1) What is combustion? a) Mixing acid and alkali. b) Burning. c) Cutting. d) Breaking down a substance. 2) Which of these is NOT needed to make a fire? a) Fuel b) Heat c) Carbon dioxide d) Oxygen 3) What is a fuel? a) Something that we can eat. b) Something that we can drink. c) Something that can be burned to release energy. d) A dangerous chemical. 4) Which ones are NOT fuels? a) Water and air b) Petrol and diesel c) Coal and natural gas d) Wood e) Dead plants and animals f) Food 5) What is made during combustion? a) Oxygen and carbon dioxide b) Carbon dioxide and water c) Carbon and water 6) How do you know if carbon dioxide is present? a) Limewater turns green b) Limewater turns cloudy/milky c) Limewater stays clear

Combustion

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