Advertisements
Advertisements
प्रश्न
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
Advertisements
उत्तर
| Physical change | Chemical change |
| Generally, energy is neither absorbed nor released during the change. | Generally, energy is either absorbed or evolved during change. |
| Example: Melting of ice, melting of the wax. | Example: Change of milk into curd and burning of a candle. |
APPEARS IN
संबंधित प्रश्न
Write true or false
A natural change can also be a desirable change.
Write true or false
Decomposition of leaves is a fast change.
Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
- Digestion of food
- Melting of ice
Define a chemical change. Give two examples of the above changes.
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Natural and man-made change.
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.
Select the chemical changes from the following list of changes
The occurrence of lightning.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
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.
