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प्रश्न
State four differences between physical and chemical changes.
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उत्तर
| Physical change | Chemical change |
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संबंधित प्रश्न
State whether the following is physical or chemical changes.
glowing of a bulb -
Photosynthesis cannot take place at night.
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.
Which of the following are physical changes ?
- melting of iron metal
- rusting of iron metal
- bending of an iron rod
- drawing a wire of iron metal
Classify the following as a physical or a chemical change.
Burning of coal
Classify the Following as a Physical Or a Chemical change.
Glowing of an Electric Bulb
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
Name the following.
The product obtained during a physical change when water converts from a liquid into a solid.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think rust is different from iron?
Give an example of a physical change in which the color of the substance changes.
