AQA Chemistry for A-level Year 1

and AS Authors: Lyn Nicholls and

Ken Gadd

Your A-level students will need increased maths skills and stronger practical skills to successfully tackle the demands of AS and A-level Chemistry.

Our resources will help you deliver comprehensive support as students build the skills they need. Regular opportunities to consolidate and track progress will build towards confidence in the final examination.

• Supporting you through the changes – the change in assessment structure will bring challenges – our coherent structure of Student Books, Teacher Guides and Skills and Practice resources will help you to understand, plan for and master these challenges

• Assess and progress – from GCSE and across the linear course with varied skills practice integrated throughout the Student Books, Teacher Guides and Skills and Practice resources on Collins Connect

• Prepare for practicals – develop your students’ theoretical understanding with advice and explanations of best practice, plus carry out Required Practicals effectively with full teacher support

• Help prepare students for further study and scientific careers with plenty of stretch and challenge questions that develop higher-order thinking skills

The Student Books have entered the AQA approval process

Teaching A level Chemistry, how the resources support you:

Linear assessment Terminal assessment in the form of three 2 hour papers at A-level and two 1.5 hour papers on the first four topics at AS Level

➜

• Extensive practice questions embedded throughout help build synoptic understanding

• Online resources including video worked examples and downloadable practice papers develop the skills and written techniques that students need for their final assessment

PracticalsAssessment of practical skills will be by written exam only. Practical-based questions will form 15% of the total assessment ➜

• Comprehensive Required Practical sections advise students on apparatus, techniques and how best to avoid common errors

• Detailed support for teachers and technicians in the Teacher Guides

• Practical based assignments and questions integrated throughout the Student Book and Teacher Guides.

Maths20% of assessment marks require the use of Level 2 mathematical skills

➜• Test and build mathematical skills with signposted

Assignments throughout• Video worked examples in the Skills and Practice

resources model mathematical skills

Standalone AS qualificationThe AS becomes a stand-alonequalification, which doesn’tcontribute to the A-level grade

➜• Planning tools in the Teacher Guide and Student

Book content matched to the 2015 specification enable you to easily co-teach AS and year one of A-level

Comprehensive Student SupportThe complete content coverage that your students will need. Help them build knowledge, application and evaluation skills through clear explanations set in real-life contexts, supported by maths and practical skills-focused assignments. Questions are integrated into every chapter to check knowledge, test skills and consolidate learning. Stretch and challenge questions extend students’ understanding, and extensive practice questions help prepare for the final assessment.

In text questions provide opportunities to check understanding and progress, whether learning a topic for the first time or revisiting it as part of revision

Prior knowledge section at the start of each chapter consolidates knowledge from GCSE and gives students a route into the topic

Key ideas summary allows students to check progress easily and revise effectively for examinations

Extensive end of chapter practice questions help prepare for final assessment

Stretch and challenge questions and activities encourage stronger students to move beyond the specification

Signposted assignments throughout build confidence in Maths skills, practical skills, extended writing, AO2 and AO3

Boost understanding and mathematical skills with worked maths examples

Required practicals pages provide comprehensive guidance on apparatus, experimental techniques and how best to avoid common errors

Comprehensive Teacher SupportTeacher Guides help you deliver a linear course confidently with a clear sequence of learning mapped out in medium and long-term plans. The planning tools also enable you to co-teach AS and A-level. A wealth of differentiated activity sheets provide inspiration for fresh ways to develop students’ skills in maths, practicals, analysis and evaluation. These extensive guides also provide support for hands-on practical work with activities, instruction guides and technician notes.

Chapter 2: Amount of substance

A-Level Chemistry Teacher Pack | Page 1 | ©HarperCollinsPublishers Limited 2015

Scheme of work

Chapter 2: Amount of substance CHAPTER PLANNING

16 hours

This chapter includes a substantial amount of practical work including one of the Required practicals. Some of the ideas dealt with resonate with Chapter 1, for example, Relative masses. Some of the lessons for Chapter 2 may be taught in parallel or interspersed with lessons for Chapter 1.

You may wish to use some of the later lessons that are predominately focussed on practical skills and experiments with lessons that are part of other chapters. For example, 2.11 Thermal decomposition could be part of lessons about Group 2 metals, and 2.15 Relative formula mass of succinic acid could be part of lessons about carboxylic acids.

Although Required practical 1: Make up a volumetric solution and carry out a simple acid–base titration is positioned here, there is no reason why suitable practical activities such as 2.15 Relative formula mass of succinic acid should not come later in the course and practical skills to be assessed for endorsement (required for A-level, but not AS) demonstrated then.

ONE HOUR LESSONS SPECIFICATION CONTENT

2.1 Relative masses 3.1.2.1 Relative atomic mass and relative molecular mass Relative atomic mass and relative molecular mass in terms of 12C. The term relative formula mass will be used for ionic compounds. Students should be able to define relative atomic mass (Ar) and relative molecular mass (Mr).

2.2 The mole

2.3 Solutions

2.4 Mole calculations

3.1.2.2 The mole and the Avogadro constant The Avogadro constant as the number of particles in a mole. The mole as applied to electrons, atoms, molecules, ions, formulae and equations. The concentration of a substance in solution measured in mol dm-3. Students should be able to carry out calculations using: • the Avogadro constant • mass of substance, relative molecular mass and amount in moles • concentration, volume and amount of substance in a solution.

