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Alkenes key terms
Use these key terms for Alkenes in AQA Chemistry 7405. The page is built from approved learning objectives for this topic and links back to the wider unit, topic hub, and related revision assets.
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key terms
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Alkenes
Key terms
alkene
A type of unsaturated hydrocarbon that contains at least one carbon-carbon double bond (C=C).
unsaturated hydrocarbon
A hydrocarbon that contains one or more double or triple bonds between carbon atoms, allowing for additional hydrogen atoms to be added.
alkene
A type of unsaturated hydrocarbon containing at least one carbon-carbon double bond (C=C). In Structure, bonding and reactivity, alkene is used to explain explain bonding in alkenes using sigma and pi bonds with A-Level Chemistry precision.
pi bond
A type of covalent bond formed by the sideways overlap of p orbitals, present in double bonds alongside a sigma bond.
C=C bond
The double bond between two carbon atoms in alkenes, consisting of one sigma bond and one pi bond.
electrophile
A species that is attracted to electrons and can accept an electron pair, often attacking the C=C bond in alkenes.
bromine water
A solution of bromine in water used to test for unsaturation in organic compounds. In Structure, bonding and reactivity, bromine water is used to explain use bromine water to test for unsaturation with A-Level Chemistry precision.
unsaturation test
A qualitative test that indicates the presence of double or triple bonds in a compound, typically resulting in a color change when bromine water is added.
Electrophilic addition
A reaction where an electrophile reacts with a nucleophile, resulting in the addition of atoms or groups across a double bond.
Hydrogen bromide
A diatomic molecule (HBr) that acts as an electrophile in the electrophilic addition reaction with alkenes.
alkene
A hydrocarbon that contains at least one carbon-carbon double bond (C=C), making it unsaturated.
carbocation
A positively charged ion (cation) that has a carbon atom with only three bonds, resulting in an empty p-orbital.
alkene
A hydrocarbon that contains at least one carbon-carbon double bond (C=C), making it unsaturated.
electrophilic addition
A reaction where an electrophile reacts with a nucleophile, resulting in the addition of atoms or groups across a double bond.
alkene
A hydrocarbon that contains at least one carbon-carbon double bond (C=C), making it unsaturated.
hydration
The process of adding water to an alkene to form an alcohol, typically involving the addition of H2O across the double bond.
alkene
A type of unsaturated hydrocarbon that contains at least one carbon-carbon double bond (C=C).
repeat unit
The specific arrangement of atoms that repeats in a polymer, derived from the alkene monomer.
Monomer
The individual alkene unit that polymerises to form an addition polymer repeat unit. In Addition polymers, Monomer is used to explain identify monomers from addition polymer repeat units with A-Level Chemistry precision.
Repeat unit
The structural motif that repeats along the backbone of an addition polymer, derived from the monomer.
addition polymerisation
The process in which monomers with C=C bonds react to form a polymer through repeated addition.
C=C bond
A double bond between two carbon atoms, characteristic of alkenes, that is reactive in addition reactions.
addition polymer
A polymer formed from the addition of monomers with unsaturated bonds, typically through a process that involves the breaking of double bonds.
condensation polymer
A polymer formed through a condensation reaction, where monomers join together with the elimination of a small molecule, such as water.
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