One step in the extraction of zirconium metal involves the displacement reaction between zirconium tetrachloride, ZrCl4\text{ZrCl}_4ZrCl4, and sodium.
ZrCl4+4Na→Zr+4NaCl \text{ZrCl}_4 + 4\text{Na} \rightarrow \text{Zr} + 4\text{NaCl} ZrCl4+4Na→Zr+4NaClThis equation can be simplified to the following ionic equation:
Zr4++4Na→Zr+4Na+ \text{Zr}^{4+} + 4\text{Na} \rightarrow \text{Zr} + 4\text{Na}^+ Zr4++4Na→Zr+4Na+Explain, in terms of electrons, why this displacement reaction is classified as a redox reaction.
110 exam-style questions on Edexcel GCSE Chemistry 5.1 Obtaining and using metals, covering 5.1.1 The reactivity series of metals, 5.1.2 Displacement reactions as redox reactions, 5.1.3 Extracting metals from ores by reduction, 5.1.4 Biological methods of metal extraction, 5.1.5 Resistance to oxidation and recycling metals, and 5.1.6 Life cycle assessment. Each one has a worked solution and a mark scheme showing where the marks go.