AQA AS Level Chemistry Paper 2
Question Paper 2025 AND2026
[VERIFIED]
Relative atomic mass (Ar) -ANSWER->>>>Average mass of an
atom compared with one twelth of the mass of an atom of
carbon 12
Electronegativity -ANSWER->>>>Power of an atom to attract
the pair of electrons in a covalent bond
Standard enthalpy of combustion -ANSWER->>>>Enthalpy
change when 1 mole of a substance burns completely in oxygen
under standard conditions with all reactants and products being
in their standard state
Standard enthalpy of formation -ANSWER->>>>Enthalpy
change when 1 mole of a compound is formed from it's elements
under standard conditions in their standard states
,Mean bond enthalpy -ANSWER->>>>The average energy
needed to break a certain type of bond over a range of
compounds
Activation energy -ANSWER->>>>Minimum energy required
for colliding molecules to react
Maxwell-Boltzmann distribution x and y axes -ANSWER-
>>>>x: Energy
y: fraction/number of molecules
What happens to the Maxwell-Boltzmann curve when
temperature increases -ANSWER->>>>Moves down and to the
right
Rate of reaction -ANSWER->>>>Rate at which product
formed/reactant used up
Order of reaction -ANSWER->>>>Power to which the
concentration of a species is raised in the rate equation
, rearrange k=Ae^-Ea/Rt -ANSWER->>>>lnk=-Ea/Rt+lnA
Conditions for thermal cracking -ANSWER->>>>High
temperature and high pressure
Products of thermal cracking -ANSWER->>>>High % of
alkenes
Conditions for catalytic cracking -ANSWER->>>>High
temperature ,slight pressure and in the presence of a zeolite
catalyst
Products of catalytic cracking -ANSWER->>>>Motor fuels and
aromatic hydrocarbons
Why do we crack alkanes? -ANSWER->>>>Smaller
alkanes/alkenes generally more useful than longer chain ones
Equation for complete combustion of alkanes -ANSWER-
>>>>alkane + oxygen > carbon dioxide + water
Question Paper 2025 AND2026
[VERIFIED]
Relative atomic mass (Ar) -ANSWER->>>>Average mass of an
atom compared with one twelth of the mass of an atom of
carbon 12
Electronegativity -ANSWER->>>>Power of an atom to attract
the pair of electrons in a covalent bond
Standard enthalpy of combustion -ANSWER->>>>Enthalpy
change when 1 mole of a substance burns completely in oxygen
under standard conditions with all reactants and products being
in their standard state
Standard enthalpy of formation -ANSWER->>>>Enthalpy
change when 1 mole of a compound is formed from it's elements
under standard conditions in their standard states
,Mean bond enthalpy -ANSWER->>>>The average energy
needed to break a certain type of bond over a range of
compounds
Activation energy -ANSWER->>>>Minimum energy required
for colliding molecules to react
Maxwell-Boltzmann distribution x and y axes -ANSWER-
>>>>x: Energy
y: fraction/number of molecules
What happens to the Maxwell-Boltzmann curve when
temperature increases -ANSWER->>>>Moves down and to the
right
Rate of reaction -ANSWER->>>>Rate at which product
formed/reactant used up
Order of reaction -ANSWER->>>>Power to which the
concentration of a species is raised in the rate equation
, rearrange k=Ae^-Ea/Rt -ANSWER->>>>lnk=-Ea/Rt+lnA
Conditions for thermal cracking -ANSWER->>>>High
temperature and high pressure
Products of thermal cracking -ANSWER->>>>High % of
alkenes
Conditions for catalytic cracking -ANSWER->>>>High
temperature ,slight pressure and in the presence of a zeolite
catalyst
Products of catalytic cracking -ANSWER->>>>Motor fuels and
aromatic hydrocarbons
Why do we crack alkanes? -ANSWER->>>>Smaller
alkanes/alkenes generally more useful than longer chain ones
Equation for complete combustion of alkanes -ANSWER-
>>>>alkane + oxygen > carbon dioxide + water
