Chemistry - Chp 20 - Oxidation Reduction - Study Guide
- 1. Name ______________________________________ Date _______________ Per _____ Oxidation Reduction and Electrochemistry Review Sheet • What is transferred between reactants in Redox reactions • What is Oxidation? • What is Reduction? • How do you know when a chemical reaction is not a redox reaction? • What is the oxidizing agent? • What is the reducing agent? • Know the rules for assigning oxidation numbers 1. The oxidation number of any uncombined element is _____________ 2. The oxidation number of a monoatomic ion ______________________________ 3. The oxidation number of oxygen in compounds is __________ 4. The oxidation number of hydrogen in compounds is _________ 5. The sum of the oxidation numbers of the atoms in the compound must equal ____ 6. The sum of the oxidation number in the formula of a polyatomic ion is equal to its __________________________ • Are metals or nonmetals better oxidizers? Why? • Are metals or nonmetals better oxidizing agents? Why? • Be able to write and identify redox half reactions (Write an example) • Know everything about electrochemical (voltaic) cells. • Cathode (what happens there? Is it positive or negative? • Anode (what happens there? Is it positive or negative? • How do you decide which electrode is the anode and which is the cathode?
- 2. • What is the purpose of the salt bridge? • Which direction do electrons flow through the wire? • Which electrode dissolves away and which one gains atoms and gets heavier? • Know everything about electrolytic cells • Cathode (what happens there? Is it positive or negative? • Anode (what happens there? Is it positive or negative? • How do you decide which electrode is the anode and which is the cathode? • To which electrode do the positive ions in the solution in an electrolytic cell migrate? What about the negative electrodes? • What is the difference between electrochemical (Voltaic) and electrolytic cells?