Simple differences between mixtures and compounds
3 marks · EasyClassify each substance in the table as an element, a compound, or a mixture.
| Substance | Classification |
|---|---|
| Argon | |
| Sea water | |
| Ammonia (NH₃) |
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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Argon: element; Sea water: mixture; Ammonia: compound
Must show: Argon: element, Sea water: mixture, Ammonia (NH₃): compound
Also accept: Ammonia: compound
Common mistakes: Sea water as compound
Show mark scheme and worked solution
Marking points
B1 · 1 mark · Classifies Argon as an element.
B2 · 1 mark · Classifies sea water as a mixture.
B3 · 1 mark · Classifies ammonia as a compound.
Worked solution
| Substance | Classification |
|---|---|
| Argon | Element |
| Sea water | Mixture |
| Ammonia (NH₃) | Compound |