Subject: General Science
Book: NCERT Science Class 9
Everything around us is made of matter.
- **States of Matter**:
- Solid, Liquid, Gas.
- **Properties of Matter**:
- Can change state with temperature and pressure.
- **Processes**:
- Evaporation: Liquid to gas.
- Condensation: Gas to liquid.
- Sublimation: Solid to gas without turning into liquid.
**Possible Exam Questions:**
1. Define matter and its states.
2. What are the factors affecting evaporation?
3. Explain the concept of sublimation with examples.
4. How do temperature and pressure affect the state of matter?
5. Why do gases have neither fixed shape nor fixed volume?
What is the chemical formula for carbon dioxide?
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