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Questions and Answers
It is difficult, though, to find a melting ________
point
During the melting process, all of the energy added to a substance is consumed as heat of ________
fusion
Impurities tend to depress and broaden the melting range, so the purified sample should have a higher and smaller melting ________ than the original, impure sample
range
The melting point of a substance is a physical property often used to identify compounds or to check the purity of the ________
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Determining the melting point of a compound is one way to test if the substance is ________
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The melting point of a substance is a measure of the amount of kinetic energy (heat) that must be supplied to the particles of the substance in order to overcome the ________ forces that confine them to the solid state
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A dilute solution of a liquid begins to freeze at a temperature somewhat lower than the ______ point of the pure liquid.
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As the pure solvent crystallizes from solution, the concentration of the impurity must increase and the ______ point of the solution must fall.
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A sharp melting point is often taken as evidence that the sample is fairly ______.
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An identical or near identical temperature range of melting is not, in itself, proof of the ______ of two organic chemical samples.
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If each individual sample melts 'sharply' and at the same temperature, and if an intimate mixture of the two, made by rubbing approximately equal amounts together, melts over a wide ______, the two substances are not the same.
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Usually, however, you wish to establish the ______ rather than the nonidentity of two samples.
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