1) What type of reactions involve a compound breaking down by the action of heat? a) Neutralisation b) Thermal decomposition c) Displacement d) Exothermic 2) What colour is copper oxide? a) Black b) White c) Green 3) What is the chemical name for limestone? a) Calcium oxide b) Calcium carbonate c) Copper oxide d) Copper carbonate 4) What colour are sodium carbonate and calcium carbonate? a) Green b) Yellow-orange c) Black d) White e) Brick-red 5) Which equation shows thermal decomposition? a) Metal carbonate + oxygen --> metal oxide + CO2 b) Metal oxide --> metal carbonate + CO2 c) Metal carbonate --> metal oxide + CO2 d) Metal oxide --> metal hydroxide + CO2 6) What is needed to convert calcium oxide into calcium hydroxide? a) Water b) Oxygen c) Heat d) Carbon dioxide 7) What do we see when a piece of limestone is heated strongly? a) Catches fire b) Glows and becomes crumbly c) Glows and gives off steam d) Glows 8) What colour is copper carbonate a) White b) Black c) Green 9) What is needed to convert calcium hydroxide into calcium carbonate? a) Oxygen b) Heat c) Carbon dioxide d) Water 10) What happens when CO2 is bubbled through limewater? a) A precipitate forms b) Calcium carbonate forms c) Limewater turns milky d) All three 11) Most reactive to least reactive, which order is correct? a) copper, sodium, calcium b) sodium, calcium, copper c) calcium, sodium, copper d) sodium, copper, calcium e) copper, calcium, sodium f) calcium, copper, sodium 12) What is a saturated solution of calcium hydroxide better known as? a) Hydrochloric acid b) Universal indicator c) Deionised water d) Limewater 13) Which is the most stable? a) Copper carbonate b) Sodium carbonate c) Calcium carbonate 14) Which has the highest decomposition temperature? a) Sodium carbonate b) Copper carbonate c) Calcium carbonate 15) What is the traditional name for calcium hydroxide? a) Limestone b) Quicklime c) Slaked lime 16) Which is the least stable? a) Calcium carbonate b) Sodium carbonate c) Copper carbonate 17) What do we see when a few drops of water are added to quicklime? a) Glows b) Glows and crumbles c) Crumbles and produces steam d) Produces steam and glows 18) Which has the lowest decomposition temperature? a) Copper carbonate b) Sodium carbonate c) Calcium carbonate 19) How are quicklime / slaked lime classified? a) Acidic b) Neutral c) Alkaline 20) Which does not decompose in a Bunsen flame? a) Copper carbonate b) Calcium carbonate c) Sodium carbonate 21) What is the traditional name for calcium oxide? a) Slaked lime b) Quicklime c) Limestone 22) Why is quicklime / slaked lime sometimes added to soil? a) To increase the level of acidity b) To reduce the level of acidity c) It is a chemical fertiliser d) It is a pesticide

Limestone

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