What element(s) must be present in a molecule for it to be considered an organic molecule?

As you move from right to left on the periodic table the atomic radius fill in the blank

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.

Which terms are used to identify pure substances