4.1. Electrolysis
A subsection of Chemistry, 0620, through 4. Electrochemistry
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Many plants contain coloured pigments. A student crushes some plant leaves in alcohol to extract the pigments. She then separates the pigments using the apparatus shown below. Write the correct labels in the boxes in the diagram above. Draw an X on the diagram above to show where a drop of the pigment solution is placed at the start of the experiment. After leaving the apparatus for half an hour, the pigments separated from each other. State the name given to this method of separating pigments. Some plants can absorb nickel from the ground. The nickel can then be extracted from the plants and purifi ed by electrolysis. + – rod of pure nickel electrolyte rod of impure nickel power supply Which one of the following is the most suitable electrolyte for this electrolysis. Tick one box. aqueous copper(sulfate aqueous nickel(sulfate solid nickel(sulfate water Which one of the following elements is most likely to be formed at the negative electrode during this electrolysis? Put a ring around the correct answer. chlorine nickel sulfur oxygen The positive electrode is called the anode. State the name of the negative electrode. Electroplating is used to put a thin layer of one metal on top of another by electrolysis. Give two reasons for electroplating metals. 1. 2. Hydrated nickel(chloride is green in colour. When hydrated nickel(chloride is heated gently, it changes colour from green to white. Complete the symbol equation for this reaction. NiCl 2.6H2ONiCl 2+ hydrated nickel(chloride What does the sign mean? How can you obtain a sample of green nickel(chloride starting with white nickel(chloride?
0620_w13_qp_21
THEORY
2013
Paper 2, Variant 1
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