Prevention of rusting practice exercise 3

A construction company must choose materials for streetlight poles in Nairobi. Compare using painted iron poles versus galvanized iron poles and justify the better choice. (3 marks)

A farmer uses an iron water tank without protection. After 2 years, the tank develops leaks. Discuss why alloying is a better long-term solution than painting or oiling. (2 marks)

A mechanic in Nakuru uses machines with many moving metal parts. Explain which method of rust prevention he should use and why.  (2 marks)

A mechanic in Nakuru uses machines with many moving metal parts. Explain which method of rust prevention he should use and why.  (2 marks)

A resident in Nairobi notices rust forming on a metal window grill despite being painted. On closer inspection, the paint is chipped in some areas. Explain why rust is occurring and suggest a solution.  (2 marks)

A steel bridge in Kisumu shows signs of rusting within 3 years of construction. Suggest three advanced methods the engineers can use to protect the bridge. (3 marks)

A steel bridge in Kisumu shows signs of rusting within 3 years of construction. Suggest three advanced methods the engineers can use to protect the bridge. (3 marks)

A welder in Kisumu is asked to make a metal gate that will be exposed to frequent rain. Suggest two methods he can use to protect the gate from rusting and explain your choices.  (2 marks)

List any four items that are commonly painted to prevent rusting. (2 marks)

List any four items that are commonly painted to prevent rusting. (2 marks)

List any four items that are commonly painted to prevent rusting. (2 marks)

Study the diagram of a car body where the roof is painted, the doors are scratched, and the underside is oiled. Explain which parts are most likely to rust and why. (2 marks)

Study the diagram of a car body where the roof is painted, the doors are scratched, and the underside is oiled. Explain which parts are most likely to rust and why. (2 marks)

Study the diagram below of a car body where the roof is painted, the doors are scratched, and the underside is oiled. Explain which parts are most likely to rust and why. (2 marks)

Study the diagram of two bicycles: Bicycle A stored in a dry garage, Bicycle B left outside in rain. Both are made of iron. Explain why rusting differs between them and suggest preventive measures. (2 marks)

Study the diagram of two bicycles: Bicycle A stored in a dry garage, Bicycle B left outside in rain. Both are made of iron. Explain why rusting differs between them and suggest preventive measures. (2 marks)

Study the diagram below of two bicycles: Bicycle A stored in a dry garage, Bicycle B left outside in rain. Both are made of iron. Explain why rusting differs between them and suggest preventive measures. (3 marks)

Study the table below showing different metals and how long they took to rust under the same environmental conditions. Use the information to answer the questions that follow. (3 marks) Metal sample Time before Rust Appeared (Days) Was the Metal Coated? Type of Coating Iron 3 No None Galvanized Iron 14 Yes Zinc Painted Iron 10 Yes Paint Stainless Steel 30+ (No rust observed) Yes Chromium (Alloyed) a) Which metal was most resistant to rusting? Explain why. (2 marks)b) What does the table suggest about the effectiveness of coatings in rust prevention?  (1 mark)

Study the table below showing different metals and how long they took to rust under the same environmental conditions. Use the information to answer the questions that follow. (3 marks) Metal sample Time before Rust Appeared (Days) Was the Metal Coated? Type of Coating Iron 3 No None Galvanized Iron 14 Yes Zinc Painted Iron 10 Yes Paint Stainless Steel 30+ (No rust observed) Yes Chromium (Alloyed) a) Which metal was most resistant to rusting? Explain why. (2 marks)b) What does the table suggest about the effectiveness of coatings in rust prevention?  (1 mark)

Study the table below showing different metals and how long they took to rust under the same environmental conditions. Use the information to answer the questions that follow. (3 marks) Metal sample Time before Rust Appeared (Days) Was the Metal Coated? Type of Coating Iron 3 No None Galvanized Iron 14 Yes Zinc Painted Iron 10 Yes Paint Stainless Steel 30+ (No rust observed) Yes Chromium (Alloyed) a) Which metal was most resistant to rusting? Explain why. (2 marks)b) What does the table suggest about the effectiveness of coatings in rust prevention?  (1 mark)