7. Which of the following is the best example of a chemical change? Cutting hair A Melting butter C Shredding cheese Couring milk

To determine which of the options represents the best example of a chemical change, let's first define what a chemical change is. A chemical change involves a transformation that alters the chemical composition of a substance, resulting in the formation of new substances. This is different from physical changes, which do not change the chemical composition. Now, let's analyze each option: 1. **Cutting hair**: This is a physical change. The hair is still hair; its composition hasn't changed. 2. **Melting butter**: This is also a physical change. The butter changes from solid to liquid, but its chemical composition remains the same. 3. **Shredding cheese**: This is a physical change as well. The cheese is still cheese; it has just been cut into smaller pieces. 4. **Curing milk**: This is a chemical change. Curing milk involves the process of fermentation or the addition of certain bacteria, which changes the chemical composition of the milk, resulting in products like cheese or yogurt. Based on this analysis, the best example of a chemical change from the options provided is **Curing milk**.