Answer:
Equations 1, 2 and 4 are balanced correctly
Step-by-step explanation:
To determine which equations are balanced correctly, we need to ensure that the number of atoms of each element is the same on both sides of the equation. Let's analyze each equation:
1. Zn + HCl → ZnCl2 + H2
This equation is balanced correctly. On the left side, we have 1 zinc (Zn) atom and 2 hydrogen (H) atoms, and on the right side, we have 1 zinc (Zn) atom, 2 chlorine (Cl) atoms, and 2 hydrogen (H) atoms.
2. 2C4H10 + 13O2 → 8CO2 + 10H2O
This equation is balanced correctly. On the left side, we have 8 carbon (C) atoms and 20 hydrogen (H) atoms, and on the right side, we have 8 carbon (C) atoms and 20 hydrogen (H) atoms. Additionally, we have 26 oxygen (O) atoms on both sides.
3. Cu + H2O → CuO + H2
This equation is not balanced correctly. On the left side, we have 1 copper (Cu) atom and 2 hydrogen (H) atoms, but on the right side, we have 1 copper (Cu) atom, 1 oxygen (O) atom, and 2 hydrogen (H) atoms. To balance this equation, we need to add a coefficient of 2 in front of H2O, resulting in:
Cu + 2H2O → CuO + H2
4. 2Ag2O → 4Ag + O2
This equation is balanced correctly. On the left side, we have 4 silver (Ag) atoms and 2 oxygen (O) atoms, and on the right side, we have 4 silver (Ag) atoms and 2 oxygen (O) atoms.
Therefore, the correctly balanced equations are:
- Zn + HCl → ZnCl2 + H2
- 2C4H10 + 13O2 → 8CO2 + 10H2O
- 2Ag2O → 4Ag + O2