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 complete combustion? a) When you burn a lot of fuel. b) When you don't burn much fuel. c) Burning something when there's not much oxygen. d) Burning something when there's a lot of oxygen. 6) What is made during complete combustion? a) Oxygen and carbon dioxide? b) Carbon dioxide and water c) Carbon and water d) Carbon monoxide and water 7) What is incomplete combustion? a) When you burn a lot of fuel. b) When you don't burn much fuel. c) Burning something when there's a lot of oxygen. d) Burning something when there's not much oxygen. 8) What is NOT made during incomplete combustion? a) Carbon dioxide b) Carbon (soot) c) Carbon monoxide d) Water 9) Which type of combustion burns with a clean flame? a) Complete b) Incomplete c) Both 10) Which type of combustion burns with a sooty (black) flame? a) Complete b) Incomplete c) Both 11) Which type of combustion makes water? a) Complete b) Incomplete c) Both 12) Which type of combustion makes carbon dioxide? a) Complete b) Incomplete c) Both 13) Which type of combustion makes carbon (soot)? a) Complete b) Incomplete c) Both 14) Which type of combustion makes carbon monoxide? a) Complete b) Incomplete c) Both

Combustion

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