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redox y electrochem
| Question | Answer |
|---|---|
| What is an oxidation number? | A number representing electrons lost, gained, or shared by an atom |
| What oxidation number does an element by itself have? | 0 |
| What is the oxidation number of a monatomic ion? | Equal to its charge |
| What is the sum of oxidation numbers in a neutral compound? | 0 |
| What is the sum of oxidation numbers in a polyatomic ion? | Equal to the ion's charge |
| What oxidation number do Group 1 metals have in compounds? | +1 |
| What oxidation number do Group 2 metals have in compounds? | +2 |
| What oxidation number does fluorine have in compounds? | -1 |
| What oxidation number does hydrogen usually have in compounds? | +1 |
| What oxidation number does hydrogen have when bonded to a metal? | -1 |
| What oxidation number does oxygen usually have in compounds? | -2 |
| What oxidation number does oxygen have in a peroxide? | -1 |
| What oxidation number does oxygen have when bonded to fluorine? | +2 |
| When does a redox reaction occur? | When electrons are transferred |
| How can you recognize a redox reaction? | Oxidation numbers change |
| Why do oxidation numbers change in redox reactions? | Electrons are transferred |
| Are single replacement reactions usually redox reactions? | Yes |
| Are double replacement reactions usually redox reactions? | No |
| What is oxidation? | Loss of electrons |
| What mnemonic helps remember oxidation? | LEO |
| What happens to oxidation number during oxidation? | It increases |
| What is the reducing agent? | The substance that is oxidized |
| What is reduction? | Gain of electrons |
| What mnemonic helps remember reduction? | GER |
| What happens to oxidation number during reduction? | It decreases |
| What is the oxidizing agent? | The substance that is reduced |
| Can oxidation occur without reduction? | No |
| Can reduction occur without oxidation? | No |
| What occurs simultaneously in a redox reaction? | Oxidation and reduction |
| What do oxidation-reduction half reactions show? | Electrons lost or gained |
| What two conservation laws must half reactions obey? | Conservation of mass and conservation of charge |
| In a redox reaction, how do electrons lost compare to electrons gained? | They are equal |
| What is an electrochemical cell? | A device that uses redox reactions to produce or use electricity |
| What is a voltaic cell? | A cell that converts chemical energy into electrical energy |
| Is a voltaic cell spontaneous or nonspontaneous? | Spontaneous |
| What is an electrolytic cell? | A cell that uses electrical energy to cause chemical change |
| Is an electrolytic cell spontaneous or nonspontaneous? | Nonspontaneous |
| In a voltaic cell, which metal is oxidized? | The more reactive metal |
| In a voltaic cell, where does oxidation occur? | At the anode |
| In a voltaic cell, where does reduction occur? | At the cathode |
| In a voltaic cell, what is the charge of the anode? | Negative |
| In a voltaic cell, what is the charge of the cathode? | Positive |
| In a voltaic cell, which metal is reduced? | The less reactive metal |
| What table is used to determine the more reactive metal? | Table J |
| In an electrolytic cell, where does oxidation occur? | At the anode |
| In an electrolytic cell, where does reduction occur? | At the cathode |
| In an electrolytic cell, what terminal is the anode connected to? | Positive terminal |
| In an electrolytic cell, what terminal is the cathode connected to? | Negative terminal |
| Does oxidation always occur at the anode? | Yes |
| Does reduction always occur at the cathode? | Yes |
| What mnemonic helps remember oxidation occurs at the anode? | Anne the Ox |
| What mnemonic helps remember reduction occurs at the cathode? | The Red Cat |
| In all electrochemical cells, which way do electrons flow? | From anode to cathode |
| What happens to the mass of the anode during oxidation? | It decreases |
| Why does the anode lose mass? | Atoms become ions and leave the electrode |
| What happens to the mass of the cathode during reduction? | It increases |
| Why does the cathode gain mass? | Ions become atoms and plate onto the electrode |
| What is the charge of the anode in a voltaic cell? | Negative |
| What is the charge of the cathode in a voltaic cell? | Positive |
| What is the charge of the anode in an electrolytic cell? | Positive |
| What is the charge of the cathode in an electrolytic cell? | Negative |
| What happens to oxidation number when electrons are lost? | It increases |
| What happens to oxidation number when electrons are gained? | It decreases |
| What is the relationship between oxidation and reduction? | One cannot occur without the other |
| What is the definition of LEO? | Loss of Electrons is Oxidation |
| What is the definition of GER? | Gain of Electrons is Reduction |
| Which agent causes oxidation? | Oxidizing agent |
| Which agent causes reduction? | Reducing agent |
| Which agent gains electrons? | Oxidizing agent |
| Which agent loses electrons? | Reducing agent |
| Which agent is reduced? | Oxidizing agent |
| Which agent is oxidized? | Reducing agent |
| What is the most important electron flow rule in electrochemical cells? | Electrons flow from anode to cathode |
| What is the most important oxidation-reduction rule? | Oxidation number increases during oxidation and decreases during reduction |
| What Regents shortcut identifies many redox reactions? | An element alone on one side and in a compound on the other |
| What Regents shortcut identifies most non-redox reactions? | Double replacement reactions |
Created by:
markoii