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प्रश्न
Filling up a balloon with hot air is a _______ change.
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उत्तर
Filling up a balloon with hot air is a
physical change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Explain the following giving an example.
Pure substance
Chemical changes are accompanied by changes in energy.
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
State what is meant by the term – interconversion of matter. Is interconversion of matter a physical change or a chemical change.
Ice kept in a beaker, slowly melts and turns into water. The water in the beaker on solidification is freezing turns back to ice. Give four reasons why the change from ice to water and water back to ice is considered a physical change.
Select the chemical changes from the following list of changes
Breaking of glass
Give the reason why the following is considered as chemical changes.
A bright light is seen evolved when a strip of magnesium is heated.
Name the following.
A form of energy required for a chemical change.
Which of the following is not a physical change?
