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 explain why a value of K belongs to one equation written one way, and why rewriting the equation does not change the mixture. (Guide: “One reaction, many equations”; Practice Q7)
- I can explain, from the expressions, why reversing an equation gives 1/K. (Guide: Rule 1)
- I can explain why multiplying the coefficients by c raises K to the power c, including c = ½. (Guide: Rule 2; Practice Q7)
- I can explain why adding equations multiplies the K values, and why intermediates cancel. (Guide: Rule 3; Practice Q6)
Calculation
- I can find K for a reversed, doubled, tripled or halved equation. (Guide: Worked example 1; Practice Q1, Q2)
- I can combine the K values of two or more steps to find K for an overall reaction. (Practice Q3, Q6)
- I can plan a route to a target equation (multiply, add, reverse) and apply the matching change to K at each step. (Guide: Worked example 2 and Figure 1; Practice Q4)
- I can apply the same rules to Q, and check one result directly from concentrations. (Guide: “The same rules apply to Q”; Practice Q5)
Reasoning
- I can prove a manipulation by writing out and combining the expressions, showing which species cancel. (Practice Q4, Q6)
- I can decide whether a mixture is at equilibrium by comparing Q and K for the same version of the equation. (Practice Q5)
- I can spot and correct the errors “double K”, “add the K values” and “make K negative”. (Guide: “Common misconceptions”; Practice Q1–Q3, Q7)
All ticked? Move on to Topic 7.7, Calculating Equilibrium Concentrations, or return to the course roadmap.