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प्रश्न
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
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उत्तर
- Boiling of water is a physical change:
On boiling, water is converted into steam. If we cover the beaker with a lid, steam condenses back to water. So, boiling, of water is a physical change since only the physical state of water changes.
- Boiling of egg is chemical change:
When egg is boiled, chemical nature of the egg changes. The properties of a boiled egg are totally different from the raw egg. Hence, boiling of an egg is a chemical change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Dissolving common salt in water.
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 |
Write short answer.
What are man-made changes ?
State whether the following is physical or chemical changes.
Slaking of lime —
Write true or false
Burning of sugar is a temporary change.
Classify the following as a physical or a chemical change.
Melting of wax
Give the reason why the following is considered as chemical changes.
A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.
Name the following.
The product obtained during a physical change when water converts from a liquid into a solid.
What type of energy changes is associated when ice melts?
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
