Question

Comment on the following statements.
a) Ice is solid at 0°C while water is liquid at room temperature.
b) Sugar crystals dissolve faster in hot water than in cold water.
c) Sponge though compressible is a solid.
d) Evaporation causes cooling.

Answer 1

Answer:Evaporation produces cooling as the particles at the surface of the liquid gain energy from the

surroundings and change into vapour, thereby producing a cooling effect.

Air around us cannot hold more than a definite amount of water vapour at a given temperature which is known as humidity. So, if the air is already rich in water vapour, it will not take up more water; therefore, rate of evaporation of water will decrease.

A sponge has minute holes in which air is trapped. Also the material is not rigid. When we press it, the air is expelled out and we are able to compress it. But it is a solid because it has definite shape and volume and does not change its shape unless compressed.

Ice is solid at 0°C because it has a definite volume and definite shape due to strong intermolecular forces. Water is liquid at room temperature because it has definite volume and no definite shape due to weak intermolecular forces of attraction.

Sugar crystals dissolve faster in hot water than cold water because hot water molecules have more kinetic energy. Due to this, they strike faster on the particles of sugar than cold water molecules. As a result, hot water will dissolve them faster than cold water

Answer 2

Question- Ice is solid at 0°C while water is liquid at room temperature

• Answer - Ice state can change from a solid to a liquid or gas by changing its temperature. Water is a liquid at room temperature or at normal temperature, but becomes a solid (called ice) when it's cooled down or at 0°C .

Question - Sugar crystals dissolve faster in hot water than in cold water.

• Answer- Sugar crystals are big or tiny but in hot water they dissolve faster because hot water has more energy or power than cold water.So ,on heated the molecules gain energy and dissolve faster .

Question -Sponge though compressible is a solid.

• Answer - It has definite volume and shape doesn't change unless compress. Sponge has Pores . So ,in presence of air cavities inside the sponge it can compressible .It has numerous pores or air cavities by which air is trapped and on compressing the sponge it comes out.

Question - Evaporation causes cooling.

• Answer- In summer season or days , when the temperature is rise along with the higher rate of evaporation. So , water gains energy from the air and environment which gets converted to vapour and makes the air cooler.

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