2017 Chemistry P2 KZN hlayiso.com

Downloaded from hlayiso.com Education KwaZulu-Natal Department of Education REPUBLIC OF SOUTH AFRICA. NATIONAL SENIOR CERTIFICATE TIME: © 3 hours MARKS: 150 This question paper consists of 16 pages including 4 data sheets and 1 answer sheet.

Downloaded from hlayiso.com Physical Sciences P2 Preparatory Examinations - September 2017 2 NSC INSTRUCTIONS AND INFORMATION 1. Write your centre number and examination number in the appropriate spaces 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 2.4 and QUESTION 2.2. , 6, You may Use a non-programmabie 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 calculations. 10. Round off your final numerical answers to a minimum of TWO decimal places, ° 11. Give brief motivations, discussions et cetera whére required. 12. Write neatly and legibly, ropyright reserved Please turn nvar

Downloaded from hlayiso.com ’ Physical Sciences P2 . 3 Preparatory Examinations - September 2017 NSC QUESTION 1: MULTIPLE CHOICE Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Write only the letter (A - D) next to the question number (1.1 — 1.10) in the ANSWER BOOK, for example 1.1 D. 41 Which one of the following organic compounds contains a carbonyl group? A Haloalkanes B Alkanes Cc Alcohols D Aldehydes (2) 1.2. Which one of the following reaction types represents the conversion of ETHENE to CHLOROETHANE? A Substitution B Hydrohalogenation Cc Dehydrogenation D Elimination ; (2) 1.3 In which one of the following reaction types is methyl methanoate formed? A Esterification B Hydrolysis c Dehydration - D hydration (2) 1.4 50 cm? of 20,1 mol.dm® solution of hydrochloric acid is poured on to 5 g of magnesium powder inside a small test tube at room temperature. Which one of the following factors will increase the rate of this reaction? A Using 100 cm® of a 0,1 mol.dm® solution of hydrochioric acid at room temperature. B Using 5g of magnesium ribbon. a Decreasing the temperature of the acid solution to 10°C D Increasing the temperature of the acid solution to 80 °C (2) Copyright reserved Please tum over

1.5 1.6 Downloaded from hlayiso.com Physical Sciences P2 4 Preparatory Examinations - September 2017 ~ NSC urine’ of riotecidé’- The temperature of the mixture is now increased to 500 °C. Which ONE of graphs A to D represents the distribution curve of the mixture at this higher temperature? : A A B B c Cc D D (2) A mixture of SO, gas and OQ, gas was placed into a closed container at 300°C. with a small amount of V20s. : 280.19) + 0.49) = 280,(g) At certain times, various changes in the physical conditions applicable tothe reaction or to the chemicals themselves, were made. ' The graph below fepresents the rate of reaction against time. Reaction Rate 8 EJ a oo nz «a Time (s) ; Which otie of the changes below explains the change in the graph at 20 s? A Decrease in pressure. B Increase in pressure. c Decrease in temperature. D Addition of a catalyst. (2) opyright reserved Please turn aver

Downloaded from hlayiso.com Physical Sciences P2 5 Preparatory Examinations - September 2017 17 1.8 1.9 NSC Consider the ionisation reaction below: H2SO,(aq) * H,0() = HSO, (aq) + H,0* (aq) A conjugate acid-base pair is: A H,SO, ; HSO; B H,SO, ; H,0° c H,SO, ; HO D HSOz ; H;07 (2) During the electrolysis of a concentrated sodium chloride solution, water is reduced and not sodium ions because... A Na’ is a stronger reducing agent than H20. B Na‘is a stronger oxidising agent than H,0. Cc H,0 is a stronger reducing agent than Na’. D H,0 is a stronger oxidising agent than Na”. (2) A solution of copper (iI) chloride (CuCl) must be stored in a metal container. Which one of the following metals should ‘be used? A Ag B Zn Cc Mg D Fe (2) Which one of the following fertilizers provides the least nitrogen per mole of fertilizer? : A Ammonium phosphate B Ammonium nitrate Cc Potassium nitrate D Calcium nitrate (2) [20] Copyright reserved Please tum over

