Question

types of reactions
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in which type of chemical reaction do two or more substances combine to form one substance?
synthesis
decomposition
single replacement
double replacement

Explanation:

A synthesis reaction is defined as a chemical reaction where two or more reactants combine to produce a single, more complex product. Decomposition reactions break one substance into multiple products, single replacement reactions involve one element replacing another in a compound, and double replacement reactions swap ions between two compounds.

Answer:

synthesis