Displacement reactions and extraction
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The teaching part (1 min) is free to watch. A free account opens the whole lecture: 2 worked examples, 5 practice questions, 2 real past-paper questions with the answers explained, the mistakes that lose marks, the full-marks tip, a one-card summary and a quick quiz.
What this lecture covers
- The nail that turns copper
- Metal displacement
- The ionic equation
Read the transcript of the teaching part
Last time
Before we start: last time, in Iron, aluminium, alloys and rust protection, you learned these points. Here they are again on one card. Keep them in mind, because today builds on them.
The nail that turns copper
Drop a clean iron nail into blue copper sulfate solution, and in minutes it grows a pink-brown coat. The iron has pushed the copper out of solution. The same ranking that tells us this also tells us how every metal is taken out of its ore.
Metal displacement
A more reactive metal displaces a less reactive metal from a solution of its salt. Iron plus copper sulfate gives iron sulfate plus copper. Fe plus CuSO 4 gives FeSO 4 plus Cu. The blue solution fades to a pale green, and copper is deposited on the iron.
The ionic equation
The sulfate ions are spectators. Leave them out. Fe plus Cu 2 plus gives Fe 2 plus plus Cu. Iron loses 2 electrons, so it is oxidised. The copper ion gains 2 electrons, so it is reduced.
How often it comes up
How often Cambridge has asked each part, counted by ExamYard from every past paper in its question bank: Displacement reactions.
Chapter 9: Metals
- The reactivity series 5 min
- Displacement reactions and extraction 5 min
- Extracting iron and aluminium 6 min
- Alloys and rust protection 5 min
Also for IGCSE Chemistry 0620
Which topics come up most in IGCSE Chemistry 0620 past papers, counted from every paper since 2004.