Physical Sciences Grade 11 P2 March Test 2018 Paper & Memo

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Prysical seroes P>DOWNIOAdeS from hlayiSOc@emMes mach 2018 INSTRUCTIONS AND INFORMATION TO CANDIDATES 1 Write your name on the ANSWER BOOK. 4. Answer ALL the questions in the answer book 5 You may use a non-programmable calculator 6 You may use appropriate mathematical instruments. 7. Number the answers correctly according to the numbering system used in this question paper. 8 YOU ARE ADVISED TO USE THE ATTACHED DATA SHEETS. 9 Give brief motivations, discussions, et cetera where required. Copyright Reserved Please Turn Over

Physical Sciences P2 DOWNloaded from hlayise@.GQMi sarc 2018 NSC SECTIONA 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 - 1.4) in the ANSWER BOOK. Eg 1.5 A 4.1. Which one of the following statements concerning bond energy is NOT TRUE? A. Bond energy increases as bond length decreases B. Bond energy increases as atomic radius decreases C. The higher the bond energy, the stronger the bond Dz Bond energy is smaller in multiple bonds than in single bonds (2) 1.2. The graph below shows the potential energy changes of a system of 2 hydrogen atoms as the distance between the 2 hydrogen nuclei changes. Ep o | 0,074 distance apart (nm) A (kj/mol) -436 Which of the following correctly represents the values for the bond energy and bond length respectively? | Bond energy (kJ.mol”) | Bond length (nm) A 0.074 ; - -436 (B. 436 0.074 - [C. | 740x107 _ -436 - _D _-436 7.40 x 10%! Copyright Reserved Please Turn Over

Physical Sciences PDOWNIOaded from hlayiSOGOMes march 2018 NSC 1.3. The shape of the PCls molecule as predicted by the VSEPR theory is: A. Trigonal Bi-pyramidal B. Octahedral en Trigonal planar D. Trigonal pyramidal (2) 1.4. Which one of the following electron-dot structures represents a non-polar molecule? xX H A H¥ Cl 3 B. xe xx HxCx%H xe H xXx xx c. Hs SX D H S0%* H H (2) TOTAL : SECTION A :[8] Copyright Reserved Please Turn Over

physical Sciences P>DOWNIOadeG from hlayiSOcGamMes march 2018 NSC SECTION B INSTRUCTIONS AND INFORMATION 4. Answer all questions. 2. Show the formulae and substitutions in ALL calculations 3 Round off your numerical answers to a minimum of TWO decimal places. QUESTION 2 An experiment is carried out to determine whether potassium nitrate and iodine crystals are soluble in each of the three solvents, water, ethanol and xylene. The results recorded in the table below are incomplete. [ Crystal ____| Water ; Ethanol Xylene | Potassium nitrate A B | | lodine Soluble | c - | 2.1. Refer to the table above. Write down the letters A, B, and C and next to each letter indicate whether the crystals are SOLUBLE or INSOLUBLE in the solvents. 2.2. By referring to types and the strength of intermolecular forces, explain why iodine crystals are soluble in ethanol. 2.3. Alearner wishes to prepare a solution of lodine-water. Instead of adding iodine to water, he first adds the iodine to the ethanol and then adds this mixture to water Fully explain the reasoning behind this approach. (3) [9] Copyright Reserved Please Turn Over

Physical Sciences P2 DOWNloaded from hlayisos@One warch 2018 QUESTION 3 Consider the following molecules and answer the questions. 3.1. 3:2. 3.3. 3.4 3.5. SO ; CO, ; BF3 ; NH; Draw the Lewis structure for the SOz molecule. (2) BF3 and NHs both contain 3 bonds around the central atom. The BF3 molecule is non-polar while the NH3 molecule is polar. Account for this difference between the two compounds using the VSEPR theory. (4) Determine with the aid of a calculation, whether the C — O bond in the CO» molecule is POLAR or NON-POLAR. (2) The boiling point of SO, is -10 °C and that of COz is - 78 °C. Explain why the boiling point of SOz is higher than that of CO2 by referring to the types of intermolecular forces and energy. (4) NHg forms a dative covalent bond with the H* ion to form NH,". 3.5.1. What is a dative covalent bond? (2) 3.5.2. Use Lewis dot structures to show the bonding in the NH,' ion. (2) 3.5.3 Write down the FORMULA of another compound that has a molecular shape similar to the NH4* ion (1) [17] Copyright Reserved Please Turn Over

Physical Sciences P2 DOWNIoaded from hlayiSQ@.GOmnar march 2018 NSC QUESTION 4 The graph below shows the boiling points and molar masses of the hydrides of group 6. 4.1 4.2 4.3 44 4.5. 4.6 Boiling Points of Group 6 hydrides oO 200 L 150 110 < 100 , i a H,Te 2 O sm 50: S 100 HS Hse © _ 150 2004-4 4 7-4 0 20 40 «6080 100 120140 Molecular mass (g.mol”) Define boiling point. (2) Explain why the boiling points increase from H2S to H2Te. (2) The boiling point of water is much higher than that of the other hydrides. Explain fully why this is so. (3) Which hydride will have the highest vapour pressure at -100°C? Give a reason. (2) The density of ice is different to that of water. Explain how this is beneficial to life on earth. (3) The density of water is 1g.mol' at 25 °C. Calculate the number of water molecules in 0,5 dm* of water. (4) [16] TOTAL : 50 Copyright Reserved Please Turn Over

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physical science DOWNIOAd Ed From hlayiSO.CAMs:s common rest CONSTANTS AVOGADRO CONSTANT 6.02 X 10% EQUATIONS n=m/M D=m/V n= N/Na Copyright Reserved

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Downloaded from hlayiso.com Physic: Sciences P2 E} .nmon Test March 2018 NSC- Grade 11 3.5.1 The bond formed when an empty valence shell of an atom shares a lone pair of electrons from another atom v ~ (2) H + 3.5.2 xx H3N SH x vv (2) H 3.5.3 CHa or CC&u vv (1) 17] QUESTION 4 4.1. The temperature at which the vapour pressure of a liquid is equal to atmospheric pressure. v ¥ (2) 4.2 From H2S to H2Te, the molar mass increases, “causing an increase in strength of Van der Waals forces Y More energy is needed to separate the molecules. (2) 4.3. Water has hydrogen bonding “between molecules. The other hydrides have dipole- dipole forces v between molecules. Hydrogen bonding is stronger than dipole-dipole forces. v More energy needed to separate water molecules. (3) 44 HSV Lowest BP. (2) 4.5. Density of ice is less than density of water. v Ice floats on water providing an insulating layer Vfor aquatic life to exist. v OR Water freezes from top down” and captures heatv allowing aquatic organisms to survive (3) 46 D=m/V 1=m/0.5 m = 500g n=m/M ¥ = 500/18 v = 27.78 mol N= nxNa = 27.78 X6.02x 10% = 1.67 x 10 2 molecules ~ (4) {16} TOTAL: 50 Copyright reserved