Level H2 Chemistry 2021 Paper 3 Answers: A

Cell potential decreases. Reasoning: ( MnO_4^- ) reduction involves ( H^+ ) (8H+ per MnO4-). Increasing pH (lower [H+]) reduces the reduction potential of the ( MnO_4^-/Mn^2+ ) couple (Nernst equation: ( E = E^\circ - \frac0.0595 \log\frac[Mn^2+][MnO_4^-][H^+]^8 )). Lower cathode potential reduces overall ( E_cell ).

: When comparing acid strength (e.g., HFcap H cap F HClcap H cap C l ), students needed to explicitly link the stronger bond to a lower likelihood of dissociation in water. Accessing Full Materials A Level H2 Chemistry 2021 Paper 3 Answers

Students were required to identify the oxidation states of Vanadium in different compounds. Vanadium is famous for its four oxidation states (+5, +4, +3, and +2), each exhibiting a distinct colour in aqueous solution. Cell potential decreases

) due to the inductive effect of chlorine atoms increasing the extent of dissociation. Course Hero 4. Critical Exam Errata (Question 5) The 2021 paper is notable for a structural error in a diagram within Question 5. Mothership The Error: Lower cathode potential reduces overall ( E_cell )

💡 To help you study better,g., the Organic Elucidation) The full list of definitions required for the 2021 syllabus Comparison notes between the 2021 and 2022 papers

Arrhenius Equation and Activation Energy calculations. Equilibria: Buffer capacity and pH curves.