Chemistry

Chemistry, 24.10.2019 16:43, reecedstceklein

If a sample contains impurities, its melting point will be than a pure sample.

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Chemistry, 12.07.2019 04:40, aiyanahill9218

Acompound has a known melting point of 210 °c – 211 °c when pure. you are given a sample of the compound and peform a melting point analysis. the melting point of the sample is 204 °c – 208 °c. what does this result tell you? (

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Physics, 14.07.2019 03:10, shyshy1791

When performing a melting point on a solid compound, 2 melting point determinations were made. one sample, which was 1 mm in height in the capillary, possessed a melting point of 250-251°c. the other sample was 25 mm in height. what would you expect the approximate melting point to be for this 25 mm sample, if the heating rate for both samples was 2 degrees per minute? (hint: use algebra to solve the mp range) 4. 5. for the same solid compound as the question above, if the 1 mm sample was heated at 15 per minute on a gallenkamp melting point apparatus, what would you expect for an approximate melting point? (algebra may be used again! )

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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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Chemistry, 29.10.2019 06:31, rosenthaljaneiah2010

In a synthesis experiment you obtain a sample of product on which you do a melting point determination and find a melting point range of 108.0 to 114.3 degrees celsius. the sample is supposed to be benzoic acid. what preliminary conclusion(s) can you reach from this one determination? (select true or false) 1) the sample is probably impure. 2) the sample is not benzoic acid 3) the melting point determination may need improvement -- it may not have been done properly, and make sure it was repeated at least once. 5) the sample probably needs recrystallization. 6) the sample may be benzoic acid.

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