This is a test please help

If you want to create an electrical current, which situation would produce a solution capable of this

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

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.