4. Electrochemistry
A section of Chemistry, 0620
Listing 10 of 500 questions
Lead(bromide is a white solid. Part of the structure of lead(bromide is shown below. Br – Br – Br – Br – Pb2+ Br – Br – Br – Br – Pb2+ Br – Br – Pb2+ Br – Br – Pb2+ Pb2+ Pb2+ Deduce the simplest formula for lead(bromide. A student electrolysed lead(bromide in a fume cupboard using the apparatus shown below. anode cathode lead(bromide Why is heat needed for this electrolysis? Suggest the name of a substance that could be used for the electrodes. State the name of the products of electrolysis at: the anode, the cathode. Items can be electroplated with silver using the apparatus shown below. B C A D rod of silver alloy rod electrolyte + – On the diagram, which letter, A, B, C or D, is the cathode? What would you observe during the experiment at the: positive electrode, negative electrode? The electrolyte used is aqueous silver cyanide, AgCN. Calculate the relative formula mass of silver cyanide. You must show all your working.
0620_s14_qp_23
THEORY
2014
Paper 2, Variant 3
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Questions Discovered
500