AQA A LEVEL Chemistry
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
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
