A2 Chemistry Definitions

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Arene
An aromatic hydrocarbon containing one or more benzene ring
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Aromatic
Any compound containing one or more benzene ring
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Optical Isomers
A stereoisomers that are non-superimposable mirror images of each other
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Chiral carbon
A carbon that is attached to four different atoms or groups of atoms
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Rate of Reaction
The change in concentration of a reactant or product per unit time
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Order
The power to which the concentration of the reactant is raised in the rate equation
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Half Life
The time taken for the concentration of a reactant to reduce by half
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Conjugate acid-base pairs
A pair of acid-bases that are formed from one species loosing or gaining a proton
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pH
-log [H+]
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[H+]
10(^-pH)
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Enthalpy Change of Neutralisation
The energy change that accompanies the neutralisation of an aqueous acid by an aqueous base to form one mole of water(l) under standard conditions
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Lattice Enthalpy
The enthalpy change that accompanies the formation of one mole of ionic compound from its gaseous ions under standard conditions
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Entropy
The quantitative measure of the degree of disorder in a system
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Redox
A reaction in which both reduction and oxidation takes place
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Oxidation Number
A measure of the number of electrons that n atom uses to bond with atoms of another element.
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Half Reaction
(Either) the oxidation or reduction reaction within a redox reaction.
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Oxidising Agent
A reagent that oxidises (takes electrons from) another species
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Reducing Agent
A reagent that reduces (donates electrons to) another species
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Standard Electrode Potential
The e.m.f. of a half cell compared with a standard hydrogen half cell, measured at 298K and a concentration of 1 mol dm^-3 and a gas pressure of 100 kPa
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Ligand
A molecule or ion that can donate a pair of electrons with the transition metal ion to form a coordinate bond.
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Coordinate Bond
A shared pair of electrons in which the bonded pair has been provided by one of the bonding atoms only.
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Complex Ion
A transition metal ion bonded to one or more ligands by coordinate bonds.
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Coordinate Number
The total number of coordinate bonds formed between the central metal ion and any ligands
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Stereoisomerism
Species with the same structural formula but with a different arrangement of the atoms in space.
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Stability Constant
The equilibrium constant for an equilibrium existing between a transition metal ion surrounded by water ligands and the complex formed when the same ion has undergone a ligand substitution reaction.
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Other cards in this set

Card 2

Front

Any compound containing one or more benzene ring

Back

Aromatic

Card 3

Front

A stereoisomers that are non-superimposable mirror images of each other

Back

Preview of the back of card 3

Card 4

Front

A carbon that is attached to four different atoms or groups of atoms

Back

Preview of the back of card 4

Card 5

Front

The change in concentration of a reactant or product per unit time

Back

Preview of the back of card 5
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