Activity 01
Inquiry Circle: The Great Ice Melt
Small groups are given an ice cube and must find the fastest way to melt it using only 'natural' classroom heat (no kettles). They must record the temperature every two minutes and plot a graph, discussing which variables (like surface area or insulation) affected the speed of the change.
Explain what happens to ice when it melts into water.
Facilitation TipDuring The Great Ice Melt, circulate with a timer so students notice how different materials melt at different rates and can connect this to thermal energy transfer.
What to look forGive students a card with a picture of ice melting. Ask them to write two sentences explaining what is happening and what state the water will be in next. Then, ask them to draw a simple picture of condensation forming on a cold glass.
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Activity 02
Stations Rotation: Reversible vs Irreversible
Set up stations with different changes: melting an ice cube, dissolving salt in water, frying an egg (video), and burning paper (video). Students must decide at each station if the change could be 'undone' and explain why, focusing on whether a new material was created.
Compare the process of evaporation with boiling.
Facilitation TipIn Reversible vs Irreversible, prepare two identical sets of materials so students rotate without waiting and can compare outcomes side by side.
What to look forShow students a video clip of water boiling. Ask: 'What is the difference between this boiling and the evaporation we saw when water disappeared from a dish?' Have students write down one key difference.
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Activity 03
Think-Pair-Share: The Mystery of the Steam
Show a picture of a boiling kettle and a mirror with 'fog' on it. Ask students to identify where the water is changing state in both images. They think individually, discuss the terms 'evaporation' and 'condensation' with a partner, and then explain the role of heat in both processes.
Predict what will happen to water vapour when it touches a cold surface.
Facilitation TipFor The Mystery of the Steam, provide one cold spoon per pair so every student can hold it near the kettle spout and observe condensation in real time.
What to look forPlace a cold metal spoon in a room with visible water vapor (e.g., from a kettle). Ask students: 'What do you predict will happen when the water vapor touches the cold spoon? Why?' Facilitate a discussion about their predictions and observations.
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Generate Complete Lesson→A few notes on teaching this unit
Teachers should model precise thermometer use and insist on repeated measurements to build accuracy and reduce random error. Avoid rushing through cooling curves; let students feel the plateau at 0°C and 100°C for themselves. Research shows that drawing particle diagrams alongside observations deepens understanding of why temperature stays constant during phase changes.
Students should articulate how heating and cooling cause predictable changes between solids, liquids, and gases and use thermometers with confidence to link temperature readings to these transitions. They should also distinguish reversible changes from those that cannot be undone.
Watch Out for These Misconceptions
During The Great Ice Melt, watch for students who call sugar dissolving in water the same as ice melting.
Set up a side-by-side setup: one clear cup with an ice cube and one with a sugar cube. Ask students to describe what they see and feel, then prompt them to compare the disappearance of the ice (melting) with the sugar dissolving (mixing).
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