Physical Sciences Grade 11 Gauteng June 2022 QP (Eng)

Downloaded from hlayiso.com PROVINCIAL EXAMINATION JUNE 2022 GRADE 11 PHYSICAL SCIENCES (PHYSICS AND CHEMISTRY) TIME: 2 hours MARKS: 100 10 pages, 3 data pages and 1 formula page P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES 2 GRADE 11 INSTRUCTIONS AND INFORMATION 1. Write your name in the appropriate space on the ANSWER BOOK. 2. This question paper consists of FIVE 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. 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, where required. 12. Write neatly and legibly. P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES 3 GRADE 11 QUESTION 1: MULTIPLE-CHOICE QUESTIONS 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 1.11 A. 1.1 Two small identical objects, each with a net charge of -Q, are placed next to each other in a vacuum tube. They move apart. Which of the following statements is CORRECT? The electrostatic force will ... A decrease at a constant rate. B decrease exponentially. C stay the same. D increase at a constant rate. (2) 1.2 Two identical point charges A and B, having charges of –3pC and +9pC respectively, are allowed to touch and then moved apart. The charge in pC on each sphere is now ... A B A +3 –9 B +3 +3 C –3 –3 D 0 0 (2) 1.3 An electric field strength created by charge Q is measured to be 40 N.C-1 at a distance of 0,2 m from the center of the charge. What is the new field strength when the distance from the center of Q is changed to 0,4 m away with twice the charge of Q? A 3 200 N.C-1 B 1 600 N.C-1 C 800 N.C-1 D 20 N.C-1 (2) P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES 4 GRADE 11 1.4 P and Q are two electrostatically charged bodies. If the electric field pattern between them is as shown below, then … P Q A P and Q are both negative. B P and Q are both positive. C P is negative and Q is positive. D P is positive and Q is negative. (2) 1.5 The type of intermolecular force involved when CO 2 is added to water vapour is: A Ion-induced dipole forces B Dipole-dipole forces C London forces D Dipole-induced dipole forces (2) 1.6 Refer to the list of substances below. HCl, Cl2, H2O, NH3, N2, HF Select the TRUE statement from the list below. A NH3 is a non-polar molecule. B Ion-dipole forces exist between molecules of HF. C The melting point of NH3 will be higher than for Cl2. D At room temperature N2 is usually a liquid. (2) P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES 5 GRADE 11 1.7 Balance the following equation using minimum integral coefficients: NH3 + O2 → NO2 + H2O The stoichiometric coefficient for oxygen gas (O2) is: A 1 B 4 C 3 D 7 (2) 1.8 Two moles of H2 gas at STP occupy a volume of: A 44,8 dm3 B 22,4 dm3 C 11,2 dm3 D 2 dm3 (2) 1.9 Which of the following statements is TRUE? I. The molar mass of CaCO3 is 100 g mol−1. II. 50 g of CaCO3 contains 9 ×1023 oxygen atoms. III. A 200 g sample of CaCO3 contains 2 moles of CaCO3. A l only B II only C III only D I, II, and III (2) 1.10 1,50 mol of SO2 and 1 mol of O2 are sealed in a 1 dm3 flask and allowed to react completely at STP according to the following balanced equation: 2 SO2 (g)+ O2 (g) → 2 SO3 (g) The total number of moles of gas in the flask at the end of the reaction is: A 2 B 1,75 C 0,75 D 0,25 (2) [20] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES 6 GRADE 11 QUESTION 2 (Start on a new page.) Two identical negatively charged spheres, A and B, both with a mass 0,15 g, hang from the same point by thin, inextensible strings (mass of the strings can be ignored). The electrostatic force between the spheres causes them to move 20 mm apart. The angle between one of the silk threads and the vertical is 6,99°. 0,15 g 0,15 g 2.1 Define Coulomb’s law in words. (2) 2.2 Draw a free body diagram of all the forces acting on sphere A. (3) 2.3 Use your answer to QUESTION 2.2 to calculate the magnitude of the force to the left on A. (4) 2.4 State Newtons third law of motion in words. (2) 2.5 Calculate the charge on both QA and QB. (4) P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES 7 GRADE 11 2.6 In a different scenario, A and B are two identical, negatively charged small spheres with a mass of 5 g. A is mounted on an insulated stand and B hangs from a light silk thread. The system is in equilibrium. B hangs 30° to the vertical as shown in the diagram below, A and B are 20 mm apart in the same horizontal plane. 30° A B 20 mm Define electric field strength at a point in words. (2) 2.7 Draw the electric field pattern between two charged spheres A and B. (3) 2.8 A small test charge is placed 20 mm to the right of sphere B, on the same plane. If the charges on both A and B is -3,58 nC and the repulsive force of sphere A on sphere B is 0,028 N to the right: A B •p 20 mm 20 mm Calculate the net electrostatic field on • p, due to charges A and B. (6) 2.9 The charge on B is now changed to be positive, 3,58 nC. Explain what will happen to charges A and B, by referring to the force, charges and the end charge of the system. (4) [30] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES 8 GRADE 11 QUESTION 3 (Start on a new page.) Consider the list of six substances with their formulae and boiling points in the table below. NAME FORMULA BOILING POINT (°C) Water H2O 100 Ethanol CH3CH2OH 78 Bromine Br2 58,8 Iodine I2 184,3 Ammonia NH3 -33,3 Phosphine PH3 -87,7 3.1 Define the term boiling point. (2) 3.2 Explain why the boiling point of iodine is so much higher than that of bromine, by referring to the intermolecular forces present in each substance. (4) 3.3 Compare ammonia and phosphine and explain the difference in their boiling points by referring to the intermolecular forces present in each substance. (4) 3.4 Define the term vapour pressure. (2) 3.5 Which substance in the table above will have the lowest rate of evaporation? Give a reason for your answer. (3) 3.6 Explain why iodine is not soluble in water by referring to the intermolecular forces in each substance. (3) [18] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES 9 GRADE 11 QUESTION 4 (Start on a new page.) 4.1 Consider the reaction between sulphur dioxide and oxygen to produce sulphur trioxide. 4.1.1 Define 1 mole of a substance. (2) 4.1.2 Write down the balanced chemical equation for the reaction. (3) If 14 g of sulphur trioxide is produced at STP, calculate: 4.1.3 The volume of sulphur dioxide required in the reaction (4) 4.1.4 The mass of oxygen that has been used up in the reaction (4) 4.2 A compound consists of 85,7% carbon and 14,3% hydrogen. Its molar mass is 56,12 gmol-1. 4.2.1 Calculate the empirical formula of the compound. (5) 4.2.2 Determine the molecular formula of the compound. (2) [20] P.T.O.

