1) A fuel is something that a) releases energy when it freezes b) tkes in energy when it burns c) gives out energy when it burns d) gets hot on its own 2) Charcoal is a fuel that is almost pure carbon. When it burns it forms: a) Carbon dioxide and oxygen b) carbon dioxide and water c) water and oxygen d) just carbon dioxide 3) Burning fuels should be given plenty of air because a) if there is not enough air, carbon dioxide may form b) the burning fuel needs carbon dioxide from the air c) poisonous carbon monoxide may form if there is not enough oxygen d) the burning fuel will produce water 4) Displacement reactions can be used to provide a) Electrical energy b) heat energy c) light energy d) electrical energy or heat energy 5) Which of these reactions do not happen in living things? a) respiration b) combustion c) photosynthesis d) digestion 6) Which of these chemicals is made using chemical reactions in a factory? a) glass b) sugar c) cotton d) oxygen 7) New materials may be developed so that they: a) are cheaper to make b) are more expensive c) take longer to make d) are more complicated to make 8) A new drug has to be tested to: a) see if it works b) make sure it does not harm people c) see if it works well and does not harm people d) see how expensive it is 9) In a chemical reaction: a) the mass of the reactants is bigger than the mass of the products b) the mass of the reactants is less than the mass of the products c) the mass of the reactants is usually the same as the mass of the products d) the mass of the reactants is always the same as the mass of the products 10) If you burn coal, the mass of the ashes is less than than the original mass bcause: a) Carbon dioxide forms and escapes into the air b) carbon dioxide has absorbed from the air c) oxygen has been produced d) water has absorbed from the air 11) If you heat copper, its mass increases because: a) it has reacted with oxygen from the air b) metals expand when heated c) heating metals produces carbon dioxide d) mass is conserved 12) In a chemical reaction: a) new atoms are created b) atoms are rearranged to form new substances c) atoms are destroyed d) different atoms are made 13) Which of these is not a hydrocarbon: a) diesel b) hydrogen c) natural gas d) petrol 14) When hydrocarbons burn they form: a) hydrogen oxide only b) carbon dioxide only c) carbon dioxide and water d) smoke only 15) If you burn 12g of carbon and 32g of oxygen, how much carbon dioxide will you make? a) 12g b) 24g c) 32g d) 44g

Chemical reactions

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