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1.3

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Total cards: 8•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (8)

#1
Front (Question)

Health & Safety

Back (Answer)

• The main hazard in this experiment is one of heat. Take care not to touch any apparatus that is hot. • When observing the experiment, wear safety glasses at all times. • Take particular care at stages 3 and 4 below.

#2
Front (Question)

Procedure

Back (Answer)

• Measure the mass of the crucible + lid. • Put the magnesium ribbon to the crucible. You will need to coil the magnesium so that it fits. Reweigh the crucible + lid. • Arrange the apparatus as below and heat the crucible strongly. Raise the crucible lid slightly using tongs to control the reaction • When the reaction is nearly complete, place the crucible lid on the heat-proof mat and heat the crucible strongly for 5 minutes. During this time, tap the magnesium oxide gently with tongs to break up the residue. • Allow the crucible to cool and reweigh the crucible, its contents and the lid. • Calculate the mass of magnesium that you reacted, the magnesium oxide formed and oxygen that reacted. • Calculate the mol of Mg and O atoms in the magnesium oxide that you prepared. • Determine the empirical formula of magnesium oxide.

#3
Front (Question)

• Why did you need to raise the crucible lid slightly when you first heated the magnesium?

Back (Answer)

• To allow sufficient oxygen to enter the crucible

#4
Front (Question)

• What was the purpose of breaking up the magnesium oxide whilst heating the contents of the crucible strongly for 5 minutes?

Back (Answer)

• To ensure it could fully react with the oxygen available.

#5
Front (Question)

• The formula from this experiment often shows slightly less oxygen than is present in magnesium oxide. Suggest why this should be so.

Back (Answer)

• Not all of the magnesium may have reacted.

#6
Front (Question)

• If magnesium is heated very strongly in pure nitrogen, magnesium nitride is formed. This compound is a black colour and usually a small amount of this compound contaminates the magnesium oxide that is formed in this experiment. (a) Why does the magnesium react with oxygen rather than nitrogen?

Back (Answer)

• a) oxygen is more reactive than nitrogen

#7
Front (Question)

(b) 1.82 g of magnesium reacted to form 2.52 g of magnesium nitride. Calculate the formula of magnesium nitride.

Back (Answer)

b) 2.52 – 1.82 = 0.7 g 1.82 ÷ 24.3 = 7.49 × 10-2 mol 0.7 ÷ 14 = 0.05 mol Ratio 1.5:1 Scale 3:2 So Mg3N2

#8
Front (Question)

equipment

Back (Answer)

Each learner or group will require access to the following • safety spectacles (or goggles) • access to balance accurate to two decimal places • crucible • Bunsen burner • tripod • heatproof mat • pipeclay triangle