Physical Sciences Grade 11 P2 KwaZulu Natal June 2017 Memo

at MARKS: TIME: Copyright r Education KwaZulu-Natal Department of Education REPUBLIC OF SOUTH AFRICA ee a eee ee eee eee ee heel REA AEA EAE y PHYSICAL SCIENCE P2 (CHEMISTRY) be COMMON TEST JUNE 2017 ie ae eae NATIONAL SENIOR CERTIFICATE 100 2 Hours This question paper consists of 9 pages, 2 data pages and graph paper. eserved Please turn over amen 1 Rarer aeRO os sdmmiminiaiiiameamnones

Downloaded from hlayiso.com Physical Sciences P2 NSC Common Test June 2017 2 INSTRUCTIONS AND INFORMATION 10. This question paper consists of EIGHT questions. Answer ALL the questions 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 2.1 and QUESTION 2.2. You may use a non-programmable calculator. You may use appropriate mathematical instruments. YOU ARE ADVISED TO USE THE ATTACHED DATA SHEET. Show ALL formulae and substitutions in ALL calculations. Round off your FINAL numerical answers to a minimum to TWO decimal places. Give brief motivations, discussions, et cetera where required. Write neatly and legibly. Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 NSC Common Test June 2017 3 QUESTION 1: MULTIPLE-CHOICE QUESTIONS Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Write down only the letter (A — D) next to the question number (1.1 — 1.7) in the answer book, for example 1.8 D. 1.1. The shape of the SF, molecule is A B Cc D Pyramidal Octahedral Tetrahedral Trigonal Bipyramid (2) 1.2 Aquatic animals obtain their oxygen that is dissolved in water. The type of intermolecular forces that are found between water and dissolved oxygen is called A B Cc D Hydrogen bonds Dispersion forces lon-induced dipole forces Dipole-induced dipole forces (2) 1.3. A thin tube, opened at both ends is placed in liquid A as shown in the sketch below. It is observed that liquid A rises in the tube. } 4 Liquid A The reason for this observation is A B Cc D Liquid A has no surface tension. Liquid A has high surface tension. The adhesive forces are less than the intermolecular forces. The adhesive forces are greater than intermolecular forces. (2) Copyright reserved Please turn over

Physical Sciences P2 Downloaded from hlayis 4 o.com Common Test June 2017 4.4. The behaviour of a real gas is approximately the same as that of an ideal gas under the following conditions of temperature and pressure: Temperature Pressure A. Low Low B. Moderate High Cc. Low High D. Moderate Low (2) 1.5. Acubic container is filled with a gas which exerts pressure p. What will the pressure exerted by the same amount of this gas be if the gas is placed in a cubic container whose side is half of that of the original container? A Ye p B “sp Cc Ap D 8p 4.6 The number of hydrogen atoms in 1 mole of NH4OH is A 5 B 6,022 x 10% C 4x6.022 x 10* D 5x6.022x 10” 1.7 Asolution of HCf has a concentration C. A learner pours 25 cm? of this solution into a 100 cm? volumetric flask and adds water to make a 100 cm® solution. The final concentration of the new solution is: A %C B “C Cc 0,01 ¢ D 4c Copyright reserved (2) (2) (2) (14] Please turn over

Downloaded from hlayiso.com Physical Sciences P2 QUESTION 2 NSC 5 Common Test June 2017 2.1 Given the table below answer the questions that follow: Bond Bond energy Bond Length (k-J-mol) (pm) O-H 463 96 N-H 389 100.8 Cc-C 348 154 2.1.1 Define bond length. 2.1.2 From the data provided, what is the relationship between bond length and bond energy? 2.1.3 Calculate the energy required to break all the bonds in one mole of NHs. 2.2 Hydrogen and carbon atoms react to form methane. 2.2.1 Name the type of bond between the hydrogen and carbon atoms. 2.2.2 Draw the Lewis Structure for CH,. 2.2.3 Calculate the difference in electronegativity between carbon and hydrogen atoms. 2.2.4 Is CH4 a POLAR or a NON-POLAR molecule? Explain. Copyright reserved Please turn over (2) (2) (2) (1) (1) (2) [12]

