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प्रश्न
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
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उत्तर
chemical change,
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संबंधित प्रश्न
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 ?
Ice kept in a beaker, slowly melts and turns into water. The water in the beaker on solidification is freezing turns back to ice. Give four reasons why the change from ice to water and water back to ice is considered a physical change.
Name the following:
The final product of the physical change involved during the ‘melting of a piece of wax’.
Select the correct answer from the choice given below to complete the sentence
The dissolution of lead nitrate in water is deemed as a _________ change.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
______ is the substance that is dissolved in a solvent.
Classify the following as physical or chemical properties
Metallic sodium is soft enough to be cut with a knife.
Iron pipes coated with zinc do not get rusted easily.
