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Matter In Our Surroundings
State the law of conservation of energy. Hence describe the relationship between work and energy.
The law of conservation of energy states that energy can neither be created nor destroyed.
It can only be converted from one form to another.
Work and energy are correlated. Whenever work is done, the object that does work loses energy and the object on which work is done, gains some energy.
For example, when we kick a ball, we lose some energy and the ball gains an equal amount of energy. The energy gained by the ball makes it to move.
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For any substance, why does the temperature remain constant during the change of state ?
Suggest a method to liquify atmospheric gases.
Convert the following temperatures to Kelvin scale.
35°C
Give reason for the following observations.
Naphthalene balls disappear with time without leaving any solid.
Give reason for the following observations.
We can get the smell of perfume sitting several metres away.
What is the physical state of water at
a) 25°C
b)00C
c)1000C
What is the physical state of water at
0°C
What is the physical state of water at
100°C
Give two reasons to justify
Water at room temperature is a liquid.
Give two reasons to justify
An iron almirah is a solid at room temperature.
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