Question

types of chemical reactions
type of reaction
combination (synthesis)
decomposition
single displacement
double displacement
combustion
general equation
a + b → ab
ab → a + b
a + bc → ac + b
ab + cd → ad + bc
cxhy + o2 → co2 + h2o
multiple - choice question
what are the reactants of a combustion reaction?
water
carbon dioxide
hydrocarbon
oxygen
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Explanation:

In a combustion reaction, a substance (usually a hydrocarbon) reacts with oxygen. The general form for the combustion of a hydrocarbon \(C_xH_y\) is \(C_xH_y + O_2
ightarrow CO_2 + H_2O\). Here, the reactants are the hydrocarbon (which is a type of organic compound made of carbon and hydrogen - can be simply called hydrocarbon in this context as the formula \(C_xH_y\) represents it) and oxygen (\(O_2\)). The products are carbon dioxide (\(CO_2\)) and water (\(H_2O\)). So, to find the reactants, we look at the left - hand side of the combustion reaction equation.

Answer:

Hydrocarbon, Oxygen