Downloaded from hlayiso.com QUESTION 5 (Start on a new page.) Potassium chlorate (KClO3) is a strong oxidising agent that has a wide range of uses. It can be a component of explosives, fireworks, safety matches and disinfectants. In a school laboratory, it is used to generate oxygen in the following balanced reaction: 2KCℓO3(s) → 2KCℓ(s) + 3O2(g) Two samples of KCℓO3 with equal mass of which one is pure and one is impure, are placed in open containers on a balancing scale, as shown in the diagram below. cotton wool plug KCℓO3(s) Balancing scale 130,000 g The table below shows the results obtained. Initial mass Final mass Pure sample 130 g 79 g Impure sample 130 g 60,79 g 5.1 Explain why the mass of the flask with its contents decreases. (2) 5.2 Calculate: 5.2.1 The mass of the KCℓ (s) that will form from the impure sample (2) 5.2.2 The mass of the O2 (g) that will form from the impure sample of KCℓO3 (4) 5.2.3 The percentage purity of the impure sample of KCℓO3 (4) [12] TOTAL: 100 END

Downloaded from hlayiso.com DATA FOR PHYSICAL SCIENCES GRADE 11 (PHYSICS) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 11 (FISIKA) TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE Acceleration due to gravity g 9,8 m·s-2 Swaartekragversnelling Gravitational constant G 6,67 x 10-11 Nm2kg-2 Swaartekragkonstante Radius of Earth RE 6,38 x 106 m Straal van Aarde Coulomb's constant K 9,0 x 109 Nm2·C-2 Coulomb se konstante Speed of light in a vacuum c 3,0 x 108 m·s-1 Spoed van lig in 'n vakuum Charge on electron e -1,6 x 10-19 C Lading op electron Electron mass me 9,11 x 10-31 kg Elektronmassa Mass of the Earth M 5,98 x 1024 kg Massa van die Aarde TABLE 2: FORMULAE/TABEL 2: FORMULES MOTION/BEWEGING v f = v i + a t x = v i t + 21 at 2  v + vi  v f = v i + 2ax 2 2 x =  f  t  2  FORCE/KRAG Fnet = ma w = mg Gm1m 2 fs (max) F= s = r2 N f k = k N

