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प्रश्न
Try segregating the things around you as pure substances or mixtures.
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 short answer.
Sublimation is classified as a physical change. Why ?
What do you observe when :
lighted match stick is brought near the mouth of the test tube containing hydrogen gas.
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
Match the columns.
| Column A | Column B |
| 1. a change which cannot be easily reversed | a. man-made change |
| 2 a change that repeats itself at regular intervals | b. chemical chang |
| 3. a change that is made by humans | c. physical change |
| 4. a change in which the original substance cannot be obtained | d. periodic change |
| 5. a change where no new substance is formed | e. irreversible change |
| f . slow change |
Classify the following as physical or chemical change :
Formation of curd from milk
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
Physical Change: Boiling::Chemical Change: ______.
Sublimation of Iodine is a ______.
______ is the Universal Solvent.
