The [A] is the [B] of temperature starting where a crystal first begins to melt

Question

The [A] is the [B] of temperature starting where a crystal first begins to melt and ending when the sample is fully [C] When determining a melting point, you should heat to [A] to within [B] of the expected melting point and then slow the rate of heating to [C] [A] is the process of dissolving an impure sample in a solvent, using a [B] to transfer the sample to a different solvent, precipitating, and vacuum filtering the purified sample using a [C] [A] involves dissolving a purified sample in heated solvent to form a [B] allowing the solution to cool, and recovering purified [C]. Compounds which share the same [A] but have different [B] are known as [C] Compounds such as n-propanol and iso-propanol, are [A] isomers, differing only in the [B] of their bonds. Isomers that differ only by how their atoms are arranged in [A]. and are otherwise identical are known as [B] Stereoisomers that form non-superimposable [A] of each other are called [B];all other stereoisomers are called [C] [A] designators assigned according to atom priority, [B] assign priorities in a clockwise fashion while [C] assign priorites in an anti-clockwise fashion. Stereoisomers having at least 2 chiral centers and are not [A] active are called [B] compounds;these compounds have a plane of [C] within them.

Explanation / Answer

1. The Melting Point is the Fixed Value of temperature starting where a crystal first begins to melt and ending when the sample is fully Liquid.

   Explanation: For a crystalline solid the melting point has a fixed value where as in case of an amorphous solid there will be a range of temperature. The temperature during any phase change remains fixed for a crystalline substance as the heat supplied to the material is utilized as the latent heat of phase transformation.

2. When determining a melting point, you should heat Crystal to within 10 o of the expected me;lting point and then slow the rate of heating to Exact Melting Point.

   Explanation: This precaution is taken so that the actual melting point is not missed due to over heating.

3. Solvent Extraction is the process of dissolving an impure sample in a solvent, using a Separating Funnel to transfer the sample to a different solvent, precipitating and vacuum filtering the purified sample using a Buchener Funnel.

   Explanation: This protocol is useful only when the impurities are soluble in a different solvent than the sample and the solvents are immiscible in any proportion.

4. Crystallization involves dissolving a purified sample in heated solvent to form a Saturated Solution, allowing the solution to cool and recovering purified Crystal.

   Explanation: The principle of this purification is change in solubility with temperature. As the temperature drops down the solubility also falls down and crystallization takes place.

5. Compounds which share the same Molecular Formula but have different Molecular Structure are known as Isomers.

   Explanation: CH3-CH2-OH and CH3-O-CH3 both the molecules have the molecular formula C2H6O, but due to difference in molecular structure these are isomers.

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