1) The substances at the start of a reaction are called  a) reactants b) chemicals c) products d) by-products 2) When a reaction is complete we are left with the a) ashes b) products c) remains d) reactants 3) The total mass of the reactants is always a) less than the total mass of the products  b) more than the total mass of the products c) equal to half the mass of the products d) the same as the total mass of products 4) The total mass of the reactants is always a) less than the total mass of the products  b) more than the total mass of the products c) equal to half the mass of the products d) the same as the total mass of products 5) a fuel is a substance that  a) has a chemical energy store b) a kinetic energy store  c) has a potential energy store d) has a light energy store 6) Another name for burning is a) fumigation b) decomposition c) combustion d) deposition 7) The products of complete combustion are  a) water only b) carbon dioxide only c) water and carbon dioxide d) It depends what burns 8) Incomplete combustion takes place when there is a) not enough water b) not enough fuel c) not enough heat d) not enough oxygen 9) Fossil fuels are fuels that  a) are the remains of dead animals and plants b) contain fossils c) will never run out d) can reduce global warming 10) a renewable energy source a) has always been here b) does not easily run out c) is limited in quantity d) has to be made each time 11) fossil fuels are bad for the environment because a) They reduce the amount of fossils b) they are going to run out c) they are only found in some countries  d) they release carbon dioxide, a greenhouse gas

Chemical reactions

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