Matter and Its Composition — Question 7
Back to all questions(a) Solid — A solid is that state of matter which has a definite shape and a definite volume. The two examples are gold, wood.
(b) Liquid — A liquid is that state of matter which has a definite volume but no definite shape. The two examples are water, alcohol.
(c) Gas — A gas is that state of matter which has neither a definite shape nor a definite volume. The two examples are hydrogen, oxygen.
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
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