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प्रश्न
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
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उत्तर
Chemical change occurs as a result of rearrangement of atoms between two substances.
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संबंधित प्रश्न
State whether the following is physical or chemical changes.
respiration in living beings —
The rusting of an iron object is called :
Fill in the blank.
The process of a liquid changing into a solid is called ________
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Periodic and non-periodic change
Match the examples of changes in List I with the correct.
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | |
| 4. Tarnishing of copper | |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. |
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
Give a reason why rusting of iron is a chemical change but, the magnetization of iron is a physical change.
Select the chemical changes from the following list of changes
Glowing of an electric bulb.
Water is known as a universal solvent. Why?
What kind of change is shown by tearing of paper?
