1) Which of the following is evidence for a chemical reaction?
(a) Heating purple iodine crystals produces a purple gas.
(b) Dropping sodium metal into water produces fizzing.
(c) Dissolving a white powder in solution gives white light.
(d) Mixing two colorless solutions gives a yellow solution.
2) Predict which of the following compounds are soluble in water:
(a) cobalt (II) hydroxide, Co(OH)2 ______________
(b) iron (II) sulfate, FeSO4 ____________________
(c) silver chloride, AgCl ______________________
(d) lead (II) acetate, Pb(C2H3O2)2 _____________