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Flashcards: Electrochemistry 36 Flashcards 
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Electrochemistry focuses on generating electricity from ___ reactions and using electrical energy to drive ___ reactions. |
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Spontaneous; non-spontaneous |
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What are the two main types of electrochemical cells? |
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Galvanic (Voltaic) Cells and Electrolytic Cells |
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In a galvanic cell, the cathode is ___ with respect to the anode. |
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Positive |
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The flow of electrons in a galvanic cell is from the ___ to the ___. |
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Anode; cathode |
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What is the role of a salt bridge in an electrochemical cell? |
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It allows ions to flow between half cells while keeping their solutions separate. |
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The Nernst equation relates cell potential to ___ and the ___ of the reaction. |
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Gibbs free energy; reaction quotient |
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True or False: In an electrolytic cell, reduction occurs at the anode. |
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False; reduction occurs at the cathode. |
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Fill in the blank: The weight of a substance deposited at an electrode during electrolysis is directly proportional to the ___ passed through the solution. |
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Charge |
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What is the primary product at the cathode during the electrolysis of molten NaCl? |
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Sodium metal |
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What is the electrochemical equivalent (Z) in Faraday's first law of electrolysis? |
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The weight deposited by a 1-coulomb charge. |
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In a lead-acid battery, the positive plate is made of ___ and the negative plate is made of ___. |
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Lead dioxide; lead |
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True or False: Faraday's second law of electrolysis states that the weight of substances deposited is directly proportional to the charge passed. |
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True |
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What does the term 'electrolysis' refer to? |
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The decomposition of an electrolyte solution by electric current. |
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Riddle: I am an electrochemical device that can be recharged and used multiple times. What am I? |
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A secondary battery |
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What is a major limitation of fuel cells compared to traditional batteries? |
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Fuel cells require a continuous supply of reactants to generate electricity. |
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In the electrolysis of water, what is produced at the anode? |
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Oxygen gas |
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What is the function of the anode in an electrolytic cell? |
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It is the positively charged electrode where oxidation occurs. |
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What is the relationship between Gibbs free energy and electrode potential in electrochemical cells? |
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The relationship is given by the equation ΔG = -nFE, where ΔG is the change in Gibbs free energy, n is the number of moles of electrons transferred, F is Faraday's constant (approximately 96,500 C/mol), and E is the electromotive force (emf) of the cell. A negative ΔG indicates a spontaneous reaction, which corresponds to a positive E. |
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 Completed! Keep practicing to master all of them. |
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