All Johnstone's model articles

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Moles of gold | Johnstone’s triangle worksheets | 14–16 years

Connect macroscopic, sub-microscopic and symbolic understanding of calculations involving moles and mass with Johnstone’s triangle

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Iron and sulfur reaction | Johnstone’s triangle | 11–14

Develop your learners’ understanding of reactants and products at different conceptual levels, using an iron and sulfur reaction as an example

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Balancing chemical equations using hydrogen and oxygen | Johnstone’s triangle worksheets | 14–16 years

Introduce Johnstone’s triangle to help learners gain a deeper understanding of balancing chemical equations

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Relative atomic mass of boron | Johnstone’s triangle worksheets | 14–16 years

Use Johnstone’s triangle to help learners think about the relative atomic mass of boron 

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Concentration of sodium hydroxide | Johnstone’s triangle worksheets | 14–16 years

Think about sodium hydroxide (NaOH) solution at a macroscopic, sub-microscopic and symbolic level

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Extracting tin from tin oxide | Johnstone’s triangle worksheets | 14–16 years

Introduce calculations using reacting masses in the context of extracting tin from tin oxide 

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Diffusion and chemical reactions | Developing understanding | 11–14 years

Use this worksheet to deepen understanding of diffusion and chemical reactions and how these processes are represented 

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Diffusion and dissolving | Developing understanding | 11–14 years

Deepen learners’ understanding of diffusion and dissolving with this worksheet exploring different conceptual levels of thinking

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Diffusion of colour in water | Johnstone’s triangle worksheets | 11–14 years

Use this worksheet to develop learners’ understanding of diffusion as they observe coloured dyes diffusing in water

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Melting and boiling | Johnstone’s triangle worksheets | 11–14 years

Develop learners’ understanding of melting and boiling with this worksheet, including a teacher demonstration for learners to observe

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Melting and boiling points | Developing understanding | 11–14 years

Deepen understanding of melting and boiling points and how these are represented at different conceptual levels of thinking

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Dissolving salt | Johnstone’s triangle worksheets | 11–14 years

Use this worksheet to develop learners’ understanding of solutions as they observe how salt and sand behave in water

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Solutions | Developing understanding | 11–14 years

Encourage learners to deepen their understanding of solutions and how they are represented at different conceptual levels of thinking

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States of matter | Developing understanding | 11–14 years

Encourage learners to deepen their understanding of states of matter and how they are represented at different conceptual levels of thinking

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States of matter | Johnstone’s triangle worksheets | 11–14 years

Use this worksheet to develop learners’ understanding of states of matter, including a teacher demonstration

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Isotopes of hydrogen | Johnstone’s triangle | 14–16 years

Use this worksheet to develop learners’ understanding of atoms and isotopes by considering ‘heavy water’ ice cubes

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Atoms and isotopes | Developing understanding | 14–16 years

Encourage learners to deepen their understanding of isotopes from the macroscopic to sub-microscopic level

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Atoms and ions | Developing understanding | 14–16 years

Encourage learners to think about how atoms and ions are represented and what this means at the sub-microscopic level

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Atoms and ions of copper | Johnstone’s triangle worksheets | 14–16 years

Use these worksheets to develop learners’ understanding of atoms and ions, including a demonstration of a metal displacement reaction

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Atomic structure of lithium | Johnstone’s triangle worksheets | 14–16 years

Use these worksheets to develop learners’ understanding of atomic structure, using the example of lithium