Physical Sciences Grade 10 2022 QP & Memo

Downloaded from hlayiso.com 7, education DEPARTMENT: EDUCATION MPUMALANGA PROVINCE GERT SIBANDE DISTRICT ERMELO SUB DISTRICT SHYS ICAL SCIENCES: ‘CONTROLLED TEST 15 SEPTEMBER 2022 MARKS: 100 TIME: 2:00 HOURS This question paper consists of 11 pages including the data sheets 1

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com INSTRUCTIONS AND INFORMATION 10. 11. This question paper consists of SEVEN questions. Answer ALL the questions in the ANSWER BOOK. Start EACH question on a NEW page in the ANSWER BOOK. Number the answers correctly according to the numbering system used in this question paper. @ ew Leave ONE line between two sub questions, for “example between N QUESTION 2.1 and QUESTION 2.2. wy’ You may use a non-programmable calculatgt © You may use appropriate mathematiea struments You are advised to use the anach oars SHEETS. Show ALL formulae osm in ALL calculations. Round off your Teahpumeta answers to a minimum of TWO decimal places. Give nga discussions et cetera where required. wre and legibly. fe)

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com QUESTION 1 Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Choose the answer and write only the letter (A — D) next to the question number (1.1 — 1.8) in the ANSWER BOOK, for example 1.11 D. 1.1 1.2 1.3 The gravitational potential energy of an object relative to the ground is dependent on the object's A _ speed. B position. C velocity. Ss D_ change in velocity. oS: (2) An object is released from the top of the platform, and S down ward along a frictionless inclined plane Y- Z as shown int iagram below. Which one of the following statements regarding the energy of the ball is correct? A Total rectarigahony at Y is greater than total mechanical energy at ie B Total 5 we, energy at Y is less than total mechanical energy at 7X go energy at Y is equal to total mechanical energy at Oa mechanical energy at Y is not equal to total mechanical energy at Z. (2) The number of wave pulses per second is called .... A Wave length B Amplitude Cc Frequency D Period (2)

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 1.4 Which one of the combinations below concerning longitudinal waves is correct? Compression Rarefaction A | Isregion of high pressure | Is region of low pressure B Is region of low pressure | Is region of high pressure C | Is minimum displacement | Is maximum displacement of of particles particles D_ | Is maximum displacement | Is minimum displacement of of particles particles (2) 1.5 A mixture of Salt and water can be separated by boiling the mixture. The change which take place during the separation of this mixture components is........... A Chemical change only. B Physical change and chemical change. Cc Neither physical change nor chemical change. D Physical change only. (2) 1.6 Which type ofchanges obey the Law of conservation of mass? A Only physical change B Only chemical change Cc Only phase changes D physical change and chemical change (2) 1.7 Consider the following incomplete equation for a chemical reaction: f Na(s) + H2SOx (aq) + NazSO, (aq) + Q Letter Q represents one of the products and letter f represents a numerical value which make the chemical equation correctly balanced. Which one of the combinations below concerning the above chemical equation is CORRECT?

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com Value of f Formula of Q A 1 H B 0 H20 Cc 2 Ho D 1 Ho (2) 1.8 The number of atoms in ONE formula unit of copper(Il)nitrate Cu(NO3)2 is... A 9 B 3 Cc 8 D 5 (2) [16] QUESTION 2 A 5 kg block is released from rest at a height,of 5myandyslides down a frictionless incline O-P as shown in the diagram below. It then moves along horizontal portion PQ where it experiences friction and stops at point Q. Point P is 3 m from point Q. aN, | I | 5m I I I Poo SS P 3m Q 2.1 State the principle of conservation of mechanical energy in words. (2) 2.2 Calculate the: 2.2.1 Gravitational potential energy of the block just before it is released. (3) 2.2.2 Magnitude of the velocity of the block at point p, use the principle of conservation of mechanical energy. (4) 2.2.3 Acceleration that the block experiences as it moves from point P toQ. (4)

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 2.3 Write down the energy conversion which takes place as the block moves (1) from point P to Q. [14] QUESTION 3 Two pulses are travelling towards each other along a spring, as shown in the diagram below.The centres of the two pulses meet and cross at point X. — cl t x 6c + 3.1 Which wave property do the two pulses illustrate at point X? (1) 3.2 Name and define the principle used to answer QUESTION 3.1 (3) 3.3 When the pulses cross at point X, the resulting amplitude is different from the amplitudes of the individual pulses 3.3.1 Define the term amplitude. (2) 3.3.2 Calculate the magnitude of the resulting amplitude. (2) [8] QUESTION 4 The sketch below shows a transverse wave in a medium. B. 2m D Distance z Position (m) >

