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. Calculate the difference in percentage increase in mass after 6 days of the nail in test tube 1 and the nail in test tube 5. Give your answer to three significant figures. – 6194

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. Calculate the difference in percentage increase in mass after 6 days of the nail in test tube 1 and the nail in test tube 5. Give your answer to three significant figures. – 6194”

1. 0.46/8.45×100=5.44%
   Test tube 1: 5.44%
   Test tube 2: 0.854%

   Then calculate the difference:
   5.44−0.854=4.586
   5.44−0.854=4.586
   Rounded to 3 significant figures, the final answer is:4.59

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