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प्रश्न
Name two reversible changes.
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उत्तर
Melting of ice.
Dissolving of salt in water.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Cutting of trees
State whether the following is physical or chemical changes.
burning of sugar —
Write true or false
Rusting of iron is a chemical change.
Write true or false
A natural change can also be a desirable 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.
Two chemical substances X and Y combine together to form a product P which contains both X and Y X + Y P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct ?
- P is a compound
- X and Y are compounds
- X and Y are elements
- P has a fixed composition
Classify the following as a physical or a chemical change.
Butter getting rancid
Select the chemical changes from the following list of changes
Breaking of glass
Classify the following as physical or chemical properties
Metallic sodium is soft enough to be cut with a knife.
Give an example of a physical change in which the color of the substance changes.