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 4.1 Use the diagram above to write down: 4.1.1 The name of the physical quantity represented by the distance of 2m. . (1) 4.1.2 Two points that are in phase. (1) 4.1.3 One point that represents a crest. : (1) 4.1.4 One point that represents the rest position. (1) 4.2 Write down the number of waves represented in the diagram above. (1) 4.3 Determine distance Z in the diagram. (2) 4.4 Define the term frequency of the wave in words. (2) 45 Calculate: 4.5.1 The frequency of the wave. (3) 4.5.2 The speed of the wave. (3) [15] QUESTION 5 The diagram below shows a longitudinal wave produced by a musical instrument. Wave propagation T U Vv WwW x 5.1 Define the term a longitudinal wave. (2) 5.2 Write down the name of the parts marked: 5.2.1 U (1) 5.2.2 V (1) 513 Describe the motion of the particle at points U, as the wave propagates to the right. (2) 5.4 Write down the number of wave lengths shown in the diagram. (1)

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 5.5 State whether the following points are IN PHASE or OUT OF PHASE. 5.5.1 TandW (1) 5.5.2 Wand X (1) 5.6 Give a reason for the answer in question 5.5.2 (2) 5.7 Wave particles at point U make 410 oscillations in 2 seconds. Calculate the frequency of the wave. (2) [13] QUESTION 6 6.1 Ice melts when there is a change in temperature of the environment 6.1.1 State whether the melting of ice is a PHYSICAL CHANGE or CHEMICAL CHANGE (1) 6.1.2 Describe the rearrangement of molecules during the melting of ice. (2) 6.2 The word equation (i) and the unbalanced equation (ii) for two chemical reactions are shown below. (i) — Calcium carbonate + hydrochloric acid — Calcium chloride + carbon dioxide + water (ii) 2H202 (aq) — 02 (g) + 2H20 (I) 6.2.1 Give areason why both reactions (i) and (ii) above represent a chemical change. (1) 6.2.2 Write down a balanced chemical equation for the word equation (i). Show the phases of ALL reactants and products. (4) 6.2.3 Use acalculation to show that the Law of Conservation of Mass is valid during reaction (ii). (3) 6.3 Which ONE of the above equations (i) or (ii) represents: 6.3.1 Decomposition reaction? (1) 6.3.2 Synthesis reaction? (1) [13]

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com QUESTION 7 Grade 10 learners demonstrated the reaction of a metal with: an acid.by adding 1,4 g of Zinc to excess hydrochloric acid in the conical’ flask. X volume of hydrogen gas was produced at STP. The reaction which took place is represented by the balanced chemical equation below. Zn(s) + 2HCL(aq) > ZnCt,(aq) + H,(9) 7.1 Calculate: 7.1.1 The value of X (in dm), which is the volume of hydrogen gas produced at STP. (4) 7.1.2 .The mass (in gram) of ZnCé, (theoretical yield) produced. (3) 7.1.3 The percentage yield of ZnCf2, If the actual mass of ZnCt, formed is 2,69 g. (3) 7.2 The formula of the hydrated sodium carbonate is Na,CO,.xH,O. The molar mass of hydrated sodium carbonate is found to be 268 gol. Calculate the number of moles water of crystallisation (x) in the compound. (3) 7.3 Asample of compound Q contains 24,27% C, 4,07% H and 71,65% Ce. 7.3.1 Define the term empirical formula. (2) 7.3.2 Use acalculation to determine the empirical formula of compound Q. (6) [21] TOTAL: 100

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com DATA FOR PHYSICAL SCIENCES GRADE 10 TABLE 1: PHYSICAL CONSTANTS NAME SYMBOL VALUE Molar gas volume at STP Vin 22,4 dm?-molt Electron Mass me 9,11 x 10°" kg Charge on electron e -1,6x 10°C Avogadro’s constant Na 6,02 x 102 mol TABLE 2: MOTION 1.2 Ve = Vj t+ aAt Ax=viAt+ 5 aAt Ve +Vj vi? = VP + 2aax Ax (ac TABLE 3: WEIGHT AND MECHANICAL ENERGY Fg =mg U=E, =mgh 1 2 K=E.=5mv TABLE 4: WAVES, LIGHT AND SOUND v=fXorv = vA T=" or T= : : c n, sind; =n, sin 6, bey TABLE 5: FORMULAE 10

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Downloaded from hlayiso.com Downloaded from Stanmorephysics.com education DEPARTMENT: EDUCATION MPUMALANGA PROVINCE GERT SIBANDE DISTRICT ERMELO SUB DISTRICT | GRADE 10 | PHYSICAL SCIENCES SEPTEMBER 2022 MARKING GUIDELINES MARKS: 100 This marking guidelines consists of 6 pages 1

