2025 UPDATE AQA A Level
Chemistry 7405 |COMPREHENSIVE
QUESTIONS AND VERIFIED
ANSWERS WITH RATIONALES|GET
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,Terms in this set (119)
The average mass of an atom of an
Relative atomic
element, relative to 1/12th of the mass
mass
of an atom of Carbon-12
Average mass of a molecule
Relative
compared to 1/12th of the mass of a
molecular mass
carbon-12 atom
The Avogradro the number of particles in a mole
constant
ideal gas pV = nRT
equation
the simplest whole number ratio of
empirical formula atoms of each element in a
compound
percentage atom (Mass of desired product/total mass
economy of reactants) x 100
the electrostatic attraction between
ionic bonding
oppositely charged ions in a lattice
a shared pair of electrons between
covalent bond
non-metal elements
, a shared pair of electrons where both
co-ordinate bond
electrons are supplied by one atom
repulsion in Lone pair-lone pair > lone pair-
shapes of bonding pair > bonding pair-bonding
molecules pair
the power of an atom to attract the
electronegativity
pair of electrons in a covalent bond
Total enthalpy change for a reaction is
hess' law
independent of the route chosen
The energy required to break a
covalent bond into gaseous atoms
mean bond
averaged over different molecules
enthalpy
Bonds broken - bonds made
The minimum amount of energy
activation energy
needed to start a chemical reaction
A substance that increases the rate of
a chemical reaction without being
catalyst changed by providing an alternative
reaction pathway by lowering
activation energy
Chemistry 7405 |COMPREHENSIVE
QUESTIONS AND VERIFIED
ANSWERS WITH RATIONALES|GET
IT 100% CORRECT |already graded
A+
Save
Practice questions for this set
Learn
Studied 7 terms
Nice work, you're crushing it
Continue studying in Learn
,Terms in this set (119)
The average mass of an atom of an
Relative atomic
element, relative to 1/12th of the mass
mass
of an atom of Carbon-12
Average mass of a molecule
Relative
compared to 1/12th of the mass of a
molecular mass
carbon-12 atom
The Avogradro the number of particles in a mole
constant
ideal gas pV = nRT
equation
the simplest whole number ratio of
empirical formula atoms of each element in a
compound
percentage atom (Mass of desired product/total mass
economy of reactants) x 100
the electrostatic attraction between
ionic bonding
oppositely charged ions in a lattice
a shared pair of electrons between
covalent bond
non-metal elements
, a shared pair of electrons where both
co-ordinate bond
electrons are supplied by one atom
repulsion in Lone pair-lone pair > lone pair-
shapes of bonding pair > bonding pair-bonding
molecules pair
the power of an atom to attract the
electronegativity
pair of electrons in a covalent bond
Total enthalpy change for a reaction is
hess' law
independent of the route chosen
The energy required to break a
covalent bond into gaseous atoms
mean bond
averaged over different molecules
enthalpy
Bonds broken - bonds made
The minimum amount of energy
activation energy
needed to start a chemical reaction
A substance that increases the rate of
a chemical reaction without being
catalyst changed by providing an alternative
reaction pathway by lowering
activation energy
