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Water hardness, contamination, and the chemical processes used to purify water.
Electrochemical oxidation of metals in moist environments — iron rusting mechanism.
Industrial synthesis of ammonia from N₂ and H₂ — the temperature/pressure trade-off.
N, P and K fertilizers — production methods and their role in agriculture.
Silicate-based industrial materials — composition and manufacture of glass, ceramics and cement.