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प्रश्न
Classify the following as chemical or physical change:
Melting of butter in a pan
विकल्प
Chemical change
Physical change
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उत्तर
Physical change
Explanation:
Melting butter in a pan is a physical transformation since there is no change in the chemical composition of butter; only its physical state changes from solid to liquid.
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संबंधित प्रश्न
Fill in the blank
change in which the substance can be brought back to its original state is called a ............... change.
What are reversible and irreversible changes ? Give one example for each.
State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
Write true or false
Burning of paper and formation of curd are reversible changes.
What will you take into account while identifying the following?
A chemical change in a substance.
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible 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.
Digestion of food is a physical change.
Explain the characteristics of physical change with examples.
