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प्रश्न
What will you take into account while identifying the following?
A physical change in a substance.
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उत्तर
Physical changes are those changes in which only the forms of substances get modified; the chemical natures and compositions of the substances involved are not altered.
Characteristics:
- No new substance is formed during a physical change.
- Most physical changes can be reversed easily.
- The chemical composition of a substance undergoing physical change remains the same.
संबंधित प्रश्न
State the various conditions that favour the process of evaporation.
Fill in the blank
Revolution of the earth around the sun is a ________ change.
Classify the following as physical or chemical change :
Growth of a plant
Classify the following as a physical or a chemical change.
Burning of coal
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
Give a reason why – Addition of zinc nitrate to water is a physical change but, the addition of zinc to dilute nitric acid is a chemical change.
Give a reason why rusting of iron is a chemical change but, the magnetization of iron is a physical change.
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
Physical Change: Boiling::Chemical Change: ______.
Water is the universal solvent. Why?
