1) For reduction the following happens: a) is the loss of electrons b) is the gain of electrons 2) which of these is an example of oxidation a) H⁺ + OH⁻ → H₂O b) Fe²⁺ → Fe³⁺ + e⁻ c) Cl₂ + 2e⁻ → 2Cl⁻ 3) What is the overall reaction equation for a fuel cell? a) O₂ + 4e⁻ + 2H₂O→ 4OH⁻ b) 2H₂ + O₂ → 2H₂O c) 2H₂ +4OH⁻ → 4H₂O + 4e⁻ 4) The generanl formula for an alcohol is? a) Cn H 2n+1 OH b) Cn H 2n OH c) Cn H n+1 OH 5) What catalyst is used to produce ethanol from ethen and steam? a) iron b) sulphuric acid c) nickel d) phosphoric acid 6) What is the anode half equation for the electrolysis of brine a) 4OH⁻ → O₂+ 2H₂O +4e⁻ b) 2Cl⁻ → Cl₂ + 2e⁻ c) 2H⁺ + 2e⁻ → H₂ 7) what causes permanent water hardness? a) magnesium sulphate b) magnesium carbonate c) calcium carbonate 8) how can you remove temporary hardness? a) use a magnet b) boil the water c) react with an alkali 9) the test for unsaturated fats is a) it burns with a clean flame b) it decolourises bomine water c) it dissolves in ethanol 10) how can you make asprin soluble? a) react it with hydrochloric acid b) react it with an alcohol c) react it with sodium hydroxide

C6 quiz

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