When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.

Explanation

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The two substances being mixed are baking soda (sodium bicarbonate, NaHCO3) and lemon juice (which contains citric acid).

2. **Understand the Reaction**:
- When baking soda is mixed with lemon juice, a chemical reaction occurs. The citric acid in lemon juice reacts with the baking soda.

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