Help on 1-3 practice problems

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.

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.