A melting point range: a. begins at the temperature at which the first droplet o

Question

A melting point range: a. begins at the temperature at which the first droplet of liquid is observed in the solid sample and ends at the temperature at which the sample becomes a clear liquid b. begins at the temperature at which the first droplet of liquid is observed in the solid sample and ends at the temperature at which the sample begins to boil c. begins at the temperature at which the solid sample becomes a clear liquid and ends at the temperature at which it begins to boil d. begins at the temperature at which the solid sample begins to melt and ends when it decomposes Extremely pure organic compounds have melting points that a. exhibit a very narrow temperature range, or no range at all b. exhibit a wide temperature range c. vary depending on the amount of substance tested d. none of the above. A molecule is said to be___ if its mirror image is not identical to it. A molecule that is_ has a mirror image that is identical to it. Refluxing is defined as: a. The process of continuous boiling, vaporization, cooling, and return of condensate b. Filtering crystals from the solution c. Washing the crystals with a little cold solvent to remove the mother liquor d. None of the above To___ insoluble impurities and decolorizing charcoal, it is necessary to____ the solution while it is____. e. Vacuum; rinse; dry f. Heat; filter, wet g. Remove: filter: hot h. Dry; vacuum: hot When a compound contains an impurity, its melting point will be a. higher than the melting point for the pure compound b. lower than the melting point for the pure compound c. the same as the melting point for the pure compound d. higher or lower than the melting point for the pure compound, depending on the compound

Explanation / Answer

1. answer : a

melting point range is the temperature where the sample starts to melt to the point where the sample is completely melted

2. pure compounds have narrow melting point range

3. asymmetric

4. a molecule that is achiral has a super imposable mirror image

5. none of the above .

refluxing is boiling

6. answer is (g ) remove, filter , hot

7.answer : b. Impurities decreases the melting point.

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