IGCSE Physics: Change of State Core Practical | Edexcel Modular | Unit 4 | L6 & 7

This two-lesson resource covers spec point 4.11P — obtaining a temperature-time graph to show constant temperature during a change of state, and identifying the freezing point of stearic acid.
PowerPoint includes:

Retrieval starter reviewing particle theory and energy changes from Lesson 5
Direct Instruction (I Do) — aim, method and safety explained clearly with equipment diagram
Guided Practice (We Do) — class synchronisation of first readings, prediction of plateau position
Lesson 1 Independent Practice — students carry out the cooling experiment in pairs, recording every 30 seconds
Lesson 2 Independent Practice — students plot their cooling curve, circle the plateau and evaluate their results
Sources of error analysis and command word matching activity
Review and Reflect exit ticket

Activity Sheet includes:

Lesson 1 data collection table (0–900 seconds, pre-filled time column)
Lesson 2 blank cooling curve graph grid (ready to plot)
6 analysis questions covering graph interpretation, particle explanation, sources of error and evaluation
Stretch prediction question
Full mark scheme for teacher use

This lesson is part of the complete Unit 4 resource pack, available separately at a discounted bundle price.