Physical Sciences Grade 12 P2 NSC June 2013 QP (Eng)

Downloaded from hlayiso.com basic education Department: Basic Education REPUBLIC OF SOUTH AFRICA SENIOR CERTIFICATE EXAMINATION PHYSICAL SCIENCE P2 CHEMISTRY STANDARD GRADE 2013 MARKS: 150 PHYSICAL SCIENCE SG: Paper 2 TIME: 2 hours 3042E 30422E This question paper consists of 13 pages, 4 data sheets and 1 answer sheet. X@5 MNT Copyright reserved UUM ACE TT A Please turn over RUE

Downloaded from hlayiso.com Physical Science/SG/P2 2 DBE/2013 SCE INSTRUCTIONS AND INFORMATION ao Write your centre number and examination number in the appropriate spaces on the ANSWER BOOK. 2. Answer ALL the questions. 3. You may use a non-programmable calculator. 4. You may use appropriate mathematical instruments. 5. Data sheets and a periodic table are attached for your use. 6. You may forfeit marks if you do not follow instructions. QUESTION 1 INSTRUCTIONS AND INFORMATION 1. Answer this question on the attached ANSWER SHEET. Write your centre number and examination number in the appropriate spaces. 2. Various options are given as possible answers to the following questions. Each question has only ONE answer. Choose the correct or best answer and make a cross (X) in the block (A—-D) next to the question number (1.1—1.15) on the ANSWER SHEET. 3. Do not make any other marks on the ANSWER SHEET. Any calculations or writing that may be necessary when answering this question should be done in the ANSWER BOOK and must be deleted clearly by means of a line drawn across the page. 4. If more than ONE block is marked per question, no marks will be awarded for that answer. PLACE THE COMPLETED ANSWER SHEET INSIDE THE FRONT COVER OF YOUR ANSWER BOOK. EXAMPLE: QUESTION: The symbol for the SI unit of time is ... when 2 Zea ANSWER: A |B D Con eed CA ALOT tm cnr

Downloaded from hlayiso.com Physical Science/SG/P2 3 DBE/2013 SCE 77 The temperature of a gas is ... A __ the heat of the gas. B__ the product of the pressure and volume of the gas. C —ameasure of the number of moles of the gas. D —_ameasure of the average kinetic energy of the molecules of the gas. (3) 1.2 The volume of an enclosed mass of gas is decreased without a change in temperature. The gas pressure increases because ... A __ the gas particles are smaller. B __ the gas particles are moving faster. C _asmaller distance separates the gas particles. D the number of collisions with the walls of the container increases. (3) 1.3 The molecules in an ice crystal are held together by ... A __ hydrogen bonding. B covalent bonding. C Van der Waals forces. D __ ionic bonding. (3) 1.4 A sulphur compound that can act as both a reducing agent and an oxidising agentis ... A HS. B SO2. CC SOs, D HSOx, (3) 1.5 A few potassium permanganate crystals are added to chloroform and water in a test tube and mixed thoroughly. Which ONE of the following observations will be made after a while? TOP LAYER BOTTOM LAYER (WATER) (CHLOROFORM) A | purple colourless B | purple purple C | colourless purple D_ | colourless colourless (3) Conan roene ANN Pee tum over

Downloaded from hlayiso.com Physical Science/SG/P2 4 DBE/2013 SCE 1.6 When concentrated sulphuric acid is added to blue copper sulphate crystals, the crystals turn white. In this reaction, sulphuric acid acts as a/an... A B Cc D reducing agent. oxidising agent. bleaching agent. dehydrating agent. (3) 7 The pH of an aqueous solution of ammonia (NHs) will probably be ... A 11. B Cc D (3) 1.8 In a standard Zn-Cu electrochemical cell, the electrolyte at the anode consists ofa... A 1,0 mol.dm® solution of Zn”* ions. B 0,1 mol.dm® solution of Cu" ions. C 1,0 mol.dm® solution of Cu?* ions. D 0,1 mol.dm® solution of Zn* ions. (3) 1.9 A protolytic reaction is one in which ... A OH ions are liberated. B electrolysis takes place. C__ proton transfer takes place. D electron transfer takes place. (3) 1.10 A reaction between marble chips (CaCO3) and dilute hydrochloric acid (HC?) takes place according to the following balanced equation: CaCO3(s) + 2HCf(aq) — CaCh(aq) + H2O(t) + CO2(g) In this reaction, the rate of CO2(g) production can be DECREASED by ... A __ adding more marble chips. B _ stirring the reaction mixture. C adding water to the reaction mixture. D grinding the marble chips into smaller pieces. (3) Cony esoved AN YA A Pease tum ove

