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ICSE Class 7 Chemistry Question 7 of 14

Matter and Its Composition — Question 1

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Question 3

Each of the three states of matter has mass. Explain with the help of simple experiments that each state of matter has mass.

Answer

Solids

Procedure — A solid placed on the scale, causes the scale to tilt towards one side.
Conclusion — The scale tilts due to the mass of the solid, hence all solids have mass.

Liquids

Procedure — A liquid placed on the scale, causes the scale to tilt towards one side.
Conclusion — The scale tilts due to mass of the liquid, hence all liquids have mass.

Gases

Procedure — A balloon placed on the scale, causes the scale to tilt towards one side.
Conclusion — The scale tilts due to mass of the gas, hence all gases have mass.

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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