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 the amount of product in a cell depends on the number of electrons that pass. (Guide: “Counting electrons with an ammeter and a clock”; Practice Q1)
- I can state what the Faraday constant represents and why it works like a molar mass for charge. (Guide: “The Faraday constant”; Practice Q1)
- I can explain why cells joined in series pass the same charge, and why both electrodes of one cell share the same moles of electrons. (Guide: Worked example 3; Practice Q2)
- I can say which changes alter the amount of product (current, time, ion charge) and which do not (concentration, electrode size). (Guide: “What changes the amount of product”; Practice Q3)
Calculation
- I can use I = q / t to find charge, time or current, with time in seconds. (Practice Q1, Q4(a))
- I can convert charge into moles of electrons with F, and back again. (Guide: Figure 1; Practice Q1)
- I can use a half-reaction to link moles of electrons to moles of metal deposited or removed. (Guide: Worked example 1; Practice Q4)
- I can work backwards from a target mass to the time or current needed. (Guide: Worked example 2; Practice Q4(a))
- I can find the charge on a metal ion from the mass deposited by a measured charge. (Guide: Worked example 3; Practice Q5)
- I can find the moles and volumes of gases formed at electrodes, using 2 e⁻ per H₂ or Cl₂ and 4 e⁻ per O₂. (Practice Q7)
- I can apply the same calculation to the anode of a galvanic cell. (Guide: “The same counting works in a galvanic cell”; Practice Q6)
Reasoning
- I can evaluate a claim about electrode mass changes by separating equal moles of electrons from unequal masses. (Practice Q6(c))
- I can explain why a measured mass may be smaller than the Faraday calculation predicts. (Guide: “What changes the amount of product”; Practice Q6(d))
- I can explain a gas volume ratio from the electron counts in the two half-reactions. (Practice Q7(d))
All ticked? This is the last topic in the course framework. Return to the course roadmap to plan whole-course revision, or revisit Topic 9.8, Galvanic (Voltaic) and Electrolytic Cells if cell diagrams still slow you down.