AQA A LEVEL Chemistry
Relative atomic mass - Correct Answers-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 - Correct Answers-Average mass of a molecule compared to 1/12th of
the mass of a carbon-12 atom
The Avogradro constant - Correct Answers-the number of particles in a mole
ideal gas equation - Correct Answers-pV = nRT
empirical formula - Correct Answers-the simplest whole number ratio of atoms of each element
in a compound
percentage atom economy - Correct Answers-(Mass of desired product/total mass of reactants)
x 100
ionic bonding - Correct Answers-the electrostatic attraction between oppositely charged ions in
a lattice
covalent bond - Correct Answers-a shared pair of electrons between non-metal elements
co-ordinate bond - Correct Answers-a shared pair of electrons where both electrons are
supplied by one atom
repulsion in shapes of molecules - Correct Answers-Lone pair-lone pair > lone pair-bonding pair
> bonding pair-bonding pair
electronegativity - Correct Answers-the power of an atom to attract the pair of electrons in a
covalent bond
hess' law - Correct Answers-Total enthalpy change for a reaction is independent of the route
chosen
mean bond enthalpy - Correct Answers-The energy required to break a covalent bond into
gaseous atoms averaged over different molecules
, Bonds broken - bonds made
activation energy - Correct Answers-The minimum amount of energy needed to start a chemical
reaction
catalyst - Correct Answers-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 - Correct Answers-When a system in dynamic equilibrium is subjected to
change, the position of equilibrium will shift to oppose the change.
oxidising agents - Correct Answers-electron acceptors
reducing agents - Correct Answers-electron donors
Enthalpy of formation - Correct Answers-Enthalpy change when one mole of a compound is
formed from its constituent elements under standard conditions in their standard states
Enthalpy of atomization - Correct Answers-The energy required to produce one mole of
gaseous atoms from an element in its standard state
Electron affinity - Correct Answers-the enthaply change when one mole of gaseous atoms forms
one mole of -1 ions
Lattice enthalpy of formation - Correct Answers-Enthalpy change when one mole of a solid ionic
compound is formed from its constituent ions in the gas phase
Lattice enthalpy of dissociation - Correct Answers-Energy change when 1 mol of an ionic lattice
dissociates to its gaseous ions.
standard electrode potential - Correct Answers-298K
100kPa
1.00moldm-3
Electrode reactions in lithium cell
(positive electrode) - Correct Answers-Li+ + CoO2 + e- → Li+[CoO2]-
Electrode reactions in lithium cell
(negative electrode) - Correct Answers-Li → Li+ + e-
Relative atomic mass - Correct Answers-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 - Correct Answers-Average mass of a molecule compared to 1/12th of
the mass of a carbon-12 atom
The Avogradro constant - Correct Answers-the number of particles in a mole
ideal gas equation - Correct Answers-pV = nRT
empirical formula - Correct Answers-the simplest whole number ratio of atoms of each element
in a compound
percentage atom economy - Correct Answers-(Mass of desired product/total mass of reactants)
x 100
ionic bonding - Correct Answers-the electrostatic attraction between oppositely charged ions in
a lattice
covalent bond - Correct Answers-a shared pair of electrons between non-metal elements
co-ordinate bond - Correct Answers-a shared pair of electrons where both electrons are
supplied by one atom
repulsion in shapes of molecules - Correct Answers-Lone pair-lone pair > lone pair-bonding pair
> bonding pair-bonding pair
electronegativity - Correct Answers-the power of an atom to attract the pair of electrons in a
covalent bond
hess' law - Correct Answers-Total enthalpy change for a reaction is independent of the route
chosen
mean bond enthalpy - Correct Answers-The energy required to break a covalent bond into
gaseous atoms averaged over different molecules
, Bonds broken - bonds made
activation energy - Correct Answers-The minimum amount of energy needed to start a chemical
reaction
catalyst - Correct Answers-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 - Correct Answers-When a system in dynamic equilibrium is subjected to
change, the position of equilibrium will shift to oppose the change.
oxidising agents - Correct Answers-electron acceptors
reducing agents - Correct Answers-electron donors
Enthalpy of formation - Correct Answers-Enthalpy change when one mole of a compound is
formed from its constituent elements under standard conditions in their standard states
Enthalpy of atomization - Correct Answers-The energy required to produce one mole of
gaseous atoms from an element in its standard state
Electron affinity - Correct Answers-the enthaply change when one mole of gaseous atoms forms
one mole of -1 ions
Lattice enthalpy of formation - Correct Answers-Enthalpy change when one mole of a solid ionic
compound is formed from its constituent ions in the gas phase
Lattice enthalpy of dissociation - Correct Answers-Energy change when 1 mol of an ionic lattice
dissociates to its gaseous ions.
standard electrode potential - Correct Answers-298K
100kPa
1.00moldm-3
Electrode reactions in lithium cell
(positive electrode) - Correct Answers-Li+ + CoO2 + e- → Li+[CoO2]-
Electrode reactions in lithium cell
(negative electrode) - Correct Answers-Li → Li+ + e-
