What reactants form a combustion reaction?
O
A. A hydrocarbon and oxygen
O
B. Hydrogen and water vapor
O
C. A hydrocarbon and water
O
D. Water vapor and oxygen

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

explanation:

the answer is 1 i believe

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