6. How would the freezing and boiling points of distilled water and seawater com

Question

6. How would the freezing and boiling points of distilled water and seawater compare? a. Both the freezing and boiling points of seawater would be lower. b. Both the freezing and boiling points of seawater would be higher. c. The seawater freezing point would be lower and the seawater boiling point higher. d. The seawater freezing point would be higher and the seawater boiling point lower. Explain your answer 7. Ethylene glycol is the active ingredient in most commercial automobile antifreeze. Why wouldn't sodium chloride be used in a similar way? a. Sodium chloride solute does not lower the freezing point of water b. Sodium chloride does not dissolve in water. c. Sodium chloride lowers the freezing point of water but has other undesirable characteristics. d. Sodium chloride is a solid while ethylene glycol is a liquid. Explain your answer

Explanation / Answer

Q6. Option C is the answer.

Reason: Due to prescence of any impurity, there will be change in physical properties of any liquid. Same is the case with water. In sea water, there is prescence of large number of salts which cause dip in freezing point and also result into increase in boiling point.

This is because with presence of impurity the number of water molecules at the surface decrease that cause less evaporation thus increase in boiling point

Sameway due to presence of impurity, it hinders the freezing process and thus lowering of melting point

q7 option c

reasons ;

If you use NaCl as anti freeze it will corrode your engine since Na has high corrosive power. Moreover, being salt it will deposit at the bottom of the chamber and will not be able to work as anti freeze

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