Combined Science to AS/A Level Chemistry: Bridging the Gap


Students that have studied triple science at GCSE have been introduced to some of the key concepts underpinning  quantitative chemistry, giving them a distinct advantage when these topics are revisited and developed at A Level. This workshops gives combined science students the opportunity to be introduced to some of the more challenging of these concepts, and provides resources for them to develop their knowledge and understanding prior to embarking upon their A Level studies.

Structure of the Day

The workshop is delivered across four sessions, with breaks for refreshments and lunch in between. The sessions cover concepts such as stoichiometry, yields, atom economy, moles in solutions, volumes of gases and titrations. The final sessions brings together all of the content, demonstrating how exam questions can link topics to raise challenge.

A detailed break down of the day and the topics covered in each session is given below. If you have any queries please don't hesitate to contact us.

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CPD Suite

Central Teaching Laboratories

University of Liverpool



Timings of the Day

 9.30am –Registration and welcome


10 am – Session 1: Equations, stoichiometry, yields and atom economy


11.15 am – Break


11.30 am – Session 2:  Moles in solutions, moles of gases and Avogadro's number


12.45 pm – Lunch break


1.15 pm – 2.30 pm – Session 3: Titration


2.30 pm – Break


2.45 pm - 4 pm – Session 4: Linking concepts in context

Session Details

Session 1

The first session starts with ensuring students are comfortable building molecular formulae, writing symbol equations and balancing the equations. It then moves on to stoichiometry (molar ratios) in equations, and how they can be used to determine reacting masses using the moles=mass/Mr equation. This session concludes by introducing percentage yield and atom economy, and giving students the chance to practise the skills they have learnt.

Session 2

The second session introduces three new key concepts - the link between moles, concentration and volume in solutions, moles of gases and Avogadro's number. Students will practise using the equations learnt, including ensuring units are converted where appropriate and rearranging the formulae. The three key equations learnt in this session are featured extensively in the A Level syllabi.

Session 3

The third session focuses solely on titration - introducing both the method and calculations. This topic incorporates some of the concepts covered in sessions 2, giving students the opportunity to develop the knowledge they learnt in that session. Students who grasp the concept quickly will be given the opportunity to extend their knowledge to back titrations.

Session 4

The final session brings together all of the concepts covered, and aims to help students see the links between each topic. Students will be challenged by a range of activities that require them to use knowledge from across the range of topics they have covered throughout the day.