10) of the reactions below, which one is a decomposition reaction? NH4Cl → NH3 + HC1 2Mg +022MgO ad ating menye senibrusotie ad 2N2 + 3H2 → 2NH3 local 2CH4 + 402 → 2CO2 + 4H2O

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10) Of the reactions below, which one is a decomposition reaction?

1. \( \text{NH}_4\text{Cl} \rightarrow \text{NH}_3 + \text{HCl} \)

2. \( 2\text{Mg} + \text{O}_2 \rightarrow 2\text{MgO} \)

3. \( \text{N}_2 + 3\text{H}_2 \rightarrow 2\text{NH}_3 \)

4. \( 2\text{CH}_4 + 4\text{O}_2 \rightarrow 2\text{CO}_2 + 4\text{H}_2\text{O} \)
   
**Explanation:**

- **Decomposition Reaction**: A decomposition reaction occurs when a single compound breaks down into two or more simpler substances. In this list, the first reaction is the decomposition of ammonium chloride into ammonia and hydrochloric acid.

- **Synthesis Reaction**: In the second reaction, magnesium reacts with oxygen to form magnesium oxide, illustrating a synthesis reaction where two or more substances combine to form a compound.

- **Combination Reaction**: The third reaction combines nitrogen and hydrogen to form ammonia, representing a classic example of a combination reaction.

- **Combustion Reaction**: The fourth reaction involves methane reacting with oxygen to produce carbon dioxide and water, characteristic of a combustion reaction where a hydrocarbon burns in the presence of oxygen.
Transcribed Image Text:10) Of the reactions below, which one is a decomposition reaction? 1. \( \text{NH}_4\text{Cl} \rightarrow \text{NH}_3 + \text{HCl} \) 2. \( 2\text{Mg} + \text{O}_2 \rightarrow 2\text{MgO} \) 3. \( \text{N}_2 + 3\text{H}_2 \rightarrow 2\text{NH}_3 \) 4. \( 2\text{CH}_4 + 4\text{O}_2 \rightarrow 2\text{CO}_2 + 4\text{H}_2\text{O} \) **Explanation:** - **Decomposition Reaction**: A decomposition reaction occurs when a single compound breaks down into two or more simpler substances. In this list, the first reaction is the decomposition of ammonium chloride into ammonia and hydrochloric acid. - **Synthesis Reaction**: In the second reaction, magnesium reacts with oxygen to form magnesium oxide, illustrating a synthesis reaction where two or more substances combine to form a compound. - **Combination Reaction**: The third reaction combines nitrogen and hydrogen to form ammonia, representing a classic example of a combination reaction. - **Combustion Reaction**: The fourth reaction involves methane reacting with oxygen to produce carbon dioxide and water, characteristic of a combustion reaction where a hydrocarbon burns in the presence of oxygen.
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