the volume of gas produced. The balanced equation for the reaction is: Mg(s) + 2HC&(aq) MgCta(aq) + He(g) 100 cm? of 0,1 mol-dm? Magnesium hydrochloric acid The learners performed the experiments and plotted a graph of their results for EXPERIMENT I, which is represented below. *. Volume gas (em*) ly Time (s) Copyright reserved Please turn over

Downloaded from hlayiso.com W Physical Sciences/P2 NSC September 2018 5.1 Write down the dependent variable for this investigation. (1) 5.2 Besides the mass and the concentration of the reactants, give ONE other variable that must be kept constant during this investigation. (1) 5.3 Use the graph to calculate the average rate of the reaction (in dm*.s”) for the first 30 seconds. (3) 5.4 Predict how the gradient of EXPERIMENT II would compare to that of EXPERIMENT | plotted in the graph. Choose from GREATER THAN, LESS THAN or EQUAL TO. (1) 5.5 Use the collision theory to explain how the increase in surface area of the magnesium affects the rate of the reaction. (3) 5.6 Calculate the mass of magnesium that emains after the reaction has been completed. (6) [15] Copyright reserved Please turn over

Downloaded from hlayiso.com 12 Physical Sciences/P2 NSC . September 2018 QUESTION 6 (Start on a new page) The reaction represented by the equation below, reaches equilibrium in a closed container at a certain temperature. CSa(g) + 3Cha(g) = S2Ch(g) + CCt(g) AH<0 6.1 Is the above equilibrium a HOMOGENEOUS or a HETEROGENEOUS equilibrium? (1) 6.2 Give a reason for thel answer in QUESTION 6.1. (2) 6.3 __ Initially 1,2 moles of CS2(g) and 4 moles of Cl(g) are injected into a 2 dm*® sealed container. Analysis of the equilibrium mixture shows that 138,6 g of CCR (g) is present. Calculate the equilibrium constant (Kc) at this temperature. (8) 6.4. More SeCfz is added to the equilibrium mixture at a constant temperature and pressure. How will this change the following? Choose from: INCREASES, DECREASES or REMAINS THE SAME. 6.4.1. Concentration of CCfa(g). (1) 6.4.2 Number of moles of Clo. (1) 6.4.3 Value of the equilibrium constant (Ke). (1) 6.5 Use Le Chatelier’s principle to explain the answer in QUESTION 6.4.2. (3) The graph below shows the change in the rate of reaction after further changes were made to the above equilibrium mixture. N vy ts, ts 4 Forward reaction ————_ Reverse reaction ~~"77-" 7" Rate (mol-s") 0 5 10 15 22 Time (minutes) 6.6 Write down a possible disturbance, other than temperature, responsible for the sudden change in reaction rate in the 5" minute. (1) 6.7 If the change in reaction rate at the 15" minute is due to a change ‘in temprature, did the temperature INCREASE or DECREASE ? (1) 6.8 Refer to the graph and explain the answer in QUESTION 6.7. (1) [20] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 NEC September 2018 QUESTION 7 (Start on a new page) 7.1 Give a reason why sodium hydroxide is classified as a strong base. (2) 7.2. Determine the pH of a 0,2 mol-dm® solution of H2SO, at 25°C. (3) 7.3 Calculate the concentration of a NaOH solution with a pH of 13. (3) 7.4 A few crystals of sodium carbonate (NagCOg) are added to water in a test tube. 7.4.1 Is the solution in the test tube ACIDIC, BASIC or NEUTRAL? (1) 7.4.2. Use a balanced equation to explain your answer in QUESTION 7.4.1. (2) 7.5 A 25 g sample of impure sodium carbonate (Na2COs) is treated with EXCESS dilute sulphuric acid. The balanced chemical equation for the reaction is: Na,CO3(aq) + H2SO.(aq) > NazSOa(aq) + H2O(t) + CO2(g) During the reaction, 4,48 dm of carbon dioxide gas is collected at STP. Calculate the percentage purity of the sodium carbonate. (5) [16] Copyright reserved Please turn over

