Topic Details (Notes format)

Is Matter Around Us Pure?

Subject: General Science

Book: NCERT Science Class 9

Matter can be classified as pure substances and mixtures.
- **Types of Substances**:
- Elements: Made of one type of atom (gold, oxygen).
- Compounds: Made of two or more atoms chemically combined (water, salt).
- **Mixtures**:
- Homogeneous (uniform composition) - Sugar in water.
- Heterogeneous (uneven composition) - Sand in water.
- **Separation Techniques**:
- Filtration, distillation, chromatography.

**Possible Exam Questions:**
1. Differentiate between elements and compounds.
2. What are the properties of homogeneous and heterogeneous mixtures?
3. Explain distillation as a separation technique.
4. Why is water called a universal solvent?
5. Discuss the differences between pure substances and mixtures.