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PHS Chapters 21 & 22 "Oxidation Reduction and Electrochemistry

Test your understanding of the concepts presented in your study of oxidation reduction reactions and electrochemistry.

AB
combustiona chemical change in which oxygen reacts with another substance often producing energy in the form of heat and light
oxidationcomplete or partial loss of electrons or gain of oxygen
oxidizing agenta substance that accepts electrons in a redox reaction
corrosionoxidation of metals to metallic ions by oxygen and water in the environment
zinca metal that loses electrons easily
golda metal that resists corrosion
half-reaction methodbalancing a redox equation by first balancing the oxidation and reduction half-reactions
spectator ionsions that are present but do not participate in or change during the reaction
anionsions that can serve as reducing agents
oxidation half-reactionFe2+  Fe3+ + e-
half-reactionequation showing either the reduction or the oxidation of a species in an oxidation-reduction reaction
oxidation-number change methodbalancing a redox equation by comparing the increase and decrease in oxidation numbers
reduction half-reaction2e- + Br2  2Br-
half-reactiona reaction that involves the transfer of electrons between reactants during a chemical change
half-reaction methoda method for balancing a redox equation by balancing the oxidation and reduction half-reactions
oxidationa process that involves complete or partial loss of electrons or a gain of oxygen; it results in an increase in the oxidation number of an atom
oxidation numbera positive or negative number assigned to a combined atom according to a set of arbitrary rules
oxidation-number-change methoda method of balancing a redox equation by comparing the increases and decreases in oxidation numbers
oxidation-reduction reactionan equation showing either the reduction or the oxidation of a species in an oxidation-reduction reaction
oxidizing agentsubstance in a redox reaction that accepts electrons
redox reactionanother name for an oxidation-reduction reaction
reducing agenta substance in a redox reaction that donates electrons
reductiona process that involves a complete or partial gain of electrons or the loss of oxygen; it results in a decrease in the oxidation number of an atom
dry cella commercial voltaic cell in which the electrolyte is a moist paste
voltaic cellselectrochemical cells used to convert chemical energy into electrical energy
cathodethe electrode at which reduction occurs
batterya group of voltaic cells that are connected together
fuel cella voltaic cell in which a fuel substance undergoes oxidation to continuously produce electrical energy
electrochemical cellany device that converts chemical energy into electrical energy or electrical energy into chemical energy
anodethe electrode at which oxidation occurs
electrical potentialthe measure of a cell's ability to produce an electric current
reduction potentialthe tendency of a given half-reaction to occur as a reduction
spontaneous reactiona reaction having a positive cell potential
0.00 Vthe standard reduction potential of the hydrogen electrode
cell potentialthe difference between the reduction potentials of the two half-cells
E oxidstandard reduction potential for the oxidation half-cell
electrolysisthe process in which electrical energy is used to make a nonspontaneous reaction go forward
electrolytic cellan electrochemical cell used to cause a chemical change through the application of electrical energy
brinea concentrated solution of sodium chloride
electroplatingthe deposition of a thin layer of metal on an object in an electrolytic cell
electro refiningan electrolytic method for obtaining ultrapure metals


Science Instructor
Scarsdale, NY

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