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प्रश्न
Name two reversible changes.
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उत्तर
Melting of ice.
Dissolving of salt in water.
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संबंधित प्रश्न
Write short answer.
Give an example of desirable change which can also be undesirable
Classify the following changes as physical or chemical:- melting of a solid (wax)
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
State whether the following is physical or chemical changes.
cutting wood into small pieces —
Write true or false
Cutting of paper into pieces is a chemical change.
Classify the following as physical or chemical changes :
Breaking of a glass tumbler
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.
Select the chemical changes from the following list of changes
Rotting of eggs.
What type of change is colouring of a paper?
Natural changes which take place in nature on their own, are beyond the control of human being.
