Differentiate between desirable and undesirable changes
Important Questions on Physical and Chemical Changes
Classify the following change into exothermic and endothermic and physical and chemical changes.
2. Freezing of water
Classify the following change into exothermic and endothermic and physical and chemical changes.
3. Melting of ice
Classify the following change into exothermic and endothermic and physical and chemical changes.
4. Evaporation of water
Classify the following change into exothermic and endothermic and physical and chemical changes.
5. Adding water into ammonium chloride
Complete the following cross word puzzle.
Across:
8. Earthquake is a _____.
Down:
1. A change which involves absorption of heat from the surroundings.
2. A change in which a new substance is formed.
3. A change in which heat is evolved.
4. Change in physical properties of a substance.
5. A change that can be reversed.
6. Metal used in galvanisation method.
7. A change which occurs quickly.
The three objects given below were kept in the open area for a few days and some changes were observed.
What type of changes will be observed in the above given substances? Classify the changes observed into physical and chemical changes.
