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प्रश्न
Changes in which only ______ properties of a substance change are called physical changes.
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उत्तर
Changes in which only physical properties of a substance change are called physical changes.
Explanation:
Physical changes alter only the physical properties, not the chemical composition, of a substance.
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संबंधित प्रश्न
Tick the most appropriate answer
2. Melting of ice is a
- reversible change
- irreversible change
- chemical change
- none of these
Write true or false
Decomposition of leaves is a fast change.
Classify the following as physical or chemical change :
Growth of a plant
Classify the following as physical or chemical changes :
Breaking of a glass tumbler
Classify the Following as a Physical Or a Chemical Change.
Making of a Sugar Solution
What will you take into account while identifying the following?
A physical change in a substance.
State why addition of sodium chloride to water is considered a physical change, while addition of dilute sulphuric acid to zinc is considered a chemical change.
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic 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.
Match the examples of changes in List I with the correct type of change in List II.
| List I | List II |
| 1. Burning of paper | A: Physical change |
| 2. The ringing of an electric bell | B: Chemical change |
| 3. Curdling of milk | |
| 4. Electric light is switched on | |
| 5. Melting of butter |
