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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
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
State whether the following is physical or chemical changes.
Slaking of lime —
Write true or false
Rusting of iron is a chemical change.
True or false
Change of seasons is a non-periodic change.
Classify the following changes as physical or chemical.
Solve this crossword by using the clues that follow-
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1 . It is the change that takes place in case of swinging pendulum of a clock. –
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change.
Classify the Following as a Physical Or a Chemical change.
Glowing of an Electric Bulb
Fill in the blank.
The process of a liquid changing into a solid is called ________
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
______ is the Universal Solvent.
