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प्रश्न
Give an example of desirable change which can also be undesirable.
उत्तर
Using a car to cover a long distance is a desirable change but car emissions can lead to air pollution which is undesirable.
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संबंधित प्रश्न
What is the physical state of water at 100°C.
For any substance, why does the temperature remain constant during the change of state?
Tick the most appropriate answer.
Melting of ice is a
Tick the most appropriate answer.
Chemical changes involve
Why is solid carbon dioxide known as dry ice ?
Define the following term Boiling.
Draw a labelled diagram of the experimental set-up to study the latent heat of fusion of ice.
The boiling point of ethane is – 88°C. This temperature will be equivalent to :
Which of the following energy is absorbed during the change of state of a substance ?
Define the following terms: Liquefaction
Differentiate between: Miscible and immiscible liquids.
Water cycle is an example of interconversion of states of water. Explain
Write whether the following statement is true or false:
All solids, on heating, first change to the liquid and then to the gaseous state always
Name the phenomenon which causes the following changes:
Conversion of water into steam
Explain the term freezing
With the help of a simple diagram how would you show that – solids expand on heating
Why does this happen?
Kerosene left open in a dish disappears.
Matter in any state is composed of small particles – molecules, atoms, or ions. Differentiate the terms above in Italics.
Complete the blank with reference to interconversion of matter on the basis of kinetic theory-with the word ‘increase’, ‘decreases’, ‘gain’, ‘lose’, or ‘overcome’ in following case.
During the melting of solids, the inter-particles space __________.
