Topic Details (Notes format)

Changes Around Us

Subject: General Science

Book: NCERT Science Class 6

Changes occur everywhere around us and can be classified as:
- **Reversible changes**: Can be reversed (example: melting of ice).
- **Irreversible changes**: Cannot be reversed (example: burning of paper).
- **Physical changes**: No new substance is formed (example: tearing of paper).
- **Chemical changes**: A new substance is formed (example: rusting of iron).
- **Applications in daily life**: Cooking involves chemical changes, freezing water is a physical change.

**Possible Exam Questions:**
1. Define reversible and irreversible changes with examples.
2. How is rusting of iron an example of a chemical change?
3. Explain the difference between physical and chemical changes.
4. Why is cooking considered an irreversible change?
5. Discuss the importance of reversible changes in industrial applications.