Acertain liquid has a normal freezing point of and a freezing point depression constant . a solution is prepared by dissolving some ammonium chloride () in of . this solution freezes at . calculate the mass of that was dissolved. be sure your answer is rounded to the correct number of significiant digits.

How has the scientific community addressed the safety of chemicals? a. chemicals are repeatedly tested, even those that have existed for a long time. b. existing chemicals are tested if they have never been tested before. c. chemicals are tested if they are suspected to have caused a problem. d. only new chemicals are tested.

__can be defined as which velocity changes

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.