CH-529
Purity and melting point
Chemistry · Secondary 3 · Medium · Purity and melting point
A liquid sample is suspected to be impure. Its temperature rises steadily from 60 °C to 68 °C while it melts. Which conclusion about the sample is correct?
- It is pure because it melts completely by 68 °C.
- It is impure because it melts over a range of temperatures.
- It is pure because it starts melting at 60 °C.
- It must be a mixture of exactly two pure substances with melting points 60 °C and 68 °C.
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