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प्रश्न
Given reason:
Cutting of a cloth piece is a physical change, though it cannot be reversed.
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उत्तर
Because it does not change chemical composition of cloth and the change is only in the state, size, shape, colour, texture or the smell of some or all of the substances that undergo physical change.
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संबंधित प्रश्न
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
Fill in the blank
change in which the substance can be brought back to its original state is called a ............... change.
Tick (√) the correct alternative from the choice given for the following statement
Which one of the following is volatile in nature ?
Classify the following as physical or chemical changes :
Breaking of a glass tumbler
Is a change of state of matter – a physical or a chemical change. Give reasons.
State which of the following terms connected with change of state of matter i.e.
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
pertain to –
- Conversion of a liquid into a vapour or gas.
- Conversion of a liquid into a solid.
- Conversion of a solid into a liquid on heating.
Name the following.
The product obtained during a physical change when water converts from a liquid into a solid.
Wood to sawdust:______:: Wood to Ash: Chemical change
Sublimation of Iodine is a ______.
Water is known as a universal solvent. Why?
