Please help me I’m not sure with that

Compare and contrast physical changes with chemical changes.

What is the main reason why some developing countries fear the increase the free trade policies around the world?

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.