Give the possible oxidation states for each element Fr Pb S F a. 0. b. 1. c. -1. 1. 6 m. -6 d. 2. and e. -2 f. 3 g. -3 h. 4 i. -4 j. 5 , and k. -5

2. Assign an oxidation state to each atom in the following compounds: a. H₂O b. K₂O c. MgH₂ ✰✰✰✰✰✰✰✰✰✰✰✰

1. In which compound is there a nitrogen atom with a +4 oxidation state? a. NS b. NaCN c. NO2 d. NO e. NH3

1. Which is statement is INCORRECT? a. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. b. Reduction is a process in which an atom gains an electron and therefore decreases (or reduces its oxidation number). c. Oxidation is a process in which an atom gains an electron and therefore increases its oxidation number. d. An electron-donating species which tends to hand over electrons can be referred to as a reducing agent. 2. What chemical process must always accompany a reduction process? a. oxidation c. reduction b. balancing reaction d. half-reaction