In a lab experiment a mixture of salt, sand and water is given to students. The students separate out the sand by filtration. Then, the salt is separated from the water by distillation. Explain why the water, salt or sand cannot be broken down further.

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.