Course Content
Theme 02: Physical and chemical Changes
Theme 03: Elements, Compounds and Mixtures
Theme 04: Atomic Structure
Theme 05: Language of Chemistry
Theme 06: Metals and Non-Metals.
Theme 07: Air and Atmosphere
ICSE Chemistry – 7
About Lesson

In our exploration of Matter and its Composition in Class 7 Chemistry, we’ve laid the foundation for understanding the fundamental building blocks of the universe. Here’s a concise summary of what we’ve covered:

  1. Introduction to Matter:

   We began by defining what matter is—anything that occupies space and has mass. Whether it’s a solid, liquid, or gas, matter surrounds us in various forms.

  1. States of Matter:

   Matter exists in three primary states—solid, liquid, and gas. We delved into the characteristics of each state and how substances can transition between them.

  1. Particles of Matter:

   Examining matter on a microscopic level, we explored the concept of particles. Understanding that all matter is composed of tiny particles helped us comprehend the behavior and properties of substances.

  1. Properties and Changes:

   We studied the distinctive properties of matter, both physical and chemical. Changes in matter were classified into physical changes, where the substance retains its identity, and chemical changes, which result in the formation of new substances.

  1. Mixtures and Solutions:

   Matter often comes together to form mixtures. We distinguished between homogeneous mixtures (solutions) and heterogeneous mixtures, understanding how substances interact on a molecular level.

  1. Separation Techniques:

   Practical skills were honed through the exploration of separation techniques. We learned how to separate components of mixtures based on their physical properties.

  1. Density and Buoyancy:

   Connecting theory to real-world applications, we explored density and buoyancy, understanding why certain objects float while others sink.

  1. Conservation of Mass:

   Through experiments and discussions, we discovered the principle of the conservation of mass, emphasizing that mass is neither created nor destroyed in chemical reactions.

This journey through Matter and its Composition serves as the bedrock for our further exploration of the captivating world of chemistry. As we move forward, these foundational concepts will continue to play a vital role in our understanding of more advanced topics. Get ready for the next phase of our chemical adventure!


  1. Matter has mass and occupies space.
  2. Matter is made up of atoms and molecules.
  3. Atoms are the smallest particles of matter which may or may not have independent existence.
  4. Molecules are capable of independent existence. They are made up of atoms of same kind or different kinds.
  5. The atoms and molecules are in random motion.
  6. There are gaps between the molecules of matter called as inter molecular space.
  7. There exists a force of attraction between the molecules known as inter molecular force of attraction.
  8. Matter exists in three states : solids, liquid and gas.
  9. Matter can change from one state to another on changing temperature and pressure.
  10. The change of state of a matter from one form into another is called inter conversion of states of matter.