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 11
A ship's hull is made of iron and is protected from corrosion by attaching blocks of magnesium. Explain why magnesium is used.
Describe one environmental impact of metal corrosion.
Describe the process of cathodic protection in preventing corrosion.
Describe the role of moisture in the corrosion of iron.
A ship's hull is made of iron and is protected from corrosion by attaching blocks of magnesium. Explain why magnesium is used.
Explain why iron nails rust faster in coastal areas than in dry inland areas.
A pipeline made of iron is buried underground and is found to corrode rapidly in certain areas. Suggest two possible reasons for the variation in corrosion rate along the pipeline and explain your reasoning.
A steel bridge is exposed to acid rain over several years. Describe the chemical reactions that occur during the corrosion process and explain how acid rain accelerates corrosion.
Which of the following environments would accelerate the corrosion of iron the most? (1) Dry air (2) Humid air (3) Air with high CO2 (4) Air with low oxygen
Which of the following equations correctly represents the rusting of iron? (1) 4Fe + 3O2 + 6H2O → 4Fe(OH)3 (2) 2Fe + O2 → 2FeO (3) Fe + S → FeS (4) Fe + Cl2 → FeCl2
Which of the following is a sacrificial metal used to protect iron from corrosion? (1) Copper (2) Zinc (3) Silver (4) Gold
Which of the following is NOT a factor affecting the rate of corrosion? (1) Presence of impurities (2) Surface area of the metal (3) Color of the metal (4) Temperature
Fill in the blank: The chemical formula for rust is __________.
Fill in the blank: The process of coating iron with a layer of zinc to prevent corrosion is called __________.
Fill in the blank: The process of depositing a thin layer of chromium on metals to prevent corrosion is called __________.
Fill in the blank: The process of protecting iron by coating it with a thin layer of another metal, such as tin, is called __________.
True or False: All metals corrode at the same rate under identical conditions.
True or False: Corrosion always requires the presence of water.
True or False: Corrosion can only occur in metals that are in contact with water.
True or False: Corrosion is always a slow process.