Students will not be expected to recall the value of the Avogadro constant. MS 0.1: Students carry out calculations using numbers in standard and ordinary form, e.g. using the Avogadro constant. MS 0.4: Students carry out calculations using the Avogadro constant. MS 1.1: Students report calculations to an appropriate number of significant figures, given raw data quoted to varying numbers of significant figures. Students understand that calculated results can only be reported to the limits of the least accurate measurement.

2.5 Ideal gas equation

2.6 Relative molecular mass of a volatile liquid

3.1.2.3 The ideal gas equation The ideal gas equation pV = nRT with the variables in SI units. Students should be able to use the equation in calculations. They will not be expected to recall the value of the gas constant, R. AT a, b and k PS 3.2: Students could be asked to find the Mr of a volatile liquid. MS 0.0: Students understand that the correct units need to be in pV = nRT MS 2.2, 2.3 and 2.4: Students carry out calculations with the ideal gas equation, including rearranging the ideal gas equation to find unknown quantities.

2.7 Calculating empirical formulae

2.8 Determine the

3.1.2.4 Empirical and molecular formula Empirical formula is the simplest whole number ratio of atoms of each element in a compound. Molecular formula is the actual number of atoms of each element in a

Support progress with a clearly signposted sequence of learning

Chapter 2: Amount of substance

A-Level Chemistry Teacher Pack | Page 15 | ©HarperCollinsPublishers Limited 2015

Activity sheet 2.4.1

Analysing potassium manganate(VII) solution THE INVESTIGATION

Potassium manganate(VII) is an intense purplish black coloured crystalline solid. It dissolves readily in water and the intensity of the colour depends on the concentration of potassium manganate(VII).

You will be given a solution of potassium manganate(VII) of unknown concentration. Your task is to make a series of solutions of potassium manganate(VII) of known concentration and to determine the concentration of the unknown by colour matching.

EQUIPMENT AND MATERIALS

• 8 x 100 cm3 beakers • 1 x 250 cm3 measuring cylinder • 2 x 25 cm3 measuring cylinders • electronic balance (capable of weighing to the nearest 0.01 g or better) • piece of white card or paper • potassium manganate(VII), KMnO4(s) • solution of potassium manganate(VII) of unknown concentration

PROCEDURE

Wear eye protection. Potassium manganate(VII) stains very easily, including skin (the purple stain slowly becomes brown), so wear protective gloves when working with solid potassium manganate(VII) and its solutions.

Prepare a standard solution of potassium manganate(VII)

01. Place a 100 cm3 beaker on the balance pan and zero the balance. Measure 0.2 ±0.1 g potassium manganate(VII) into the beaker and record the mass to the nearest 0.01 g.

02. Add about 20 cm3 of deionised water and swirl the contents to dissolve the potassium manganate(VII).

03. Pour the solution into a 250 cm3 measuring cylinder, using a small funnel. Rinse the beaker using a wash bottle to make sure all the potassium manganate(VII) solution has been washed into the cylinder. Make the solution up to the 250 cm3 graduation mark. This is your standard solution.

Colour matching analysis

01. Label six 100 cm3 beakers A to F. Use the two measuring cylinders (one for the standard potassium manganate(VII) solution and the other for deionised water) to measure these volumes into the beakers:

Beaker A B C D E F

Volume of standard solution of potassium manganate(VII) 20 16 12 8 4 0

Volume of water 0 4 8 12 16 20

Concentration of potassium manganate(VII) / g dm-3

Measure the volumes as carefully as you can. Use dropper pipettes (one for the standard potassium manganate(VII) solution and the other for deionised water) to make the final additions to the measuring cylinders.

02. Stand the beakers in a line on a white background, such as a sheet of white card or paper.

03. Measure 20 cm3 of solution of potassium manganate(VII)) of unknown concentration into a 100 cm3 beaker.

04. Compare the unknown with the solutions you prepared by dilution of the standard potassium manganate(VII) solution. Find which solution its colour most closely matches. Estimate the concentration of potassium manganate(VII) in the unknown.

DATA ANALYSIS

Calculate the concentration of the potassium manganate(VII) standard solution in g dm-3.

Calculate the concentrations in solutions A-E, also in g dm-3.

Estimate the concentration of potassium manganate(VII) in the unknown solution.

Find inspiration for fresh ways to develop students’ skills in maths, practicals, analysis and evaluation with a wealth of differentiated Activity Sheets

AQA A-level Chemistry Student Book 1 9780007590216 Summer 2015 £24.99

AQA A-level Chemistry Student Book 2 9780007597635 January 2016 £24.99

AQA A-level Chemistry Teacher Guide 1 9780008114244 September 2015 £150.00

AQA A-level Chemistry Teacher Guide 2 9780008114251 January 2016 £150.00

AQA A-level Chemistry Year 1 and AS Skills and Practice resources

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Updated series information, samples and digital previews of Collins Connect will also be available on the A-level Chemistry homepage at www.collins.co.uk/AQAALevelChemistry.

Online Skills and Practice Resources on Collins ConnectDevelop your students’ proficiency in key skills, using our engaging subscription resources with an emphasis on maths, written communication, AO2 and AO3. Video worked examples focused on maths, interactive example answers and a wealth of downloadable practice question papers will help your students develop and practise skills and prepare for exams.

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