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21 Cards in this Set
- Front
- Back
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What is an electrochemical cell and the three things needed to create it |
Allows electrons to flow through a wire and create electricity. It needs a wire, redox reaction, porous burner |
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If the substances in a redox reaction are in contact, what type of energy is created |
Heat energy |
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in an evil extra chemical cell, describe the chemical reaction that occurs at the anode and cathode |
Anode- oxidation "away" Cathode- reduction "catches" |
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In an electrochemical cell, what is the flow of electrons called and in what direction do they normally follow |
electric current; flows from anode to cathode |
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In a zinc-carbon dry cell, what makes up the anode and cathode? |
Zinc-carbon Carbon rod- cathode |
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What is another name for a voltaic cell |
Galvanic cell |
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What are four examples of electrochemical cells |
Dry cell, alkaline cell, mercury battery, voltaic cell, fuel cells |
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What is corrosion and three things that will increase it |
Oxidation of metals example water, oxygen, ions |
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What prevents corrosion and how does it work |
Galvanizing; coat the metal with another metal that oxidizes more easily and faster |
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Using reduction potential, how can the oxidizing and reducing substance be determined in a voltaic cell? Which substance will be the cathode and which one will be the anode |
anode - more negative / smaller value; oxidation Cathode - more positive or larger value; reduction |
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How is the E°cell voltage determined |
E°cell=E°cathode-E°anode |
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How do the redox reactions compare in voltaic and electrolytic cells |
Voltaic - spontaneous Electrolytic - not spontaneous |
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What creates a chemical change in electrolytic cell |
Electricity |
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Where does aluminum naturally come from and what process creates it |
Bauxite Ore; electrolysis |
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what type of energy change occurs in a voltaic cell? In an electrolytic cell? |
Voltaic - chemical to electrical Electrolytic - electrical to chemical |
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What is the overall reaction for a fuel cell and why are scientists trying to develop fuel cells for cars? |
2h2 + o2 ➡ 2h2o |
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Briefly describe the process of electroplating |
electrolytic process Anode has plating metal Cathode has the object to be plated Electroplating electrolytic process Anode has plating metalCathode has the object to be platedBattery(+)-anode, pulls e and ag(-)- cathode sends e to object Battery (+)-anode, pulls e and ag (-)- cathode sends e to object |
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How does a rechargeable battery act as both a galvanic and electrolytic cell |
Galvanic chemical to electrical voltaic electrolytic Electrical to chemical |
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What is galvanizing and how does it work |
Add zinc coating to iron zinc is more easily oxidized than iron so it reacts before iron and slows rusting |
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How do rechargeable battery works? voltaic and electrolytic |
As a voltaic cell: chemical to electrical As an electrolytic cell: electrical to chemical |
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Explain the process of electroplating an object with silver |
Example: silver Anode has the plating metal Cathode has the object to be plated (+) terminal Connects to the anode (silver) Pulls e away from silver Ag goes into the solution of ag (cn) 2 (-) terminal Connects to the cathode (jewelry) Sends e to jewelry Ag is attracted to (-) charge at the cathode and plates the jewelry |
