Chapter 01 Matter in Our Surroundings Questions-03
Questions
1. Convert the following temperature to celsius scale:
a. $300 K$
b. $573 K$
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Answer
By the use of given formula, we can convert the Kelvin temperature to Celsius.
$TK-273=t^{\circ} C$
(a) $300 K-273=27^{\circ} C$
(b) $573 K-273=300^{\circ} C$
2. What is the physical state of water at:
a. $250^{\circ} C$
b. $100^{\circ} C$ ?
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Answer
As the boiling point of water is $100^{\circ} C$ so
(a) at $250^{\circ} C$, the state of water will be steam or water vapour, i.e., gaseous state.
(b) at $100^{\circ} C$, there will be a transition of liquid state into the gaseous state. So, at this temperature, the state is/may be liquid as well as gaseous.
3. For any substance, why does the temperature remain constant during the change of state?
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Answer
During the change of state of a substance, the temperature remains constant. This can be understood with the help of an example. When a solid is heated to its melting point, the temperature first rises and becomes constant when reaches its melting point. Now, on further heating, the heat energy provided to the substance helps to break the attraction force between the solid molecules. This heat is called latent heat. That is why, the temperature does not rise.
4. Suggest a method to liquefy atmospheric gases.
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Answer
By applying pressure and reducing the temperature, atmospheric gases can be liquefied
