Question

Explain the following terms :
1. Reversible change
2. Irreversible change
3. Contraction
4. Evaporation
5. Condensation
6. Combustion ​

Answer 1

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Explain the following terms :

• Reversible change
• Irreversible change
• Contraction
• Evaporation
• Condensation
• Combustion

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• 1. Reversible change ➪ The changes in which original Substances can be recovered by reversing the process are called reversible changes, ( e.g ) When wax is heated , it melts and when the liquid wax is cooled , it solidifies.

• 2. Irreversible change ➪ The changes in whuch the original substances cannot be recovered by reversing the process are called irreversible changes, ( e.g ) formation of ash by burning coal.

• 3. Contraction ➪ It is the property of substance by which the size of the substance decrease on cooling.

• 4. Evaporation ➪ The process of conversion of liquid into vapour state by heating in known as Evaporation.

• 5. Condensation ➪ The process of conversion of vapour into liquid by cooling is known as Condensation.

• 6. Combustion ➪ Some substances start burning on heating. This is called Combustion. If we light a candle, The wax in the wicks burns.

Answer 2

Answer:

• 1. Reversible change ➪ The changes in which original Substances can be recovered by reversing the process are called reversible changes, ( e.g ) When wax is heated , it melts and when the liquid wax is cooled , it solidifies.
• 2. Irreversible change ➪ The changes in whuch the original substances cannot be recovered by reversing the process are called irreversible changes, ( e.g ) formation of ash by burning coal.
• 3. Contraction ➪ It is the property of substance by which the size of the substance decrease on cooling.
• 4. Evaporation ➪ The process of conversion of liquid into vapour state by heating in known as Evaporation.
• 5. Condensation ➪ The process of conversion of vapour into liquid by cooling is known as Condensation.
• 6. Combustion ➪ Some substances start burning on heating. This is called Combustion. If we light a candle, The wax in the wicks burns