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प्रश्न
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
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उत्तर
Yes, I can. It is a physical (reversible) change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Burning of paper and wood
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 3. A change that is made by humans | c. physical change |
|
4. A change in which the original substance cannot be obtained |
d. periodic change |
| 5. A change where no new substance is formade | e. irreversible change |
| f. slow change |
Photosynthesis cannot take place at night.
What do you observe when :
lighted match stick is brought near the mouth of the test tube containing hydrogen gas.
Write true or false
Rusting of iron is a chemical change.
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Give two examples of periodic changes.
Given reason:
Cutting of a cloth piece is a physical change, though it cannot be reversed.
Select the correct answer from the choice given below to complete the sentence
The energy required for completion of a physical change is ______________ when the change is reversed.
In a solution of salt in water, water is the solute
