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AQA A LEVEL Chemistry Exam 2024 Review
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AQA A LEVEL Chemistry Exam 2024 Review
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AQA A LEVEL Chemistry Exam2024 Review
Relative atomic mass - Answer>> The average mass of an
atom of an element, relative to 1/12th of the mass of an atom of
Carbon-12
Relative molecular mass - Answer>> Average mass of a
molecule compared to 1/12th of the mass of a carbon-12 atom
The Avogradro constant - Answer>> the number of particles in
a mole
ideal gas equation - Answer>> pV = nRT
empirical formula - Answer>> the simplest whole number ratio
of atoms of each element in a compound
percentage atom economy - Answer>> (Mass of desired
product/total mass of reactants) x 100
ionic bonding - Answer>> the electrostatic attraction between
oppositely charged ions in a lattice
covalent bond - Answer>> a shared pair of electrons between
non-metal elements
co-ordinate bond - Answer>> a shared pair of electrons where
both electrons are supplied by one atom
repulsion in shapes of molecules - Answer>> Lone pair-lone
pair > lone pair-bonding pair > bonding pair-bonding pair
, electronegativity - Answer>> the power of an atom to attract the
pair of electrons in a covalent bond
hess' law - Answer>> Total enthalpy change for a reaction is
independent of the route chosen
mean bond enthalpy - Answer>> The energy required to break
a covalent bond into gaseous atoms averaged over different
molecules
Bonds broken - bonds made
activation energy - Answer>> The minimum amount of energy
needed to start a chemical reaction
catalyst - Answer>> A substance that increases the rate of a
chemical reaction without being changed by providing an
alternative reaction pathway by lowering activation energy
Le Chatelier's principle - Answer>> When a system in dynamic
equilibrium is subjected to change, the position of equilibrium will
shift to oppose the change.
oxidising agents - Answer>> electron acceptors
reducing agents - Answer>> electron donors
Enthalpy of formation - Answer>> Enthalpy change when one
mole of a compound is formed from its constituent elements
under standard conditions in their standard states
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