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com QUESTION 1 1.1 BY Y 1.1 CV 1.3 CVY 14 AVY 1.5 DVY 1.6 BY ¥ 1.7 CVY 1.8 AVY QUESTION 2 2.1 The total energy of an isolated system remains constant.v¥ “ [2 or 0 mk] 2.2.1 Ep=mgh¥ = (5)(9,8)(5) ¥ =24,5)V 2.2.2 = EMey=EMe) / (Ep + Ek)O = (Ep + Ek)P OR: mgh(o) + ¥mv20) = mgh(p) + YamvaP) (5)(8,8)(5) + 0 =V 0 + 14(5) Vv V =9,90 m.s*¥ 2.2.3 POSITIVE MARKING FROM Q 2.2.2 vi? = vi? + 2aAx¥ (0)? =v (9,90)? + 2a(3)¥ a=-16, 34m-s" a= 16, 34m:s-2 in opposite to direction of motion” 2.3 Mechanical/kinetic energy converted to heat/sound/internal energy.” (2) (2) (2) (2) (2) (2) (2) (2) [18] (2) (3) (4) (4) (1) [14]

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com QUESTION 3 3.1 (Destructive) interference.“ 3.2 Principle of superposition. The algebraic sum of the amplitudes of two pulses that occupy the same space at the same time.“ ¥ [2 or 0 mk] 3.3.1 | The maximum disturbance of the particle from its rest (equilibrium) position.¥ ¥ [2 or 0 mk] 3.3.2 8-6¥ =2cm¥v QUESTION 4 4.1.1 Wave length.” 4.1.2 A and CY 4.1.3 BY/D 41.4 AVIC/E 4.2 2v 4.3 3,5 mvv 4.4 The number of wave pulses per second.” ” 45.1 ;_1y wr fo=-cv 3 f= 0,333 Hz¥ 4.5.2 OPTION 1 OPTION 2 V=fiv Ax = VAtY V = 0.333x2Yv 2=VX3V V=0,67ms'¥ |V=0,67m.s'¥ (1) (3) (2) (2) [8] (1) (1) (1) (1) (1) (2) (2) (3) (3) [15]

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com QUESTION 5 5.1 A wave in which the particlessof the medium vibrate parallel to the direction of motion of the wave. Vv ” (2) 5.2.1 RarefactionY (1) 5.2.2. compression” (1) 5.3 The particle moves to the left and right’ ” OR; The particle moves backwards and forwards (then return to its original position). (2) 5.4 av (1) 5.5.1 OUT OF PHASEY (1) 5.5.2 IN PHASEY (1) 5.6 They are separated by a whole number of (complete) wavelengths.¥ ¥ (2) 5.7 f = number of oscillations per second f=410+ 2v f = 205 Hz¥ (2) [13] QUESTION 6 6.1.1 PHYSICAL CHANGEY (1) 6.1.2 Molecules become disorderly arranged V due to breaking of intermolecular forces.” (2) 6.2.1. Newchemical substances are formed.” OR: Mass and atoms are conserved , but the number of molecules is not. (1) 6.2.2 CaCOz3(s)+2HCl (aq) - CaCl (aq) + CO2 (g) + H20 (I) Criteria for marking Q 6.2.2 Correct reactants Correct product Balancing All states are correct cS ES EES (4)

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 6.2.3. 2H,O2(aq) — On (g) + 2H20 (I) 2(1x2+16x2)¥ (16x2) + 2(1x2 +16)” 68 = 68v (3) 6.3.1 (ii)¥ (1) 6.3.2 (iv (1) [13] QUESTION 7 71.1 any = my 1,4 n(Zn) =——¥ = 0,022 mol 65 n(Zn) =nH2= 1:1 nHz = 0,022 mol Vv n(H2) = vm 0,022 = ——_-¥ 22,4 V(Hz2) = 0,493 dm?¥ (4) 7.1.2 9 n(Zn) =nZnCl,= 1:1 NZnCl = 0,022 mol¥ m(ZnClz) = nM m(ZnClz) = 0,022 X 136% m(ZnCl,) = 2,99 g¥ (3) 7.1.3 actual yield % yield = x 100 theoretical yield . 2,69 % yield = F55%t00¥ a % yield = 89,97 %V (3) 7.2 Na,CO,,.xH,O = 268 23x2+12+16x3 + 18x¥ = 268W 106 + 18X = 268 X=9% (3) 7.3.1 The simplest whole-number ratio of atoms in a compound. ¥ ~ (2)

Downloaded from Stanmorephysics.com 7.3.2 Downloaded from hlayiso.com Element Cc H cl m 24,27 4,07 71,65 n=-v — —_ ay M 12 1 35,5 = 2)0225)).)= 4,07 = 2,0183Y 2,0225 4,07 2,0183 Divide by 2,0185 2,0183 2,0183 smallest =1 =2 =1v Empirical formula: CH.CIY TOTAL: 100 (6) [21]