ICSE Class 7 Chemistry
Question 6 of 14
Matter and Its Composition — Question 14
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Question Question 13
Classify the following into solid, liquid and gas:
Coal, kerosene, wood, oxygen, sugar, blood, water vapour, milk, wax.
| Solid | Liquid | Gas |
|---|---|---|
| Coal | kerosene | oxygen |
| Wood | blood | water vapour |
| Sugar | milk | |
| Wax |
ICSE Class VII Chemistry Chapter 1 15 Marks
Matter and Its Composition — Quick Study Guide
Everything around us is made of matter. Matter has mass and occupies space. It exists in three states: solid, liquid, and gas. Each state has unique properties based on how particles are arranged and move.
Key Definitions
- Matter: Anything that has mass and occupies space
- Solid: Fixed shape and volume, particles closely packed
- Liquid: Fixed volume but no fixed shape, particles slide over each other
- Gas: No fixed shape or volume, particles move freely
- Diffusion: Spreading of particles from high concentration to low concentration
- Sublimation: Direct change from solid to gas (e.g., camphor)
- Latent heat: Heat absorbed during change of state without temperature change
Important Comparisons
Evaporation vs Boiling: Evaporation is a surface phenomenon at all temperatures (slow, no bubbles). Boiling occurs throughout the liquid at a specific temperature (rapid, with bubbles).
Exam Tips
- Learn all six interconversion processes with examples
- Practice questions on predicting state at a given temperature
- Know factors affecting evaporation (4 factors)
- Understand why pressure cooker cooks faster
Bright Tutorials | ICSE Class VII Chemistry | Chapter 1: Matter and Its Composition | Contact: 9403781999