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प्रश्न
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
विकल्प
physical
chemical
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उत्तर
A change in which matter undergoes a change but the total mass of the substance is unaltered is a physical change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Boiling of water to form steam.
Classify the following as chemical or physical change:
Dissolving common salt in water.
A physical change is temporary. Explain.
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
Is burning a physical change or a chemical change? Why?
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
- Digestion of food
- Melting of ice
Fill in the blank with the appropriate word of the statement given below:
If a change is permanent and irreversible it is considered a _________ change.
Digestion of food is a physical change.
Give two examples for the following case:
Physical changes which are reversible
