OCR A LEVEL CHEMISTRY EXAMINATION- 2026
CORE DEFINITIONS & KEY TERMINOLOGY
(Fundamental Concepts Across Physical, Organic & Inorganic Chemistry)
Qualification: A Level Chemistry (OCR Specification A)
Paper Code: H432/01
Topic Area: Definitions & Chemical Language
Date: __________________________
Time: __________________________
Duration: 1 Hour 30 Minutes
Total Marks: 60
INSTRUCTIONS TO CANDIDATES
Answer ALL questions.
Define each term clearly, concisely, and precisely using correct scientific
language.
Avoid vague statements; marks are awarded for accuracy and completeness.
Use equations or examples where appropriate to support definitions.
Write legibly in black ink.
A Data Sheet is provided.
,ASSESSMENT FOCUS
Fundamental definitions (e.g., mole, molar mass, Avogadro constant)
Bonding terminology (ionic, covalent, dative bonding)
Energetics (enthalpy changes, activation energy)
Kinetics and equilibrium terms
Acids and bases (Brønsted–Lowry theory)
Redox definitions (oxidation states, electron transfer)
Organic chemistry terminology (functional groups, isomerism)
CANDIDATE DETAILS
Full Name: ____________________________________________
Candidate Number: _____________________________________
Centre Number: ________________________________________
Signature: ____________________________________________
FOR EXAMINER’S USE ONLY
Question Marks Available Marks Awarded
1
2
3
…
Total 60
, Activation Energy
The minimum energy required to start a reaction by breaking bonds in the reactants
Addition Polymer
A very long molecular chain formed by repeated addition reactions of many unsaturated alkene
molecules
Addition Reaction
A reaction in which a reactant is added to an unsaturated molecule to make a saturated
molecule
Acid Dissociation Constant
Ka= [H+(aq)][A-(aq)]/[HA(aq)]
Aliphatic Hydrocarbon
A hydrocarbon where carbon atoms are joined together in straight or branched chains
Alkali
A base that dissolves in water forming OH- ions
CORE DEFINITIONS & KEY TERMINOLOGY
(Fundamental Concepts Across Physical, Organic & Inorganic Chemistry)
Qualification: A Level Chemistry (OCR Specification A)
Paper Code: H432/01
Topic Area: Definitions & Chemical Language
Date: __________________________
Time: __________________________
Duration: 1 Hour 30 Minutes
Total Marks: 60
INSTRUCTIONS TO CANDIDATES
Answer ALL questions.
Define each term clearly, concisely, and precisely using correct scientific
language.
Avoid vague statements; marks are awarded for accuracy and completeness.
Use equations or examples where appropriate to support definitions.
Write legibly in black ink.
A Data Sheet is provided.
,ASSESSMENT FOCUS
Fundamental definitions (e.g., mole, molar mass, Avogadro constant)
Bonding terminology (ionic, covalent, dative bonding)
Energetics (enthalpy changes, activation energy)
Kinetics and equilibrium terms
Acids and bases (Brønsted–Lowry theory)
Redox definitions (oxidation states, electron transfer)
Organic chemistry terminology (functional groups, isomerism)
CANDIDATE DETAILS
Full Name: ____________________________________________
Candidate Number: _____________________________________
Centre Number: ________________________________________
Signature: ____________________________________________
FOR EXAMINER’S USE ONLY
Question Marks Available Marks Awarded
1
2
3
…
Total 60
, Activation Energy
The minimum energy required to start a reaction by breaking bonds in the reactants
Addition Polymer
A very long molecular chain formed by repeated addition reactions of many unsaturated alkene
molecules
Addition Reaction
A reaction in which a reactant is added to an unsaturated molecule to make a saturated
molecule
Acid Dissociation Constant
Ka= [H+(aq)][A-(aq)]/[HA(aq)]
Aliphatic Hydrocarbon
A hydrocarbon where carbon atoms are joined together in straight or branched chains
Alkali
A base that dissolves in water forming OH- ions
