Lesson Plan

• Describe how temperature influences gas volume (Charles’s Law).
• Explain how pressure influences gas volume (Boyle’s Law).
• Apply the combined gas law to solve problems with simultaneous changes in temperature and pressure.
• Interpret graphs that show the relationships between volume, temperature, and pressure.
• Use the ideal gas equation to calculate moles when required.

• Projector and screen
• Whiteboard and markers
• Worksheets with gas‑law problems
• Calculators
• Demonstration set (syringes, pressure gauge, heated water bath)
• Printed summary table of gas laws

Begin with a quick demonstration: compress a syringe while heating another to show opposite effects. Ask students what they expect to happen based on prior knowledge of Boyle’s and Charles’s laws. Explain that by the end of the lesson they will be able to predict and calculate gas‑volume changes when temperature and pressure vary. Success criteria: correctly use the combined gas law in a sample problem.

1. Do‑now (5') – short quiz on Boyle’s and Charles’s laws.
2. Mini‑lecture (10') – review kinetic theory and derive the two laws with formulas.
3. Demonstration (8') – syringe experiments illustrating temperature and pressure effects; discuss observations.
4. Guided practice (12') – work through the combined gas law example (sample question) in pairs.
5. Independent worksheet (10') – solve three mixed problems and interpret related graphs.
6. Check‑understanding (5') – exit ticket: one sentence explaining volume change when both temperature and pressure increase.

Summarise that volume increases with temperature and decreases with pressure, and the combined gas law integrates both effects. Students complete an exit ticket stating the formula they would use for a given scenario. Assign homework: a set of mixed gas‑law problems from the textbook. Remind them to convert all temperatures to kelvin.