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How does the temperature of ice decrease and yet still melt?

Sunday Nov 8,2009 05:34 AM
By diddy
In Others

When you add salt to ice, the actual temperature of the ice decreases, it becomes colder. (This is why you add salt to ice when making ice cream. )
How in the world do you explain to students that the ice is getting colder and yet it’s melting?
Also, how do you explain this in terms of an exothermic and endothermic reaction.

Exothermic And Endothermic Reaction, Ice Cream, Temperature

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One Comment

Lisa says:

November 8, 2009 at 5:34 am

When you add salt to ice, you are creating salt water. The Na and Cl act to weaken the bond between the water molecules. In order for the salt water to freeze, you must remove more thermal energy in order for the bond to be reestablished. As a result, salt water has a lower freezing point than fresh water.