1) Of the compounds MgF2, Mg(OH)2 , and HF, which is an acid, which is a base, and which is a salt? Use definitions from Lesson13 to defend your choices. For the acid and base, are they strong or weak? Explain how you know and what this means. (Lesson 13)

2) When silver tarnishes, silver metal reacts with sulfur compounds to form a gray deposit of Ag2S. If Ag reacts with S to form this compound, identify which element is being oxidized and which is being reduced. Explain how you know that this is true. Make sure to describe which atoms are gaining and losing electrons and explain why this happens. (Lesson 14)