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OCR A Level Chemistry Questions & 100%
Correct Answers- Latest Test | Graded A+
| Passed
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
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֎ -:- 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.
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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
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֎ -:- 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).
26/08/2024 | © Copyright- This work may not be copied for profit.
OCR A Level Chemistry Questions & 100%
Correct Answers- Latest Test | Graded A+
| Passed
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
26/08/2024 | © Copyright- This work may not be copied for profit.
, Excellence is key | 2024/2025 ~Page |2
֎ -:- 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.
26/08/2024 | © Copyright- This work may not be copied for profit.
, Excellence is key | 2024/2025 ~Page |3
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
26/08/2024 | © Copyright- This work may not be copied for profit.
, Excellence is key | 2024/2025 ~Page |4
֎ -:- 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).
26/08/2024 | © Copyright- This work may not be copied for profit.
