Preventing rusting by galvanising
2 marks · EasyA metal sheet weighing 1.2 kg is coated by galvanising to prevent rusting. The layer of zinc adds 0.006 kg to its mass. Calculate the percentage increase in mass of the sheet after galvanising. Give your answer as a percentage to two decimal places.
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0.50% (±0.01)
Also accept: 0.50; 0.5
Common mistakes: Dividing 1.2 by 0.006 instead of 0.006 by 1.2
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Marking points
M1 · 1 mark · Divides added zinc mass by original mass and multiplies by 100 (sets up percentage calculation correctly).
A1 · 1 mark · Arrives at the correct percentage increase (0.50%).
Worked solution
Percentage increase = (added mass/original mass) × 100
Final answer: 0.50%