Downloaded from hlayiso.com Physical Sciences P2 NSC Common Test June 2017 6 QUESTION 3 Learners conduct an experiment to measure the rate of evaporation of three liquids under the same conditions. The learners placed 20 cm? of cooking oil, 20 cm? of water and 20 cm? of chloroform in separate beakers. All three beakers were left exposed for 5 hours. The experiment was repeated 5 times under identical conditions. The average results obtained are shown in the graph below. Volume of Liquid left (cm?) 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Copyright reserved 20 16 Cooking oi! Water Chloroform Define vapour pressure. Write down an investigative question for this experiment. Name a controlled variable. Which substance has the lowest vapour pressure? Give a reason for your answer. Calculate the rate of evaporation of chloroform in cm®.hour”. Is the experiment a fair test? Give a reason for your answer. Chloroform and water are both solvents, but their evaporation rates differ. Explain this observation. (2) (1) (2) (2) (2) (3) [14] Please turn over

Downloaded from hlayiso.com Physical Sciences P2 NSC Common Test June 2017 7 QUESTION 4 A learner investigates the relationship between volume and pressure of an enclosed DIATOMIC gas at room temperature. The following results were recorded by the learner. Pressure (p) Volume (v) | 4(em-) (kPa) (cm’) ¥ 100 50 0.02 150 33 0.03 200 26 0.04 250 20 0.05 4.1 Name the law being investigated. (1) 4.2 Draw a graph of pressure vs 4 on the attached GRAPH PAPER. (4) 4.3 What conclusion could be drawn from the graph in question 4.2? (2) 4.4 Name ONE factor that must be kept constant in this investigation. (1) 4.5 Assume that there is a deviation in the graph at pressures greater than 250 kPa. On the same set of axes show how the graph of pressure vs 1/v will appear at pressures higher than 250 kPa. (1) 4.6 Fully explain the reason for the deviation in question 4.5. (2) [11] QUESTION 5 A gas cylinder containing deodorant (perfume) has a warning that it should not be exposed to excessive heat, as exposure to heat may lead to an explosion. The cylinder can withstand a maximum pressure of 120 kPa. 5.1 Name the law that is described in the above statement. (1) 5.2 The container is stable at 25°C and 101.3 kPa. Determine the minimum ternperature that could lead to the cylinder exploding. (4) 5.3 Will this cylinder explode at 100 "C and 101,3 kPa? Write down only YES or NO. (1) 5.4 Explain your answer to question 5.3. (2) [8] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 QUESTION 6 8 Samples of impure oxalic acid crystals (H2C2O4*2H20) are obtained from the technician Common Test June 2017 of a laboratory. The samples are placed in small packets of 0.350 g each. These samples are used to prepare standard solutions of oxalic acid. 6.1. Define a standard solution. 6.2 One packet of impure H2C204:2H20 was used to prepare a 250 cm? solution. After analysis, the concentration of the prepared solution was found to be 0.01 mol-dm®. Determine mass of H2C204:2H20 in the sample. 6.3 Calculate the mass of the impurities in each sample. 6.4. What is the percentage purity of the used sample? QUESTION 7 (2) (4) (2) (3) [11] Pure CaCOs powder was dropped into a test tube containing a 0,12 mol.dm? HCE solution of unknown volume. The following reaction took place: CaCOxs) + ZHCRaq) > CaCriaq) + COxg) + H2O@ Upon completion of the reaction, it was found that: * 1,146 dm? of COs was produced at STP. * 110 cm? of HC2, with a concentration of 0,09 mol-dm’* remained in the beaker. 7.1. Explain what is meant by an excess reactant. 7.2 \dentify the excess reactant in the above reaction. 7.3 Calculate the number of moles of COz produced. 7.4 Calculate the initial mass of HC2aq) that was present in the test tube. 7.5 5,68 g of CaCO; was added in the reaction vessel to start the reaction. 7.5.1 Calculate the theoretical yield of CO2 in grams. 7.5.2 Calculate the percentage yield of COz. (2) (1) (3) (6) (4) (3) [19] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 NSC Common Test June 2017 9 QUESTION 8 7,5340 g of pure ethylene glycol was analysed and was found to contain 2,9164 g of carbon, 0,7291 g of hydrogen, and 3,8885 g of oxygen 8.1 Explain what is meant by the empirical formula of a compound. (2) 8.2. Determine the empirical formula of ethylene glycol. . (6) 8.3 if the molar mass of ethylene glycol is 62 g-mol", what is its molecular formula? (3) [11] TOTAL: 100 MARKS Copyright reserved Please turn over

