Which property of fossil fuel make them an important resource for life on earth

There are main groups in the modern periodic table of elements

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

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.