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
Fill in the blank.
When a candle burns, wax melts. Melting of wax is a ________ change.
State whether the following is physical or chemical changes.
lightning —
Tick the most appropriate answer.
Rising and setting of the sun at a given place is a
Fill in the blank
Heat is ________ by a gas during the process of condensation.
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
Which of the following are physical changes and which are chemical changes ?
Rusting of iron
Is a change of state of matter – a physical or a chemical change. Give reasons.
Select the chemical changes from the following list of changes
Rotting of eggs.
What type of energy changes is associated when ice melts?
Mention a few physical properties of a substance.
