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प्रश्न
Fill in the blank.
When a candle burns, wax melts. Melting of wax is a ________ change.
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उत्तर
When a candle burns, wax melts. Melting of wax is a physical change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Burning of paper and wood
Photosynthesis cannot take place at night.
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
A burning candle shows both physical and chemical changes. Explain ?
Fill in the blank.
Growing of a seedling into a plant is _______ change.
State whether the following is physical or chemical changes.
burning of sugar —
Write true or false
Burning of sugar is a temporary change.
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
Distinguish physical and chemical changes.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
