AQA A-level Chemistry paper 2
Study online at https://quizlet.com/_gbyfva
1. Relative atomic mass (Ar) Average mass of an atom
compared with one twelth
of the mass of an atom of
carbon 12
2. Electronegativity Power of an atom to attract
the pair of electrons in a
covalent bond
3. Standard enthalpy of combustion Enthalpy change when 1
mole of a substance burns
completely in oxygen un-
der standard conditions
with all reactants and
products being in their
standard state
4. Standard enthalpy of formation Enthalpy change when 1
mole of a compound is
formed from it's elements
under standard condi-
tions in their standard
states
5. Mean bond enthalpy The average energy need-
ed to break a certain type
of bond over a range of
compounds
6. Activation energy Minimum energy re-
quired for colliding mole-
cules to react
, AQA A-level Chemistry paper 2
Study online at https://quizlet.com/_gbyfva
7. Maxwell-Boltzmann distribution x and y axes x: Energy
y: fraction/number of
molecules
8. What happens to the Maxwell-Boltzmann curve when Moves down and to the
temperature increases right
9. Rate of reaction Rate at which product
formed/reactant used up
10. Order of reaction Power to which the con-
centration of a species is
raised in the rate equation
11. rearrange k=Ae^-Ea/Rt lnk=-Ea/Rt+lnA
12. Conditions for thermal cracking High temperature and
high pressure
13. Products of thermal cracking High % of alkenes
14. Conditions for catalytic cracking High temperature ,slight
pressure and in the pres-
ence of a zeolite catalyst
15. Products of catalytic cracking Motor fuels and aromatic
hydrocarbons
16. Why do we crack alkanes? Smaller alkanes/alkenes
generally more useful
than longer chain ones
17. Equation for complete combustion of alkanes alkane + oxygen > carbon
dioxide + water
Study online at https://quizlet.com/_gbyfva
1. Relative atomic mass (Ar) Average mass of an atom
compared with one twelth
of the mass of an atom of
carbon 12
2. Electronegativity Power of an atom to attract
the pair of electrons in a
covalent bond
3. Standard enthalpy of combustion Enthalpy change when 1
mole of a substance burns
completely in oxygen un-
der standard conditions
with all reactants and
products being in their
standard state
4. Standard enthalpy of formation Enthalpy change when 1
mole of a compound is
formed from it's elements
under standard condi-
tions in their standard
states
5. Mean bond enthalpy The average energy need-
ed to break a certain type
of bond over a range of
compounds
6. Activation energy Minimum energy re-
quired for colliding mole-
cules to react
, AQA A-level Chemistry paper 2
Study online at https://quizlet.com/_gbyfva
7. Maxwell-Boltzmann distribution x and y axes x: Energy
y: fraction/number of
molecules
8. What happens to the Maxwell-Boltzmann curve when Moves down and to the
temperature increases right
9. Rate of reaction Rate at which product
formed/reactant used up
10. Order of reaction Power to which the con-
centration of a species is
raised in the rate equation
11. rearrange k=Ae^-Ea/Rt lnk=-Ea/Rt+lnA
12. Conditions for thermal cracking High temperature and
high pressure
13. Products of thermal cracking High % of alkenes
14. Conditions for catalytic cracking High temperature ,slight
pressure and in the pres-
ence of a zeolite catalyst
15. Products of catalytic cracking Motor fuels and aromatic
hydrocarbons
16. Why do we crack alkanes? Smaller alkanes/alkenes
generally more useful
than longer chain ones
17. Equation for complete combustion of alkanes alkane + oxygen > carbon
dioxide + water
