Question

Differentiate between:
a. Reversible and irreversible b. Physical and chemical changes
c. Evaporation and condensation
d. expansion and contraction​

Answer 1

$\large{\underline{\underline{\bf{Answer~:}}}}$

$\pmb{\frak\pink{Reversible ~and ~Irreversible~changes~:-}}$

• ❐ Reversible Change ➠ The change which reverses by reversing the conditions, called Reversible Change. For example, Ice when heated gives water, etc.

• ❐ Irreversible Change ➠ The change which is permanent and cannot change by changing the conditions is called Irreversible Change. For example, Curdling of milk, etc.

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$\pmb{\frak\pink{Physical ~and ~ Chemical~changes~:-}}$

• ❐ Physical Change ➠ A change in which no new substance is formed, called Physical Change. For example, The melting of ice, etc.

• ❐ Chemical Change ➠ A change in which new substance is formed, called Chemical Change. For example, The burning of coal or wood, etc.

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$\pmb{\frak\pink{Evaporation~and~ Condensation~:-}}$

• ❐ Evaporation ➠ The process of changing of a liquid into vapour below its boiling point, called Evaporation.

• ❐ Condensation ➠ The conversion of a liquid into solid form is known as Condensation. This process is also known as Freezing.

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$\pmb{\frak\pink{Expansion~and~ Contraction~:-}}$

• ❐ Expansion ➠ When heat is provided to the substance, the size of the substance increases, this process is known as Expansion.

• ❐ Contraction ➠ When the substance becomes cool, the size of the substance decreases, this process is known as Contraction.

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Answer 2

❐ Reversible Change ➠ The change which reverses by reversing the conditions, called Reversible Change. For example, Ice when heated gives water, etc.

❐ Irreversible Change ➠ The change which is permanent and cannot change by changing the conditions is called Irreversible Change. For example, Curdling of milk, etc.