Question

The following reaction shows the production of hydrogen gas from water. This chemical reaction should be classified as _____.

2 H2O 2H2 + O2

synthesis
decomposition
single replacement
double displacement
neutralization

Answer 1

The following reaction shows the production of hydrogen gas from water. This chemical reaction should be classified as decomposition ( second choice)

Answer 2

B. Decomposition

Step-by-step explanation:

`2 H_2 O>2H_2+O_2`

Decomposition is the type of reaction in which a compound is broken into smaller compounds or broken into its elements

`AB>A+B\\\\CaCO_3>CaO+CO_2`

Synthesis is just opposite to decomposition reaction, Elements combine to form a compound

`A+B>AB\\\\CaO+CO_2>CaCO_3`

Single replacement reactions in which replacement takes place at a single place

`A+BC>AB+C\\\\Zn(s)+CuCl_2 (aq)>ZnCl_2 (aq)+Cu(s)`

Double replacement reactions in which replacement occurs two places

`AB+CD>AD+BC\\\\AgNO_3+NaCl>AgCl+NaNO_3`

Neutralization reaction is the reaction between an acid and a base to form salt and water

`HCl+NaOH>NaCl+H_2 O`