AQA A LEVEL CHEMISTRY DEFINITIONS MID-TERM EXAM
Aliphatic Hydrocarbon - ANSWER-A hydrocarbon with carbon atoms joined together in
straight or branched chains
Alkali - ANSWER-A type of base that dissolves in water forming hydroxide ions
Alkanes - ANSWER-The homologous series with the general formula CnH2n+2
Alkyl Group - ANSWER-An alkane with a hydrogen ion removed. Alkyl groups are often
shown as 'R'
Amount of Substance - ANSWER-The quantity whose unit is the mole
Anhydrous - ANSWER-A substance containing no water molecules
Anion - ANSWER-A negatively charged ion
Atom Economy - ANSWER-(molecular mass of the desired product/sum of molecular
masses of all products) x100
Atomic Orbital - ANSWER-A region within an atom that can hold up to two electrons,
with opposite spins
Atomic Number - ANSWER-The number of protons in the nucleus of an atom
Average Bond Enthalpy - ANSWER-The average enthalpy change that takes place when
breaking by homolytic fission 1 mol of a given type of bond in the molecules of a
gaseous substance
Avogadro Constant - ANSWER-The number of atoms per mole of the carbon-12 isotope.
(6.02 x 10^23)
Base - ANSWER-A species that is a proton acceptor
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