Physical Sciences Grade 11 P2 March Test 2016 Paper & Memo

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Physical scind Own loaded from h layiso ° COMbarch 2016 Common Test NSC QUESTION 1; MULTIPLE CHOICE Four optioris 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 1.1 D. 1.1. Which ONE of the following statements concerning Intermolecular forces is TRUE? They: A hold atoms together in a molecule B hold molecules together in a solid, liquid or gas phase Cc are formed by sharing electrons D are formed by transferring electrons (2) 1.2 Which one of the following describes a bond in which one atom supplies both ( of the bond pair electrons? A Polar covalent bond B lonic bond Cc Dative (Co - ordinate) covalent bond D Metallic bond (2) 1.3. Sodium chloride is dissolved in ethanol. What is /are the predominant type/s of intermolecular force/s between sodium chloride and ethanol? ion-dipole forces induced dipole and ion-induced dipole forces induced dipole and dipole-dipole forces Hydrogen bonding and induced dipole — induced dipole forces (2) ie) C vOoUwPY Copyright reserved Please turn aver

Downloaded from hlayiso.com Physical Science P2 March 2016 Common Test NSC QUESTION 2 2.1. The electron configurations of three elements are given below: P: 1s? 2s! Q: 1s? 2s*2p* R: 1872s72p° Q can form a diatomic molecule, and can also combine with P. Q cannot however combine with R. 22 2.3 2.4 25 2.1.1 What is a diatomic molecule? (1) 2.1.2 What type of bonding occurs when Q forms a diatomic molecule? (1) 2.1.3 Explain how the bonding process between two Q atoms takes place in terms of: orbital overlap, electrostatic forces and energy. (3) 2.1.4. Name the type of bond that forms between P and Q. (1) 2.1.5 Why is it not possible for Q to combine with R? (2) Carbon dioxide, COz,is a gas at room temperature. 2.2.1 Draw the Lewis dot structure for the COz2 molecule. (2) 2.2.2 Nhat is the molecular shape of the CO molecule? (1) 2.2.3 The C—O bond is a polar bond. The CO2 molecule however is non-polar. Account for this observation. (2) What are lone pairs of electrons? (2) Define electronegativity. (2) Calculate the energy needed to break up a mole of CH, into its atoms if 415 kJ mol" is needed to break one mole of C — H bonds. (2) [19] Copyright reserved Please turn over

ownloaded from hlayiso.com NSC Physical Science A) QUESTION 3 3.1 The boiling points of the hydrides of group 15 are given in the table below: Hydride Period Boiling points (°C) NH3 2 33 PHs 3 -87,7 AsHs 4 -65 SbH3 5 “17,1 3.1.1. What is the phase of these hydrides at room temperature (25°C)? Give a reason. (2) 3.1.2 Define boiling point. (2) 3.1.3. Draw a line graph of the boiling points of the hydrides versus period. Use the attached graph paper provided. (4) ( 3.1.4 Describe the trend in the boiling points from PH3 to SbH3. (1) 3.1.5 Explain the trend described above in terms of intermolecular forces and energy. (3) 3.1.6 It is observed that the boiling point NH3 does not follow the expected trend of the other hydrides in this group. Explain this observation. (3) 3.2 Helium is a gas at room temperature. At very high pressures and very low temperatures helium gas becomes a liquid. Explain this observation with reference to the type of intermolecular forces. (3) 3.3 The graph below shows the relationship between the density of water and ¢ temperature. 110000-f-resrontenneietenteantetete as5904 zx 0,9998: 3 0/9997. gs 0,180: : fea id 0.91704 | 8 ~6 ~4 -2 0 2 4 6 8 Ternperature (°C) 3.3.1 How does the density of water change from 0 °C to 4 °C? (1) Copyright reserved Please turn over rch 2016 Common'Test *

es to Physical Science P2 NSC 3.3.2 The trend described above is beneficial to aquatic life. Explain why this is so. 3.4. Water has a high heat of vapourisation. 3.4.1. What is meant by this statement? Downloaded from hlayiso.com 3.4.2 Explain how this property of water is beneficial to life on Earth. Copyright reserved TOTAL MARKS: 2016 Common Test (2) (2) (2) [25] [50] Please turn over

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March 2016 Common Test Iso.com y 7 NSC Downloaded from hla * Physical Science P2 Question 3.1.3 Answer Sheet aged jjo-3e04 Copyright reserved

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