Determine whether each melting point observation corresponds to a pure sample of a single compound or to an impure sample with multiple comp

Question

Determine whether each melting point observation corresponds to a pure sample of a single compound or to an impure sample with multiple compounds.

a. Wide melting point range __________
b. Experimental melting point is close to literature value _________
c. Experimental melting point is below literature value _________
d. Narrow melting point range __________

in progress 0
Thu Hương 4 years 2021-07-17T15:56:47+00:00 1 Answers 64 views 0

Answers ( )

  1. mit
    0
    2021-07-17T15:57:51+00:00
    Reply

    Answer:

    Wide melting point range – impure sample with multiple compounds

    Experimental melting point is close to literature value – pure sample of a single compound

    Experimental melting point is below literature value – impure sample with multiple compounds

    Narrow melting point range – pure sample of a single compound

    Explanation:

    The melting point of substances are easily obtainable from literature such as the CRC Handbook of Physics and Chemistry.

    A single pure substance is always observed to melt within a narrow temperature range. This melting temperature is always very close to the melting point recorded in literature for the pure compound.

    However, an impure sample with multiple compounds will melt over a wide temperature range. We also have to recall that impurities lower the melting point of a pure substance. Hence, the experimental melting point of an impure sample with multiple compounds is always below the literature value.

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )