Physical Sciences Grade 10 April Test 2021 Paper & Memo

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Downloaded from hlayiso.com Physical Sciences Common Test April 2021 INSTRUCTIONS AND INFORMATION d: This question paper consists of SEVEN questions. Answer ALL the questions in the ANSWER BOOK. 2. Number the answers correctly according to the numbering system used in this question paper. 3. Leave ONE line between two sub questions, for example between QUESTION 2.1 and QUESTION 2.2. 4, You may use a non-programmable calculator. 5: You may use appropriate mathematical instruments. 6. YOU ARE ADVISED TO USE THE ATTACHED DATA SHEET. if Show ALL formulae and substitutions in ALL calculations. 8. Round off your FINAL numerical answers to a minimum to TWO decimal places. 9. Give brief motivations, discussions, et cetera where required. 10. Write neatly and legibly. Copyright reserved Please turn over

Physical Sciences Downloaded from 3 hlayiso.com Common Test April 2021 Grade 10 QUESTION 1: MULTIPLE- CHOICE 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 - 1.6) in the answer book, for example 1.7. D. 1.1 A glass rod is POSITIVELY charged by rubbing it with a silk cloth. Which ONE of the following statements is TRUE? A Electrons are transferred from the glass rod to the silk cloth. B Electrons are transferred from the silk cloth to the glass rod. C Protons are transferred from the glass rod to the silk cloth. D Protons are transferred from the silk cloth to the glass rod. (2) 1.2 Which one of the following terms best describes the ability of a metal to change shape on hammering A Brittle B Density C Ductile D Malleable (2) 1.3 The process when solids change directly into the gaseous phase is called ... A Condensation B Sublimation C Freezing D Combustion (2) 1.4 The energy released when an electron is added to an atom or molecule is called ... A. Electron affinity B. Electronegativity C. Ionisation energy D. 1st ionisation energy (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Science Common Test Anril 2021 viaus 1 1.5 The bond between two nitrogen atoms in the Nz molecule is known as a/an ... A. lonic bond B. Dative covalent bond Cc. Metallic bond D Covalent bond (2) 1.6 The Ni ion is known as the ... ion A. Nitrite B Nitride Cc. Nitrate D Nitrogen 9 (2) [12] QUESTION 2 2.1. What is meant by triboelectric charging? (2) 2.2 Three metal spheres are placed on insulated stands and carry charges as shown below. -3,2x10"7C -4,8x10°°C “1,4 X10°C 2.2.1 Determine the number of excess electrons found on sphere A. (3) 2.2.2 Is it possible for the charge indicated on sphere C to exist? State YES or NO. Give a reason for the answer. (2) 2.2.3. Name the principle used to explain your answer to question 2.2.2. (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences common Test April 2021 Grade 10 2.3 Two identical metal spheres are placed on insulated stands as shown below. -6.4nC UNCHARGED Sphere A carries a charge of -6,4 nC and sphere B is UNCHARGED. 2.3.1. What is meant by sphere B is uncharged? (2) Sphere A is now brought CLOSE to sphere B. The spheres DO NOT touch. 2.3.2 Drawa sketch to show the charge distribution that takes place on sphere B. (2) 2.3.3. Name the phenomenon as described in question 2.3.2. (1) The two spheres are now made to TOUCH each other and they are then separated. 2.3.4 State the Law of Conservation of Charge (2) 2.3.5 Calculate the new charge on each sphere after touching. (3) 2.4 Refer to the six spheres A — F below. Sphere A is POSITIVELY charged. The charges on the other spheres are unknown. OOOOOO A learner wishes to determine the nature of the charges on the other 5 spheres. She makes the following observations: F attracts both A and B D repels C E attracts D but repels F C attracts B eecee Use the above information to determine the nature of the charges on spheres B, C, D, E and F. (5) [23] Copyright reserved Please turn over

