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प्रश्न
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.
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उत्तर
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Dissolving common salt in water.
How do you say that the process of digestion is a chemical change ?
Which of the following are physical changes and which are chemical changes ?
Freezing of water
Classify the following as a physical or a chemical change.
Melting of wax
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
Fill in the blank with the correct word of the statement given below:
Sublimation of iodine is an example of _________ change.
Potassium chloride is added to water and stirred. A salt solution is obtained, which is then boiled, leaving behind a residue.
- Is the above change physical or chemical?
- Name the residue which remains behind after the salt solution is boiled.
- Is the change reversible or not reversible?
- Are the composition and properties of the original substance altered?
- Give a reason why the above experimentation would not be possible if calcium carbonate was taken in place of potassium chloride.
Sublimation of Iodine is a ______.
Gas exists in three states as solid, liquid, and gas.
Explain the characteristics of physical change with examples.
