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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
What are reversible and irreversible changes ? Give one example for each.
Write true or false
A natural change can also be a desirable change.
Name two reversible changes.
What is a chemical change ? Give two examples of chemical changes.
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.
Natural and man-made 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.
Select the correct answer from the choice given below to complete the sentence
A change in which a substance retains its identity is a
______ change.
Name the following.
The product obtained during a physical change when water converts from a liquid into a solid.
Which of the following is not a physical change?
