Question

n which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products?(1 point)
Responses

CH4 + O2 → CO2 + 2H2O
CH 4 + O 2 → CO 2 + 2H 2 O

Li2CO3 → LiO + CO2
Li 2 CO 3 → LiO + CO 2

CO2 + H2O → CH2OH + O2
CO 2 + H 2 O → CH 2 OH + O 2

Zn + 2HCl → H2 + ZnCl2

Answer 1

To determine which chemical equation has the same number of atoms in the reactants as in the products, we need to count the number of each type of atom on both sides of the equation for each option.

1. **CH4 + O2 → CO2 + 2H2O**
- Reactants: 1 C (from CH4), 4 H (from CH4), 2 O (from O2) → Total: 1 C + 4 H + 2 O = 7 atoms
- Products: 1 C (from CO2), 4 H (from 2H2O), 2 O (1 from CO2 + 1 from 2H2O) → Total: 1 C + 4 H + 3 O = 8 atoms
- NOT balanced (7 ≠ 8)

2. **Li2CO3 → LiO + CO2**
- Reactants: 2 Li (from Li2CO3), 1 C (from Li2CO3), 3 O (from Li2CO3) → Total: 2 Li + 1 C + 3 O = 6 atoms
- Products: 1 Li (from LiO), 1 O (from LiO), 1 C (from CO2), 2 O (from CO2) → Total: 1 Li + 1 O + 1 C + 2 O = 5 atoms
- NOT balanced (6 ≠ 5)

3. **CO2 + H2O → CH2OH + O2**
- Reactants: 1 C (from CO2), 2 O (from CO2), 2 H (from H2O) → Total: 1 C + 2 O + 2 H = 5 atoms
- Products: 1 C (from CH2OH), 2 H (from CH2OH), 1 O (from CH2OH), 2 O (from O2) → Total: 1 C + 2 H + 3 O = 6 atoms
- NOT balanced (5 ≠ 6)

4. **Zn + 2HCl → H2 + ZnCl2**
- Reactants: 1 Zn (from Zn), 2 H (from 2HCl), 2 Cl (from 2HCl) → Total: 1 Zn + 2 H + 2 Cl = 5 atoms
- Products: 1 Zn (from ZnCl2), 2 Cl (from ZnCl2), 2 H (from H2) → Total: 1 Zn + 2 H + 2 Cl = 5 atoms
- BALANCED (5 = 5)

The equation where the number of atoms in the reactants is the same as in the products is:

**Zn + 2HCl → H2 + ZnCl2**.