| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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Students should be able to recognise/draw simple diagrams to model the difference between solids, liquids and gases. |
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Draw a diagram pf particle arrangement for a solid; a liquid and a gas. |
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The particle model can be used to explain
? the different states of matter
? differences in density. |
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What two things can the particle model be used to explain? density bottle containing salt water, isopropyl and beads of different density. set up as:
bottom layer - salt water
beads in centre
isopropyl on top.
explain reasoning / ask students to explain.
shake bottle and then ask students to suggest what has happened and why. |
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Students should be able to explain the differences in density between the different states of matter in terms of the arrangement of atoms or molecules. |
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In terms of particles, explain why ther are differences in density between the different states of matter. |
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If a change of state happens the energy needed for a substance to change state is called latent heat. |
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What is meant by the latent heat of a substance? |
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When a change of state occurs, the energy supplied changes the energy stored (internal energy) but not the temperature. |
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What happens to the temperature when a change of state occurs? |
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Students should be able to describe how, when substances change state (melt, freeze, boil, evaporate, condense or sublimate), mass is conserved. |
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What happens to the mass of a substance as it changes state? |
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The specific latent heat of a substance is the amount of energy required to change the state of one kilogram of the substance with no change in temperature. |
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What is the specific latent heat of a substance? investigate the cooling curve of stearic acid. Record temperature and plot on graph. |
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Changes of state are physical changes which differ from chemical changes because the material recovers its original properties if the change is reversed. |
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How do changes of state differ from chemical changes? |
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