Physical Sciences P2 Downloaded from hlayiso.com 6 NSG QUESTION 2 (Start on a new page.) The letters A to F in the table below represent eight organic compounds. A a B -CH3COCH,CH,CH; HCH Ha c but-2-ene H-0-0-6-G-¢-G-4 DB CHCCH,CH, nfs 4 Br Ae E _ 3-chloro-3-ethyiheptane H-C-H F CH,COOH H > 2.1 2.2 2.3 2.4 2.5 2.6 Write down the IUPAC name of compound A. - Write down the general formula of the homologous series to which compound - C belongs. Write down the structural formula for compound E. Write down the name of the functional group to which compound D belongs. . Draw the structural isomer for compound F . Write down the name of the homologous series to which compound B - belongs. ’ QUESTION 3 (Start on anew page.) Learners investigate the evaporation of ethanol, ethanal and ethanolic acid. They place 2 ml of each of the liquids in a watch glass. They then observe the change in the volume of the liquids. : . : @ ETHANOL ETHANAL ETHANOIC ACID 3.1. Which one of the above liquids would have the largest volume after 10 mins? 3.2 Give an explanation for the answer to QUESTION 3.1. 3.3 Which one of the liquids will have the highest vapour Pressure after 10 mins.? 4.4 Give an explanation for the answer to QUESTION 3.3. opyright reserved Preparatory Examinations - September 2017 (2) ) @) (1) 2) (1) [10] (1) (3) (1) (3) [3] Please turn over