Downloaded from hlayiso.com Common Test June 2017 Physical Sciences P2 NSC 10 PAPER 2 (CHEMISTRY) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 11 VRAESTEL 2 (CHEMIE) TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOL/S/IMBOOL VALUE/WAARDE Standaarddruk p 1,013 x 10° Pa Moles gesvolume by STD Ve 22,4 dm'-mot” Moler ges constant. R 8.31 Fi" mot! Standaardtomperatuur r 273 K Avogadro’s Constant N offor Na 6.022x108 mot" TABLE 2: FORMULAE/TABEL 2: FORMULES cet PiVi _PoVe Vv T, = Tp nso orlof pV=nRT m C= ee MV Copyright reserved Please turn over

4OAO UN} BSeeid pemesel 1yBuAdog sez zez 71 | ON PW WA 83) 50 49 wo wy nd dN neg) UL ol | 2Oh | FOL | oo | 66 | 86 | 46 | 96 | S6 | ve | c6 | ze Le | (Og Sit | €£b | 69L | LOL | SOL | €ob | ESE | zoL | zoL > osL ve | beh | OF MT) GA) WE 4a) OH Ad | at PD) ng wg) wd) PN dd | a9 ozz te | 04 | 69 | 89 | 49 | 99 | 9 | oo ~~ es | zo | i9 | 09 || 6s | gg oy ey S44 68 EY zg soe 402 = v0e = Loz sf 46l /S6b Z6b [ost 698: [yar [ier [elt eel zen cer Wa We Odd '8oddeaLe5H nv jd 41 sO eu MeL JH 5/PT Ba gso§ 98 | S8 v8 i288 (78 | te 08 |e jee ek ioe isk iw lee ol os 9¢ gs bel deb | 8b ject GLE Sib zit for [aor €or | tor 96 | Zé | 16 | 68 88 98 xX | | FPL as giuss ul 5/P9 5 By 2 Pd 8 ua 8 ny 8 91 Sows) aN ZR A HAS FMS vs i(€§ (% (ts (0s 6h | sy | (oF (Se by ice oz |i oo | ee ge Ze re 08 | SA SA fh | OL so Seo es «| es =f os = Gg es ist ee ep on ee dy Bee ae ae a UZ BNO SIN 2/00 Sad suns 49 As iLaISeeosgu gs a 9€ Se ve ee ce Le oe 6z 8 Ze ETA ve 74 (44 Le 0z 6L Downloaded from hlayiso.com OF g‘ge ee LE 82 L2@ DSSDUILIOOID aMmaliDjas apsapouag ve ee ivy 308 g Nis slave ; sseur d107e oanery ayeunxoiddy - | BI SEN $ SL Lb QL SL PL eb (4 LL Jooquiis oz [6b | or |e ab | ut —¥ ei umponouownels 6 Z ON 3 2 ag Rigs loquids te © AyaneSsu029913 sans OL 6 8 Z 9 i] v € 7 4 1 aH daquinu siwory TALNIIS/AIN HX 4 L (mA) (ia) A) (A) (Ds (u) () 8b od OL Sb oH eL ZL tb OL 6 8 2 9 S$ v € z L S.LNSW3 13 AO A1EVL DIGOMAd SHL ATavi LL ZL0Z eunr jsaj uouWOD OSN @d seouaing jesiskyd

