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प्रश्न
Select the chemical changes from the following list of changes
Vaporisation of water into water vapour.
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उत्तर
Change of water into water vapours is a PHYSICAL change as no change in composition, only state changes, is reversible change on cooling vapour water is formed.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Cutting of trees
Try segregating the things around you as pure substances or mixtures.
Write true or false for the statement
Decomposition of leaves is a fast change.
State four differences between physical and chemical changes.
Tick (√) the correct alternative from the choice given for the following statement.
An example of both physical and chemical change is
A physical change is temporary. Explain.
Fill in the blank.
The process of a liquid changing into a solid is called ________
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.
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.
______ is the substance that is dissolved in a solvent.
