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प्रश्न
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?
उत्तर
Yes, rust is different from iron. It is a brown powder of iron oxide.
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संबंधित प्रश्न
Fill in the blank.
An earthquake is a .................. change.
Write true or false
Rusting of iron is a chemical change.
Write true or false
Earthquake is a desirable change.
Write true or false
Burning of sugar is a temporary change.
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.
Slow and fast change.
Select the correct answer from the choice given below to complete the sentence
A change in which a substance retains its identity is a
______ change.
Match the following
| Sr. No. | A | B | C |
| 1. | Melting | Change of state from liquid to solid | Ticking of clock |
| 2. | Condensation | Change of state from liquid to gas | Formation of ice cube |
| 3. | Evaporation | Change of state from solid to liquid | Collecting flowers |
| 4. | Freezing | Change of state from gas to liquid | Ice cube to water |
| 5. | Periodic change | Occurs at irregular time intervals | Water to steam |
| 6. | Non-periodic change | Occurs at regular time intervals | Steam to water drops |
Water is the universal solvent. Why?
Give two examples for each of the following cases:
Physical changes which are not reversible.
Explain the characteristics of physical change with examples.
