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प्रश्न
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
उत्तर
| Physical change | Chemical change |
| Generally, energy is neither absorbed nor released during the change. | Generally, energy is either absorbed or evolved during change. |
| Example: Melting of ice, melting of the wax. | Example: Change of milk into curd and burning of a candle. |
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Melting of butter in a pan
Write short answer.
What are man-made changes ?
Write true or false
A natural change can also be a desirable change.
State the Differences Between a Physical Change and a Chemical 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.
What is a chemical change ? Give two examples of chemical changes.
Name the following:
The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.
State whether the following statements are true or false:
Anaerobic bacteria digest animal waste and produce biogas.
Keeping a stone in sunlight for few hours is ______.
Cutting a log of wood into pieces is a chemical change.
