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प्रश्न
State which of the following pertain to – chemical changes.
- Substance retains its identity.
- The change is permanent.
- No new substance is formed.
- Is easily reversible.
- Produces one or more new substances by a change in its composition.
- The change is temporary.
- The composition and properties of the original substance are not altered.
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उत्तर
The following points pertain to chemical changes:
b. The change is permanent.
e. Produces one or more new substances by change in its composition.
The remaining points pertain to physical changes.
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संबंधित प्रश्न
Fill in the blank.
A new substance is formed in a ............... change.
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
Write true or false
Earthquake is a desirable change.
Write true or false
Burning of sugar is a temporary change.
What is a physical change ? Give two examples of physical changes.
State what is meant by the term – interconversion of matter. Is interconversion of matter a physical change or a chemical change.
Give the reason why the following is considered as chemical changes.
A bright light is seen evolved when a strip of magnesium is heated.
Filling up a balloon with hot air is a _______ change.
Distinguish physical and chemical changes.
Which of the following is a physical change?
