The figure below shows six test tubes a student set up to investigate the rusting of iron. This is the method used for each test tube. 1. Measure the mass of the nail using a balance. 2. Leave the nail in the test tube for 6 days. 3. Measure the mass of the nail after 6 days.Use the results of the student’s investigations to draw conclusions about the factors affecting the rusting of iron. Include an evaluation of the effectiveness of different coatings at preventing the rusting of iron.  – 6195

One thought on “The figure below shows six test tubes a student set up to investigate the rusting of iron. This is the method used for each test tube. 1. Measure the mass of the nail using a balance. 2. Leave the nail in the test tube for 6 days. 3. Measure the mass of the nail after 6 days.Use the results of the student’s investigations to draw conclusions about the factors affecting the rusting of iron. Include an evaluation of the effectiveness of different coatings at preventing the rusting of iron.  – 6195”

1. Observations:
   Rust happened in test tubes 1 and 5.
   Test tubes 1 and 4 had air and water.
   No rust in test tubes 2, 3, and 4.
   Test tube 2 had no water, and test tube 3 had no air.
   Paint in test tube 4 stopped rust.
   Test tube 6 had scratched galvanised iron, but it didn’t rust.
   Galvanising in test tube 6 stopped rusting.
   Conclusions:
   Rust needs both air and water.
   Coatings stop rust if they keep out air and water.
   If paint is scratched, rust can happen.
   Less rust in test tube 5 than 1 because less iron was exposed.
   Galvanising is better than paint when scratched.
   Zinc protects iron because it reacts first.
   Evaluation:
   Oil and paint work if not damaged.
   Galvanising is best because it still works when scratched.

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