rusting/corrosion of iron

Question 1

rusting

Answer 1

• process when iron is oxidises to iron(III) oxide in the presence of oxygen and water
• exothermic reaction

Question 2

methods of preventing rusting

Answer 2

• placing a barrier(paint, plastic/electroplating with copper)—>this will prevent oxygen and water from reaching the iron
• using a sacrificial protection(more reactive metal)—>the more reactive metal corrodes preferentially
• alloys—>adding chromium makes steel resistant to corrosion