Question

what type of reaction shows a substance breaking down into two or more substances?
double replacement
single replacement
synthesis
decomposition

Explanation:

In chemical reactions, a decomposition reaction is defined as a reaction where a single compound breaks down into two or more simpler substances (elements or compounds). Double replacement involves swapping ions between two compounds, single replacement is one element replacing another in a compound, and synthesis is combining substances to form a more complex compound. So the reaction where a substance breaks down into two or more substances is decomposition.

Answer:

decomposition