Downloaded from hlayiso.com Physical Science/SG/P2 5 DBE/2013 SCE 1.11. When a chemical reaction is in equilibrium, the ... A __ concentration of the reactants is zero. B reactants and products have the same mass. C reactants and products have the same concentration. D forward and reverse reactions occur at the same rate. (3) 1.12 In which ONE of the following reactions taking place in closed containers will an increase in pressure, obtained by decreasing the volume of the container, shift the equilibrium to the right? 2HI(g)= H2(g) + 12(g) 2S03(g) = 2S02(g) + O2(9) 2CO(g) + O2(g) = 2C02(g) N2O04(g) = 2NO2(g) (3) 00 80 > 1.13 In the reaction Mg + Pb(NO3)2 — Pb + Mg(NOs) ... Mg is reduced. A B_Pbis oxidised. C Pb(NOs)2 acts as the oxidising agent. D Mg(NOs3)2 acts as the oxidising agent. (3) 1.14 | The organic compound with the formula C3Hg is an example of a/an ... A alkane. B alkene. C alkyne. D __haloalkane. (3) 1.15 Which ONE of the following compounds is a product formed when butane burns in excess oxygen? A Ethane B__Butanol C_ Butene D Carbon dioxide (3) [45] Conran AN 0 Pose um oer

Downloaded from hlayiso.com Physical Science/SG/P2 6 DBE/2013 SCE ANSWER QUESTIONS 2-8 IN THE ANSWER BOOK. INSTRUCTIONS AND INFORMATION a Start EACH question on a NEW page in your ANSWER BOOK. 2. Leave ONE line between two subquestions, for example between QUESTION 2.1 and QUESTION 2.2. 3. Show the formulae and substitutions in ALL calculations. 4. Number the answers exactly the same as the questions. QUESTION 2 (START ON A NEW PAGE.) 2.1 A learner investigates the relationship between pressure (p) and volume (V) of a given mass of gas at 25 °C. The results are plotted as a graph of p versus XK, as illustrated below. P (kPa) 80 f----22--222-2--y 0 H K 2.1.1 Write down TWO variables that the learner had to keep constant during this investigation. (2) 2.1.2 Formulate (state in words) the relationship between pressure (p) and volume (V) that can be deduced from the above graph. (2) 2.1.3 Name the law that the learner was investigating. (1) _ If the above investigation was carried out at a higher temperature, would the pressure for the XK, value at x be MORE THAN, LESS THAN or EQUAL TO 80 kPa? (2) 2.1.5 For which conditions of temperature and pressure will the law named in QUESTION 2.1.3 NOT be obeyed? (2) Conse A Ug Poses tm

Downloaded from hlayiso.com Physical Science/SG/P2 7 DBE/2013 SCE 2.2 Consider the following list of chemical substances represented by the letters A-E: A: KI(s) B: CO2(s) C: HO) ~—-D: CCR(2) ~~ E: -Hg(2) In this question, only write down the letter (A-E) representing the substance. A letter may be used more than once. From the list above, select a substance which is a ... 2.2.1 solid with Van der Waals forces between its particles. 2.2.2 non-polar solvent. 2.2.3 solvent in which solid iodine will readily dissolve. 2.2.4 solvent in which KI(s) will dissolve. QUESTION 3 (START ON A NEW PAGE.) Sulphur dioxide gas (SOz) is prepared in a school laboratory by reacting dilute sulphuric acid with sodium sulphite. 3.1 Write down a balanced equation for the reaction that takes place. 3.2 Is SO collected by the UPWARD or DOWNWARD displacement of air? Give a reason for your answer. 3.3 Describe the effect that SO2(g) has on a person when inhaled. The SO2 gas is now bubbled through an aqueous solution of iron(III)chloride (FeCés). 3.4 Which colour is the solution of iron(Ill)chloride before the gas is bubbled through it? 3.5 To which colour does the solution of iron(IIl)chloride change after the gas was bubbled through it? 3.6 Write down the half-reaction that explains the colour change observed in QUESTION 3.5. (1) (1) (1) [13] (3) (2) (1) (1) (1) (2) [10] Coprintesoved JNA Pease um over

