Classify the following as chemical or physical changes.
passing of electric current through water and the water breaking down into hydrogen and oxygen

Explanation

To classify the given processes as chemical or physical changes, we need to analyze each process based on the definitions of chemical and physical changes.

### Step-by-Step Solution:

1. **Understanding Physical Change:**
- A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. In a physical change, no new substances are formed.

2. **Understanding Chemical Change:**
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