7
Question
Sea water does not freeze easily when compared to pure water. Why? [2 MARKS]
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Solution
Explanation: 2 Marks
Ice is a crystal, an almost perfect array of pure water molecules with almost no salt in it. To make that out of pure water requires reducing and limiting the ways the water molecules move around. To make that out of salt water requires both limiting the ways the water molecules move around and limiting the ways the salt can move around. This requires removal of a greater amount of kinetic energy from the salt solution. This is the reason why sea water does not freeze at 0o celcius, instead freezes at −21o celcius.
Ice is a crystal, an almost perfect array of pure water molecules with almost no salt in it. To make that out of pure water requires reducing and limiting the ways the water molecules move around. To make that out of salt water requires both limiting the ways the water molecules move around and limiting the ways the salt can move around. This requires removal of a greater amount of kinetic energy from the salt solution. This is the reason why sea water does not freeze at 0o celcius, instead freezes at −21o celcius.
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