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प्रश्न
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
विकल्प
physical change that can be reversed.
chemical change that can be reversed.
physical change that cannot be reversed.
chemical change that cannot be reversed.
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उत्तर
physical change that can be reversed.
Explanation:
Mixing of sugar in water is a physical change and crystals of sugar can be separated from a supersaturated solution hence it is a reversible change.
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संबंधित प्रश्न
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 3. A change that is made by humans | c. physical change |
|
4. A change in which the original substance cannot be obtained |
d. periodic change |
| 5. A change where no new substance is formade | e. irreversible change |
| f. slow change |
Define physical change. Give two examples for the above changes.
Which of the following are physical changes and which are chemical changes ?
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
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.
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
Ammonium chloride is also a sublimable solid. Give a reason why the sublimation of ammonium chloride involves a physical and a chemical change.
Digestion of food is a physical change.
Distinguish physical and chemical changes.
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
