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प्रश्न
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
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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.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Dissolving common salt in water.
Tick the most appropriate answer
2. Melting of ice is a
- reversible change
- irreversible change
- chemical change
- none of these
State the various conditions that favour the process of evaporation.
Make a list of different types of changes with example.
Classify the following changes as physical or chemical:-boiling
Which of the following are physical changes and which are chemical changes ?
Freezing of water
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.
Desirable and undesirable change.
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective 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.
______ is the substance that is dissolved in a solvent.
