| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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(MS) energy for a change of state = mass ? specific latent heat
E = m L
energy, E, in joules, J
mass, m, in kilograms, kg
specific latent heat, L, in joules per kilogram, J/kg |
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What is the equation used to calculate the energy for a change of state? Include units in your response. |
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Specific latent heat of fusion is the change of state from solid to liquid |
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What is meant by the term specific heat of fusion? Give an example to show what this means. |
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Students should be able to distinguish between specific heat capacity and specific latent heat. |
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What is the difference between specific heat capacity and specific latent heat? |
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Specific latent heat of vaporisation is the change of state from liquid to vapour |
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What is meant by the term specific heat of fusion? Give an example to show what this means. |
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Students are to gather data to draw part of a heating graph. |
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Using a water bath (set up using a beaker of water over a Bunsen burner), students are to slowly melt the Salol or stearic acid in the boiling tube and record the temperature at small time intervals.
Students record their results in a table and draw a graph of temperature against time to show the Salol temperature remains constant during the melting change of state. |
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Students should be able to interpret heating and cooling graphs that include changes of state. |
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