Downloaded from hlayiso.com Physical Science/SG/P2 8 DBE/2013 SCE QUESTION 4 (START ON A NEW PAGE.) 41 4.2 4.3 The following unbalanced equation represents the first stage in the industrial preparation of nitric acid: NH3(g) + O2(g) —- NO(g) + H20(g) 4.1.1 Balance the equation. 4.1.2 | Whatis this first stage called? 4.1.3. Name a catalyst that can be used in this reaction. When a learner adds concentrated nitric acid to pieces of copper, a green solution forms and a dense reddish brown vapour is released. When water is added to the green solution, the solution turns blue. 4.2.1. Write down the NAME and FORMULA of the reddish brown vapour. 4.2.2 Identify the ion that is responsible for the blue colour of the solution. A learner adds a few drops of silver nitrate to a test tube containing an aqueous solution of potassium iodide and notices the formation of a precipitate. 4.3.1. What is the colour of the precipitate that is formed? 4.3.2 Write down the balanced equation for the reaction between silver nitrate and potassium iodide. (2) (2) (1) (2) (2) (2) (3) [14] Coosened Lg Peet

Downloaded from hlayiso.com Physical Science/SG/P2 9 DBE/2013 SCE QUESTION 5 (START ON A NEW PAGE.) 5.1 One of the reactions taking place in a closed container in the contact process for the production of sulphuric acid is: 2802(g) + O2(g) = 2803(g) AH<0 5.1.1 Is the forward reaction EXOTHERMIC or ENDOTHERMIC? (1) 5.1.2 Give a reason for your answer to QUESTION 5.1.1. (1) 513 Will the mass of SO3 produced at equilibrium INCREASE, DECREASE or REMAIN THE SAME if a suitable catalyst is added? (2) 5.1.4 | How will the rate of the forward reaction be influenced if the: (Write only INCREASES, DECREASES or REMAINS THE SAME.) (a) Temperature is increased (2) (b) Concentration of SO> is increased (2) 5.1.5 How will the yield of SO3 be affected if the: (Write only INCREASES, DECREASES or REMAINS THE SAME.) (a) Temperature is increased (2) (b) Concentration of SOz is increased (2) 5.1.6 Give a suitable explanation for the answer to QUESTION 5.1.5(a), using Le Chatelier's principle. (3) Cop esoved NAN A A Pose um ove

Downloaded from hlayiso.com Physical Science/SG/P2 10 DBE/2013 SCE 5.2. Test tube X contains 30 cm® of a 1 mol.dm® HCE solution at a temperature of 25 °C, while test tube Y contains 20 cm? of a 1 mol.dm™® HC? solution at a temperature of 50 °C. 1,5 g of marble chunks (calcium carbonate) are added simultaneously to each test tube. —, 3 -3 NW —___ 30 om’ 1 mol.dm™? HC2 . 20 cm? 1 mol.dm® HC? at 25 °C +— at 50°C wvw wvw wvw wvyw7 ww ww \wy \wy X v 5.2.1 In which test tube (X or Y) will the reaction occur at the highest rate? (1) _ Give a reason for the answer to QUESTION 5.2.1. (2) 5.2.3 Besides the factor responsible for the difference in the rate of the reaction in QUESTION 5.2.1, state TWO other factors that could be used to increase the rate of the reaction in test tube X. (2) [20] Coheed A 00 Peas um ov

Downloaded from hlayiso.com Physical Science/SG/P2 11 DBE/2013 SCE QUESTION 6 (START ON A NEW PAGE.) 6.1 Equal volumes of solutions represented by the letters A-F are supplied: bromothymol blue 0,20 mol.dm” HCE (aq) 0,20 mol.dm® H2SO, (aq) 0,01 mol.dm® NaOH (aq) 0,25 mol.dm®> NasCO3 (aq) 0,05 mol.dm® CH3COOH (aq) IMVOO> In this question, only write down the letter (A-F) representing the solution. A letter may be used more than once. Choose from these solutions the one that: 6.1.1 Is a weak base (2) 6.1.2 Is a diprotic acid (2) 6.1.3 Has the largest concentration of hydrogen ions (2) 6.1.4 Is an acid-base indicator (2) 6.2 It is found that 30 cm? of a solution of NaOH of concentration 0,01 mol.dm* neutralises 12 cm? of a HC? solution. 6.2.1 Write down the balanced equation for the reaction that takes place. (3) 6.2.2 Calculate the concentration of the HC? solution. (5) 6.2.3 Will the approximate pH of the final solution at the endpoint of the titration be SMALLER THAN 7, EQUAL TO 7 or GREATER THAN 7? (1) [17] cont eon A 0 Pass tim oe

