Decomposition Reaction Chemistry Example 1

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Example 1

easy
Write the balanced equation for the decomposition of water by electrolysis.

Solution

  1. 1
    Decomposition: one compound breaks into two or more simpler substances (AB→A+B\text{AB} \rightarrow \text{A} + \text{B}).
  2. 2
    H2O→H2+O2\text{H}_2\text{O} \rightarrow \text{H}_2 + \text{O}_2 (unbalanced).
  3. 3
    Balanced: 2H2O→2H2+O22\text{H}_2\text{O} \rightarrow 2\text{H}_2 + \text{O}_2. Check: H 4=4, O 2=2. ✓

Answer

2H2O→electricity2H2+O22\text{H}_2\text{O} \xrightarrow{\text{electricity}} 2\text{H}_2 + \text{O}_2
Decomposition reactions are the reverse of synthesis reactions. Many require energy input (heat, electricity, or light) to proceed, making them typically endothermic.

About Decomposition Reaction

A chemical reaction in which a single compound breaks down into two or more simpler substances (elements or simpler compounds), typically requiring an energy input.

Learn more about Decomposition Reaction →

More Decomposition Reaction Examples

Example 2 medium

When heated, calcium carbonate decomposes: [formula]. Classify this reaction and explain why heat is

Example 3 easy

Classify: [formula].

Example 4 hard

Hydrogen peroxide ([formula]) slowly decomposes into water and oxygen gas. Write the balanced equati

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