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Question
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.
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Solution
If a change is permanent and irreversible it is considered a chemical change.
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RELATED QUESTIONS
Classify the following as chemical or physical change:
Cutting of trees
State the differences between a physical change and a chemical change.
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When a candle burns, wax melts. Melting of wax is a ________ change.
State whether the following is physical or chemical changes.
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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.
Given reason:
Burning of paper is a chemical change.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
The change of state of a substance from solid to liquid and liquid to gas is ______.
Give an example of a physical change in which the color of the substance changes.
