2. (a) If you performed a melking point experiment on the same compound in San F

Question

2. (a) If you performed a melking point experiment on the same compound in San Francisco and on top of Mt. Everest, would your results differ? Explain. (b) If you performed a boiling point experiment on the same compound in San Francisco and on top of Mt. Everest, would your results differ? Explain. 3. Coeaine melts at 98 C and glucose melts at 146°C. As a chemist for the government it is your task to quickly identify the contents of three vials. One contains pure cocaine another pure glucose, and the third a mixture of cocaine and glucose. How would you accomplish your assignment? 4. Suppose you determine the melting point of cortisone (a hormone) to be 230°C. Your two neighbors obtain values of 226°C and 233°C. Why might their values differ from your value? 240-

Explanation / Answer

2)

a. Melting point is the constant temparature at which a solid changes in to liquid at constant pressure. As pressure increases the melting point decreases, this can be explained on thermodynamics ground.Melting accompanied by decrease in volume .But since liqui fills a smaller volume when it's liquid, rather than solid, it will go to a lower melting point  allowing more solid to become liquid.Thus as pressure increases solid changes to liquid at a relative lower temperature. So at mount Everest top since pressure is low on hill top melting point increases.

b)

Boiling point is temparature at which vapour pressure of liquid is equal atmospheric pressure. In the top of mount Everest pressure is low and hence liquid boils at lower temperature since vapour pressure reaches atmospheric pressure much faster.Thus on mount Everest top boiling point of liquid decreases.

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