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
Explain the following giving an example.
Pure substance
Tick the most appropriate answer.
Physical changes are
What are man-made changes ?
Classify the following as a physical or a chemical change.
Melting of wax
Read the paragraph and note down the various types of changes it mentions.
It was nearing six o'clock in the evening. The sun was setting. A breeze was blowing. Leaves on the tree were shaking. Sahil was sitting in the courtyard, rolling balls of wet soil, and shaping them into various toys. Then he felt hungry and went into the house. Mother made a dough from wheat flour and fried purees. While eating hot purees, his attention was drawn outside the window. It had started raining. There was lightning, too. Sahil was enjoying his dinner in the dim light.
Select the chemical changes from the following list of changes
Boiling of milk.
Select the correct answer from the choice given below to complete the sentence
The matter is added or removed during a ____________ change.
A physical change is generally____________.
The change of state of a substance from solid to liquid and liquid to gas is ______.
Explain the characteristics of physical change with examples.
