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Conceptual understanding: changes in internal energy alter molecular motion to change the state of matter (form) or the amount of molecular motion (temperature).
Conceptual understanding: changes in internal energy alter molecular motion to change the state of matter (form) or the amount of molecular motion (temperature).
Global context: scientific and technical innovation - internal energy changes can be communicated graphically.
Global context: scientific and technical innovation - internal energy changes can be communicated graphically.
Unit Structure
Unit Structure
Strand 1: describing internal energy
Changes in internal energy affect molecular motion.
Energy can be transformed but is conserved in an isolated system.
Isolated systems undergo change and seek equilibrium.
Inquiry questions:
What is temperature? (F)
What is energy and how do we quantify it in objects? (C)
Will useful energy ever ‘run out’? (C)
Where did the energy originally come from? (D)
Strand 2: quantifying energy change
Heating is the movement of energy from hot to cold areas.
Energy added to an isolated system leads to quantifiable changes.
Inquiry questions:
What is efficiency? (F)
How is convection seen in weather? (F)
What does the change of state graph show us? (F)
How can we visualise changes in internal energy? (F)
Is any energy transfer 100% efficient? (C)
What does equilibrium mean? (C)
What happens to’ lost/degraded’ energy? (C)
Approaches to Learning:
Approaches to Learning:
Thinking - Critical - Use models and simulations to explore complex systems and issues (with a focus on particle behaviour)
Communication - Organise and depict information logically
Applications and skills:
Applications and skills:
Describe the motion of particles in different states and how this relates to the internal energy of the object.
Explain that heat moves from hot to cold regions.
Use internal energy to identify the different energy changes in a change of state graph.
Explain the role of particle movement in conduction, convection, and evaporation.
Relate these heat transfers to each section of the change of state graph.
Explain the transfer of energy as radiation/IR.
Quantify energy in thermal energy changes using specific heat capacity and latent heat. Relate these to each section of the change of state graph.
Assessments:
Assessments:
Summative assessment - test will be conducted after unit 5 as a combined units 3-5 test.
Formative task - internal energy change (AS 1-3).
Summative quick quiz (15 min) assessing heat transfers (AS 4-6).
Formative task - insulation poster (AS 2, 4).
Formative video task explaining the methodology for SHC and LH problems (AS 7).
Summative task - Graphing summary (AS 1, 3-7).
Summative assessment - this unit will also be assessed in the end of year exam.
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