- Downloaded from hlayiso.com 14 Physical Sciences/P2 NSC ; September 2018 QUESTION 8 (Start on a new page) A galvanic cell is set up based on the reaction represented by the equation below. The reaction takes place under standard conditions. Feet + Ti 2 Fe + Ti* Fe — Ti Fe* (aq) —- Ti* (aq) 8.1 Define the term oxidation in terms of oxidation number. (2) 8.2. State TWO functions of the salt bridge. (2) 8.3 Write down the: 8.3.1 Half-reaction that takes place at the cathode. (2) 8.3.2 Cell notation for this cell. (3) 8.4. The initial reading on the voltmeter is 1,57 V. Calculate the standard reduction potential of the Ti electrode. (4) 8.5 Write down the value of the reading on the voltmeter when the cell reaction reaches equilibrium. (1) 14] Copyright reserved Please turn over

Downloaded from hlayiso.com 15 Physical Sciences/P2 NSC September 2018 QUESTION 9 (Start on a new page) High purity silver is obtained by electrolysis using a thin, pure silver cathode and an acidified solution of silver sulphate. +1 battery |+ 4 S me} 2 @ fo} fom ® ne} oD < 6 Aga(SO4) 3 w = 1 (A) 9.1 Define the term electrolysis. (2) 9.2 Write down the: 9.2.1 Half reaction that takes place at the anode. (2) 9.2.2 Nett cell reaction that takes place in the cell. (2) 9.3 State the relationship between CURRENT and the MASS DEPOSITED depicted by the graph. (1) 9.4 When a constant current flows for 60 min, 17 g of pure silver is deposited at one of the electrodes. 9.4.1. At which electrode, P or Q, will the silver be deposited? (1) 9.4.2 Would the mass loss at the other electrode be LARGER THAN, SMALLER THAN or EQUAL TO 17 g? (1) 9.4.3 Calculate the number of moles of silver deposited. (2) 9.4.4 Calculate the number of electrons transferred. (2) [13] Copyright reserved Please turn over

Downloaded from hlayiso.com 16 Physical Sciences/P2 : NSC September 2018 QUESTION 10 (Start on a new page) 10.1 The flow diagram below represents the processes used to manufacture fertilizer A. Both the Haber and the Ostwald processes are part of the total process. Hy 4 HAJO, >» Nitrogen Ammonia A Hydrogen Nitric acid Ammonia Step 1 of the Ostwald process > NO2 Oxygen 10.1.1 Write down the name of a suitable catalyst used in the Haber process. 10.1.2 Write down the FORMULA of the compound represented by A. 10.1.3 Write down a balanced chemical equation for Step 1 of the Ostwald process. 10.2 You want to start a vegetable garden in your community. You obtain the following bags of fertilisers as described below. ., 4 yg 29037 t “Pe 1¢US= 3.58%, S Nek Ne, X: 4:6:9 (43) cas 2% keg! 21,24'lo 'S vere MUS 3. Ys 18:3: (1) =a 5! SMH Peak 10.2.1 From fertilisers X and Y, choose a fertiliser which is most suitable for the growth of tomatoes. 10.2.2 Give a reason for the answer in QUESTION 10.2.1. 10.2.3 Calculate the mass of potassium in a 20 kg bag of fertiliser Y. TOTAL: Copyright reserved Please turn over (1) (1) (3) (1) (1) (3) [10 151

Downloaded from hlayiso.com Physical Sciences/P2 17 NSC DATA FOR PHYSICAL SCIENCES GRADE 12 PAPER 2 (CHEMISTRY) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12 VRAESTEL 2 (CHEMIE) TABLE 1: PHYSICAL CONSTANTSITABEL 1: FISIESE KONSTANTES September 2018 NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE es Ley e ; 16x 10"C TABLE 2: FORMULAE/TABEL 2: FORMULES m N n=— nh=—~ M N, n m Vv = lof =— n=—- c v orloi e MV v, Cae Me H = -log[H30° CM, ny pH = -log[H30'] Ky = [H3O°J[OH] = 1 x 10 atiby 298 K ee 8 6 _fe 8 Een = E cathode ~ Eade JE sey = E katods 7” Eade orlof @ _e 6 6 _pe t) , Een = E reduction ~ E esidation | Ea = Edits 7 E cesidatio orlof 6 _fe 8 6 _5e a Eee = E ising agent - E reducing agent (Eta = E cxsidecnmiddel ~ E eduseermiddel Copyright reserved Please turn over

