CH-527
Purity and melting point
Chemistry · Secondary 3 · Medium · Purity and melting point
The melting point of pure substance X is 81 °C. A student finds that a sample of X starts melting at 78 °C and finishes melting at 81 °C. What does this suggest about the sample?
- It is impure because it melts over a range below 81 °C.
- It is pure because it finishes melting at 81 °C.
- It is pure because it starts melting below 81 °C.
- It is impure because it does not melt at all at 81 °C.
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