Complete the following sentence. at a given temperature, lighter gas molecules leak through a tiny hole faster than heavier gas molecules do because the lighter molecules than the heavier molecules. a. are moving faster b. are smaller in size c. take up less volume d. have greater pressure

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.