10 - Metals Flashcards
1
Q
What is the chemical formula for hematite?
A
Fe₂O₃
2
Q
Extraction of iron from hematite. (blast furnace)
A
C+O₂ → CO₂
Exothermic - Produces energy.
C+CO₂ → 2CO
Carbon monoxide is the main reducing agent.
Fe₂O₃ + 3CO → 2Fe + 3CO₂
Carbon monoxide reduces iron oxide, forming iron.
CaCO₃ → CaO + CO₂
Thermal decomposition forms calcium oxide.
CaO + SiO₂ → CaSiO₃
Calcium oxide reactions with silicon dioxide to form calcium silicate (slag).
Slag can be tapped off.
3
Q
What is the chemical formula of zinc blende?
A
ZnS
4
Q
Extraction of zinc from zinc blende. (Electrolysis)
A
2ZnS + 3O2 → 2ZnO + 2SO2
Zinc is combusted in air to form zinc oxide and sulfur dioxide.
ZnO + C → Zn + CO
Zinc oxide is reduced by coke.
