List two observation you would record in your notebook 30 minutes after adding iron filling to copper sulphate solution.

Explanation

To answer the question about the observations after adding iron filings to copper sulfate solution, we can break down the process step by step.

### Step-by-Step Solution:

1. **Understanding the Reaction**:
- When iron filings (Fe) are added to copper sulfate solution (CuSO4), a chemical reaction occurs. Iron is more reactive than copper and displaces copper from the solution.

2. **Chemical Equation**:
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