8/3/2019 Chemistry Unit 6B Strategy

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6A Laborarory

Laboratory chemistry II

• The specification (syllabus) for the tests on this module includes all the

AS and A2 material.

The Unit Test6B

is a synoptic paper, taken by all candidates, an d willalso assess the candidate's quality of written communication.

Unit Test 6A: Assessment ofpracticalskills II

o This is either internally assessed or a practical exam.

Notes and books may be used in the tests.

Ll The practical exam will be broadly qualitative in its approach.

You should be able to:

i observe and interpret details of the chemistry of the elements and

compounds listed in Units 4 and S.

i i recognize the results of experiments to identify functional groups in

organic compounds.

iii carry out the techniques described in Topic 5.5 and those used in

volumetric analysis, kinetics and equilibria.

iv present and interpret quantitative and qualitative results.

v devise and plan simple experiments based on the chemistry and

techniques as above.

Unit Test 6B

All candidates will do this paper

The Unit Test question (exam) paper

• Section A will consist of a compulsory question and will assess a

candidate's ability to interpret data from laboratory situations.

Section B will consist of three questions and the candidate must

answer two of the three questions.

These questions will require candidates to make connections between

different areas of chemistry, for example by applying knowledge and

understanding of principles to situations in contexts new to them.

8/3/2019 Chemistry Unit 6B Strategy

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118• ADVANCED LABORATORY CHEMISTRY

Questions will be set on any of the topics in the AS and A2

specification.

The questions will require much less factual recall than those in earlier

unit tests. Much more emphasis will be placed upon application of

knowledge

• Questions will test a candidate's ability to analyse information from

several different areas of the specification.

The words 'suggest' and 'deduce' will occur more often in questions

than 'state' or 'recall'.

Tackling the paper

Spend some time looking through Section B and decide which questions

you are going to attempt. Read all of the question before rejecting it.

You may be able to answer all but the first part and so still score good

marks. I f you are getting nowhere in a question, abandon it and try

another, bu t do not cross out what you have written, because you

might score more for it than for the other question. The examiner will

count your better mark.Do not be pu t off by unusual compounds or situations. In these

questions you are no t expected to know the answer, but to be able to

work it out, using your knowledge and understanding of similar

compounds or situations.

Synoptic questions will contain material from several topics. This is

done by using the links that exist between different branches of

chemistry.

Each question should have a thread or link connecting the different

parts. Identification of this thread will help you to focus on the relevant

chemistry. So do not treat each part of a question in isolation from the

other parts of it.

For example in the questions in the Unit Test 6B on pages 119 and 120.

Question 2 is based on organic and inorganic nitrogen compounds,

with questions on fertilisers, pKa polymers, amine preparation, and

Kp or ammonium nitrate linked to thermodynamic and kinetic

stability.

• Question 3 is a reaction scheme where the carbon chain is increasedleading to a carboxylic acid, then a pH and buffer question about that

acid.

• Question 4 is about the chemistry of iron, linking bonding, transitionmental properties, Br0nsted-Lowry pairs, tests for Fe

3+ and redox

titrations.

To do well in this paper you must revise the entire specification(syllabus) and especially Topic 1.2. Do no t become pu t off by this load

as many of the Topics in A2 are extensions of those in AS. For example:

Topic 4.1 with 2.1 - Energetics

Topic 4.2 with 1.4, 1.6 and 1.7 - The Periodic Table

• Topic 4.3 and 4.4 with 2.4 and 2.5 - Equilibrium

• Topic 4.5, 5.3 and 5.5 with 2.2 - Organic chemistry

• Topic 5.1 with 1.5 - Redox

Topic 5.4 with 2.3 - Kinetics

This leaves Topics 1.1 (Atomic structure), 1.2 (Formulae, equations and moles)

and 1.3 (Structureand

bonding) all of which are fundamental to chemistryand

much of these topics will have been revised by your teacher during the A2 year