Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions Fe^2+, Ni^4+, Cl^-, S^2-

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.