Integrated SequencePhysics Chemistry Organic Biology

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Module 12 in the Syllabus

Redox and Electrochemitry Practice
Problem set for Oxidation-Reduction & Electrochemistry in PDF format

Answer Key
Answers and explanations

Oxidation-Reduction Images
Image gallery for study with links to larger teaching JPEGs for classroom presentation

Question Drill for Oxidation-Reduction
Conceptual Vocabulary Self-Test

Basic Terms Crossword Puzzle

Basic Puzzle Solution

Conceptual Vocabulary
RedoxRedox, shorthand for reduction/oxidation reaction, is a term used to describe chemical reactions in which atoms have their oxidation state changed.
Oxidizing agentAn oxidizing agent is a substance that gains electrons in a redox chemical reaction.
Reducing agentA reducing agent is the element or a compound that reduces another species in a redox reaction. It is the electron donor in the redox.
Oxidation numberWithin a molecule or complex, the oxidation number of an element is the charge that it would have if the compound were composed of ions, with assignment of shared electrons based on electronegativity.
Oxidation stateThe oxidation state is an indicator of the degree of oxidation of an atom in a chemical compound. It is usually numerically equal to the oxidation number.
Half-reactionA half reaction is either the oxidation or reduction reaction component of a redox reaction.
Reduction potentialStandard reduction potential is the tendency of a chemical species to acquire electrons and thereby be reduced.
Electron transferElectron transfer is the process by which an electron moves from one atom or molecule to another atom or molecule.
Electron acceptorA terminal electron acceptor is a compound that receives or accepts an electron during cellular respiration or photosynthesis.
Electron donorIn general terms, an electron donor gives up an electron during cellular respiration.
SuperoxideSuperoxide is the free radical product of the one-electron reduction of dioxygen.
PeroxideA peroxide is a compound containing an oxygen-oxygen single bond.
Metathesis reactionMetathesis is a bimolecular process involving the exchange of bonds between the two reacting chemical species, which results in the creation of products with similar or identical bonding affiliations.
DenitrificationDenitrification is the process of reducing nitrate and nitrite, which can be thought of as the opposite of nitrogen fixation
OxidoreductaseAn oxidoreductase is an enzyme that catalyzes the transfer of electrons from one molecule to another.
Inner sphere electron transferInner sphere electron transfer proceeds via a covalent linkage between the two redox partners, the oxidant and the reductant.
Outersphere electron transferOuter sphere electron transfer refers to an electron transfer event that occurs between chemicals that remain separate species before, during, and after the electron transfer event.
Advanced terms that may appear in context in MCAT passages
Osmium tetroxideOsmium tetroxide is the chemical compound with one oxmium atom bonded to four oxygens. It is an important oxidizing agent in the laboratory.
PerchloratePerchlorates are the salts derived from perchloric acid, which are important oxidizing agents for their tendency not to react unless heated.
Redox signalingRedox signaling is the concept that free radicals, reactive oxygen species, and other electronically-activated species act as messengers in biological systems.
Marcus theoryMarcus Theory was originally developed to explain outer sphere electron transfer, but was later extended to inner sphere electron transfer by Noel Hush.

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