Downloaded from hlayiso.com

PHYSICAL SCIENCES ANNI OSA B A, From Blaises On: 2017 NAME: AASHS 440 — YUVAL Copyright reserved

Downloaded from hlayiso.com

Downloaded from hlayiso.com 49A9 wINg eseeig Pensoy wBukdog [21] “adeys ul |espeyeney Ss! +H YO {z) ST einsajow aly ing Jejod ele Spuog H—D‘- 1ejod-uoy -y'z"z (L) /fOVO=LZ-GZ=NAV 7S H H:O:H cs H (2) tz 0) PPUOGIURIENCD LTT Co (2) AHOWPHLOL | = PBBEXE = (H-N)x€= HV EL /A/ SoSe5 ui ABISUS Puog yy Jo (0.10 z) 7 S8SPS Sp ADISUS PUCF oy SSSESIOUI WUD] pug ay) se Zh'z {Z)_»,Swioye pepuog om} Jo fe;ONU Buy Udamjeq souR}sIp eBerene auy s1 yyBUS| puog 442 Z NOLSaND feu @) PAW OLE (2) cred Ob (2) ya St (2) cea vt (2) read eb (2) cra tb (2) cra vb | NOLLSND OUISPING BuPHeW 1) @PeD-OSN z 3891 uoUWIOD /10z euNE Za aouaing jeaIshyg TEAQ Win] S8eaId POAISSSY TYDIAGOD “saBed g jo s}sisuoo auljepin6 Gupyew siyt “g'N sanoy Z 2 SWWIL OO ‘SHV ALVOldILYaS YOINAS TWNOILVYN ofS SSSR SSSR SSREER SSSR ESS GaSSSRHeee RSE ESE EES, “ESS NOWWOD ZLo¢ SNOr ANITAGIND OND ee OR RRR RE RE ERE Sr ad ‘@d FONAIOS WWOISAHd Seer nese ees eee eee eee ee eet 4 ¢ Vvold¥sv¥ HLNOS JO ONaNndsaY uoneonps jo Jusuiedag jeyeN-ninzemy uoneonpy

Downloaded from hlayiso.com Physical Science P2 3 dune 2017 Common Test NSC-Grade 11-Marking Guideline QUESTION 3 3.1. Vapour pressure is the pressure exerted by the vapour at equilibrium with its liquid in a closed system” “ (2 or 0) 3.2 How does the nature of a liquid affect the rate of evaporation? “V (2) OR Whats the relationship between different types of liquids and the rate of evaporation of these liquids? ““ (one mark for identifying the two variables, and one mark for framing it into a question). 3.3. Volume “ or Temperature or Atmospheric pressure. (1) 3.4 Cooking oil”, it does not change into vapour easily” (2) 3.5 rate = Av at 7-20 oe 2) 3 @) =-2,6 om* hr v 3.6 yes v’, only one variable was changed” (2) 3.7 Water is held by strong hydrogen bonds” while chloroform has weak dipole-dipole forces / van der ces. i (3) [14] Copyright Reserved Please Tun Over Physical Science P2 June 2017 Commen Test 4 NSC-Grade 11-Marking Guideline QUESTION 4 41 Boyle's law” (1) 4.2 — Figure 1: Graph of pressure vs inverse of volume (4) Marking Guide 0,05 € Axes: Correctly lebolle, 5 ove appropriate scale , 2 Starting from origin 5 003 8 Shape: Straight fine¥” Bd 0.02 Points plotted correctly 2 @ oot £& 4.3 Pressure is inversely proportional to the volume.” ¥ (2) OR The inverse of volume is directly proportional to pressure. Vv” 4.4, Temperature” / Quantity of gas or number of moles of gas OR mass of gas. (1) 4.5 onthe Graph sheet” (1) 4.6 Athigh pressures, the volume of the gas is reduced. Increasing the pressure further does not result in a decrease in the volume, “ as predicted by Boyle’s Law, because the space occupied by the particles themselves cannot be ignored. ¥ (2) [1] Copyright Reserved Please Tum Over

