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प्रश्न
True or false
Is melting of ice a reversible change?
पर्याय
True
False
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उत्तर
True
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संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Cutting a log of wood into pieces is a chemical change.
Fill in the blank.
Heat is .................... by a gas during the process of condensation.
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
Classify the following changes as physical or chemical:- melting of a solid (wax)
Tick the most appropriate answer.
Physical changes are
A physical change is temporary. Explain.
Classify the following as physical or chemical change :
Growth of a plant
Differentiate between a physical change and a chemical change with reference to – Formation of products.
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
State the conclusions which can be drawn, to represent photosynthesis as a physical or a chemical change.
Sublimation of Iodine is a ______.
