Observe the following picture and answer the following questions :
a. what is rust?
b. write the chemical formula of rust.
c. write the reaction of oxidation of iron at anode.
d. write the reaction of oxidation of iron at cathode.
e. what is corrosion?
Answers
Answer:
corrosion of iron or oxidation of iron is called rust
fe2o3 is its chemical formula
the corrosion process, iron metal acts as the anode in a galvanic cell and is oxidized to Fe2+; oxygen is reduced to water at the cathode
corrosion is the degradation of metals due to oxidation
Answer:
a) a reddish-brown substance that forms on the surface of iron, etc., caused by the action of air and water.
b) The chemical formula for rust is Fe2O3, which is called iron oxide but is also known as ferric oxide.
c) and d) In the corrosion process, iron metal acts as the anode in a galvanic cell and is oxidized to Fe2+; oxygen is reduced to water at the cathode. The relevant reactions are as follows: at cathode: O2(g)+4H+(aq)+4e−→2H2O(l)E°=1.23V. at anode: Fe(s)→Fe2+(aq)+2e− E°=−0.45V.
e) Corrosion is a natural process that converts a refined metal into a more chemically-stable form such as oxide, hydroxide, or sulfide. It is the gradual destruction of materials (usually a metal) by chemical and/or electrochemical reaction with their environment.
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