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AQA 2023 AS CHEMISTRY 7404 Paper 1 Question Papers & Mark schemes[verified]|
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AQA 2023 AS CHEMISTRY 7404 Paper 1Question Papers & Mark
schemes[verified]|
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
Enthalpy of atomization -
✔✔ANSWER✔✔The energy required to
produce one mole of gaseous atoms
from an element in its standard state
Electron affinity - ✔✔ANSWER✔✔the
enthaply change when one mole of
gaseous atoms forms one mole of -1 ions
Lattice enthalpy of formation -
✔✔ANSWER✔✔Enthalpy change when
one mole of a solid ionic compound is
,formed from its constituent ions in the
gas phase
Lattice enthalpy of dissociation -
✔✔ANSWER✔✔Energy change when 1
mol of an ionic lattice dissociates to its
gaseous ions.
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
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