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प्रश्न
Distinguish between the following.
Physical change and chemical change
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उत्तर
| Physical Change | Chemical Change | |
| 1. | The chemical composition of a substance does not change. | The chemical composition of a substance does not remain the same. |
| 2. | Easily reversible | Not easily reversible |
| 3. | No new substance is formed | New substances are always formed |
| 4. | Melting of ice is an example of physical change. | The burning of paper is an example of chemical change. |
संबंधित प्रश्न
Changes in which only ______ properties of a substance change are called physical changes.
Explain why burning of wood and cutting it into small piece are considered as two different types of changes.
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 |
What role does energy play in initiating a chemical change ?
Fill in the blank
Changes that occur in nature are called ______
Write true or false
Burning of paper and formation of curd are reversible changes.
Photosynthesis cannot take place at night.
Classify the following as physical or chemical change :
Growth of a plant
What is a physical change ? Give two examples of physical changes.
Which of the following is a physical change?
