Uses of aluminium
2 marks · EasyA newly-made sheet of aluminium has a mass of 5.4 g. After some time, a 0.0004 g layer of aluminium oxide forms on the surface, preventing further corrosion. Calculate the total mass of the sheet after the oxide layer has formed. Give your answer to 3 decimal places.
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5.400 g + 0.0004 g = 5.4004 g (±0.0001)
Also accept: 5.400 g (if not rounded, penalise as appropriate)
Common mistakes: Adding incorrectly or rounding wrongly.
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Marking points
M1 · 1 mark · Shows correct addition of masses: 5.400 + 0.0004
A1 · 1 mark · Ccorrect total mass stated as 5.4004 g (to at least 4 decimal places).
Worked solution
Total mass = mass of aluminium + mass of oxide layer