Downloaded from hlayiso.com 4OAQ wun eseeiq, (9) 78 880'r AGE x ZLLO Watt low 2140 70L0'0 + ZOL'O So]OWW SSeOxe + peyoerel yey} sejow JOW OLO'O = AOLLO X 60'0 PAXD = “PERS! IOH 40 OW ZOL'O (e) () (0402) —_»,» “syjoees yey) Nowe up UeY} 1a}2aJ6 si jUNOWe peniesey 1ySuxdos, = 30H JO ssew jentuy = JOH Jo sojow jeniuy SS8OXO UL JOH JO |OW JO ON, =ZLSOO XT “A si9|duloo s| uoRoeel oly Joye Yo} S| JeLR JULIO! Jeu) SI JURDeEI SseOxy SUIIEPIND BurpeW-]} epe1s)-ISN 789 uounuog J Loz eunp 9 L ca 209 IOH :oney HL 7 low Z1S0°0 = 4 yee a wy v —su A eL DOH ZL legiu! ssoym jueyeRe, yey | le} ve ZNOLLSAaND %d souets jeo1shud (0402) JOAQ WIN] SSB3\q ta3) () (2) (v) fg] (2) (1) (v) () 32 YOUN 410% OuNE Paaiesey 1ybuAdog, 7 %06= ose‘o * %00LX sourjsqnseindujo sseu soueisqnseindyossew sito = Aundy, ro 78 S€0'0 = -SL€'0— 0SE'0 = Sonuindu jo ssew gg / Bere‘o=w * 0G2'0X 921 Ww “~ 00 =o rT eg A/Kasioaid UMOUy S! UoRe.NUeOUO eSOYM UO]NJOS & Ss! UOANIOS psepuRIs yO 9 NOLLSAND @pojdxe pjnom sepuyjéo ayy sousy , nm Loese= 1 pL 96% eOLXOZL -A,OLxE° LOL Ze 0g Te PME} S21 SuyEpIND Burpey-}) SP2IO-OSN g SunjesodUis} WNW Sty UelR TREOIB si_~ VETS (001+E2Z) eamesodwigy ayy yg 7SPAR EG \ cs essnz-AeQ 1G SNOILSAND @d souaig eo1sAyg

Downloaded from hlayiso.com Physical Science P2 7 NSC-Grade 11*Marking Guideline 754 n= M _ 5.68 ~ 100 =0.0568mol Ratio CaCOz : COz 4 : 1 0.0568 mol (theoretical) ” m = nxM = 0.0568x44 ¥ = 24992 gv 75.2 actual %yield = ————- x 100% oye = theoretical * ae 2.25 ( = x 100% 2.4992 an =90.03% v Copyright Reserved June 2017 Common Test (4) @) f19] Please Turn Over Physical Science P2 & NSC-Grade 11-Marking Guideline June 2017 Common Test QUESTION 8 8.1 An empirical formula is the simplest atomic ratio of a molecule” (2) 82 Option (6) Cc in {e) Mass (9) 2.9164 | 0.7291 3,8885, Molar mass (g-mol) 12 dv 16 7H = = (mol) ylmod 0,24303¥ | 0.7201v ‘| 0,24303 Ratio 1 3v 1 Empirical formuta is CH3O“ OPTION 2 Cc H fe} Percentage (%) | 38.7097 9.6774 51.6129 Mass (g) 38.7097 9.6774 51.6129 Molar mass 12 1 16 x (g.mot*) = = (mol) M 3.2258 ¥ | 9.6774v | 3.2258 Ratio 1 3 1 a Empirical formula is CH30” 8.3 M Molecular formula = integer <M empirical formula (3) 62 = integer x (12+16+3x1) Vv Therefore: integer = 2” Molecular formula = Cz2HeO2¥ 11] Copyright Reserved TOTAL MARKS: [100]