Moist iron wool was inverted over water. The set up was left to stand for 2 days
![ChemF2midt1q10](https://www.easyelimu.com/images/form_2_past_papers/mid_term_2021/chemf2mid/ChemF2midt1q10.PNG)
- Explain whether rusting is a physical or chemical reaction
- Write an expression using X and Y to show the percentage of Oxygen
- What would be the effect of using a larger piece of iron wool? Explain.