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Salt helps to melt ice because itA. dissolves in water to form an acidB. chemically destroys the water moleculesC. lowers the temperature at which water freezesD. is attracted to concrete sidewalks below the ice

Question

Salt helps to melt ice because itA. dissolves in water to form an acidB. chemically destroys the water moleculesC. lowers the temperature at which water freezesD. is attracted to concrete sidewalks below the ice

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Solution

The correct answer is C. Salt helps to melt ice because it lowers the temperature at which water freezes.

Here's a step-by-step explanation:

  1. When salt is spread on ice, it starts to dissolve in the water present on the ice's surface. This process is endothermic, meaning it absorbs heat from the surroundings.

  2. The heat absorbed during this process helps to melt the ice around the salt grain.

  3. The dissolved salt particles interfere with the water molecules' ability to form solid ice crystals. This effectively lowers the freezing point of the water.

  4. As a result, more ice melts than would naturally at the same temperature. This is why salt is often used to de-ice roads and sidewalks in winter.

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