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प्रश्न
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
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उत्तर
Ice, water and water vapour look different and display different physical properties but they are chemically the same.
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संबंधित प्रश्न
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
Fill in the blank.
An earthquake is a .................. change.
Classify the following changes as physical or chemical:- melting of a solid (wax)
Write true or false
Rusting of iron is a chemical change.
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
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.
Potassium chloride is added to water and stirred. A salt solution is obtained, which is then boiled, leaving behind a residue.
- Is the above change physical or chemical?
- Name the residue which remains behind after the salt solution is boiled.
- Is the change reversible or not reversible?
- Are the composition and properties of the original substance altered?
- Give a reason why the above experimentation would not be possible if calcium carbonate was taken in place of potassium chloride.
When ice melts to form water, change occurs in its
Cutting a log of wood into pieces is a chemical change.
