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प्रश्न
Distinguish between the following.
Physical change and chemical change
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
Classify the following changes as physical or chemical: curdling of milk
Define physical change. Give two examples for the above changes.
State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
Match the columns.
| Column A | Column B |
| 1. a change which cannot be easily reversed | a. man-made change |
| 2 a change that repeats itself at regular intervals | b. chemical chang |
| 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 formed | e. irreversible change |
| f . slow change |
The rusting of an iron object is called :
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
State the observations seen, when milk in a dish is kept aside for a few hours or more. Is the change which occurs – a physical change or a chemical change. Give reasons.
Gas exists in three states as solid, liquid, and gas.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
