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Answers
Answer:
1)This is because it undergoes sublimation.When a thing undergoes sublimation it get converted into vapour directly from solid withing passing through the liquide state.
2)Because it absorbs energy from its surroundings.And in doing so we feel the ice to be cool
3)Latent heat of fusion is the point where all the energy suplied to the body is used to change the state of that object from solid to liquide.It is 0°C or 273K.It is also know as the melting point.
4)Latent heat of Vaporisqtion is when all the heat energy suplied to that body is used to convert the state of that matter from liquid to gas.It is usually at 100°C or 373K.It is also know as the boiling point.
5)Evaporation causes cooling.This is the reason we sprincle water on our face during hot summer season.When the water is sprincled the molecules of water gain kinetic energy from the surroundings to be able to evaporate.This process leaves the surface cool.
6)The table is a solid as it cannot change its shape and volume.Also the intermolecular forces of attraction are very high and the intermolecular spaces are very less.This restricts it from changing its shape.
7) Salt,Water,Oxygen.
Salt is a solid.
Water is a liquid.
Oxygen is a gas.
8)Matter has mass and occupies space.
9)This is because the hot substances has more kinetic energy and it travels faster than the cool molecules.
HOPE IT HELPS