Downloaded from hlayiso.com Physical Sciences P2 7 Preparatory Examinations - September 2017 NSC QUESTION 4 (Start on a new page.) The flow diagram below represents various organic reactions. Study the reactions and answer the questions that follow. fn 0-H HCI a i i ; a i [9 gi [HG -E=C-H] I |y-0-G--H HHH 41 State the reaction condition required for reaction I 4.2. Write down the formula of the catalyst used in reaction I. 4.3 Propane reacts with excess oxygen. Write down a balanced equation for this reaction using molecular formulae. : 44 Use structural formulae a write a balanced equation for reaction II. A structural isomer of the product of reaction Tis reacted with butanoic acid, to form an ester. 4.5 Write down the name of the catalyst used in this reaction. 46 Write down the structural formula of the ester that is formed. 47 Name the ester that is formed Question 4.6 QUESTION 5 (Start on a new page.) Ethene is used as a monomer in the preparation of a macromolecule, polyethene. 5.1 Define a macromolecule. 5.2 Name the process by which polyethene is manufactured. 5.3 Write down the structural formula for the monomer used to prepare polyethene. (1) (1) (3) (3) (1) (2) (2) [13] (2) (1) (2) [5] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 . 8 Preparatory Examinations - September 2017 NSG QUESTION 6 (Start on a new page.) in investigating the factors that affect the rate of reaction, some learners react calcium carbonate with excess dilute hydrochloric acid, in a conical flask. The apparatus is setup as shown below. The change in mass of the conical flask and its contents are recorded every minute. The results for this investigation are shown in the tabie below. [Time (s) 0 41 2 3 4 5 6 7 8 9 Mass of flask and its contents (g)| 178 |176,2)174, 1172,71172,3H 72,21 72, 1/172, 1 72, 1/1 72,1 6.1 Write down an investigative question for this investigation. (2) 6.2 State the independent variable for this investigation. (1) The above table is re-drawn in the special answer sheet provided: 6.3 Complete the table by filling in the values for the mass of CO, produced. : (2) 6.4 Plot a graph of mass of CO, produced vs time elapsed. (5) 6.5 Give a reason why the mass of the flask and its contents remains constant after 6 s. (1) 6.6 Calculate the total volume of CO, (g) produced at room temperature (25 °C). Assume the molar gas volume of CO, (g) at this ; temperature is 24,46 dm*.-- (3) _ The experiment is now repeated at a higher temperature. The volume and concentration of the HCl and the mass of CaCO, used are the same as in the original investigation. 6.7 On the same system of axes used to draw the graph in QUESTION 6.4, draw a sketch graph of mass of CO, produced vs time elapsed, at the higher temperature. Label this graph as N. (2) 68 Use the collision theory to explain the difference between the two graphs obtained. : . (3) [19] i Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 9 Preparatory Examinations - September 2017 NSC . QUESTION 7 (Start on a new page-) Ten (10) grams of hydrogen gas and 355 g of chlorine gas are heated together in a sealed 500 cm? container. Equilibrium is reached at 450 °C. Hz (g) + Ch(g) @ 2HCI(g) ; 4H<0 | The equilibrium constant for this reaction at 450 °C is 60. TA Calculate the mass of chlorine gas present at equilibrium. (10) The temperature is now increased to 550 °C while the volume is kept constant. The system reaches a NEW equilibrium. 7.2 State Le Chatelier's principle. : (2) 73 How will the following be affected in this new equilibrium? Write down only INCREASE, DECREASE or REMAINS THE SAME. 7.3.1 The equilibrium constant. ” ; , (1) _ 7.3.2 The volume of H2 present. . » (A) 74 Use Le Chatelier’s principle to explain the answer to QUESTION 7.3.2. » (2) [16] QUESTION 8 (Start on a new page.) 8.4 Concentrated hydrochioric acid with a concentration of 10 motdm’ is diluted to form $00 cm? of a 0,25 moldm’ solution. 8.1.1. Is the diluted hydrochloric acid a strong acid or a weak acid? (t) 8.1.2 Calculate the volume, in cm’, of the concentrated hydrochloric acid that must be used. ; a (5) 8.1.3 Calculate the pH of the 0,25 mokdm”™ solution of HCI. (3) 8.2 Calcium carbonate forms a large percentage of sea shells. In order to - determine percentage purity of the calcium carbonate in sea shells, learners react 5 g of powered sea shells with the 500 cm? of the diluted hydrochloric acid prepared in QUESTION 8.1. The reaction that takes place is represented by the following balanced equation. CaCOs (s) + 2HCI(aq) ——? CaCl, (ag) + H,0(). + COz (9) The excess HCl is then titrated with 140 cm? of a 0,2 mokd m solution of sodium hydroxide. , 8.2.1 Calculate the mass of CaCO, present in the sample of sea shells. (8) 8.2.2 Calculate the percentage purity of the caicium carbonate in the in the sea shells. ; : (3) [20] Copyright reserved . Please turn over

Downloaded from hlayiso.com Physical Sciences P2 — 10 Preparatory Examinations - September 2017 - . NSC : . QUESTION 9 (Start on anew page.) 94 An 800 m athlete, was recently placed first in an international event after the original winner was disqualified. This athlete was required to return the silver medal and receive a new gold medal. When the silver medal was returned it . had scratch marks. The following apparatus was setup to coat the medal with a thin layer of silver, Electrode P : ; ——Silver Meat L J — AgNOs solution 9.1.1 Will the medal be the anode or the cathode? . , (1) 9.1.2 State the direction in which the current must flow in the external _ : circuit. (State from silver medal to P or P to silver medal) (1) 9.1.3 The concentration of the electrolyte solution (AgNO) remains . : constant during the process, Briefly explain why this happens, (2) 9.1.4 Give the symbol for the metal that must be used as electrode P. po (4) - 9.2 An electrochemical Cell is setup under standard conditions as shown below. O- Y Salt Bridge Cu CuCl, 9.2.1 State the Standard conditions that are applicable to this cell, (2) 9.2.2 State the energy conversion that takes place in this cell, (1) 9.2.3 State two functions of the salt bridge. (2) 9.2.4 Use the information given to identify the metal Y. Show all calculations. (6) : 9.2.5 Write down the oxidation half reaction. (2) 9.2.6 Write down the cell notation (symbolic notation) of this cell, (3) apyright reserved Please turn aver

