CH-498
Purity and melting point
Chemistry · Secondary 3 · Medium · Purity and melting point
A student measures the melting point of a solid and finds that it starts melting at 118 °C and is completely liquid at 123 °C. The data booklet states that the pure substance melts at 121 °C. What can be concluded about the sample?
- The sample is pure because it melts near 121 °C.
- The sample is impure because it melts over a range of temperatures.
- The sample is pure because it starts melting below 121 °C.
- The sample is impure because it melts at a higher temperature than 121 °C only.
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