What would happen if mixed aqueous solutions of ammonium carbonate and sodium hydroxide?

Is pain reliever a prescription drug?

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.

Which of the following pairs of elements belong to the same groupa. h and he b. li and bec. c and pb d. ga and ge