Question

Balance the following chemical equation and classify them into their different classes;
c) FeS + HCL produce FeCl2 +H2S
d) C2H6 + O2 produce CO2+ H2O
e) NO +O2 produce NO2

Answer 1

Let's begin by balancing the chemical equations provided and then classify each reaction into its appropriate class.

### c) Balancing the equation:
**Unbalanced equation:**
\[ \text{FeS} + \text{HCl} \rightarrow \text{FeCl}_2 + \text{H}_2\text{S} \]

**Balanced equation:**
\[ \text{FeS} + 2\text{HCl} \rightarrow \text{FeCl}_2 + \text{H}_2\text{S} \]

**Classification:**
This reaction is a **double displacement reaction** (or double replacement reaction) because the anions and cations switch partners.

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### d) Balancing the equation:
**Unbalanced equation:**
\[ \text{C}_2\text{H}_6 + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O} \]

**Balanced equation:**
\[ 2\text{C}_2\text{H}_6 + 7\text{O}_2 \rightarrow 4\text{CO}_2 + 6\text{H}_2\text{O} \]

**Classification:**
This reaction is a **combustion reaction** because it involves the burning of a hydrocarbon (C₂H₆, ethane) in the presence of oxygen to produce carbon dioxide and water.

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### e) Balancing the equation:
**Unbalanced equation:**
\[ \text{NO} + \text{O}_2 \rightarrow \text{NO}_2 \]

**Balanced equation:**
\[ 2\text{NO} + \text{O}_2 \rightarrow 2\text{NO}_2 \]

**Classification:**
This reaction is an **oxidation-reduction (redox) reaction** as nitrogen monoxide (NO) is being oxidized to nitrogen dioxide (NO₂).

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### Summary:
- **c)** Balanced: \(\text{FeS} + 2\text{HCl} \rightarrow \text{FeCl}_2 + \text{H}_2\text{S}\) | Type: Double displacement
- **d)** Balanced: \(2\text{C}_2\text{H}_6 + 7\text{O}_2 \rightarrow 4\text{CO}_2 + 6\text{H}_2\text{O}\) | Type: Combustion
- **e)** Balanced: \(2\text{NO} + \text{O}_2 \rightarrow 2\text{NO}_2\) | Type: Oxidation-reduction (redox)