(a) What happens when methane (natural gas) burns in air? Write the chemical equation of the reaction involved.
(b) What happens when ethanoic acid reacts with sodium carbonate? Write chemical equation of the reaction involved.
(c) Give a test that can be used to differentiate chemically between butter and cooking oil.
(a) Carbon dioxide and water vapour are formed when methane burns in air.
CH4 + 2O2 → 2N2O + Heat + Light
(b) Ethanoic acid reacts with sodium carbonate to form sodium ethanoate and carbon dioxide.
2CH3COOH + Na2CO3 → 2CH3COONa + CO2 + H2O
(c) Add bromine water to a little of cooking oil and butter taken in separate test tubes:
(i) Cooking oil decolourise bromine water (showing that it is unsaturated compound.)
(ii) Butter does not decolour bromine water (showing that it is unsaturated compound.)