Eduqas Chemistry for A Level Year 2: Student Bk

6 Eduqas A Level Chemistry Year 2 Suggested practical exercises There are many opportunities for practical work during the second year and the specification mentions some that should be done. These are Topic PI1.1 Construction of electrochemical cells and measurement of E cell Topic PI1.2 Simple redox titration Estimation of copper in copper(II) salts Topic PI3 Determination of the order of a reaction, for example, the oxidation of iodide ions by hydrogen peroxide in acid solution Topic PI5.1 Determination of an equilibrium constant, for example, for the equilibrium established when ethanol reacts with ethanoic acid Topic PI5.2 Titration using a pH probe, for example, titration of a weak acid against a weak base Topic OA2.2 Identification of aldehydes/ketones by their reaction with 2,4-dinitrophenylhydrazine Topic OA4 Synthesis of a liquid organic product, including separation using a separating funnel Synthesis of a solid organic product, including recrystallisation and determination of melting temperature Two-step organic synthesis, including purification and determination of melting temperature of product Planning a sequence of tests to identify organic compounds from a given list Paper chromatography separation, including two-way separation The examinations As well as being able to recall facts, name structures and describe their functions, you also need to appreciate the underlying principles of the subject and understand associated concepts and ideas. In other words, you need to develop skills so that you can apply what you have learned, perhaps to situations not previously encountered. For example, the inter- conversion of numerical data and graph form; the analysis and evaluation of numerical data or written information; the interpretation of data; and the explanation of experimental results. You will be expected to answer different styles of question, in each paper, for example: Section A Short answer questions – these often require a one-word answer or are a simple calculation. Section B Structured questions may be in several parts usually about a common theme. They become more difficult as you work your way through. Structured questions can be short, requiring a one-word response, or may include the opportunity for extended writing. The number of lined spaces and the mark allocation at the end of each part question are there to help you. They indicate the length of answer expected. If three marks are allocated then you must give three separate points. In each of the papers for components 1 and 2 there will be TWO longer six-mark question that will be assessed using a banded level of response mark scheme. What is required is a piece of writing that answers the question directly using well- constructed sentences and suitable chemical terminology. Often candidates rush into such questions. You should take time to read it carefully to discover exactly what the examiner requires in the answer, and then construct a plan. This will not only help you organise your thoughts logically but will also give you a checklist to which you can refer when writing your answer. In this way you will be less likely to repeat yourself, wander off the subject or omit important points. Further notes on the papers There will be no multiple choice questions. A maximum of 10% will rely on recall only, i.e. no understanding. A minimum of 15% will be related to practical work and a minimum of 20% to Level 2/3 mathematical skills.