Question

the reaction $2h_2o \
ightarrow 2h_2 + o_2$ is an example of a \\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_\\_ reaction.
options: synthesis, double replacement, combustion, decomposition

Explanation:

To determine the type of reaction, we analyze the given chemical reaction \(2H_2O
ightarrow 2H_2 + O_2\). A decomposition reaction is one where a single compound breaks down into two or more simpler substances. Here, water (\(H_2O\)) breaks down into hydrogen (\(H_2\)) and oxygen (\(O_2\)). Synthesis reactions combine substances, double replacement involves two compounds exchanging ions, and combustion typically involves a fuel reacting with oxygen (often producing \(CO_2\) and \(H_2O\)), so these don't fit. Thus, the reaction is a decomposition reaction.

Answer:

D. decomposition (assuming the options are labeled with identifiers, and "decomposition" is the correct choice among the given options: synthesis, double replacement, combustion, decomposition)