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AQA A Level Chemistry Definitions

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AQA A Level Chemistry

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AQA A Level Chemistry

AQA A Level Chemistry Definitions Relative Atomic Mass - answerThe weighted mean mass of an atom of an element relative to 1/12 of the mass of one atom of carbon-12 First Ionisation energy - answerThe energy required to remove an electron from each atom in one mole of gaseous atoms Acid - answ...

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aqa a level chemistry definitions

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©THEBRIGHT EXAM STUDY SOLUTIONS 8/26/2024 11:32 AM

AQA A Level Chemistry Definitions

Relative Atomic Mass - answer✔✔The weighted mean mass of an atom of an element relative to
1/12 of the mass of one atom of carbon-12

First Ionisation energy - answer✔✔The energy required to remove an electron from each atom in
one mole of gaseous atoms

Acid - answer✔✔A species that is a proton donor

Activation Energy - answer✔✔The minimum energy required to start a reaction by the breaking
of bonds

Addition Polymer - answer✔✔The process in which unsaturated alkene molecules ass on to a
growing polymer chain one at a time to form a very long saturated molecule chain

Addition Reaction - answer✔✔A reaction in which a reactant is added to an unsaturated
molecule to make a saturated molecule

Adsorption - answer✔✔The process that occurs when a gas, liquid or solid is held to the surface
of a solid, or, more rarely, a liquid

Alicyclic Hydrocarbon - answer✔✔A hydrocarbon with carbon atoms joined together in a ring
structure

Aliphatic Hydrocarbon - answer✔✔A hydrocarbon with carbon atoms joined together in straight
or branched chains

Alkali - answer✔✔A type of base that dissolves in water forming hydroxide ions

Alkanes - answer✔✔The homologous series with the general formula CnH2n+2

Alkyl Group - answer✔✔An alkane with a hydrogen ion removed. Alkyl groups are often shown
as 'R'

Amount of Substance - answer✔✔The quantity whose unit is the mole

Anhydrous - answer✔✔A substance containing no water molecules

Anion - answer✔✔A negatively charged ion

, ©THEBRIGHT EXAM STUDY SOLUTIONS 8/26/2024 11:32 AM

Atom Economy - answer✔✔(molecular mass of the desired product/sum of molecular masses of
all products) x100

Atomic Orbital - answer✔✔A region within an atom that can hold up to two electrons, with
opposite spins

Atomic Number - answer✔✔The number of protons in the nucleus of an atom

Average Bond Enthalpy - answer✔✔The average enthalpy change that takes place when
breaking by homolytic fission 1 mol of a given type of bond in the molecules of a gaseous
substance

Avogadro Constant - answer✔✔The number of atoms per mole of the carbon-12 isotope. (6.02 x
10^23)

Base - answer✔✔A species that is a proton acceptor

Biodegradable Material - answer✔✔A substance that is broken down naturally in the
environment of a living organism

Boltzmann Distribution - answer✔✔The distribution of energies of molecules at a particular
temperature, usually shown as a graph.

Bond Enthalpy - answer✔✔The enthalpy change hat takes place when breaking by homolytic
fission 1 mol of a given bond in the molecules of a gaseous species

Carbanion - answer✔✔An organic ion in which a carbon atom has a negative charge

Carbocation - answer✔✔An organic ion in which a carbon ion has a positive charge.

Catalyst - answer✔✔A substance that increases the rate of a chemical reaction without it being
used up

Cation - answer✔✔A positively charged ion

Cis-Trans Isomerism - answer✔✔A special type of E/Z isomerism in which there is a non-
hydrogen group and a hydrogen on each C of a C=C double bond: the cis isomer has the H atom
of each carbon on the same side, the trans isomer has the H atom of each carbon on different
sides

Compound - answer✔✔A substance formed from two or more chemically bonded elements in a
fixed ratio, usually shown by a chemical formula.

Concentration - answer✔✔The amount of solute, in mol, per 1 dm^2

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