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प्रश्न
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
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उत्तर
There is no change in the composition of the substance during a physical change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
State the various conditions that favour the process of evaporation.
What are reversible and irreversible changes ? Give one example for each.
State whether the following is physical or chemical changes.
cutting wood into small pieces —
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
Fill in the blank with the appropriate word of the statement given below:
If a change is permanent and irreversible it is considered a _________ change.
Water is the universal solvent. Why?
Keeping a stone in sunlight for few hours is ______.
