Chemistry Paper 2 November 2013

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1. AA and D
2. BA and B
3. CB and C
4. DC and D

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1. AIt has a low boiling point because its molecules are held together by weak intermolecular forces.
2. BIt is highly soluble in water.
3. CIt exists as a giant ionic lattice at room temperature.
4. DIt is a good conductor of electricity in the solid state.

1. ASodium oxide, Na2O, a basic oxide that reacts only with acids
2. BAluminium oxide, Al2O3
3. CMagnesium oxide, MgO, a basic oxide that reacts only with acids
4. DSilicon dioxide, SiO2, an acidic oxide that reacts only with bases

1. ApH 1-2
2. BpH 7
3. CpH 10-12
4. DpH 3-6

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1. A16 g
2. B4.0 g
3. C8 g
4. D6.4 g

1. ACopper hydroxide
2. BCopper(I) oxide
3. CCopper(II) oxide
4. DCopper carbonate

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1. A2H2O -> O2 + 4H+ + 4e-
2. B2Br- -> Br2 + 2e-
3. CPb -> Pb2+ + 2e-
4. DPb2+ + 2e- -> Pb

1. ACu2+ ions are reduced to copper atoms (Cu2+ + 2e- -> Cu).
2. BWater molecules are oxidised to oxygen gas.
3. CHydroxide ions are reduced to hydrogen gas.
4. DCopper atoms are oxidised to Cu2+ ions (Cu -> Cu2+ + 2e-).

1. ABubbles of a colourless gas with a pop sound are produced.
2. BThe electrolyte turns blue.
3. CA white precipitate forms in the melt.
4. DA red-brown vapour is produced.

1. ABromine is a liquid and iodine is a solid.
2. BBoth bromine and iodine are gases.
3. CBoth bromine and iodine are solids.
4. DBromine is a solid and iodine is a liquid.

1. ABoth readily lose electrons to form positive ions.
2. BBoth are strong reducing agents.
3. CBoth have seven electrons in their outer electron shell.
4. DBoth form basic oxides.

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1. AC
2. BA
3. CB
4. DE

1. AIron, the catalyst used in the Haber process for ammonia
2. BPlatinum, used as a catalyst in catalytic converters for cars
3. CVanadium(V) oxide
4. DAluminium oxide, an amphoteric oxide sometimes used as a catalyst support

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1. AFractional distillation
2. BCracking
3. CPolymerisation
4. DFermentation

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1. AThe limewater turns milky, as it does when testing for carbon dioxide gas.
2. BThe bromine water is decolourised.
3. CA pop sound is heard, as when testing for hydrogen gas with a lit splint.
4. DA white precipitate forms, as seen when testing for halide ions with silver nitrate.

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1. A345 kJ
2. B690 kJ
3. C1380 kJ
4. D2760 kJ

1. AEthanol is highly flammable, so heating it with a naked flame would be a fire hazard.
2. BEthanol does not conduct heat well, so a flame would be ineffective.
3. CA naked flame cannot reach a high enough temperature to heat ethanol.
4. DEthanol reacts chemically with the products of a naked flame.