Use Johnstone’s triangle to calculate the number of moles of xenon in a given volume of gas
With this resource, learners identify how to convert units of measurement to use in mole calculations. They then use this information to help them suggest how pressure affects the number of atoms.
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Use this student worksheet to introduce calculating the moles of xenon and link to learners' understanding at three different conceptual levels.
View and download more Johnstone's triangle worksheets
Learning objectives
- Convert from cm3 to dm3.
- Calculate the number of moles of xenon in a given volume of gas at standard temperature and pressure.
- Suggest how the number of atoms differs at a higher pressure.
How to use Johnstone’s triangle
Use Johnstone’s triangle to develop learners’ thinking about scientific concepts at three different conceptual levels:
- Macroscopic: what we can see. Think about the properties that we can observe, measure and record.
- Sub-microscopic: smaller than we can see. Think about the particle or atomic level.
- Symbolic representations: Think about how we represent chemical ideas including symbols and diagrams.
For learners to gain a deeper awareness of a topic, they need to understand it at all three levels.
When introducing a topic, do not try to introduce all of the levels of thinking at once. This will overload working memory. Instead complete the triangle over a series of lessons, beginning with the macroscopic level and introducing other levels, in turn, once secure.
All of the levels are interrelated, for example, learners need visual representation of the sub-microscopic in order to develop mental models of the particle or atomic level.
Further reading
Read more about how to use Johnstone’s triangle in your teaching with these articles:
- Develop deeper understanding with models
- Improve students’ understanding with Johnstone’s triangle
- Practical ideas for using Johnstone’s triangle
Norman Reid’s book The Johnstone triangle: the key to understanding chemistry provides a more in-depth overview, the first chapter is available to read online.
Scaffolding
Share the structure of the triangle with learners prior to use. Tell them why you are using it and how it will help them to develop their understanding. Use an ‘I try, we try, you try’ approach when introducing Johnstone’s triangle for the first time.
More resources
To further develop learner’s thinking in all areas of Johnstone’s triangle, try our Developing understanding of moles and volume worksheet. This includes icons in the margin referring to the conceptual level of thinking needed to answer the question.
Downloads
Moles of xenon Johnstone's triangle student sheet
Handout | PDF, Size 0.23 mbMoles of xenon Johnstone's triangle teacher notes and answers
Handout | PDF, Size 0.25 mbMoles of xenon Johnstone's triangle student sheet
Editable handout | Word, Size 0.6 mbMoles of xenon Johnstone's triangle teacher notes and answers
Editable handout | Word, Size 0.6 mb
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