OCR A LEVEL CHEMISTRY DEFINITIONS 2023- 2024
EXAM [ALREADY GRADED A+] WITH CORRECT
DETAILED
Amphoteric chemicals - ANSWER-Chemicals that can react with both acids and
bases
Anion - ANSWER-A negatively charged ion
Anhydrous - ANSWER-A substance that contains no water molecules
Arrhenius plot - ANSWER-A graph of lnK = lnA - Ea/R x 1/T
Atomic Orbital - ANSWER-A region of space where you will likely find electrons.
Each orbital can hold 2 electrons, with opposite spins
Atomic number - ANSWER-The number of protons in the nucleus of an atom
Average bond enthalpy - ANSWER-The mean energy needed for 1 mole of a
given type of gaseous bonds to undergo homolytic fission
Avogadro constant - ANSWER-The number of atoms per mole of the carbon-12
isotope (6.02x10^23)
Base - ANSWER-A chemical that will react with an acid
Activation Energy - ANSWER-The minimum energy required to start a reaction
by breaking bonds in the reactants
Addition Polymer - ANSWER-A very long molecular chain formed by repeated
addition reactions of many unsaturated alkene molecules
Addition Reaction - ANSWER-A reaction in which a reactant is added to an
unsaturated molecule to make a saturated molecule
Acid Dissociation Constant - ANSWER-Ka= [H+(aq)][A-(aq)]/[HA(aq)]
Aliphatic Hydrocarbon - ANSWER-A hydrocarbon where carbon atoms are
joined together in straight or branched chains
Alkali - ANSWER-A base that dissolves in water forming OH- ions
Alkanes - ANSWER-The homologous series with general formula CnH2n+2
Alkylammonium salt - ANSWER-A compound where the hydrogen's on an
ammonium ion have been substituted by alkyl chains
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