September 2018 18 NSC Downloaded from hlayiso.com Physical Sciences/P2 SINSWITA NVA TaaVL EV ELC Oldad Jig “€ Taavt SLNaWa1a 40 31avL g1goldad SHL *€ a1eavi so | xa | WO | wy 86 16 96 6 eoL 6S/ LSb eSh fa} 4 | PD | nS oe g9 | so | vo | £9 ey el 44 2 88 28 602 L0Z = | 702% L0z 16+ | S6b Z6L Leb eeb ud yy Bod 8) !a B| dds gL 25H |nv \3d jl eg giso a 98 ss 8 €8 z8 18 08 6L gL LL gS SS beh rKA} gzb | 2b 6bb Sbb ZbL 80} 90b cob bob 96 88 98 3X wlap igs 2|USe ul 2|po | By 2| Pd S[Ua 8 Me S) OL S|OW =| IN Ig 2/9 s Ss es es bs os 6P Sy LY oF Sv $v ev ev hd ge Le v8 08 6L SL | el ol g9 g‘¢9 6S 6S OV 6e 4y iq 319g BI SV 8)29 3/29 2] UZ 3/M9 &| IN 09 As eos 2 ge SE ve ee ze be og 6% gz Le x4 02 6L Op jgse | Zt ve 82 Le pssemuooje emarfejed apsepeueg ve &@ ay (305 S$ 3 aa ssew o}woye aAte|e, ayewrxoiddy BW Z| BN 3 gL Lb OL SL eb (43 Lb 02 6L 9b vb bb é 6 L oN £10 %| N > jooqus | 2° = |,_yempebouoayela eq alil1s o | 6 8 L 5 joquiks ” "2 © [ AyaneBau0sje13 ¢ e v L eH eyaBwoojy H 3 | snort aqui JaLNITS/ASA L aia) Gia) AW (a) {i) () () 8b db 9b Sb vb el ZL bb Ob 6 8 £ 9 S z L Please turn over Copyright reserved

