Question

in which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products?

ch4 + o2 -> co2 + 2h2o
Zn + 2hci -> h2 + zncl2
li2co3 -> lio + co2
co2 + h2o -> ch2oh + o2

Answer 1

only one answer

Answer 2

To determine which of the given chemical equations has the same number of atoms in the reactants as in the products, we can count the atoms on both sides of each equation.

1. **CH₄ + O₂ → CO₂ + 2H₂O**
- Reactants: C (1) + H (4) + O (2) = 1 + 4 + 2 = 7 atoms
- Products: C (1) + O (2) + H (4) = 1 + 2 + 4 = 7 atoms
- **Total: 7 atoms on both sides.**

2. **Zn + 2HCl → H₂ + ZnCl₂**
- Reactants: Zn (1) + H (2) + Cl (2) = 1 + 2 + 2 = 5 atoms
- Products: H (2) + Zn (1) + Cl (2) = 2 + 1 + 2 = 5 atoms
- **Total: 5 atoms on both sides.**

3. **Li₂CO₃ → LiO + CO₂**
- Reactants: Li (2) + C (1) + O (3) = 2 + 1 + 3 = 6 atoms
- Products: Li (1) + O (1) + C (1) + O (2) = 1 + 1 + 1 + 2 = 5 atoms
- **Total: 6 atoms (reactants) vs 5 atoms (products).**

4. **CO₂ + H₂O → CH₂OH + O₂**
- Reactants: C (1) + O (2) + H (2) + O (1) = 1 + 2 + 2 + 1 = 6 atoms
- Products: C (1) + H (2) + O (1) + O (2) = 1 + 2 + 1 + 2 = 6 atoms
- **Total: 6 atoms on both sides.**

Upon evaluating all the equations:
- The equations **CH₄ + O₂ → CO₂ + 2H₂O**, **Zn + 2HCl → H₂ + ZnCl₂**, and **CO₂ + H₂O → CH₂OH + O₂** all have the same number of atoms in the reactants and products.

The equation **Li₂CO₃ → LiO + CO₂** does not balance.

Thus, the equations with equal total atoms on both sides are **1, 2, and 4**:
1. CH₄ + O₂ → CO₂ + 2H₂O
2. Zn + 2HCl → H₂ + ZnCl₂
4. CO₂ + H₂O → CH₂OH + O₂

Answer 3

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

**CH₄ + O₂ → CO₂ + 2H₂O**.

This equation has 7 atoms on both sides.