OCR A level Chemistry Definitions
Study online at https://quizlet.com/_31l1dw
1. Activation Energy The minimum energy required to start a reaction by breaking bonds
in the reactants
2. Addition Polymer A very long molecular chain formed by repeated addition reactions
of many unsaturated alkene molecules
3. Addition Reaction A reaction in which a reactant is added to an unsaturated molecule
to make a saturated molecule
4. Acid Dissociation Constant Ka= [H+(aq)][A-(aq)]/[HA(aq)]
5. Aliphatic Hydrocarbon A hydrocarbon where carbon atoms are joined together in straight
or branched chains
6. Alkali A base that dissolves in water forming OH- ions
7. Alkanes The homologous series with general formula CnH2n+2
8. Alkylammonium salt A compound where the hydrogen's on an ammonium ion have
been substituted by alkyl chains
9. Alkylation Addition of hydrocarbon chains to an organic compound
10. Alkyl group An alkane with a hydrogen atom removed e.g. CH3, C2H5
11. Amide A compound with a functional group made of an alcyl group, which
is directly attached to an amine
12. Amphoteric chemicals Chemicals that can react with both acids and bases
, OCR A level Chemistry Definitions
Study online at https://quizlet.com/_31l1dw
13. Anion A negatively charged ion
14. Anhydrous A substance that contains no water molecules
15. Arrhenius plot A graph of lnK = lnA - Ea/R x 1/T
16. Atomic Orbital A region of space where you will likely find electrons. Each orbital
can hold 2 electrons, with opposite spins
17. Atomic number The number of protons in the nucleus of an atom
18. Average bond enthalpy The mean energy needed for 1 mole of a given type of gaseous
bonds to undergo homolytic fission
19. Avogadro constant The number of atoms per mole of the carbon-12 isotope
(6.02x10^23)
20. Base A chemical that will react with an acid
21. Benzene A naturally occurring aromatic compound, which is very stable pla-
nar ring structure with delocalized electrons
Study online at https://quizlet.com/_31l1dw
1. Activation Energy The minimum energy required to start a reaction by breaking bonds
in the reactants
2. Addition Polymer A very long molecular chain formed by repeated addition reactions
of many unsaturated alkene molecules
3. Addition Reaction A reaction in which a reactant is added to an unsaturated molecule
to make a saturated molecule
4. Acid Dissociation Constant Ka= [H+(aq)][A-(aq)]/[HA(aq)]
5. Aliphatic Hydrocarbon A hydrocarbon where carbon atoms are joined together in straight
or branched chains
6. Alkali A base that dissolves in water forming OH- ions
7. Alkanes The homologous series with general formula CnH2n+2
8. Alkylammonium salt A compound where the hydrogen's on an ammonium ion have
been substituted by alkyl chains
9. Alkylation Addition of hydrocarbon chains to an organic compound
10. Alkyl group An alkane with a hydrogen atom removed e.g. CH3, C2H5
11. Amide A compound with a functional group made of an alcyl group, which
is directly attached to an amine
12. Amphoteric chemicals Chemicals that can react with both acids and bases
, OCR A level Chemistry Definitions
Study online at https://quizlet.com/_31l1dw
13. Anion A negatively charged ion
14. Anhydrous A substance that contains no water molecules
15. Arrhenius plot A graph of lnK = lnA - Ea/R x 1/T
16. Atomic Orbital A region of space where you will likely find electrons. Each orbital
can hold 2 electrons, with opposite spins
17. Atomic number The number of protons in the nucleus of an atom
18. Average bond enthalpy The mean energy needed for 1 mole of a given type of gaseous
bonds to undergo homolytic fission
19. Avogadro constant The number of atoms per mole of the carbon-12 isotope
(6.02x10^23)
20. Base A chemical that will react with an acid
21. Benzene A naturally occurring aromatic compound, which is very stable pla-
nar ring structure with delocalized electrons
