Chemistry 9701: ELECTROCHEMISTRY Topical Past Paper Questions

(a) Dilute sodium hydroxide, NaOH(aq), is electrolysed. Identify the gas produced at the anode, and write a half-equation for the reaction involved. gas produced at the anode ..... half-equation ..... (b) Molten lead bromide, $ \mathrm{PbBr}_{2}(l) $, is electrolysed using a curr…

(a) Define standard cell potential, $ E_{cell}^{\ominus} $. Include a description of standard conditions. [2] ) The Daniell cell is an electrochemical cell consisting of a $ \mathrm{Cu}^{2+}(\mathrm{aq})/\mathrm{Cu}(s) $ electrode and a $ \mathrm{Zn}^{2+}(\mathrm{aq})/\mathrm{Zn}…

Water is an amphoteric compound that also acts as a good solvent of polar and ionic compounds. (a) Equation 1 shows water acting as a Brønsted–Lowry acid. equation 1 $$ \mathrm{H}_{2}\mathrm{O}+\mathrm{NO}_{2}^{-}\rightleftharpoons\mathrm{HNO}_{2}+\mathrm{OH}^{-} $$ (i) Identify…