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Changing States of Matter

1.State the Difference Between Reversible and Irreversible Changes?

The differences between reversible and irreversible changes are-

Reversible change Irreversible change
A change that can be reversed is called reversible change. A change that cannot be reversed is called irreversible change.
After this change, the matter can return to its original state. After this change, the matter cannot return to its original state.

Example- Evaporation.

Example- Rusting of iron.


2.Categorise the Following Into Sublimable and Non-sublimable Substances.
Dry Ice, Iodine, Sugar, Camphor, Naphthalene, Arsenic, Salt, Alum.

The list of substances given above is categorised as follows:

Sublimable substances Non-sublimable substances
  1. Dry ice
  2. Iodine
  3. Camphor
  4. Naphthalene
  5. Arsenic
  1. Sugar
  2. Salt
  3. Alum


3.Write Which of the Following Are Reversible and Irreversible Changes.

  1. Irreversible change.
  2. Irreversible change.
  3. Reversible change.
  4. Reversible change.
  5. Irreversible change.
  6. Irreversible change.


4.What Is the Boiling and Freezing Point of Water?

  • The boiling point of water is 100°C.
  • The freezing point of water is 0°C.


5.Explain a Few Factors Affecting the Rate of Evaporation.

  • Temperature: The rate of evaporation increases with an increase in the temperature.
  • Wind velocity: The rate of evaporation increases with an increase in wind velocity.
  • Surface area: Larger the surface area higher is the rate of evaporation.


6.Why Are Both Gases and Liquids Called Fluids?

  • Gases and liquids are called fluids as they can flow due to weak intermolecular forces between their molecules.
  • They do not have fixed shapes and sizes and take the shape of their container.


7.What Is the Fourth State of Matter?

The fourth state of matter is plasma. Plasma is fluid and a good conductor of electricity.


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