Many fuels are ____, because they are ____ of ____ and ____. When they burn completely, we get • Carbon ____ (CO2); • ____ (H2O); and • ____. Carbon dioxide is a ____ gas, but is not toxic. We produce it when we breathe out! Reactions that produce heat are called ____. If we burn fuels incompletely, we can get • Carbon ____ (CO); and • ____ (C). Soot is unburnt carbon. Carbon monoxide is ____ (can’t see it), ____ (can’t smell it) and ____ (poisonous).

Combustion

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