Corrosion of Metals
Chemistry ⇒ Metals and Non-metals
Corrosion of Metals starts at 8 and continues till grade 12.
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See sample questions for grade 8
A steel bridge is exposed to rain and air. Suggest two ways to protect it from corrosion.
Describe one way in which corrosion can be prevented in ships.
Describe the process of rusting in iron.
Explain how oiling or greasing prevents corrosion of metals.
Explain the term 'galvanization'.
A steel bridge is exposed to rain and air. Suggest two ways to protect it from corrosion.
A metal object is buried underground where the soil is moist and contains salts. Predict and explain what will happen to the object over time.
A water tank made of iron is leaking slightly, causing water to be in constant contact with the metal. Suggest and explain a method to reduce the rate of corrosion in this situation.
Which of the following is a chemical reaction involved in the corrosion of iron?
(1) Fe + O₂ + H₂O → Fe₂O₃·xH₂O
(2) Fe + HCl → FeCl₂ + H₂
(3) Fe + S → FeS
(4) Fe + CuSO₄ → FeSO₄ + Cu
Which of the following is a correct statement about corrosion?
(1) It is a physical change
(2) It only occurs in the absence of air
(3) It is a chemical change
(4) It makes metals stronger
Which of the following is a disadvantage of corrosion?
(1) Increases strength of metals
(2) Causes damage to structures
(3) Improves appearance
(4) Reduces pollution
Which of the following is a reason why gold does not corrode?
(1) It is a very reactive metal
(2) It forms a protective oxide layer
(3) It is a noble metal
(4) It reacts with water
Fill in the blank: The chemical formula for rust is _______.
Fill in the blank: The corrosion of silver produces a black coating called _______.
Fill in the blank: The green coating on copper is called _______.
Fill in the blank: The process of corrosion involves a _______ change in the metal.
True or False: All metals corrode at the same rate.
True or False: Corrosion can be completely stopped by using only one method of protection.
True or False: Corrosion can be prevented by keeping metals dry.
True or False: Corrosion can weaken metal structures and cause them to fail.
