Answer :
Question 14The melting point of a pure compound is known to be 110-111º. If this compound is contaminated with 5% of an impurity, the melting behavior expected is: 110-111º. Impurities will cause melting points to be depressed and the melting range to be broadened, thus the melting point will still be the same.
Question 15Different people can make different judgments as to when a compound has begun to melt, and the melting point apparatus can be out of calibration. This is why both lab partners get two different values with exactly the same sample.
Question 16For the molecule, D-Anisic acid the reported melting point was wrong by the student.
Question 17If a trace amount of an impure compound, whose melting point is 80-82 degrees Celsius, is mixed in with the first compound, the second compound would lower the melting point of the first one.
Question 18The unknown compound with an observed melting point of 90-93 is Compound D.
Question 19The eutectic ratio and temperature for the solid mixture of CHCl3 and CCI4 is 0.5 and 190K respectively. The pairing of Cao with ionic forces is not correct.
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