1. In this organic chemistry lab, why do we determine meiting points? A. It prov
ID: 1086567 • Letter: 1
Question
1. In this organic chemistry lab, why do we determine meiting points? A. It provides information about the polarity of a sample B. It provides information for the amount of sample needed for a reaction. C. It helps to determine the purity or identity of a sample. D. It helps to determine the amount of surface tension in a sample 2. What is the "eutectic point"? A. The highest melting point of a mixture of two different compounds. B. The lowest melting point of a mixture of two different compounds. C. The temperature that the sample turns to a gas. D. The temperature that two compounds react 3. Fill in the blank. The melting point of a compound is a property. A. refractive index B, chemical C. eutectic compos tion D. physical 4 Why does an impurity broaden a "melting range? A. The impurity creates heat 8. The impurity disrupts the polarity of the sample. C. The impurity disrupts the molecular interactions in different areas of the sample. D. It creates slower heating of the sample to prevent air packets. S. Why shouldn't you reuse a sample that was previously melted, even though it has salidified again? A. The sample needs time to ccol down B. Some of the sample may have decomposed at or near the melting point C. The sample may have reacted D, Air pockets in the sample may make it explosiveExplanation / Answer
1) ans is c, it determine the purity or identiTy of a sample, because a pure crystalline compound usally possesses a sharp melting point
2)ans is a because, the temp at which a particular eutectic mixture freezes or melt
3)melting point is an important physical property of a comp. The melting point can be used to identify a substance nd identify purity
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