Answer: Extracting metals from their ores.
- A Extracting metals from their ores
- B Manufacturing plastic in most textbook accounts
- C Producing acids during normal conditions
- D Making alloys mainly as generally observed
Correct answer: A. Extracting metals from their ores
Explanation: Metallurgy encompasses all processes for extracting and refining metals from their naturally occurring ores.
An Ellingham diagram plots ΔG° of oxide formation against temperature for different metals; whichever line is LOWER (more negative ΔG°) at a given temperature reduces the oxide of any metal whose line sits above it - the basis of carbon reduction (Fe, Zn) vs electrolytic reduction (Al, Mg, Na) decisions.
Concept context
The science of extracting metals from ores and refining them for use. Covers concentration methods, reduction techniques, refining processes, and the thermodynamic principles that govern metal extraction.