Question

in a _________ reaction, two or more elements or compounds form one product. combination double replacement combustion single replacement decomposition

Explanation:

A combination reaction involves two or more reactants (elements or compounds) combining to form a single product. For example, \(2H_2 + O_2
ightarrow 2H_2O\) (hydrogen and oxygen combining to form water). A double - replacement reaction has the form \(AB+CD
ightarrow AD + CB\). A combustion reaction is a reaction with oxygen (e.g., \(CH_4+2O_2
ightarrow CO_2 + 2H_2O\)). A single - replacement reaction has the form \(A + BC
ightarrow AC + B\). A decomposition reaction has one reactant breaking down into two or more products (e.g., \(2H_2O
ightarrow 2H_2+O_2\)).

Answer:

combination