1.
State what is meant by periodicity.
[1 mark]
- repeating trends across a period
JD SCIENCE
Inorganic chemistry
Indicative marking points. Award marks for equivalent scientific or mathematical wording. Do not issue this sheet with the student worksheet.
2.
State what is meant by first ionisation energy.
[1 mark]
- energy to remove 1 mol of electrons from 1 mol of gaseous atoms
3.
State what is meant by Group 2.
[1 mark]
- alkaline earth metals
4.
State what is meant by Group 7.
[1 mark]
- halogens
5.
State what is meant by a transition metal.
[1 mark]
- forms at least one ion with an incomplete d-subshell
6.
State what is meant by a complex ion.
[1 mark]
- central metal ion with ligands
7.
State what is meant by a ligand.
[1 mark]
- a lone-pair donor
8.
State what is meant by heterogeneous catalyst.
[1 mark]
- different phase from reactants
9.
State what is meant by homogeneous catalyst.
[1 mark]
- same phase
10.
State what is meant by amphoteric.
[1 mark]
- reacts with acids and bases
11.
Devon is asked about periodicity in a Edexcel Chemistry paper.
(a) [2 marks]
- atomic radius, ionisation energy, melting point
(b) [3 marks]
- explained by structure and shielding
12.
Devon is asked about first ionisation energy in a Edexcel Chemistry paper.
(a) [2 marks]
- generally increases across a period
(b) [3 marks]
- falls at Group 3 and 6
13.
Devon is asked about Group 2 in a Edexcel Chemistry paper.
(a) [2 marks]
- reactivity increases down the group
(b) [3 marks]
- hydroxides more soluble, sulfates less soluble down the group
14.
Devon is asked about Group 7 in a Edexcel Chemistry paper.
(a) [2 marks]
- oxidising power decreases down the group
(b) [3 marks]
- displacement reactions
15.
Devon is asked about a transition metal in a Edexcel Chemistry paper.
(a) [2 marks]
- variable oxidation states, coloured ions, catalysts, complexes
(b) [3 marks]
- d–d transitions
16.
Devon is asked about a complex ion in a Edexcel Chemistry paper.
(a) [2 marks]
- coordinate bonds
(b) [3 marks]
- e.g. [Cu(H₂O)₆]²⁺
17.
Electron configuration of Fe (Z=26)
[3 marks]
- Final answer: [Ar] 4s² 3d⁶
18.
Oxidation state of Fe in Fe₂O₃
[3 marks]
- Final answer: +3
19.
Cl₂ + 2KBr →
[3 marks]
- Final answer: 2KCl + Br₂
20.
Moles of Ca(OH)₂ from 0.10 mol Ca
[3 marks]
- Final answer: 0.10 mol
21.
A complex is octahedral. Bond angle
[3 marks]
- Final answer: 90°
22.
Percentage of Ca in CaCO₃
[3 marks]
- Final answer: 40%
23.
Devon carries out a Edexcel-style required practical linked to inorganic chemistry. This is a typical Edexcel required-practical style question.
(a) [2 marks]
- Independent: the independent variable for this topic
- Dependent: the measured outcome
(b) [2 marks]
- keep all other variables constant
- so the test is fair / only one variable is changed
(c) [2 marks]
- repeat and calculate a mean / use a tighter method
24.
Devon carries out collecting valid data for inorganic chemistry. This is a typical Edexcel required-practical style question.
(a) [2 marks]
- Independent: a chosen factor
- Dependent: a quantitative measurement
(b) [2 marks]
- calibrated instrument
- so the test is fair / only one variable is changed
(c) [2 marks]
- systematic error from zero error
25.
Devon carries out drawing a graph for inorganic chemistry. This is a typical Edexcel required-practical style question.
(a) [2 marks]
- Independent: x-variable
- Dependent: y-variable
(b) [2 marks]
- same scale / same apparatus
- so the test is fair / only one variable is changed
(c) [2 marks]
- not drawing a line of best fit through the trend
26.
Devon carries out evaluating a method about inorganic chemistry. This is a typical Edexcel required-practical style question.
(a) [2 marks]
- Independent: method change
- Dependent: precision / accuracy
(b) [2 marks]
- same sample size
- so the test is fair / only one variable is changed
(c) [2 marks]
- too few repeats
27.
Compare periodicity with first ionisation energy.
[4 marks]
- repeating trends across a period
- energy to remove 1 mol of electrons from 1 mol of gaseous atoms
- give one linked difference
28.
Compare first ionisation energy with Group 2.
[4 marks]
- energy to remove 1 mol of electrons from 1 mol of gaseous atoms
- alkaline earth metals
- give one linked difference
29.
Compare Group 2 with Group 7.
[4 marks]
- alkaline earth metals
- halogens
- give one linked difference
30.
Compare Group 7 with a transition metal.
[4 marks]
- halogens
- forms at least one ion with an incomplete d-subshell
- give one linked difference
31.
Apply your knowledge of a ligand to this situation: monodentate or bidentate
[3 marks]
- monodentate or bidentate
32.
Apply your knowledge of heterogeneous catalyst to this situation: surface adsorption
[3 marks]
- surface adsorption