PHY-P2-March-Qp & Memo-2020-Gr10_hlayiso.com_.pdf

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Physical Sciences P2 Downloaded from hlayiso.com March 2020 Common Test NSC - Grade 10 INSTRUCTIONS AND INFORMATION 10. This question paper consists of FIVE 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 3 March 2020 Common Test NSC - 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 — 1.3) in the answer book, for example 1.4 A. 1.1. Which term describes the ability of material to change shape on hammering? A. Brittle B. Ductile (oF Malleable D Tensile strength (2) 1.2 Substances A, B, C and D are pure substances. The following diagram represents the results of a separation technique using a sample X. ° (@) (@) - [e) fo} @ 1@) (S) le) Ce) 1S) A B c D Sample X Which ONE of the pure substances is not present in sample X? DOm> roudw 1.3. Which ONE of the following reactions represents the FIRST ionization energy of Sodium (Na)? A. Na (g) + energy — Na*(g) + & B Na (s) + energy —» Na*(g) + &° C. —_Na* (aq) +e" + energy — Na (s) D Na’ (s) + e° + energy — Na (s) (2) [6] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 March 2020 Common Test NSC - Grade 10 QUESTION 2 2.1. Given the following information answer the questions that follow. A. Diamond B. Ethanol Cc. Potassium dichromate D. ClO3" E. Water 2.1.1 Identify the substance that is composed of one element. (1) 2.1.2 Write down the name for D. (2) 2.1.3. Write down the chemical formula for C. (1) 2.2 Equal volumes of B and E are thoroughly mixed together in a beaker. 2.2.1 Is this a homogeneous or heterogeneous mixture? (1) You are required to separate this mixture into its components. 2.2.2 Name the suitable separation technique that can be used here. (1) 2.2.3. Describe the method by which this mixture can be separated into its components. (2) [8] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 March 2020 Common Test 5 NSC - Grade 10 QUESTION 3 Grade 10 learners conducted an experiment to determine the heating curve of water by using CRUSHED ICE under standard pressure. The experimental set up is shown below. Ww Crushed ice xX 3.1. Define boiling point. (2) 3.2 Write down the name of the instrument labelled W. (1) 3.3 Why is crushed ice used instead of ice cubes? (2) 3.4 The graph below, not drawn to scale, shows the results obtained. & x o t 1 5 ' 1 8 i ' 3 4 to ts ty Time (minutes) 3.4.1 Write down the value represented by X. (1) 3.4.2 Name the predominant phase of this substance between tz and ts. (1) 3.4.3. Write down the process taking place between ts and ta. (1) 3.4.4 Explain the increase in temperature between tz and ts. (2) 3.4.5 How will the above graph be affected if a larger quantity of crushed ice was used? (1) [11] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 March 2020 Common Test NSC - Grade 10 QUESTION 4 41 4.1.1 Define atomic radius. (2) 4.1.2 Explain the trend in atomic radius across a period. (3) 4.2 Complete the table below for substances P and K*. Write down ONLY the question number (4.2.1 and 4.2.2) and the answer in the answer book. ELEMENT NUMBER OF NUMBER OF NUMBER OF PROTONS ELECTRONS NEUTRONS 3'p 15 15 4.2.4 38K" 19 4.2.2 20 (2) 4.3. Define relative atomic mass. (ap 4.4 Innature, magnesium has the following common Isotopes. Isotopes Molar Mass Abundance (%) “Mg 23,985 78,70 =NIg 24,959 10,13 Mg 25,983 x 4.4.1. Calculate the isotopic abundance of *°Mg. (1) 4.4.2 Calculate the relative atomic mass of Mg. (3) 4.5 Write down the electronic configuration (sp notation) for the chloride ion. (2) 4.6 What is the valency of sulphur? (1) 4.7 What is the name given to group Il elements? (1) [16] QUESTION 5 5.1. HCfis a gaseous molecule. 5.1.1. What is the name of the HCf molecule? (1) 5.1.2 Name type of bond between atoms in the HC£ molecule? (1) 5.1.3 Is the above molecule polar or non-polar? Explain the answer by referring to the electronegativity. (3) 5.2 Draw Lewis structures for: 24 Nis (2) 5.2.2 COs. (2) [9] TOTAL MARKS: [50] Copyright Reserved