Downloaded from hlayiso.com Physical Sciences P2 . 141 Preparatory Examinations - September 2017 NSC - Some silver nitrate (AgNO,(aq)) is added to the Cu half-cell. 9.2.7 Howwill the reading on the voltmeter be affected? Write down INCREASE, DECREASE OR REMAIN THE SAME. (1) 9.2.8 Give an explanation for your answer in QUESTION 9.2.7. (3) [24] QUESTION 10 (Start on a new page.) 10.1. The flow diagram below shows two industrial processes that result in the production of a fertilizer, X. . 7 Process A Process B “Ny H, |* NH, Step 11.0, NO Step 2| 0. NH, 5. NO, Siep3 a - HNO, x 40.1.1 Write down the name of Process A. (1y 10.1.2 Name the method used to obtain the Nz (g) used in Process A.- (1) 10.1.3 Write down the name of Process B. (1) 10.1.4 Name the catalyst used in Step 1 of Process B. (1) 10.1.5 Write down the formula of the other reactant in Step 3 of Process B. (1) 10.1.6 State two reasons why it is necessary to manufacture fertilizers on an , industrial scale. (2) 10.1.7. Give the name of fertilizer X that is produced. (1) 40.2 The following information is found on a 50 kg bag of a fertilizer that you purchase for your lawn. : 22: 10 : 18 (22) 40.2.1 What information can you obtain from these numbers? (2) 10.2.2 Calculate the percentage composition of the nutrients in the bag. (3) 10.2.3 The number 18 in the ratio above represents a particular element. Briefly discuss the role this element plays in the development and growth of plants. (2) [15] TOTAL : 150 Dlaace turn aver

Downloaded from hlayiso.com Physical Sciences P2 12 Preparatory Examinations - September 2017 NSC : “DATA FOR PHYSICAL SCIENCES GRADE 12: PAPER 2 (CHEMISTRY). : GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12. VRAESTEL 2(CHEMIE) . ' TABLE 1: PHYSICAL CONSTANTS/TABEL " FISIESE KONSTANTES NAME/NAAM _ SYMBOL/SIMBOOL. | VALUEIWAARDE ye o Molar gas volume at STP : co. Biemapte o.! Molére gasvolume by STD Mm 22,4 dm mor _ Standard temperature , : : Standaardtemperatuur . T. r 273K Charge on electron : ; : an Lading op elektron e | 16x 10°C Avogadro's constant - ; Na” Jf: 6,02x 4102 moi . Avogadro-konstante "TABLE 2: FORMULAEITABEL 2: FORMULES® m N- n=— n=— - M~. A n _om c=— ovof = ¢=— h=— Vv Vv hy Can Pe =4 Ky = {HO"JOH] = 1 x 10 atfby 208K) ar ena Eten = Ecainede ~~ ESnoge ff = Eads — ESnode orlof en . an = Eduction ~ Eeowication / ea =a ~ Eedcats orlof =a = Ee ctsiogagent — FER ewcing agent i Ee, = E ctdeormici 7 EE ctuccormidant Copyright reserved Please turn over

