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ICSE Class 7 Chemistry Question 13 of 14

Matter and Its Composition — Question 2

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Question 2

Select the correct answer from the choice in bracket to complete each sentence:

  1. Matter is defined as anything that occupies ............... & has ............... [mass/volume/space].

  2. The three states of matter are classified on the basis of differences of certain ............... [chemical/physical] properties.

  3. Matter made up of one kind of particles is said to be ............... [heterogeneous/homogeneous]

  4. Particles in a gas possess ............... [least/very large] kinetic energy.

  5. The intermolecular force of attraction is ............... [negligible/maximum] in solids.

Answer

  1. Matter is defined as anything that occupies space & has mass.

  2. The three states of matter are classified on the basis of differences of certain physical properties.

  3. Matter made up of one kind of particles is said to be homogeneous.

  4. Particles in a gas possess very large kinetic energy.

  5. The intermolecular force of attraction is maximum in solids.

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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