Downloaded from hlayiso.com : rage 1U QUESTION 3 3.1 Use the following substances to answer the questions that follow. lron Copper Sulphur Silicon Air Ammonium sulphate TM OO} > 3.1.1 Identify the ELEMENT that has a dull surface and cannot conduct electricity. (1) 3.1.2 Identify TWO substances that are brittle. (2) 3.1.3 Which element has magnetic properties? (1) 3.1.4 Identify the metalloid that is used in computers. (1) 3.1.5 Write down the chemical formula for F (ammonium sulphate) (2) 3.1.6 Identify the mixture in the table (1) 3.2. The base of a frying pan is made from aluminium while its handle is made from hard plastic. 3.2.1 Why is the base of the pan made from aluminium? (1) 3.2.2 Why is the handle made from hard plastic? (1) [10] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences Common Test April 2021 Grade 10 QUESTION 4 Grade 10 learners conducted an experiment to determine the heating curve of water by using crushed ice under standard pressure. The experiment was set up as shown below. 4.1 Define the term temperature. (2) 4.2 Name the apparatus labelled X. (1) 4.3. Whyis it important to continuously stir the melting ice with a glass rod? (1) 4.4 The graph below shows the results obtained. 100 Temp (°C) \ 0 —_ : A" te ts ty ts Time (minutes) -20 4.4.1. Name the process taking place between t; and tz. (1) 4.4.2 Will the water particles move SLOWER or FASTER between t, and ts when compared to the movement of the particles between 0 and t1? Explain the answer. (2) 4.4.3. Will the potential energy between ts and t, INCREASE, DECREASE or REMAIN THE SAME? (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Commoan Tact Anrit ano Physical Sciences viaue iu 4.4.4 Can diffusion occur between t, and ts? Answer YES or NO. Explain. (2) 4.4.5 Can the particles be compressed between t, and ts? Answer YES or NO. (1) The forces between particles of ETHANOL are WEAKER than those in water. 4.4.6 Will the boiling point for ethanol be GREATER THAN or LESS than 100°C under the same standard conditions? (1) [12] QUESTION 5 An element X has the following electron configuration: 1s*2s?2p* 5.1 In which group in the periodic table will this element be found? Give a reason for the answer by referring to the above electron configuration. (2) 5.2 In which period in the periodic table will this element be found? Give a reason for the answer by referring to the above electron configuration. (2) 5.3. For element X, write down: 5.3.1 Its chemical name. (1) 5.3.2 Its normal valency. (1) 5.4 Anatom of element X forms an ion 5.4.1 Write down the name of the ION that forms when an atom gains electrons. (Choose from ANION or CATION) (1) 5.4.2 What will be the charge on the ion formed from atom X? (1) 5.4.3 From the periodic table, identify an element with the same electron configuration as the ion formed from atom X (2) 5.4.4 Write down the chemical NAME for the ion that is formed from atom X (2) [12] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences Common Test April 2021 Grade 10 QUESTION 6 6.1. The table below shows the first ionisation energies of some group one elements 1" lonization energies Element (kJ*mo!"') Lithium 520 Sodium 496 Potassium 419 6.1.1. Define the term first ionization energy. (2) 6.1.2 Write down the name of the group 1 elements. (1) 6.1.3 Explain the trend of 1*' ionization energies on going down the group. (4) 6.2. Potassium naturally exists as isotopes, *°K and “'K. Isotope % abundance Atomic Mass number 2K 93.258 38.964 aK, 6.742 X 6.2.1 Define the term isotope. (2) 6.2.2 The relative atomic mass of potassium is 39. Determine the atomic mass number (X) of Potassium 41 isotope. (4) [13] Copyright reserved Please turn over

Downloaded from hlayiso.com oat Aanlon24 rage 1U QUESTION 7 7.1 Define the term chemical bond. (2) 7.2 Draw Lewis dot diagrams for the following: 7.2.1 Aluminium (1) 7.2.2 Oxygen (1) 7.3 Define the term ionic bond. (2) 7.4 Draw the Lewis structure of KBr. (2) 7.5. Draw the Lewis dot diagrams for the formation of CaCfo. (4) 7.6 Write down the relative atomic mass of potassium. (1) 7.7 Calculate the relative molecular mass for NH3. (2) 7.8 Calculate the relative formula mass for magnesium bromide. a TOTAL MARKS: [100] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences Common Test April 2021 Grade 10 DATA FOR PHYSICAL SCIENCES GRADE 10 PAPER 1 (PHYSICS) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 10 VRAESTEL 1 (FISIKA) TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOL/S/IMBOOL VALUE/WAARDE Electron charge de -1,6x 10°C TABLE 2: FORMULAE/TABEL 2: FORMULES WAVES, SOUND AND LIGHT/GOLWE, KLANK EN LIG v=fa or c=fA T=3 E hf ELECTROSTATICS Q Q,+Q n= Qe 1 Q 2 ELECTRIC CIRCUIT Q=!I At | an no} Pl </|n R, = Ry +Rot.... iT O|S|D\a Copyright reserved Please turn over

com ISO Downloaded from hlay Grade 10 TABLE 3: THE PERODIC TABLE OF ELEMENTS uy $6 Nd 6 £6 ed 16 na £9 ws z9 Wd 19 dd 6s uy 98 S61 4d gL z6b jl dL 061 so 92 t= | GL v8h M ve Leb > ¢ vs 901 Pdi ov €0b ua sv 10h nas vb oL ey 96 io] OW & zy v8 1 ge 6s IN& 8% 6s 09% Zz 96 eds 9% ss UNG} 49 £4 es ve Ov iV ED 0z ®N OF ¥ ®H z (A) 81 (IA) Lb OL SL (Al) vl (a) cl eb LE OL jooquig ” joquixg s‘e9 = ND 6Z jeyoBuioojy * Jequuinu o1WoyW 6 8 Z esseulmooje amanejas apsapeuag ssew o1W0jze ics ayeurxoiddy +-yampeBouonya/z AyianeGau0.399)3 TALNITSIAIN 9 s SLNSW3TS dO A1EVL DIdOdsd AHL :€ FTEVL

