Physics
Physics, 16.07.2019 08:00, joree

Why is it important to heat the melting point bath or block slowly and steadily when the temperature gets close to the melting point?

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Chemistry, 24.06.2019 02:00, lucerogd170
One of the most common causes of inaccurate melting points is too rapid heating of the melting point bath. under these circumstances, how will the observed melting point compare to the true melting point?
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Chemistry, 16.09.2019 18:30, 6FOOT
Show metadataprovide my evaluation of this resource in the recrytallization / melting point lab, there are a number of experimental details that need to be followed. choose whether the following statements are true or false. the melting point apparatus should not be placed in a drafty location and should be protected from the effect of the room breeze. in some melting point instruments, the sample is placed on a microscope slide which is then placed on top of a heated metal block, and the temperature of the metal block is raised until melting is observed. if the sample to be melted were placed on a microscope slide then heated, finger oils on the microscope slide will lower the melting point. a slow heating rate is necessary near the expected melting point if a mercury or alcohol thermometer is used in a melting point determination, a fractional degree reading should be possible with careful observation.
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Chemistry, 24.09.2019 17:30, omar9844
One of the most common causes of inaccurate melting points is too rapid heating of the melting point bath. under these circumstances, how ill the observed melting point compare to the true melting point.
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Chemistry, 25.10.2019 18:43, kingofthesea88
In the recrystallization/melting point lab, and in the use of a digimelt melting point apparatus, there are a number of details which should be followed in order to obtain good results. some of these are listed below. select whether each statement below is true or false ? (i)-a slow heating rate near the expected melting point gives the best result. (ii)-a too fast heating rate is likely too result in an observed melting point that is too high. (iii)-the temperature sensor is placed near the bottom of an aluminum heating block, closer to the heater than the sample, and is likely to read lower than the actual melting point of the sample. (iv)-too much sample in the capillary will cause an artificially long melting point range. (v)-you should record the temperature at which the sample first softens, then the temperature at which it completely melts, and report the melting point as the average of these two temperatures
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