Activity 4 - Dissolving

Show an image or animation or description of what is happening when water dissolves NaCl.

Why is the freezing point lowered when salt is added to water?

Water molecules form crystals when freezing.  The salt gets in the way of the water molecules, making it harder for them to become re-arranged into crystals. It then takes longer for the salt water to freeze because the salt is in the way and needs to wait for the temperature to continue to reduce.