Downloaded from hlayiso.com 19 Physical Sciences/P2 ~ NSC TABLE 4A: STANDARD REDUCTION POTENTIALS TABEL 4A: STANDAARD-REDUKSIEPOTENSIALE Increasing oxidising ability/Toenemende oksiderende vermoé Half-reactions/Halfreaksies E“(v) Fo(g)+2e = 2F- + 2,87 Co* +e" = Co” +184 H202+2H"+2e = 2H20 41,77 MnO] +8H'+5e" -. Mn?" +4H20 + 4,51 Cho(g)+2e" = 2C0 + 4,36 C03 + 14H +6e" = 20H + 7HZO | +133 O2(g)+4H*+4e7 = 2H20 + 4,23 Mn02+ 4H" +2e7 = Mn?" + 2H2O + 1,23 Pe +2e7 Pt + 1,20 Bro(t)+2e7 = Br + 1,07 NOZ +4H'+3e = NO(g)+2H20 | +0,96 Hg” +2e = Hg(t) + 0,85 Ag’te = Ag~ + 0,80 NO3+2H’+e" = NO2(g)+H20 | +0,80 Fe" +e = Fe* +0,77 Ox(g) + 2H'+2e° = H202 +0,68 Ip+2e7 = 2 +054 Cu’+e7 = Cu + 0,52 SO2+4H’+4e" = S+2H20 + 0,45 2H.0+02+4e = 4OH™ + 0,40 Cu*+2e = Cu + 0,34 S02 +4H'+2e° = SO2(g)+2H20 | +0,17 cu*+e = Cu +0,16 Sn +2e = Sn* +0,15 S+2H’+2e = H2S(g) + 0,14 2H*+2e7 = Ha(g) 0,00 Fe“ +3e = Fe = 0,06 Pb" +2e = Pb —0,13 Sn*+2e = Sn ~0,14 Ni** + 267 Ni - 0,27 Co* + 26° Co ~ 0,28 Cd**+2e = Cd — 0,40 Cr'+e «= Cr” -0,44 Fe’ +2e = Fe - 0,44 Crt +3e = Cr, 0,74 Zn" + 2e7 Zn ~ 0,76 2H20 + 2e7 H2(g)+ 20H | —0,83 Cr* + 2e7 Cr -0,91 Mn?*+2e° = Mn ~1,18 At’ +307 = AL — 1,66 Mg”? +2e° = Mg — 2,36 Na’+e = Na -2,71 Ca" +2e 2. Ca ~ 2,87 Sr*+2e = Sr — 2,89 Ba** + 2e7 Ba ~ 2,90 Cs'+e = Cs - 2,92 K+e = K — 2,93 Lite « Li — 3,05 Copyright reserved Increasing reducing ability/ Toenemende reduserende vermoé September 2018 Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 Increasing oxidising ability/Toenemende oksiderende vermoé Copyright reserved TABLE 4B: STANDARD REDUCTION POTENTIALS TABEL 4B: STANDAARD-REDUKSIEPOTENSIALE 20 NSC NSS Half-reactions/Halfreaksies ET(v) tite = Li — 3,05 K+e = K — 2,93 Cs*te = Cs — 2,92 Ba" +2e° = Ba — 2,90 SPfi+2e = Sr — 2,89 Ca**+2e7 = Ca — 2,87 Na’+e7 = Na 2,71 Mg?*+2e7 = Mg — 2,36 AG +3e° = AC — 1,66 Mn +2e7 = Mn — 1,18 Cr +2e = Cr - 0,91 2H20 + 26" H2(g) + 20H” - 0,83 Zn™ + 267 Zn ~ - 0,76 Crt +3e = Cr - 0,74 Fe" +2e7° = Fe, — 0,44 crite = Cm —0,44 Cd*+2e7 = Cd — 0,40 Co" +2e = Co — 0,28 Ni#*+2e = Ni —0,27 Sn?*+2e = Sn —0,14 Pb? +2e = Pb -0,13 Fe’ +3e" = Fe - 0,06 2H'+2e7 = Ha2(g) 0,00 S+2H'+2e7 = H2S(g) + 0,14 Sn“ +2e = Sn* +0,15 Cu* +e = Cu’ + 0,16 S027 44H’ +2e = SO2(g)+2H20 | +0,17 Cu +2e = Cu + 0,34 2H20+02+4e = 4OH + 0,40 SO2+4H’+4e = S+2H20 + 0,45 Culte” = Cu + 0,52 Ipt2e7 = 2k + 0,54 O2(g)+2H'+2e = H2O2 + 0,68 Fe +e" = Fe* +0,77 NO3 +2H'+e7 «= NO2(g)+H20 | + 0,80 Ag’+e7 = Ag + 0,80 Hg? +2e = Ha(t) + 0,85 NO3 +4H'+3e = NO(g)+2H20 + 0,96 Bro()+2e = 2Br + 1,07 Pt*+2e = Pt + 1,20 MnO2+4H'+2e° = Mn™*+2H20 + 4,23 O2(g)+ 4H +4e7 = = 2H20 + 1,23 Cr027 + 14H? +6e" = 20°" + 7H2O | + 1,33 Cho(g)+2e = 260 + 1,36 MnO] +8H'+5e = Mn+ 4H20 + 4,51 H202+2H'+2e = 2H20 44,77 Co“ +e = Co” + 1,81 Fo(g)+2e = 2F- + 2,87 Increasing reducing ability/Toenemende reduserende vermoé September 2018