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

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