Downloaded from hlayiso.com Physical Science/SG/P2 4 DBE/2013 SCE QUESTION 7 (START ON A NEW PAGE.) A learner sets up a standard electrochemical (galvanic) cell, by placing a copper electrode in a solution of copper nitrate and a zinc electrode in a solution of zinc nitrate. The letters B—F are labels for the components that make up this cell. It is observed that the electron current produced flows from C to B through the ammeter. (a) B c ———— p—4 E —,p F 7.1 Write down the: 7.1.1 Symbol for the metal represented by C (2) 7.1.2 Formula of a compound that can be used to prepare solution F (2) 7.1.3 Name of a salt that can be used to prepare the solution used in component D (2) 7.2. State ONE function of component D. (1) 7.3 Is electrode B the ANODE or the CATHODE of the cell? (1) 7.4 Give a reason for your answer to QUESTION 7.3. (1) 1) What are the standard conditions for this cell? (2) 76 Will the mass of the zinc electrode INCREASE, DECREASE or REMAIN THE SAME while the cell is delivering current? (1) 7.7 Write down the equation for the half-reaction that explains the answer to QUESTION 7.6. (2) 7.8 Identify the oxidising agent in the reaction that takes place in this cell. (2) 7.9 Write down the cell notation for this electrochemical cell. Hel cor ened 0 08 Poss tum ovr

Downloaded from hlayiso.com Physical Science/SG/P2 13 DBE/2013 SCE QUESTION 8 (START ON A NEW PAGE.) Consider the following formulae of organic compounds represented by the letters AtoE: 8.1 Which organic compound (A or B) reacts more readily with a solution of bromine? (2) 8.2 Give a reason for your answer to QUESTION 8.1, by refering to the difference in the structures of A and B. (2) 8.3 Name the type of reaction that occurs when B reacts with bromine. (2) 8.4 Write down the letters of TWO organic compounds from the list that belong to the same homologous series. (2) 8.5 The IUPAC name of D is butane. Write down the IUPAC name of an isomer of D. (2) 8.6 Write down the letter of the compound that contains the functional group of the carboxylic acids. (2) [12] TOTAL: 150 Copyrant reserved UMN AATEC A

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Downloaded from hlayiso.com Physical Science/SG/P2 1 DBE/2013 SCE DATA FOR PHYSICAL SCIENCE PAPER 2 (CHEMISTRY) GEGEWENS VIR NATUUR- EN SKEIKUNDE VRAESTEL 2 (CHEMIE) TABLE 1: PHYSICAL CONSTANTS TABEL 1: FISIESE KONSTANTES Avogadro's constant Avogadro-konstante Na orlof L 6,02 x 107° mol" Molar gas constant Molére gaskonstante R 8,31 J.K ‘mol Standard pressure Standaarddruk p® 1,013 x 10° Pa Molar gas volume at STP Molére gasvolume by STD Vin 22,4 dm>.mol"™ Standard temperature Standaardtemperatuur ie 273 K TABLE 2: FORMULAE TABEL 2: FORMULES PIVy _ P22 CMa _ Na T, T, cyVp 7 Np pV =nRT K, =[H*][OH"]=107'4 at/by 298 K n= HH = -log(H* M pH = —log{H” | n Een = EF’ oxidising agent ~ E*educing agent c= V E’se1 = EF oksideermiddel - EF reduseermiddel = = ‘6 o 0 a MV E cell = E cathode ~ E anode E° ser = EF’ yatode = E* anode Copyright reserved GAUTENG Please turn over

