OCR A LEVEL CHEMISTRY NEW REVISION QUESTIONS AND ANSWERS 2022
acid - A species that is a proton donor.
activation energy - The minimum amount of kinetic energy that particles need to have in order to
react when they collide
addition polymer - A very long molecular chain formed by repeated addition reactions of many
unsaturated alkene molecules (monomers).
addition polymerisation - The process in which unsaturated alkene molecules (monomers) add on to
a growing polymer chain one at a time to form a very long saturated molecular chain (the addition
polymer).
addition reaction - A reaction in which a reactant is added to an unsaturated molecule to make a
saturated molecule.
adsorption - The process that occurs when a gas, liquid or solute is held to the surface of a solid or,
more rarely, a liquid.
alicyclic hydrocarbon - A hydrocarbon with carbon atoms joined together in a ring structure.
aliphatic hydrocarbon - A hydrocarbon with carbon atoms joined together in straight or branched
chains.
alkali - A type of base that dissolves in water forming hydroxide ions, OH- (aq) ions.
alkanes - The homologous series with the general formula: CnH2n+2.
alkyl group - An alkane with a hydrogen atom removed, e.g. CH3, C2H5; alkyl groups are often shown
as 'R'.
, amount of substance - The quantity whose unit of the mole. Chemists use 'amount of substance' as a
means of counting atoms.
anhydrous - A substance that contains no water molecules.
anion - A negatively charged ion.
atom economy - atom economy = molecular mass of the desired product ×100 sum of molecular
masses of all products
atomic orbital - A region within an atom that can hold up to two electrons, with opposite spins.
atomic (proton) number - The number of protons in the nucleus of an atom
acid - A species that is a proton donor.
activation energy - The minimum energy required to start a reaction by the breaking of bonds.
addition polymer - A very long molecular chain formed by repeated addition reactions of many
unsaturated alkene molecules (monomers).
addition polymerisation - The process in which unsaturated alkene molecules (monomers) add on to
a growing polymer chain one at a time to form a very long saturated molecular chain (the addition
polymer).
addition reaction - A reaction in which a reactant is added to an unsaturated molecule to make a
saturated molecule.
adsorption - The process that occurs when a gas, liquid or solute is held to the surface of a solid or,
more rarely, a liquid.
acid - A species that is a proton donor.
activation energy - The minimum amount of kinetic energy that particles need to have in order to
react when they collide
addition polymer - A very long molecular chain formed by repeated addition reactions of many
unsaturated alkene molecules (monomers).
addition polymerisation - The process in which unsaturated alkene molecules (monomers) add on to
a growing polymer chain one at a time to form a very long saturated molecular chain (the addition
polymer).
addition reaction - A reaction in which a reactant is added to an unsaturated molecule to make a
saturated molecule.
adsorption - The process that occurs when a gas, liquid or solute is held to the surface of a solid or,
more rarely, a liquid.
alicyclic hydrocarbon - A hydrocarbon with carbon atoms joined together in a ring structure.
aliphatic hydrocarbon - A hydrocarbon with carbon atoms joined together in straight or branched
chains.
alkali - A type of base that dissolves in water forming hydroxide ions, OH- (aq) ions.
alkanes - The homologous series with the general formula: CnH2n+2.
alkyl group - An alkane with a hydrogen atom removed, e.g. CH3, C2H5; alkyl groups are often shown
as 'R'.
, amount of substance - The quantity whose unit of the mole. Chemists use 'amount of substance' as a
means of counting atoms.
anhydrous - A substance that contains no water molecules.
anion - A negatively charged ion.
atom economy - atom economy = molecular mass of the desired product ×100 sum of molecular
masses of all products
atomic orbital - A region within an atom that can hold up to two electrons, with opposite spins.
atomic (proton) number - The number of protons in the nucleus of an atom
acid - A species that is a proton donor.
activation energy - The minimum energy required to start a reaction by the breaking of bonds.
addition polymer - A very long molecular chain formed by repeated addition reactions of many
unsaturated alkene molecules (monomers).
addition polymerisation - The process in which unsaturated alkene molecules (monomers) add on to
a growing polymer chain one at a time to form a very long saturated molecular chain (the addition
polymer).
addition reaction - A reaction in which a reactant is added to an unsaturated molecule to make a
saturated molecule.
adsorption - The process that occurs when a gas, liquid or solute is held to the surface of a solid or,
more rarely, a liquid.
