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प्रश्न
Try segregating the things around you as pure substances or mixtures.
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उत्तर
- Pure substance: Distilled water, diamond; graphite, gold, sulphur.
- Mixture: Curd, ice cream, kerosene oil, cooking oil, steel, vulcanised rubber, solder wire (an alloy of lead and tin).
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संबंधित प्रश्न
Write true or false for the statement.
Deforestation is a man-made change
Ripening of fruits is a desirable change.
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
Photosynthesis cannot take place at night.
Give the reason why the following is considered as chemical changes.
An iron nail kept open in the atmosphere rusts.
Name the following.
The product obtained during a physical change when water converts from a liquid into a solid.
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
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 |
What is the difference between dissolution of sugar and burning of sugar ?
Iron pipes coated with zinc do not get rusted easily.