Downloaded from hlayiso.com Preparatory Examinations - September 2017 13 NSC Physical Sciences P2 geez zee: 1 | on | pA | wa | Sa | Jo | 4a] WO PUY | Ad dN jon | ed | UL cor | zor | vor | oor | se | &6 | ze | 96 | 96 | $6 | 86 | 26 j 16 | 06 cab | cab | 69 | 29% | S9b | ESF | GSt | Zab | Zab | Ost vob | -Lvb | Opb ny | gk | wi| 4a] OW | Aa | aL | PD | Ma | WS | Wd | PN | 4d | SD se uw | o | 69 | 83 | 29 | 99 | 99 | vo | co | zo | +8 | o9 | 69 | 88 oy ley gl 44 2 : 68 8 Za Boe Hoe POE woe et Ser [zor [ost feet Tver [ver [ect [eer | Leb | Ee uy [Iv Sod Sig slddaiala BH [ny | 4d ay iso jeu |; M Jel [JH a) PT | Pa giso & og ise |e (ee (ze [te [os jee | oe _ [ee loc [ee | be | 2 | ee ig 9g gg lel | ze |ezh|ezb jert [Sit |ztr [sor j9or [cor | FOL 06 | ze |e | 68 a8 98 3X POL LAS TUS s ul =] po 2} Sv 2 Pd 2) 4a 8) We 8) OL a) OW GIN 4Z A dl4s sjqa sé rs oles) tz lis [os |e [er | er [oy ise |e [ey |e | w | oF ee__| ge ie pe Tee Teh eh) en p 0k | so steo [os [es jos |se [ze | is | er | ov OF 6e Mm |4asles kisv sep geos uz 2/9 Z| IN 2/09 2) 84 SUAS 93 Zl LL #)°S SlBO s| y S oe {se ive lee [ze [re loc joe [se [ee |oz [oz [re |e i 22 | be 0z 6h or [ssc | ze we | Bf | 48 BSseuNUOO}e eMefese/ Eplepeusg “9 &% iw 130s Mad Ris sea Sse o]wozR aAqeios aeUXouddy: BIN Z| eN & 8b 2b [gb | Sb | eb | Eb - Ll ZL bb oz | 6h [or | eb th | bb ; 6 i oN 2)0. $)N 8 9B) 4 &). jooquuis ao youmpeabauo.nyely eq als ob 6 8 Z 9 ¢ joquigs > © AyaneBaues99/3 ¥ ¢ ¥ 1 | T H 3 z peyeucoy TALNA ISIN l ; . soquinu o[Wwoyy a. a tA ww ww . 77) i} ra | | | a 4 6 8 L EY s ” ¢ z L N3W3 12 NVA T38Vi SNACOMAd FIC *¢ TIVL SLNSWATA AO ATAVL OIGOMad SL ef a1avl Please turn over

