Pre-Laboratory Assignment 1. Briefly identify or explain a) two useful hunctions
ID: 807616 • Letter: P
Question
Pre-Laboratory Assignment 1. Briefly identify or explain a) two useful hunctions served by knowing the melting point of an organic compound. )yoe should be used in a me )Miy z 6xwky powdervi sro, should be used in a melting point measurement. (c) why it is important to heat a sample slowly to obtain an accurate melting point. (d) two reasons why it is sometimes difficult to measure the temperature at which the crystals first t begin to liquefy (e) what two effects a soluble impurity usually has on the melting point of a compoundExplanation / Answer
Answer (a):The melting point of a substance is a physical property that allows two types of criteria : Purity and Identification. Purity criteria used to compare the value of fusion of a substance with the tabulated values ??, if ingual is said to be pure but if you give more or less is possible that the substance contains impurities or hydrates. Identification criteria allows to know the melting point of an unknown substance is supposed to be pure this can be located in a range of possible compounds or Retrieve established a list of possibilities.
Answer (b): The fine powder allows the temperature to be homogeneous across the contact surface of the substance analysis , the fine powder allows better visibility when the substance begins the process of fusion .
Answer (c): Take slowly melting temperature prevents a rise in the caloric contribution to the environment in which the melting temperature is measured , which would give us results in a false or erroneous reading of the melting point.
Answer (d): "FIRST" The solids that liquefy often tend to be hygroscopic , reason why it is not easy to take their melting point because, humidity can grasp easily. "SECOND" Liquefy solids , by action of caloric intake intervening in the process of fusion, can cause the solid is sublime easily even before finishing reading the melting point .
Answer (e): Impurities usually descend the melting point of a pure substance. The water usually considerably increases the melting point of a pure substance .
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