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Downloaded from hlayiso.com Physical Science/SG/P2 Increasing oxidising ability/Toenemende oksiderende vermoé TABLE 4A: STANDARD REDUCTION POTENTIALS TABEL 4A: STANDAARD- REDUKSIEPOTENSIALE 3 SCE DBE/2013 Increasing reducing ability/Toenemende reduserende vermoé Copyright reserved Half-reactions/Halfreaksies E°/Volt Fo +2e€ = 2F +2,87 H,O02 + 2H* + 2e = 2H,O +1,77 MnO, + 8H* + 5e = Mn** + 4H2O +1,51 Au* +3e = Au +1,42 Ch +2e = 2Cf +1,36 Cr07* + 14H*+ Ge = = 2Cr°** + 7H2O +1,33 Oz + 4H* + 4e = 2HO +123, MnO2 + 4H* + 2e = Mn** + 2H20 +121 pt* +2e = Pt +1,20 Bro +2e = 2Br +1,09 NO3 + 4H* + 3e = NO + 2H,0 +0,96 Ag” +e = Ag +0,80 NOs; + 2H* +e = NOs + H,O +0,80 Hg** +2e = Hg +0,79 Fe* +e = Fe* +0,77 Oz + 2H* + 2e = HO. +0,68 lo +2e = 2r +0,54 SO, + 4H* + 4e = S + 2H,0 +0,45 2H0 +O. + 4e = 40H" +0,40 Cu** + 2e = Cu +0,34 SO,7 + 4H* + 2e = SO, + 2H0 +0,17 Cu** fe Gu +0,16 Sn* fe, She +0,15 S + 2H* + 2e = HS +0,14 2H* + 2e = Hy 10,00 Fe* + 3e = Fe 0,04 Pb2* + 2e = Pb -0,13 Sn?* f200 Shi 0,14 Ni2* +2e = Ni 0,25 Co** at 202.1. .CO -0,28 Ca** +2e = Cd -0,40 Fe** +2e = Fe 0,44 cr* + 3e = Cr -0,74 Zn** +2e = Zn -0,76 2H2O + 2e = Hy + 20H -0,83 Mn** + 2e =. Mn -1,18 Ag +3e = A -1,66 Mg?* + 2e = Mg -2,37 Na* +e = Na -2,71 Ca** +2e = Ca -2,87 sr* +28 Sh -2,89 Ba”* + 2e = Ba -2,90 Cs* +e = Cs -2,92 K* +e = K -2,93 Lit +e - Li -3,05 FIOM UVOU AML AD 0 LA GAUTENG Please turn over

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Increasing oxidising ability/Toenemende oksiderende vermoé Downloaded from hlayiso.com Physical Science/SG/P2 TABLE 4B: STANDARD REDUCTION POTENTIALS TABEL 4B: STANDAARD- REDUKSIEPOTENSIALE 4 SCE DBE/2013 Half-reactions/Halfreaksies E°/Volt Lit ay = -3,05 K* fe 8 «k 2,93 Cs* +e = Cs -2,92 Ba2* +2e = Ba -2,90 srt +2e =. Sr -2,89 Ca** + 26... Ca -2,87 Na* +e = Na -2,71 Mg** + 2e = Mg 2,37 Ag +3e =. Al L1,66 Mn?* + 2e = Mn L1,18 2H20 + 2e = Ho + 20H L0,83 Zn** +2e = Zn 0,76 cr* joc | Gr, 0,74 Fe?* +2e =. Fe 0,44 Ca?* t 260 Cd 0,40 Co** ati. Cy) L0,28 Ni2* +2e€ = Ni L0,25 Sn2* +2e = &n L0,14 Pb2* + 2e = Pb 0,13 Fe* +3e = Fe 0,04 2H* + 2e = He 10,00 S + 2H* + 2e = HS +0,14 Sn* + 2e = Sn* +0,15 Cu** +e = Cur +0,16 So,7 + 4H* + 2e€ = SOQ, + 2H,0 +0,17 Cu** +2e = Cu +0,34 2H20 + Op +4e = 40H +0,40 SO. + 4H* +4e 2 § + 2H,0 +0,45 lo +2e = ar +0,54 O2 + 2H* + 2e = HO, +0,68 Fe** +e = Fe +0,77 Hg?* +2e = Hg +0,79 NO3 + 2H* +e@ = NO, +H,0 +0,80 Ag* +e = Ag +0,80 NO; + 4H* + 3e€ = NO + 2H,O +0,96 Bro +2e€ = 2Br +4,09 ptt acu | Pt +1,20 MnO2 + 4H* + 2e = Mn + 2H,0 +1,21 OQ. + 4H* ely, Are) +123 CreO77 + 14H* + Ge = 2Cr* + 7H,O (+1,33 Cl +2e = 2C6 +1,36 Au** + 3e = Au +1,42 MnO, + 8H* + 5e = Mn + 4H,0 +151 H2O2 + 2H* + 2e = 2H,0 +4,77 Fo #26; ha +2,87 Increasing reducing ability/ Toenemende reduserende vermoé Copyright reserved GAUTENG Please turn over

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Downloaded from hlayiso.com Physical Science/SG/P2 ANSWER SHEET CENTRE NUMBER: EXAMINATION NUMBER: 1.1 A B Cc 1.2 A B Cc 1.3 A B c 1.4 A B c 1.5 A B c 1.6 A B Cc 1.7 A B c 1.8 A B Cc Copyright reserved GAUTENG DBE/2013 SCE D D D D D D D D For the use of the marker D Vir die gebruik van die nasiener D Marks obtained Punte behaal B Marker's initials D Nasiener se paraaf D Marker's number Nasiener D se nommer D (15 x 3) [45]