4.1. Electrolysis
A subsection of Chemistry, 0620, through 4. Electrochemistry
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This question is about chemical reactions and electricity. The diagram shows the apparatus used in the production of electrical energy in a simple cell. V voltmeter iron electrode zinc electrode electrolyte The zinc electrode dissolves in the electrolyte forming Zn2+ions. Draw an arrow on the diagram to show the direction of electron flow. Write the ionic half-equation for the reaction that occurs when the zinc electrode dissolves. The reading on the voltmeter can be increased if either zinc or iron is replaced by another metal. Name a metal that can replace zinc and increase the reading on the voltmeter. Name a metal that can replace iron and increase the reading on the voltmeter. Fuel cells are used to generate electricity. Name the reactants in a fuel cell. Name the waste product of a fuel cell. Electricity can be used to break down aqueous or molten ionic compounds. Name the process which uses electricity to break down aqueous or molten ionic compounds. Explain why the ionic compound needs to be aqueous or molten. Brine is concentrated aqueous sodium chloride. Name three substances which are manufactured by passing electricity through brine.  Name a different substance formed when molten sodium chloride is used instead of concentrated aqueous sodiumchloride. 
0620_m22_qp_42
THEORY
2022
Paper 4, Variant 2
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