Show an image or animation or description of what is happening when water dissolves NaCl.
The water molecules slowly take apart the Na and Cl from the NaCl.
http://www.northland.cc.mn.us/biology/biology1111/animations/dissolve.html-- really liked this one, describes it while showing an animation.
http://www.chemistry.wustl.edu/~edudev/LabTutorials/Water/PublicWaterSupply/dissolving_movie.html
Why is the freezing point lowered when salt is added to water?
When salt dissolves in water, the Na and the Cl ions leave the salt crystal and mix with the water molecules. Water molecules then form crystals when freezing. The Na and the Cl ions then begin to get in the way of the H2O molecules; which makes it harder for them to become re-arranged into crystals. This then causes the salt water to remain in a liquid state for longer as temperatures reduce.
Why is the freezing point lowered when salt is added to water?
When salt dissolves in water, the Na and the Cl ions leave the salt crystal and mix with the water molecules. Water molecules then form crystals when freezing. The Na and the Cl ions then begin to get in the way of the H2O molecules; which makes it harder for them to become re-arranged into crystals. This then causes the salt water to remain in a liquid state for longer as temperatures reduce.
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