Why do heated molecules rise? a Because they are less dense than the molecules around them b Because they are moving slower than the other molecules c Because they are denser than the molecules around them

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.

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy