AQA A-LEVEL CHEMISTRY
CERTIFICATION PAPER 2026 ACCURATE
SOLUTIONS GRADED A+
◉ Arrhenius Equation. Answer: k=Ae^(-Ea/RT)
lnk = lnA - Ea/RT
◉ Oxidation. Answer: The loss of electrons / loss of hydrogen / gain
of oxygen
◉ Standard state. Answer: The normal stable state of an element or
compound under standard conditions
◉ Percentage yield. Answer: The actual mass of product obtained in
a reaction expressed as a percentage of the theoretical mass
calculated from the balanced equation
Mass of product obtained / max theoretical product mass *100
◉ Cracking. Answer: The breaking up of larger hydrocarbon
molecules into smaller, more useful ones
◉ Free radical. Answer: A species with an unpaired electron
, ◉ Ionic bonding. Answer: Ions are formed when atoms lose or gain
electrons. There is a strong electrostatic attraction between
oppositely charged ions in a lattice
◉ Exothermic. Answer: A change in which energy is released
◉ Metallic bonding. Answer: Attraction between delocalised
electrons and positive ions arranged in a lattice.
◉ Covalent bond. Answer: A shared pair of electrons between 2
atoms
◉ Percentage atom economy. Answer: The ratio between the mass
of the desired products and the total mass of the reactants
Wanted product Mr / Ar / total Ar / Mr of reactants *100
◉ Both mole equations. Answer: n = mass / Mr
n=c*v
◉ Avogadro Constant, L. Answer: The number of C12 atoms in
exactly 12 grams of carbon-12
CERTIFICATION PAPER 2026 ACCURATE
SOLUTIONS GRADED A+
◉ Arrhenius Equation. Answer: k=Ae^(-Ea/RT)
lnk = lnA - Ea/RT
◉ Oxidation. Answer: The loss of electrons / loss of hydrogen / gain
of oxygen
◉ Standard state. Answer: The normal stable state of an element or
compound under standard conditions
◉ Percentage yield. Answer: The actual mass of product obtained in
a reaction expressed as a percentage of the theoretical mass
calculated from the balanced equation
Mass of product obtained / max theoretical product mass *100
◉ Cracking. Answer: The breaking up of larger hydrocarbon
molecules into smaller, more useful ones
◉ Free radical. Answer: A species with an unpaired electron
, ◉ Ionic bonding. Answer: Ions are formed when atoms lose or gain
electrons. There is a strong electrostatic attraction between
oppositely charged ions in a lattice
◉ Exothermic. Answer: A change in which energy is released
◉ Metallic bonding. Answer: Attraction between delocalised
electrons and positive ions arranged in a lattice.
◉ Covalent bond. Answer: A shared pair of electrons between 2
atoms
◉ Percentage atom economy. Answer: The ratio between the mass
of the desired products and the total mass of the reactants
Wanted product Mr / Ar / total Ar / Mr of reactants *100
◉ Both mole equations. Answer: n = mass / Mr
n=c*v
◉ Avogadro Constant, L. Answer: The number of C12 atoms in
exactly 12 grams of carbon-12
