Advertisements
Advertisements
प्रश्न
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Advertisements
उत्तर
Water undergoes a physical change when it is heated to a temperature of 100°C. At this temperature, the water gets converted to water vapours. This process is called evaporation. Water undergoes a chemical change when it is subjected to electricity. It splits into its constituents, oxygen and hydrogen, by the process of electrolysis.
APPEARS IN
संबंधित प्रश्न
Write true or false for the statement.
Deforestation is a man-made change
State three differences between evaporation and boiling
Fill in the blank
Changes that occur in nature are called ______
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
Select the correct answer from the choice given below to complete the sentence
The energy required for completion of a physical change is ______________ when the change is reversed.
Give the reason why the following is considered as chemical changes.
A bright light is seen evolved when a strip of magnesium is heated.
Name the following.
A form of energy required for a chemical change.
Which of the following is a physical change?
