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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
What are reversible and irreversible changes ? Give one example for each.
State whether the following is physical or chemical changes.
burning of sugar —
Write true or false
Earthquake is a desirable change.
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
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.
Stretching gold coin into a ring is a ______ change.
Physical Change: Boiling::Chemical Change: ______.
Gas exists in three states as solid, liquid, and gas.
Keeping a stone in sunlight for few hours is ______.
Mention a few physical properties of a substance.
