Question

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Answer 1

Answer:

synthesis

Explanation:

Step 1: Data given

Decomposition = a reaction in which a compound breaks down into two or more simpler substances. The general form of a decomposition reaction is:

AB→A+B

Synthesis =  A reaction that occurs when one or more compounds combines to form a complex compound:

A + B → AB

Double replacement: a reaction in which the positive and negative ions of two ionic compounds exchange places to form two new compounds.

The general form of a double-replacement reaction is:

AB+CD→AD+BC

Combustion reaction = a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve  O2  as one reactant.

single replacement = A reaction in which one element replaces a similar element in a compound. For example, a metal replaces an other metal.

The general form of a single-replacement (also called single-displacement) reaction is:

A+BC→AC+B

The reaction Na2O + H2O → 2NaOH

⇒ Does not involve O2 = NOT a combustion reaction

⇒ There is no replacement of 1 or more elements,.. This reaction is not a single replacement, neither a double replacement.

⇒ A compound does not break down into smaller substances = NOT a decomposition

The compounds starts from 2 simple substance to form a more compelx compound = a synthesis