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प्रश्न
Classify the following as a physical or a chemical change.
Burning of paper
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उत्तर
Chemical change
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संबंधित प्रश्न
Changes in which only ______ properties of a substance change are called physical changes.
Dissolving salt in water is a reversible change.
Fill in the blank
Revolution of the earth around the sun is a ________ change.
Fill in the blank.
Growing of a seedling into a plant is _______ change.
Write true or false
A natural change can also be a desirable change.
Write true or false
Decomposition of leaves is a fast change.
Fill in the blank.
The reaction in which energy is evolved is called
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Slow and fast change.
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.
Wood to sawdust:______:: Wood to Ash: Chemical change
