Causes of rusting practice exercise 1

Define rusting. (1 mark)

Describe how poor maintenance of metallic tools can increase the rate of rusting.  (2 marks)

Describe the role of salt in rusting when metals are exposed to coastal conditions.  (2 marks)

Discuss why iron rusts faster in salty water compared to fresh water.  (2 marks)

Examine the diagram and explain why rusting occurs faster in metal objects left outside in the rain.  (2 marks)

Examine the diagram and explain why rusting occurs faster in metal objects left outside in the rain.  (2 marks)

Explain how moisture causes rusting of iron. (2 marks)

Explain why rusting is more likely to occur in Nairobi during the rainy season.  (2 marks)

State two environmental conditions that promote rusting.  (2 marks)

Study the diagram below showing two iron nails placed in different test tubes. Identify which nail will rust and explain why. (2 marks)

The diagram below shows a panga left outside overnight. In the morning, it had brown spots. Using scientific knowledge, explain what caused this. (2 marks)