Downloaded from hlayiso.com Physical Sciences P2 14 Preparatory Examinations - September 2017 NSC TABLE 4A: STANDARD REDUCTION POTENTIALS TABEL 4A: STANDAARD-REDUKSIEPOTENSIALE Half-reactions/Halfreaksies | £9 (yy Fo(g)+2e = OF + 2,87 Co*+e = Co + 1,81 H2O2+2H*+2e" 2x -2H2O 41,77 MnO +8H*+5e = Mn%4+4-bO + 1,51 C&(g)+2e 2Ct +136 | COZ +14H*+6er = C+ THO | +433 O2(g) + 4H*4+4e7 = 220 + 1,23 MnO2+ 4H*+2e- =) Mn?*+2H20 +1,23 A Pt? +2e pt + 1,20 Br(t)+2e = 2Br + 1,07 NO, +4Ht+3e & NO(Q)+2H20 | +0,96 oe Hg*+2e- 2. Ha( +085 & ‘% Agtte = Ag +0,80 g E NO; +2H*+e" 2 NO2g)+H2O | +0,80 @ g Fe +e 4 Foe +0,77 z g O2(g) + 2H* + 2e- = H2O2- + 0,68 s Ss Ib+2e = ar + 0,54 g 8 te 3 o Cut+e7 = Cu + 0,52 o Rs; S02+4H*+4de- = S +210 + 0,45 3 £ 2H20 + 02+ 48" wa 4OH- +0,40 3 ® Cu*+2e = Cu +0,34 a ; g SOS +4H*4+2e 4 SO2(g) +2H20 | +0,17 4 = Cu*+e = Cut + 0,16 8 2 Sn*+2e- =. Sn + 0,15 BK $ S+2Ht+2e . HeSig) +0,14 Fy Led 2H*+2e = Hag) 0,00 5 = Fe*+3e 2 Fe — 0,08 s 4 Po +2e- = Pb -0,13 2 o Sn*+2e = Sn -0,14 g & NP*+2e- Ni ~ 0,27 3 2 Co**+2e- = Co - 0,28 m *® Cd*+2e = Cd - 0,40 £ ha Ch+e «Or - 044 9 £ Fet*+2e = Fe - 0,44 2 8 Cr +30 Or -0,74 £ £ Znt**2e- ws Zn -0,76 £ 2H20 + 2e- Hog) +20H- | -0,83 Cr 4+2e- Cr -0,91 Y Mn? +2e- = Mn - 1,18 ABY4+3e° AL - 1,66 Mg**+2e- = Mg — 2,36 Nat*+e = Na -2,71 Ca%+2e =. Ca — 2,87 S+2e 2 Sr -2,89 Ba’*+2e =. Ba - 2,90 Cst+e = Cs - 2,02 Kee a K -2,93 litte 2 LU ~3,05 Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 15 Preparatory Examinations - September 2017 NSC TABLE 4B: STANDARD REDUCTION POTENTIALS TABEL 4B: STANDAARD-REDUKSIEPOTENSIALE Half-reactions/Halfreaksies | £9 ( litte = Li -3,05 Ktte ae K ; = 2,93 Cst+e = Cs - 2,92 Batt+2e =. Ba | -2,90 Se+2e = Sr 2,89 Cat+2e = Ca ~ 2,87 Natte = Na ~2,71 Mg? +2e- = Mg ~ 2,36 ABt+3e = At - 1,66 Mn2?*+2e7 = Mn (1,18 Cet+2e = Cr ~ 0,99 2H2O+2e = He(g) +20H- — 0,83 Z+2e = 2n - 0,76 A Cr++3e- = Cr ~0,74 Fet+2e Fe - 0,44 Cette =a cre -0,41 Cd*+2e = Cd - 0,40 Cot+2e = Co” -0,28 Ni*+2e7 = Ni >| -0,27 Sn+2e = Sn - 0,14 Pb2*+2e = Pb - 0,13 Fe+3e = Fe — 0,06 2H*+2e Hag) 0,00 S+2H'+2e «= H2S(g) +0,14 Sn +2e = Sn - +018 Cu*+e = Cur + 0,16 so = +4Ht+2e = SOxg)+2H20 | +0,17 Cut+2e = Cu + 0,34 2H20+O2+4e7 = 40H" + 0,40 SOz+4H*+4e7 == S+2H20 + 0,45 Cuit+e = Cu : + 0,52 l+2e-° = 2b +054 Oalg) +2H*+2e- = H202 +068 | . Fe*+e- = Fer +0,77 NO; +2Ht+e = NOxg)+H20 + 0,80 Agt+e = Ag + 0,80 Hg#*+Ze = Had) + 0,85 NO} +4H*+3e = NO(g) + 2H + 0,98 Brof}+2e7 = 2Br . +1,07 PR+2e = Pt +1,20 | MnO2+4Hi+Ze° = Mn +220 + 1,23 O2(g)+4H*+4e7 = 2H20 +4,23 Cn02 + 14Ht+6er = ACI THO | +1,33 Ch(g)+2e7' = 20h +1,36 . MnOg +8H'+5e a Mn’ +40 | +1,51 H2O2+2Ht42e7 = = 2H20 +41,77 Cot#+e = Cort +1,81 Fo(g)+2e° = 2F- +287 Please turn aver

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Downloaded from hlayiso.com | Physical Sciences P2 . . wse Preparatory Examinations - September 2017 | | Name: ! Answer sheet Q6.4 and Q6.7 [Time (s) oOo}; 1 2 3 4 5 6 7 8 9 Mass of flask and its contents (g)| 178 [178,2{174,11172,7[172,9172,4072,1[172,1172,1 72,1 Mass of CO, (g) produced (g) EASE TEAR, ON DOTTED LINE er PL —— ee