Can I get help with this please ??? You and your lab partner take melting points

Question

Can I get help with this please ??? You and your lab partner take melting points of the same sample. You observe a melting point of 101- 107degree C, while your partner observes a value of 110-112degreeC. How could you get two different values with exactly the same sample. Circle your answer. Occasionally some instruments are out of calibration One of the lab partners may have heated the melting point device too rapidly Two of you can make different judgements as to when the compound has begun to melt One of you took a larger mass of crystals when taking the melting point All of the above Additional comments

Explanation / Answer

iii) Two of you can make different judgement as to when the compound has begun to melt.

Because melting point is the temperature at which the solid melts to become a liquid. The transition between the solid and the liquid is so sharp for small samples.

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