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AQA A LEVEL CHEMISTRY DEFINITIONS MID-TERM EXAM

AQA A LEVEL CHEMISTRY DEFINITIONS MID-TERM EXAM

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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