Lesson Plan

• Describe the four principal changes of state (melting, freezing, evaporation, condensation) and the associated energy changes.
• Explain the difference between evaporation and boiling.
• Interpret symbolic forms for each transition and give real‑world examples.
• Predict whether heat is absorbed or released during each change of state.

• Projector or interactive whiteboard
• Printed worksheet with phase‑change table
• Ice cubes and a kettle/hot plate
• Thermometer
• Student notebooks and pens
• Exit‑ticket cards

Begin by asking students what they notice when an ice cube is left out on a warm bench. Connect this to their prior knowledge of temperature and heat. Explain that today they will master the specific terms for all solid‑liquid‑gas transitions (except solid‑gas). By the end of the lesson they should be able to name each change, describe the energy flow, and cite everyday examples.

1. Do‑now (5') – Quick quiz on heat vs temperature to activate prior knowledge.
2. Mini‑lecture with slides (10') – Introduce terminology, symbolic forms, and latent‑heat concepts.
3. Demonstration (8') – Melt ice and boil water while students record observations and temperature changes.
4. Guided worksheet activity (10') – Match terms to examples, indicate energy absorbed/released, and fill symbolic forms.
5. Think‑Pair‑Share (5') – Distinguish evaporation from boiling; each pair explains the difference.
6. Misconception check (5') – Address common errors (e.g., evaporation only at boiling point).
7. Quick revision checklist (5') – Whole‑class rapid fire questions using show of hands.
8. Exit ticket (2') – Write one real‑world example for each of the four transitions.

Recap the four state‑change terms, the direction of heat flow, and the key distinction between evaporation and boiling. Collect exit tickets to gauge understanding and assign a short homework worksheet that asks students to calculate the heat required for a given mass to melt or evaporate.