First we need to understand more about stops it from re-freezing. It does this by getting in the way of the hydrogen bonds that help to make ice form. Salt is made of sodium and chloride. When it dissolves in water, it breaks apart. The sodium (which has a positive charge) is attracted to the oxygen part of the water molecule and the chloride (which has a negative charge) is attracted to the hydrogen part of the water molecule. This prevents hydrogen bonding so it prevents re-freezing. Since more water is melting and less is re-freezing, more heat is being absorbed from the surroundings and less is being released into the surroundings. Therefore, the surroundings get colder. Experiments have shown that adding salt to ice water can make