Final answer:
The glass container used to hold the solid compound during the measurement of its melting point is called a capillary tube. Slowing the rate of heating when approaching the melting point is important for more accurate determination. The beginning and end of the melting range can be identified by observing the appearance and disappearance of the solid phase. Chemists measure the melting point of a substance to determine its identity, purity, and suitability for different applications.
Step-by-step explanation:
1. The glass container used to hold the solid compound during the measurement of its melting point is called a capillary tube. To load the solid into the container, a small amount of the compound is usually placed at one end of the capillary tube using a spatula or tweezers.
2. It is important to slow the rate of heating when approaching the melting point of a substance because it allows for more accurate determination of the melting point. Heating too quickly can result in an inaccurate measurement and the appearance of a wider melting range.
3. To identify the beginning of the melting range, one should look for the first signs of melting, such as the appearance of a liquid phase or a change in the solid's appearance. To identify the end of the melting range, one should look for the complete disappearance of the solid phase, when the sample is entirely liquefied.
4. It is helpful for a chemist to measure the melting point of a substance for several reasons. Firstly, the melting point can provide important information about the identity and purity of a compound. Secondly, it can be used to determine the suitability of a substance for a particular application, such as in the manufacturing of pharmaceuticals or the creation of specific materials.
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