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प्रश्न
Give two examples for the following case:
Physical changes which are not reversible
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उत्तर
- Cutting of paper
- Breaking of glass
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संबंधित प्रश्न
How do you say that the process of digestion is a chemical change ?
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
State whether the following is physical or chemical changes.
mixing oil with water —
True or false
In a physical change no net energy change is involved.
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.
Fill in the blank with the appropriate word of the statement given below:
If a change is permanent and irreversible it is considered a _________ change.
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
When ice melts to form water, change occurs in its
Distinguish physical and chemical changes.
Natural changes which take place in nature on their own, are beyond the control of human being.