Downloaded from hlayiso.com TABLE 3: THE PERIODIC TABLE OF THE ELEMENTS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 (I) (il) (It) (IV) (Vv) (VI) (VE) (VIN) 41 2 a : KEY/SLEUTEL Atomic number a 3 4 5 6 7 8 9 10 = Li eS Be Electronegativity —> Symbol x a c 3 o ie) Ne 7 9 11 12 14 16 19 20 11 12 Simbool 13 14 15 16 17 18 S Na | Mg Approximate felative atomic mass 2 A |2 SINS «sisce; Ar 23 24 Benaderde relatiewe atoommassa 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 e K [2 Cal Sc [2 Ti |2 V [2 Cr|2Mn/2 Fe |2 Co [2 Ni |2 Cu/2 Zn [2 Ga |2 Ge |8 As |& Se |& 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 6 Rb 2 Sr |S Y = Zr} NbiZ Mol2 Te |S Rujs Rh|s Pdi Ag |= Cd|= In 2 Sn|2 Sbis Tela | | Xe 86 88 89 91 92 96 101 m03 | 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 & Cs/@ Ba| Laj2 Hf; Ta} Wj Re| Os| Ir Pt; Au| Hg/2 Té |2 Pb|/2 Bi |S Pol At; Rn 133 137 139 179| 184 184| 186; 190; 192; 195| 197| 201 204| 207| 209 87 88 89 K o s Friis Ac 58 59 60 61 62 63 64 65 66 67 68 69 70 71 —4 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 Copyright Reserved

Downloaded from hlayiso.com Physical Sciences P2 1 March 2020 Common Test NSC – Marking Guideline PHYSICAL SCIENCES: CHEMISTRY P2 MARKING GUIDELINE COMMON TEST MARCH 2020 NATIONAL SENIOR CERTIFICATE GRADE 10 MARKS: 50 TIME: 1 hour N.B: This marking guideline consists of 4 pages. Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 2 March 2020 Common Test NSC – Marking Guideline SECTION A QUESTION 1 1.1 C  (2) 1.2 B  (2) 1.3 A  (2) [6] QUESTION 2 2.1 2.1.1 Diamond  (1) 2.1.2 Chlorate (ion)  (2) 2.1.3 K2Cr2O7  (1) 2.2 2.2.1 Homogeneous  (1) 2.2.2 (Fractional) distillation  (1) 2.2.3 Heat the mixture until the component that boils first leaves the flask.  Condense the gaseous component and collect it in another flask. (2) [8] QUESTION 3 3.1 Temperature of a liquid at which its vapour pressure is equal to the external (atmospheric) pressure.  (2) 3.2 Thermometer  (1) 3.3 Allows easy flow of heat energy from one particle to the next.  (2) 3.4 3.4.1 100 oC  (1) 3.4.2 Liquid (phase)  (1) 3.4.3 Boiling  (1) 3.4.4 Water molecules / particles gain potential (internal) energy  Particles vibrate vigorously /kinetic energy increases, hence temperature rises. (2) 3.4.5 Time taken for the process would increase.  (1) [11] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 3 March 2020 Common Test NSC – Marking Guideline QUESTION 4 4.1 4.1.1 The mean distance from the nucleus to the border of the outer orbital of an atom.  (2) 4.1.2 Across the period, the number of electrons increases within the same energy level, thus effective attraction between electrons increases. Therefore, the atomic radius decreases. (3) 4.2 4.2.1 16 (neutrons)  (1) 4.2.2 18 (electrons)  (1) 4.3 Mass of a particle on a scale where an atom of carbon-12 has a mass of 12.  (1) 4.4 4.4.1 Abundance = 100 – (78,70 + 10,13) = 11,17%  (1) POSITIVE MARKING FROM 4.4.1. 4.4.2 (3) 4.5 1s22s22p63s23p6  (2) 4.6 Two  (1) 4.7 Alkali-earth metals.  (1) [16] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 4 March 2020 Common Test NSC – Marking Guideline QUESTION 5 5.1 5.1.1 Hydrogen chloride  (1) 5.1.2 Polar covalent (bond)  (1) 5.1.3 Polar  (1) 5.1.4 Chlorine has higher electronegativity than hydrogen .The shared electron pair is found closer to the chlorine end of the molecule. The chlorine end becomes negative and hydrogen end is positive. (2) 5.2 5.2.1  (2) 5.2.2  (2) [9] TOTAL MARKS: [50] Copyright Reserved Please Turn Over