1) How do we know a chemical reaction has taken place? a) A gas is given off b) A change in shape c) A change in colour d) All the above 2) What gas is given off when we add magnesium to acid? a) Hydrogen b) Carbon dioxide c) Oxygen 3) Do all substances react with acid? a) Yes b) No 4) Two liquids were mixed together in a test tube. Which one of these would not show that a chemical reaction had taken place? a) The tube got warm. b) Bubbles of gas were given off. c) A brightly coloured solid formed in d) One of the liquids floated on top of 5) Which of these changes is a chemical reaction? a) melting some margarine in a pan b) boiling a kettle of water c) frying an egg d) cooling a drink by putting an ice cube 6) Which statement is true? a) All reactions need energy to start b) Some reactions need energy to start c) All reactions happen when two chemicals are mixed. d) All reactions happen very quickly. 7) Which kind of chemical will react with an acid to form hydrogen? a) metal b) water c) carbon d) petrol 8) Martin and Sophie did an experiment using metal and acid, shown in the picture. Which one do you think is the most reactive? a) A b) B c) C d) D e) E

chemical reactions quiz

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