1) Two liquids were mixed together in a test tube. Which one of these would not show that a chemical reaction had taken place? a) One of the liquids floated on top of the other. b) A brightly coloured solid formed in the tube. c) Bubbles of gas were given off. d) The tube got warm 2) Which of these changes is a chemical reaction? a) melting some margarine in a pan b) cooling a drink by putting an ice cube in it c) frying an egg d) boiling a kettle of water 3) A chemical reaction: a) makes new substances. b) always produces a gas. c) is always reversible. d) does not make new substances. 4) Chemicals can be split up: a) using heat only. b) if they are put in a freezer. c) using heat or electricity. d) only if they contain a metal. 5) Which of these will show that a gas is hydrogen? a) burns with a squeaky pop b) turns limewater milky c) puts a lighted splint out d) makes a glowing splint relight and burn brightly 6) The substances that you get at the end of a chemical reaction are called: a) products b) chemicals c) reactants d) gases 7) Which kind of chemical will react with an acid to form hydrogen? a) alkali b) carbonate c) metal d) water 8) Which two chemicals would you mix together to make carbon dioxide? a) an alkali and a metal b) an alkali and limestone c) an acid and a metal d) an acid and limestone 9) Which statement is true? a) All reactions happen when two chemicals are mixed. b) Some reactions need energy to start them off c) All reactions need energy to start them off. d) All reactions give out energy 10) When a metal burns in air it: a) combines with nitrogen from the air. b) combines with oxygen from the air. c) gives off oxygen. d) gives off carbon dioxide 11) The test for oxygen gas is that it: a) turns limewater milky b) puts a lighted splint out c) makes a glowing splint relight and burn brightly d) burns with a squeaky pop 12) When magnesium burns in the air, how does the amount of energy given out compare with the amount of energy you need to start the reaction off? a) It is more b) It is the same c) It all depends on how much magnesium you use d) It is less 13) A fire needs three things to keep burning. They are: a) heat, fuel, oxygen b) heat, fuel, nitrogen c) smoke, fuel, oxygen d) heat, oxygen, smoke 14) A fire can be put out by: a) removing its oxygen (e.g. by using a fire blanket). b) removing its fuel (e.g. by cutting down trees). c) cooling it down (e.g. by spraying it with water). d) any of the above methods. 15) When a fuel burns: a) there is reversible chemical change and the fuel turns into a gas. b) there is a physical change and the fuel turns into a liquid. c) the chemicals react with the oxygen in the air to make new substances. d) the chemicals react with the nitrogen in the 16) Which statement finishes off this word equation for burning a fossil fuel? fuel + oxygen --> a) carbon dioxide + carbon monoxide b) carbon dioxide + water c) fuel oxide + oxygen d) methane + carbon dioxide 17) Carbon monoxide is particularly dangerous because: a) it is very poisonous and non-toxic. b) it has no smell and is non-flammable. c) it has no colour and no smell. d) it is very poisonous and has no smell. 18) If a fossil fuel burns without enough oxygen, which of these products will be produced? a) carbon dioxide and water b) carbon and carbon monoxide c) carbon and methane d) carbon monoxide and methane 19) In a decomposition reaction: a) one product splits up into several reactants b) one reactant splits up into several products c) several reactants join to make one product d) one reactant joins with the oxygen in the air to make new products 20) To make an explosion you need: a) a fast reaction which produces heat and liquids b) a slow reaction which produces heat and gases c) a fast reaction which produces heat and gases d) a fast reaction which produces a liquid and

Bubbles and bangs quiz

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