Chemical Formulae
AQA A-Level Chemistry
3.3.1
This topic introduces the different ways organic chemists represent compounds, including molecular, empirical, general, structural, displayed and skeletal formulae. Understanding these representations is essential for communicating molecular structures, identifying functional groups and writing organic reaction equations throughout the rest of the course.
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.
Begin with the Learn section if this is your first time covering the topic. If you are revising, move to Revise. If you are testing yourself, go straight to Practise.
Learn
Gain a complete understanding
Learn the core concepts and build a solid understanding.
What to do:
- Watch the video from start to finish.
- Focus on understanding key concepts.
- Complete the Learn Pack alongside the video.
Revise
Check understanding and build recall
Reinforce your knowledge by testing your recall regularly.
What to do:
- Use the flashcards (Leitner system).
- Do brain dumps to test your recall.
- Watch the video (coming soon) to check and fix gaps.
Practise
Apply knowledge in exam questions
Practise exam style questions and develop exam technique
What to do:
- Attempt the questions first (no notes!).
- Watch the video walkthrough (coming soon).
- Check your answers and learn from any mistakes.
Where does this fit?
This lesson is part of the Introduction to Organic Chemistry topic in Organic Chemistry.