Question

Select ALL the correct answers.
Which of the following equations are balanced correctly?

2Ag2O → 4Ag + O2
Cu + H2O → CuO + H2
2C4H10 + 13O2 → 8CO2 + 10H2O
Zn + HCl → ZnCl2 + H2

Answer 1

Let's analyze each equation to determine if they are balanced correctly:

1. **2Ag2O → 4Ag + O2**
- Left side: 4 Ag (from 2Ag2O) and 2 O (from 2Ag2O)
- Right side: 4 Ag (from 4Ag) and 2 O (from O2)
- This equation is balanced correctly.

2. **Cu + H2O → CuO + H2**
- Left side: 1 Cu and 2 H (from H2O) and 1 O (from H2O)
- Right side: 1 Cu (from CuO), 2 H (from H2), and 1 O (from CuO)
- This equation is balanced correctly.

3. **2C4H10 + 13O2 → 8CO2 + 10H2O**
- Left side: 8 C (from 2C4H10), 20 H (from 2C4H10), and 26 O (from 13O2)
- Right side: 8 C (from 8CO2), 20 H (from 10H2O), and 26 O (from 8CO2 and 10H2O)
- This equation is balanced correctly.

4. **Zn + HCl → ZnCl2 + H2**
- Left side: 1 Zn and 1 H (from HCl) and 1 Cl (from HCl)
- Right side: 1 Zn (from ZnCl2), 2 Cl (from ZnCl2), and 2 H (from H2)
- This equation is not balanced correctly.

Based on the analysis, the correctly balanced equations are:

- **2Ag2O → 4Ag + O2**
- **Cu + H2O → CuO + H2**
- **2C4H10 + 13O2 → 8CO2 + 10H2O**

Therefore, the correct answers are the first three equations.