Single replacement reactions must contain as reactants

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.

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form