AQA a level chemistry paper 1
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1. What is the general equa- 1. [M(H2O)6]3+ + 3NH3 -> [M(H2O)3(OH)3] + 3NH4+
tion for the reaction of 2. Fe(III) - orange/brown ppt
[M(H2O)6]3+ with NH3? (1) 3. Al(III) - white ppt
Give the observations seen
of the iron and aluminium
complexes (2)
2. Define the term enthalpy of 1. enthalpy change when one mole of ionic lattice
lattice formation (2) 2. is formed from its gaseous ions
3. Identify a reagent that 1. AgNO3
could be used to indicate 2. yellow ppt
the presence of iodide ions
in an aqueous solution and
describe the observation
made (2)
4. Suggest why pure water at 1. [H+]=[OH-]
10 degrees (pH>7) is not al-
kaline (1)
5. State the term of the mean- 1. a central metal ion surrounded by ligands
ing transition metal com-
plex (1)
6. Draw the shape of a trigonal pyramidal
PF3 molecule, include lone
pairs (1)
Name the shape (1)
, AQA a level chemistry paper 1
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7. Suggest why the oxidation 1. PF3 has no overall charge and the complex has no overall charge
state of chromium is zero in
Cr(PF3)6 (1)
8. Deduce the oxidation state 1. +2
of chromium in the
[Cr(NH3)4Cl2] (1)
9. Name the type of bond be- 1. covalent bond
tween N and H in ammonia
(1)
10. Draw the two isomers of cis/trans isomerism
[Cr(NH3)4Cl2]+ (2)
State the isomerism shown
(1)
11. Complete the equation to 1. [Cr(H2O)5Cl]Cl2
show the formation of
one complex that contains
chromium in its +3 oxida-
tion state (1)
CrCl3 + 5H2O ->
12. Give the electron configura- 1. 1s2, 2s2, 2p6
tion of the Al3+ ion (1)
13. Give the equation for the 1. Al2(SO4)3 + 12H2O -> 2[Al(H2O)6]3+ + 3SO42-
reaction between Al2(SO4)3
and water forming a so-
, AQA a level chemistry paper 1
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lution containing the com-
plex ion [Al(H2O)6]3+ (1)
14. Explain why the solution 1. Al3+ has a high charge and small size/high charge density
containing [Al(H2O)6]3+ is 2.AL3+ weakens the O-H bond in water ligand and donates H+ to
acidic (2) water
15. State why the concentra- 1. its a colourless solution
tion of aluminium sulfate
solution can't be deter-
mined by colorimetry (1)
16. Give the ionic equa- 1. [Al(H2O)6]3+ + 3NH3 -> [Al(H2O)3(OH)3] + 3NH4+
tion for the reaction of 2. white ppt
[Al(H2O)6]3+ with excess
aqueous ammonia (1)
State one observation (1)
17. State the meaning of the 1. electrode potentials in numerical order
term electrochemical series
(1)
18. State the equations which 1. cathode: Li+ + CoO2 + e- -> LiCoO2
go on at the positive elec- 2. anode: Li+ + e- -> Li
trode (cathode) and nega- 3. overall equation: CoO2 + Li ’LiCoO2 (for charging, the equation
tive electrode (anode) for a is the other way around)
lithium ion cell (2) 4. cell EMF: +0.6 - -3.00 = 3.6 V
Deduce the overall equa-
tion of the reaction (1)
State the cell EMF (1)
19. State the equations which 1. cathode: O2 + 2 H2O + 4 e- -> 4 OH-
go on at the positive elec- 2. anode: H2 + 2OH- -> 2H2O + 2e-
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1. What is the general equa- 1. [M(H2O)6]3+ + 3NH3 -> [M(H2O)3(OH)3] + 3NH4+
tion for the reaction of 2. Fe(III) - orange/brown ppt
[M(H2O)6]3+ with NH3? (1) 3. Al(III) - white ppt
Give the observations seen
of the iron and aluminium
complexes (2)
2. Define the term enthalpy of 1. enthalpy change when one mole of ionic lattice
lattice formation (2) 2. is formed from its gaseous ions
3. Identify a reagent that 1. AgNO3
could be used to indicate 2. yellow ppt
the presence of iodide ions
in an aqueous solution and
describe the observation
made (2)
4. Suggest why pure water at 1. [H+]=[OH-]
10 degrees (pH>7) is not al-
kaline (1)
5. State the term of the mean- 1. a central metal ion surrounded by ligands
ing transition metal com-
plex (1)
6. Draw the shape of a trigonal pyramidal
PF3 molecule, include lone
pairs (1)
Name the shape (1)
, AQA a level chemistry paper 1
Study online at https://quizlet.com/_f6ppu7
7. Suggest why the oxidation 1. PF3 has no overall charge and the complex has no overall charge
state of chromium is zero in
Cr(PF3)6 (1)
8. Deduce the oxidation state 1. +2
of chromium in the
[Cr(NH3)4Cl2] (1)
9. Name the type of bond be- 1. covalent bond
tween N and H in ammonia
(1)
10. Draw the two isomers of cis/trans isomerism
[Cr(NH3)4Cl2]+ (2)
State the isomerism shown
(1)
11. Complete the equation to 1. [Cr(H2O)5Cl]Cl2
show the formation of
one complex that contains
chromium in its +3 oxida-
tion state (1)
CrCl3 + 5H2O ->
12. Give the electron configura- 1. 1s2, 2s2, 2p6
tion of the Al3+ ion (1)
13. Give the equation for the 1. Al2(SO4)3 + 12H2O -> 2[Al(H2O)6]3+ + 3SO42-
reaction between Al2(SO4)3
and water forming a so-
, AQA a level chemistry paper 1
Study online at https://quizlet.com/_f6ppu7
lution containing the com-
plex ion [Al(H2O)6]3+ (1)
14. Explain why the solution 1. Al3+ has a high charge and small size/high charge density
containing [Al(H2O)6]3+ is 2.AL3+ weakens the O-H bond in water ligand and donates H+ to
acidic (2) water
15. State why the concentra- 1. its a colourless solution
tion of aluminium sulfate
solution can't be deter-
mined by colorimetry (1)
16. Give the ionic equa- 1. [Al(H2O)6]3+ + 3NH3 -> [Al(H2O)3(OH)3] + 3NH4+
tion for the reaction of 2. white ppt
[Al(H2O)6]3+ with excess
aqueous ammonia (1)
State one observation (1)
17. State the meaning of the 1. electrode potentials in numerical order
term electrochemical series
(1)
18. State the equations which 1. cathode: Li+ + CoO2 + e- -> LiCoO2
go on at the positive elec- 2. anode: Li+ + e- -> Li
trode (cathode) and nega- 3. overall equation: CoO2 + Li ’LiCoO2 (for charging, the equation
tive electrode (anode) for a is the other way around)
lithium ion cell (2) 4. cell EMF: +0.6 - -3.00 = 3.6 V
Deduce the overall equa-
tion of the reaction (1)
State the cell EMF (1)
19. State the equations which 1. cathode: O2 + 2 H2O + 4 e- -> 4 OH-
go on at the positive elec- 2. anode: H2 + 2OH- -> 2H2O + 2e-
