Chemical Formulae
AQA A-Level Chemistry
3.3.1
Organic chemistry involves working with molecules that can be represented in several different ways, each highlighting different aspects of their structure. Building on your existing understanding of chemical formulae, we can now explore the different representations used for organic compounds and how they help us communicate molecular structure. This provides the foundation for understanding homologous series, functional groups and nomenclature in the topics that follow.
In this topic you will:
- Understand why different chemical formulae are used in organic chemistry.
- Distinguish between molecular, empirical and general formulae.
- Construct and interpret structural and displayed formulae.
- Construct and interpret skeletal formulae.
- Convert between different representations of organic compounds.
Learn, Revise, Practise
Whether you’re learning this topic for the first time or revising before an exam, the Learn, Revise, Practise Method helps you study in the right way at the right time.
If you’re studying this topic for the first time, or you’re struggling to understand it, start with Learn. Once you’ve built that understanding, move on to Revise to strengthen your memory, before finishing with Practise to apply your knowledge to exam-style questions.
Learn
Build understanding
Watch the lesson and complete the Learn Pack as you go to develop a secure understanding of the topic.
Revise
Strengthen memory
Use active recall to check what you can remember, identify gaps and reinforce your understanding.
Practise
Apply knowledge
Work through exam-style questions and develop the confidence and technique needed for success.
Learn
Build Understanding
Start by building a secure understanding of the topic’s content. Download the Learn Pack and complete the guided activities alongside the video. This will help build your understanding and give you a comprehensive set of notes to refer back to. Once you’ve finished the video, use the questions in the pack to check your understanding. Finally, use the answers to review your work and correct any misunderstandings before moving on to the Revise phase.
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