2.2 Redox, Rusting and Iron Flashcards
what is a redox reaction?
a reaction in which both oxidation and reduction occour.
What is oxidation? x3
- gain of oxygen
- loss of hydrogen
- loss of electrons
what is reduction? x3
- loss of oxygen
- gain of hydrogen
- gain of electrons
what are the conditions for rust?
water and oxygen
what type of reaction is rusting and why?
oxidation reaction, iron gains oxygen and the gain of oxygen is oxidation
what is the chemical name for rust?
Hydrated Iron (III) oxide
what are methods to prevent rusting? x5
- painting
- oiling
- plastic coating
- metal plating
- sacrififcial protection
what are methods to prevent rusting? x5
- painting
- oiling
- plastic coating
- metal plating
- sacrificial protection
what is galvinising?
coating a metal with a layer of zinc
what is the chemical name for:
Haematite
Limestone
Coke
- iron (III) oxide
- calcium carbonate
- carbon
how can we extract iron from its ore?
through the use of a blast furnace
explain using equations stage 1 of the blast furnace
the production of the reducing agent (CO)
- C + O2 → CO2 (This reaction produces heat)
- C + O → 2CO
explain using equations stage 2 of the blast furnace
reduction of haematite
-Fe2O3 + 3CO → 2Fe + 3CO2 (molten iron sinks to
bottom)
explain using equations stage 3 of the blast furnace
removal of the acidic impurities (silicon dioxide)
- CaCO3 → CaO + CO2 (Thermal decomposition)
- CaO + SiO2 → CaSiO3 (molten slag, calcium silicate,
sinks and floats on top of the molten iron)
aside from the three main substances needed in the blast furnace, what must be blasted in?
hot air
