Work through the list without notes. If you cannot do a statement, follow its link, then come back. Guide = study guide; Practice = practice questions.
Understanding
- I can name the four variables in PV = nRT and give a suitable unit for each. (Guide: “What the ideal gas law says”)
- I can choose the value of R that matches my pressure and volume units. (Guide; Practice Q5)
- I can explain why gas-law calculations need temperature in kelvin. (Practice Q2, Q6)
- I can explain what a partial pressure is and why each gas in a mixture acts independently. (Guide: “Mixtures of gases”; Practice Q7)
Calculation
- I can use PV = nRT to find the amount or mass of a gas. (Guide: Worked example 1; Practice Q5)
- I can find new conditions after a change using P₁V₁ / T₁ = P₂V₂ / T₂. (Guide: Worked example 2; Practice Q2)
- I can calculate mole fractions and partial pressures, and check that they add up. (Guide: Worked example 3; Practice Q3, Q7)
- I can subtract the vapour pressure of water for a gas collected over water. (Practice Q5)
- I can find a molar mass from gas density and use it to identify a gas. (Guide: “Molar mass from gas density”; Practice Q4)
Reasoning
- I can predict whether a gas property doubles, halves or stays the same when another property changes. (Guide: relationships table; Practice Q2)
- I can identify which gas-law graphs are straight lines through the origin and which are curves. (Guide: Figure 1; Practice Q1)
- I can extrapolate a volume–temperature graph to absolute zero and explain the intercept. (Practice Q6)
- I can evaluate a claim about a gas mixture using partial pressures. (Practice Q7)
All ticked? Move on to Topic 3.5, Kinetic Molecular Theory, or return to the course roadmap.