9701/42

Chemistry 9701/42October/November 2016

Cambridge A-Level · A Level Structured Questions · worked solutions for every part, with the mark scheme

8
questions
100
marks
120
minutes

Topics Transition Elements · Chemical Energetics · Equilibria · Introduction to A Level Organic Chemistry · Reaction Kinetics · Organic Synthesis · +5 more

Q1Transition ElementsFree sample

Transition elements are important metals because of their characteristic properties.

(a)

Define what is meant by a transition element.

1M
(b)
(i)

For each of the following complexes, state the co-ordination number and the oxidation number of the transition element present.

co-ordination numberoxidation number
[Ni(CN)2(NH3)2][\text{Ni}(\text{CN})_2(\text{NH}_3)_2]
[CrCl2(H2O)4]+[\text{CrCl}_2(\text{H}_2\text{O})_4]^+
2M
(ii)

State the type of bonding that exists between the ligand and the metal ion in these complexes.

1M
(iii)

Suggest the structure of [Ni(CN)2(NH3)2][\text{Ni}(\text{CN})_2(\text{NH}_3)_2] and name its shape.

name of shape ....................................................................................................................

2M
(c)

The complex ion [Cr(H2O)6]3+[\text{Cr}(\text{H}_2\text{O})_6]^{3+} can be converted into [CrCl2(H2O)4]+.[\text{CrCl}_2(\text{H}_2\text{O})_4]^+.

(i)

Suggest a suitable reagent for this conversion.

1M
(ii)

State the type of reaction in (i).

1M
(d)

The [CrCl2(H2O)4]+[\text{CrCl}_2(\text{H}_2\text{O})_4]^+ complex ion shows stereoisomerism.

(i)

Name this type of stereoisomerism.

1M
(ii)

Draw three-dimensional diagrams to show the two stereoisomers of [CrCl2(H2O)4]+.[\text{CrCl}_2(\text{H}_2\text{O})_4]^+.

3M

The rest of this paper

7 more questions
  • Q2Chemical Energetics11M
  • Q3Transition Elements · Reaction Kinetics · Chemical Energetics13M
  • Q4Transition Elements9M
  • Q5Equilibria10M
  • Q6Introduction to A Level Organic Chemistry · Equilibria · Organic Synthesis · Hydroxy Compounds12M
  • Q7Hydrocarbons · Nitrogen Compounds · Carboxylic Acids and Derivatives20M
  • Q8Introduction to A Level Organic Chemistry · Analytical Techniques13M
Loading the full paper…