1) What does burning need? a) Carbon Dioxide,Oxygen,Fire b) Heat,fuel,oxygen c) Helium,Fire,Fuel d) Oxygen,fuel,Nitrogen e) Fire,fuel,heat f) Fuel,Carbon Dioxide,Fire 2) What is the definition of solvent?  a) when a solid becomes part of a liquid b) a liquid that has a solid dissolved in it c) a solid made up of vey small particles d) to separate fine solid particles from a liquid e) a liquid that has a solid will dissolve f) matter that is not a mixture of things 3) Brass gets discoloured in air because of the presence of which of the following gases in air? a) Oxygen b) Hydrogen sulphide  c) Carbon Dioxide d) Nitrogen e) Helium f) Carbon Monoxide 4) What is the scientific name for burning a) Enlightenment b) Calcification c) Composition d) Evaporation e) Combustion f) Glowing 5) The average salinity of sea water is a) 3.5% b) 3.0% c) 2.5% d) 2.0% e) 1.5% f) 4.0% 6) Which of these processes are irreversible changes a) Heating b) Condensing c) Evaporating d) Condensing e) Filtering f) Melting 7) Which of these processes are reversible changes a) Heating b) Mixing c) Burning d) Boiling e) Cooking an egg f) Making a cake 8) Which of these is an example of Condensation a) A snowman disappearing  b) Water heated in a kettle c) Ice forming a puddle d) Clothes dring in a tumble drier e) Icebergs breaking up f) Car windows misting up 9) The correct term for a solid that dissolves is a) a solvent b) a mixture c) a solute d) a solution e) a soluble  f) a saturate 10) Which of these materials is a conductor a) Rubber b) Wood c) Wool d) Brass e) Polythene f) Cardboard

5D Arthur

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