AQA A2 chemistry unit 4 definitions

It's the definitions for chem 4 AQA.

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Rate of reaction
change in concentration of reactants or products in a given time (units are mol dm-3 s-1)
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Order of reaction
power of reactant’s concentration in the rate equation
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Overall order of reaction
sum of powers of concentration terms in rate equation
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Rate constant
the constant of proportionality, k, in the rate equation
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Homogeneous system
all reactants and products are in the same phase
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Heterogeneous system
reactants and products are not all in the same phase
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Bronsted-Lowry acid
proton donor
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Bronsted-Lowry base
proton acceptor
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Strong acid or base
fully dissociated in water
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Weak acid or base
partially dissociated in water
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pH
pH = -log10[H+]
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[H+]
10^-pH
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kw (ionic product of water)
Kw = [H+][OH-]
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ka
Ka = [H+][A-] / [HA]
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pka
pKa = -log[Ka]
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Buffer solution
resists changes in pH when small amount of acid or base is added
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Equivalence
Point in a titration where moles of acid equals moles of base
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Conjugate acid-base pairs
Two species differing by H+
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Zwitter ion
an ion, typically found in amino acids, that has both a positive and a negative charge
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Condensation ionisation
reaction between two different types of molecule to give a polymer accompanied by the loss of a small molecule such as water
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Stereoisomerism
Compounds with the same structural formula but different arrangements of atoms in space
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Chiral centre
carbon atom bonded to four different atoms or groups of atoms
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Optical isomerism
isomerism arising from molecules being chiral i.e. being non-superimposable mirror images
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Optical activity
ability of chiral molecules to rotate plane-polarised light
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Enantiomer
an optical isomer
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Racemate
equal mixture of enantiomers that is optically inactive
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Other cards in this set

Card 2

Front

power of reactant’s concentration in the rate equation

Back

Order of reaction

Card 3

Front

sum of powers of concentration terms in rate equation

Back

Preview of the back of card 3

Card 4

Front

the constant of proportionality, k, in the rate equation

Back

Preview of the back of card 4

Card 5

Front

all reactants and products are in the same phase

Back

Preview of the back of card 5
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