what coefficient values will balance the reaction?
mg + o2 ? mgo
a. 1,2,1
b. 1,2,2
c. 2,1,2
d. 1,1,2

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.