Question

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

2 H2O 2H2 + O2

1)synthesis
2)decomposition
3)single replacement
4)double displacement
5)neutralization

Answer 1

This chemical reaction should be classified as a decomposition type of reaction, as basically water is decomposed using appropriate methods, chemically to produce hydrogen gas and oxygen gas. Both elements are found within the molecular formula of water. A decomposition reaction is when a compound is degraded and or broke down to form elements and other small compounds that constitute or make up the original compound.

Answer 2

Answer: Option (2) is the correct answer.

Explanation:

When a compound dissociates into two or more products then this type of reaction is known as decomposition reaction.

For example, $2H_{2}O \rightarrow 2H_{2} + O_{2}$

Here, water molecules dissociate into hydrogen and oxygen atoms. Therefore, this chemical reaction should be classified as decomposition reaction.