Downloaded from hlayiso.com Physical Sciences Common Test April 2024 2 Grade 10 Marking Guideline KWAZULU-NATAL PROVINCE EDUCATION QUESTION 1: MULTIPLE- CHOICE REPUBLIC OF SOUTH AFRICA 14 Av (2) 12). De (2) 13 Bw (2) 14 vv 2) NATIONAL : ° SENIOR CERTIFICATE 15) De (2) 1.6 Bo (2) 112] GRADE 10 QUESTION 2 21 Process by which objects are charged by contact/rubbing vv (2) 224 n=Q ¥ (3) eee BSS SSSS SESH SEEGERS OOEEEREEE SEER EES 4” a PHYSICAL SCIENCES : : " 5 1 . ‘ COMMON TEST Hi 7 " 4 + 2.2.2 No. Smallest charge that can exist is 1,6 X 107° C (2) " APRIL 2021 . : il = 2.2.3. Principle of Charge Quantization ¥ (1) *, MARKING GUIDELINE : 2.3.1 number of electrons equals number of protons vv (if neutral, 1 mark) (2) SPreeTrerirrirrt rrr rrr t er e tt re i 2.3.2 4 Must show positive charges vv MARKS: 100 on the right TIME: 2 hours This marking guideline consists of 6 pages. (2) 2.3.3. Charge Polarisation ~ (1) Copyright reserved Please tum over

Physical Sciences Downloaded from hlayiso.com 3 Common Test April 2021 Grade 10 Marking Guideline 2.3.4 — The total/ net charge in an isolated system “remains constant during any physical process Vv (2) 2.3.5 Qnew = Qr + Q, 2 = _64+0 v 2 =-3.2nC Vv (3) 24 B: neutral vv Cc: positive v D: positive v E: negative v F: negative v (5) [23] QUESTION 3 3.1.14 C /Sulphur v (1) 3.4.2 CandFyy (2) 3.1.3 A/lron ¥ (1) 3.1.4 Silicon/D v (1) 3.1.5 (NHs)2S0, vv (2) 3.1.6 Air v (1) 3.2.1 It is a good thermal conductor cf (1) 3.2.2 It is a good thermal insulator v (1) {10] Copyright reserved Please tum over Physical Sciences 4 Grade 10 Marking Guideline QUESTION 4 41 Measure of the average kinetic energy of the particles vv 42 Bunsen burner ¥ 43 To distribute the heat evenly inthe beaker ~ 44.1 Melting v 44.2 Faster v The temperature has increased OR the water now exists in the liquid phase OR particles have more kinetic energy Vv 443 Increase ¥ 444 Yes v¥ The water is inthe gaseous phase ¥ 445 Yes v 446 Lessthan v QUESTION 5 5.1. Group6v X has 6 valence electrons ¥ Accept the number of electrons in the outermost orbital is 6 5.2 Period 2¥ Highest energy level is 2 “ 5.3.1 Oxygen ¥ 5.3.2 Two ¥ 5.4.1 Anion ¥ 542 24 5.4.3 Neon/Ne vv 5.4.4 oxide vv QUESTION 6 6.1.1 First ionisation energy is the energy needed per mole to remove the first electron from an atom in the gaseous phase. “~~ 6.1.2 Alkali metals ¥ Copyright reserved Common Test April 2021 (2) (1) (1) (1) (2) (1) (2) (1) (1) [12] (2) (2) (1) (1) (1) (2) (2) 12] 2) (1) Please tum over

Downloaded from hlayiso.com Physical Sciences 5 Common Test April 2021 Physical Sciences 6 Common Test April 2021 Grade 10 Marking Guideline Grade 10 Marking Guideline 6.1.3 Ionization energy decreases ✓ The distance between valence orbitals and the nucleus increases✓, therefore the force of attraction between nucleus and outermost 7.6 39 g.mor 1 ✓ (1) electrons decrease✓. Thus. less energy is required to remove the outermost electron. ✓ (4) 7.7 Mr(NH3) = 14 + 3x1 ✓ = 17✓ (2) 6.2.1 Isotopes are atoms of the same element having the same number of proton 7.8 Mr(MgBr2) = 24 + ✓ 2x80 ✓ = 184✓ (3) but different numbers of neutrons. ✓✓ (2) [18) 6.2.2 RAM M39 K x % abundance M 41 Kx % abundance + 100% 100% 41 39.00✓ 38.964 X 93.258%✓ M K X 6.742%✓ + 100% 100% 4 M 1K 39.544 g.mor 1 ✓ (4) [13] QUESTION 7 7.1 Chemical bond is a mutual attraction between two atoms resulting from the simultaneous attraction between their nuclei and the outer electrons. ✓✓ (2) 7.2.1 X xAfx ✓ (1) 7.2.2 (1) X xQ § ✓ xx 7.3 Ionic bond is the transfer of electrons to form cations (positive ions) and (2) 'K � ;; �J anions (negative ions) that attract each other to form a formula-unit. ✓✓ 7.4 1- ✓✓ (2) 7.5 • Ca• (4) Copyright reserved Please tum over Copyright reserved Please tum over