AQA A LEVEL CHEMISTRY PAPER 1 EXAM
QUESTIONS AND CORRECT DETAILED
ANSWERS ALREADY GRADED A
Acceleration (TOF) - correct answer - positive ions
accelerated using electric field so they all have the same
kinetic energy
Activation energy - correct answer - the minimum
energy colliding particles must have in order to react
Adsorption too weak - correct answer - Not many
molecules adsorbed so catalyst has little effect
Analysis (TOF) - correct answer - -computer uses data
to produce mass spectrum which shows mass m / charge
z ratio
-mr or ar is furthest right peak (small peaks larger than
mr are due to isotopes)
-may be large peaks at lower mr due to fragmentation
Atom economy - correct answer - (Molecular mass of
desired products/ Molecular mass of all products) x 100
, Bidentate - correct answer - Forms two coordinate
bonds per ligand
Br- with H2SO4 - correct answer - Produces SO2
S goes from +6 to +4
Test for SO2 if potassium dichromate goes from orange to
green
Bronstead-Lowry base - correct answer - proton
acceptor
Bronsted-Lowry acid - correct answer - proton donor
Buffer - correct answer - A solution that resists changes
in pH when small amounts of acid or base are added.
Cl- with H2SO4 - correct answer - Produces NaHSO4 and
HCl
Not redox as in change in oxidation state because Cl- not
strong enough reducing agent
Test for HCl with ammonia solution, white cloud produced
Complex - correct answer - Central metal ion
surrounded by ligands
QUESTIONS AND CORRECT DETAILED
ANSWERS ALREADY GRADED A
Acceleration (TOF) - correct answer - positive ions
accelerated using electric field so they all have the same
kinetic energy
Activation energy - correct answer - the minimum
energy colliding particles must have in order to react
Adsorption too weak - correct answer - Not many
molecules adsorbed so catalyst has little effect
Analysis (TOF) - correct answer - -computer uses data
to produce mass spectrum which shows mass m / charge
z ratio
-mr or ar is furthest right peak (small peaks larger than
mr are due to isotopes)
-may be large peaks at lower mr due to fragmentation
Atom economy - correct answer - (Molecular mass of
desired products/ Molecular mass of all products) x 100
, Bidentate - correct answer - Forms two coordinate
bonds per ligand
Br- with H2SO4 - correct answer - Produces SO2
S goes from +6 to +4
Test for SO2 if potassium dichromate goes from orange to
green
Bronstead-Lowry base - correct answer - proton
acceptor
Bronsted-Lowry acid - correct answer - proton donor
Buffer - correct answer - A solution that resists changes
in pH when small amounts of acid or base are added.
Cl- with H2SO4 - correct answer - Produces NaHSO4 and
HCl
Not redox as in change in oxidation state because Cl- not
strong enough reducing agent
Test for HCl with ammonia solution, white cloud produced
Complex - correct answer - Central metal ion
surrounded by ligands