Downloaded from hlayiso.com WAVES, SOUND AND LIGHT/GOLWE, KLANK EN LIG 1 v=f T= f ni sin i = nr sin r c n= v ELECTROSTATICS/ELEKTROSTATIKA kQ 1Q 2 F F= (k = 9,0 x 109 Nm2·C-2) E= r2 q kQ W E= 2 (k = 9,0 x 109 Nm2·C-2) V= r Q ELECTROMAGNETISM/ELEKTROMAGNETISME  =−N  = BA cos  t CURRENT ELECTRICITY/ELEKTRIESE STROOMBANE Q V I= R= t I 1 1 1 1 = + + + ... R = r1 + r2 + r3 +... R r1 r2 r3 W = Vq W P= Δt W = VI  t P = VI W= I2R  t P = I2R V 2 Δt V2 W= R P= R

Downloaded from hlayiso.com DATA FOR PHYSICAL SCIENCES GRADE 11 (CHEMISTRY) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 11 (CHEMIE) TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE Avogadro's constant NA 6,02 x 1023 mol-1 Avogadro se konstante Molar gas constant R 8,31 J∙K-1∙mol-1 Molêre gaskonstante Standard pressure p 1,013 x 105 Pa Standaarddruk Molar gas volume at STP Vm 22,4 dm3∙mol-1 Molêre gasvolume by STD Standard temperature T 273 K Standaardtemperatuur TABLE 2: FORMULAE/TABEL 2: FORMULES p1V1 p 2 V2 = pV = nRT T1 T2 m N n= n= M NA V n m n= c= OR/OF c= Vm V MV

Downloaded from hlayiso.com PHYSICAL SCIENCES 14 GRADE 11 TABLE 3: THE PERIODIC TABLE OF ELEMENTS/TABEL 3: DIE PERIODIEKE TABEL VAN ELEMENTE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 (I) (II) (III) (IV) (V) (VI) (VII) (VIII) 1 2 2,1 H He 1 4 3 4 5 6 7 8 9 10 1,0 Li 1,5 Be 2,0 B 2,5 C 3,0 N 3,5 O 4,0 F Ne 7 9 11 12 14 16 19 20 11 12 13 14 15 16 17 18 0,9 Na 1,2 Mg 1,5 Aℓ 1,8 Si 2,1 P 2,5 S 3,0 Cℓ Ar 23 24 27 28 31 32 35,5 40 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 0,8 K 1,0 Ca 1,3 Sc 1,5 Ti 1,6 V 1,6 Cr 1,5 Mn Fe 1,8 1,8 Co 1,8 Ni 1,9 Cu 1,6 Zn 1,6 Ga 1,8 Ge 2,0 As 2,4 Se 2,8 Br Kr 39 40 45 48 51 52 55 56 59 59 63,5 65 70 73 75 79 80 84 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 0,8 Rb 1,0 Sr 1,2 Y 1,4 Zr Nb 1,8 Mo Tc 1,9 2,2 Ru 2,2 Rh 2,2 Pd 1,9 Ag 1,7 Cd 1,7 In 1,8 Sn 1,9 Sb 2,1 Te 2,5 I Xe 86 88 89 91 92 96 101 103 106 108 112 115 119 122 128 127 131 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 0,7 Cs 0,9 Ba La 1,6 Hf Ta W Re Os Ir Pt Au Hg 1,8 Tℓ 1,8 Pb 1,9 Bi 2,0 Po 2,5 At Rn 133 137 139 179 181 184 186 190 192 195 197 201 204 207 209 87 88 89 0,7 Fr 0,9 Ra Ac 58 59 60 61 62 63 64 65 66 67 68 69 70 71 226 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 140 141 144 150 152 157 159 163 165 167 169 173 175 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 232 238