Name Laboratory Section 1. Two groups of students prepared the cow Group A isola

Question

Name Laboratory Section 1. Two groups of students prepared the cow Group A isolated a solic with a melting point of 80.5?C. Group with a melting poil of 74?77?C. When thc students consulted the chcmis have a melting point of X2C. Which group prc 2. The melting point of a solid may be J liquid phases coexist. How may you d 3. The boiling point of liqLlid is dctcrr perature when the liquid vapoi liquid up very rapidly, is he I 4. The boilirw The? If we know cot (0-90) = -tan 8, show tan(Theta-90) = -cot Theta

Explanation / Answer

1. The impurities in a compound deceases its melting point and the extent of decrease is proportional to the concentration of impurties. Therefore, the acetamide prepared by Group A is more pure as its melting point is higher than that produced by Group B.

2. Boiling point of a substance is defined as the temperature at which both liquid and its vapour phase at 1 atm pressure coexist.

3. No. He may get a boiling point higher than the actual boiling point if he heats it more rapidly. The liquid absorbs heat, just before it starts to boil, equivalent to the latent heat of vapourization, during which the temperature drops slightly. By heating the liquid rapidly, there may not be enough time for the liquid to absorb enough heat and the temperature over shoots when it boils.

4. At low pressures, the melting point of water increases slightly, but the dependence is insignificant.

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