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प्रश्न
State which of the following 1 to 5 pertain to – A: Physical Change B: Chemical change :
- Sublimation.
- Fermentation.
- Liquefaction or condensation.
- Magnetization.
- Respiration.
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उत्तर
- Sublimation – A: Physical Change
- Fermentation – B: Chemical change
- Liquefaction or condensation – A: Physical Change
- Magnetization – A: Physical Change
- Respiration – B: Chemical change
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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
Fill in the blank.
Heat is .................... by a gas during the process of condensation.
Dissolving salt in water is a reversible change.
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
Give the main differences between physical changes and chemical changes.
Classify the following as a physical or a chemical change.
Burning of coal
Fill in the blank.
A change, which alters the composition of a substances, is known as a___________ change.
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
Gas exists in three states as solid, liquid, and gas.
Cutting a log of wood into pieces is a chemical change.
