Physical Sciences Grade 10 P2 March Test 2019 Paper & Memo

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Ehysice: Sclences re Downloaded from hlayiso.com. ......«. INSTRUCTIONS AND INFORMATION 4, This question paper consists of FIVE questions. Answer ALL the questions in the ANSWER BOOK. 2. Number the answers correctly according to the numbering system used in this question paper. QQ Leave ONE line between two sub questions, for exarnple between QUESTION 2.4 and QUESTION 2.2. 4, You may use a non-programmable calculator. 6. You may use appropriate mathematical instruments. 6. YOU ARE ADVISED TO USE THE ATTACHED DATA SHEET. 7, Show ALL formulae and substitutions in ALL caiculations. 8. Round off your FINAL numerical answers to a minimum to TWO decimal places. 3. Give brief motivations, discussions, et cetera where required. 40. Write neatly and legibly. Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Marc. Bt Common Test “hysical Sciences FZ QUESTION 4: MULTIPLE. CHOICE Four options are provided as possibie 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 1.5 A. 1.1. Silicon is classified as a ... A. Metal B. Non-Metal on Semi-metal D. Heterogeneous mixture (2) 1.2 The tendency of an atom in a molecule to attract the bonding electrons is known as the ... A. Atomic radii B. Electron affinity on Electronegativity D. lonization energy (2) 1.3. The valency of sulphur in the elemental form is ... GOULD amon 6 (2) [6] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com .... QUESTION 2 2.1 Write down the definition of a hornogeneous mixiure. (2} 2.2 Study the following table and answer the questions that follow. [A lror filings and sand 8 Mg D | AbOs Water E Olt Sodium sulphate 2.2.1 Identify the substance that is in the elementa! form in the table. (4) 2.2.2 Write down the name of substance B. (1) 2.2.3. What is the name of substance D. (1) 2.2.4 Write down the chemical formula for substance G. (2) 2.2.5 Name a suitable technique that can be used for the separation of substance A into its components. (4) Equal volumes of E and F are mixed together in a beaker. 2.2.6 \s this a homogeneous or heterogeneous mixture? Give a reason. (2) 2.2.7 Describe a simple method by which this mixture can be separated into its components in the laboratory. Oo Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 5 March 2019 Common Test NSC - Grade 10 QUESTION 3 Grade 10 learners conducted an experiment to determine the heating curve of a substance under standard atmospheric pressure. The results obtained are shown in the graph below. 80 60 0 .Ee 40 � - 20 / ., ,I � 0 E 5 10 15 20 25 30 35 40 45 rime in mins -20 V / -40 3.1 State the definition of the freezing point of a substance. (2) 3.2 Write down phases of the substance at point W. (2) 3.3 Complete the following statement using one of the following terms: GREATER THAN; LESS THAN or EQUAL TO. (Write down only the answer in your answer book.) "The average forces of attraction between the particles at point X are the average forces of attraction between the particles at point W" (1) 3.4 For the above experiment write down the controlled variable (1) 3.5 Between time 7,5 and 15 minutes, the graph shows no change in temperature. Explain this observation. (2) 3.6 Is the above substance water? Write only YES or NO. Give a reason (2) [10] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com NSC - Grade 10 Physical Sciences P2 6 March 2019 Common Test QUESTION 4 41 4.1.1 State the definition of jonization energy. 4.1.2 Explain why ionization energy increases on going across a period. 4.2 For each of the following questions, choose from INCREASES; DECREASES or REMAINS THE SAME. 4.2.1. How does the electronegativity of elements change on going across a period? 4.2.2 How does the atomic radius of elements change on going down a group? 43 4.3.1. How many neutrons are there in the atom ’Ca? 4.3.2 How many protons are there in the sodium ion, Na” ? 4.4. What is the name of the group in which sodium is found? 4.5 The following table shows the isotopes of carbon and their percentage abundance. Isotopes Percentage Abundance ce) 98,89% 8c 1,11% If the atomic mass number of '7C is 12,011 g.mol" and the relative atomic mass of carbon is 12,00 g.mol" calculate the atomic mass number of ‘°c. 4.6 Write down the electronic configuration (sp notation) for the chlorine atom. QUESTION 5 5.1. Write down the definition of a covalent bond. 5.2 Draw Lewis structures for the following substances. 5.2.1 NH3 5.2.2 MgBr2 5.3 What is the name of the bond between the atoms of copper in a copper pipe? Copyright Reserved TOTAL MARKS: (2) (3) (3) (2) [15] (2) (2) (1) 7] [50] Please Turn Over

pawesay yubuAdog JOAQ UN] ase TABLE 3: THE PERIODIC TABLE OF ELEMENTS 5 6 7 8 9 0 11 #12 #13 #14 «+15 816 «617 © «(18 ay wv) (vil) (vil) Atomic number 2 KEY/SLEUTEL Atoomgetal He 4 a 29 10 Electronegativity ® Cu Symbol Elektronegatiwiteit_,| — 63,5 |¢—Simboo! Ne 18 Approximate relative atomic mass i 2 Ar Benaderde relatiewe atoommassa 40 24[ 25] 26| 27] 28 36 = Crj/2Mn|2 Fe 2 Co|2 Ni x Kr 52| 55| 56| 59| 59 84 42| 43) 44! 45) 46 54 = Mo/? Tec 8 Ru/& Rh|& Pd Xe 96 101| 103/ 106 131 74| 75| 761 #771 ~78 86 W; Re;| Os] Ir; Pt i Rn 184/186 Zd SODUBINS jesIsAUd 59 60 Pr | Nd 144 91 92 Pa; U 238 sal UOWWOD 6L0z YEW

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Physical Sciences QUESTION 3 wnloaded.from.hla 3.1. The freezing point is the temperature at which a liquid changes to a solid (by the removal of heat energy). ~ 3.2 Liquid and gaseous phases. v ~ 3.3 LESS THANY 3.4 Atmospheric pressure ¥ 3.5 Attime 7,5 to 16 minutes - Stage whereby a solid is converted to a liquid by adding energy (heat). (2) (2) (1) a - Energy (heat) added is absorbed ~’by particles to increase vibrations / internal energy of particies. “ (2) 3.6 No ¥,, the boiling point is not equal 100°C “or melting point is not equal ta 0°C. (2) : QUESTION 4 4.1 4.1.1 The ionization energy is the energy needed to remove a mole of electron(s) from a mole of gaseous atoms. “~~ [10] (2) 4.1.2 The number of protons increases”, electrons are entering the same energy levelv’, thus force of attraction between electrons and the nucleus increases. 4.2 4.2.1 Increases ¥ 4.2.2 Increases ¥ 43 43.1 22” 432 11 44 Alkali metals ¥ Copyright Reserved (1) (1) Please Turn Over 45 RAM yiso.com.. Mic x % abundance March 2019 Common Test M®cx % abundance 12,06 100% 12.011x 98.89% 100% Mc x 1,11% MB. = 4.6 — 18?2s?2p83s?3p5 vv QUESTION 5 100% 41,999 (12) g.-mortv 100% (3) (2) [15] 5.1 Covalent bond is defined as the sharing of electrons between atoms to form molecules. “~ 5.2 5.2.1 we 5.3 Metallic bond. ¥ Copyright Reserved s a {2) (2) vv TOTAL MARKS: [50]