Many fuels are hydrocarbons, because they are compounds of hydrogen and carbon. When they burn in plenty of air the carbon and hydrogen in the fuel are completely ____. We say they have undergone ____ combustion. You get Carbon ____ (CO2); ____ (H2O); and thermal energy. We can test for the gases produced by complete combustion: carbon dioxide turns ____ cloudy, water turns ____ cobalt chloride paper ____ or ____ anhydrous copper chloride paper pink Carbon dioxide is a greenhouse gas, but is not toxic. We produce it when we breathe out! Reactions that produce heat are called ____. When there is not enough oxygen present ____ combustion occurs. We get Carbon ____ (CO); and ____ (C). Soot is unburnt carbon. Carbon monoxide is invisible, ____ (can’t see it), ____ (can’t smell it) and ____ (poisonous).

Combustion

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