Explain why :
(a) Water is an excellent liquid to use in cooling systems.
(b) A solution is always clear and transparent.
(c) Lakes and rivers do not suddenly freeze in the winters.
(d) The solute cannot be separated from a solution by filtration.
(e) Fused CaCl2 or conc. H2SO4 is used in a desiccator.
(f) Effervescence is seen on opening a bottle of soda water.
Explain why :
(a) Water is an excellent liquid to use in cooling systems.
(b) A solution is always clear and transparent.
(c) Lakes and rivers do not suddenly freeze in the winters.
(d) The solute cannot be separated from a solution by filtration.
(e) Fused CaCl2 or conc. H2SO4 is used in a desiccator.
(f) Effervescence is seen on opening a bottle of soda water.
(a) Water is an excellent liquid to use in cooling systems due to its ability to absorb large quantities of heat i.e. specific heat = 4.2J/g oC, so it is used in the cooling system i.e. as a cooling agent.
(b) A solution is always clear and transparent because in a solution, solid disappeared in water and water has property – transparency. So, the solution is always clean and transparent.
(c) Lakes and rivers do not freeze suddenly in winters due to high specific latent heat of solidification. i.e. the amount of heat released when 1 g of water solidifies to form 1 g of ice at 0oC. It is about 336 J/g or 80 cal/g. Such enormous amount of heat leads to immediate freezing of lakes and rivers in winter. (d) The component that actually dissolves in a solvent is known as solute. So it can be separated from the solution by the filtration process. But the filtration process is applicable only when the solute is insoluble in the solution. So the solute cannot be separated from solution by filtration.
(e) Fused CaCl2 or concentrated H2SO4 is deliquescent in nature absorbs moisture and hence, these are used in desiccators or as a drying agent.
(f) Carbon dioxide is dissolved in soda water under pressure. On opening the bottle, the pressure on the surface of water suddenly decreases, therefore, the solubility of CO2 in water decreases and the gas rapidly bubbles out.
(a) Water is an excellent liquid to use in cooling systems due to its ability to absorb large quantities of heat i.e. specific heat = 4.2J/g oC, so it is used in the cooling system i.e. as a cooling agent.
(b) A solution is always clear and transparent because in a solution, solid disappeared in water and water has property – transparency. So, the solution is always clean and transparent.
(d) The component that actually dissolves in a solvent is known as solute. So it can be separated from the solution by the filtration process. But the filtration process is applicable only when the solute is insoluble in the solution. So the solute cannot be separated from solution by filtration.
(e) Fused CaCl2 or concentrated H2SO4 is deliquescent in nature absorbs moisture and hence, these are used in desiccators or as a drying agent.
(f) Carbon dioxide is dissolved in soda water under pressure. On opening the bottle, the pressure on the surface of water suddenly decreases, therefore, the solubility of CO2 in water decreases and the gas rapidly bubbles out.
