Answer:
The water at the top of a waterfall has __potential___ energy.
By adding salt to the ice-creams, it lowers its melting point and allows the ice cream to freeze cohesively. When salt is added to ice, the equilibrium is reached and kept at lower temperature.
When water reaches 32°F ( 0°C ), It turns into ice. At this temperature, The water molecules and ice molecules are interacting. If the temperature increases, more water become ice.
When the ionic compound salt is added, it lowers the freezing point of water. This concept is called "Freezing point depression". Freezing point depression is a drop in the minimum temperature at which substance freezes, caused when a smaller amount of another, non-volatile substance.
When salt added to the ice, the freezing point reduces from zero to negative value of degree Celsius -9°C( 15°F ), The temperature of salt is too cold for the salt to dissolve into the ice.
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Answer:
Water normally freezes at 0°C (32°F). Salt lowers the freezing temperature. (That is, it can remain a liquid at much lower temperatures.)
When sprinkled on ice, the salt lowers the freezing temperature of the water which effectively melts the ice when the salt dissolves into it. There is a limit to how low it can reduce the temperature, though. If the temperature drops below -9°C (15°F), it's too cold for the salt to dissolve into the ice.
When making ice cream, the salt lowers the temperature of the ice and water sufficiently enough to freeze the cream.
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