1. The problem statement, all variables and given/known data I am having trouble trying to find out if things react with each other or not. I don't really know how to read the reactivity series well 2. Relevant equations Question 1: a student was given a beaker of an unknown ionic solution to identify. she conducted the following tests: 1. add br2 (aq): mixture turns red-brown colour 2. add Al(s): no observed change to solution or metal the unknown ionic solution could be: NaI (aq), AgCl, ZnI2 or CuBr2 Question 2: when chlorine water is added to a sample of colourless ionic solution, the solution changed to a straw brown colour. The unknown solution is most likely to be: KI(aq) or KBr (aq) or Br2 (aq) or F2(aq) 3. The attempt at a solution For question 1,I know that aluminium usually likes to give away electrons so the answer is likely to be NaI? because Na is a stronger reducing agent than Al I think. For question 2 I can eliminate Br2 and F2 since they are not ionic but I am stumped on the other two possible answers.