The air is approximately 21% oxygen. Fuels would combust more easily if this proportion was higher.

Choose 1 answer

True

False

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The Sun is an example of a combustion reaction.

Choose 1 answer

True

False

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What is required for the combustion reaction to occur?

Choose 3 answers

Heat

Fuel

Friction

Oxygen

Dry twigs

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Why can combustion be considered an energy transformation? 

Choose 1 answer

because products are made

because chemical potential energy is transformed into thermal, light and sound energy

because chemical energy is transformed into heat energy

because thermal and light energy transforms to chemical potential energy

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Answer incorrect

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