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OCHEM LAB FINAL EXAM QUESTIONS WITH VERIFIED ANSWERS { GRADED A+}

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OCHEM LAB FINAL EXAM QUESTIONS WITH VERIFIED ANSWERS { GRADED A+} solubility - like dissolves like acetanilide is polar, therefore a polar solvent dissolves it Steps for choosing a good solvent: - 1. The solvent should not chemically react with your desired compound 2. the solvent sho...

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  • August 21, 2024
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  • 2024/2025
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OCHEM LAB FINAL EXAM QUESTIONS

WITH VERIFIED ANSWERS { GRADED

A+}




solubility - ✔✔like dissolves like


acetanilide is polar, therefore a polar solvent dissolves it


Steps for choosing a good solvent: - ✔✔1. The solvent should not chemically

react with your desired compound


2. the solvent should not dissolve your compound when it is cold and should

dissolve your compound when hot


3. The solvent should either dissolve impurities at all temperatures of not dissolve

the impurities at all


chromatography - ✔✔method for identification, isolation and purification; useful

for monitoring reactions

, stationary phase (polar) - ✔✔An adsorbant (eg. silica gel) is supported on a solid

back


mobile phase (nonpolar) - ✔✔A solvent mixture that carries your compound

across the stationary phase


The distance travelled.... - ✔✔depends on the polarity of the compound and the

polarity of the mobile phase (solvent)


If the mobile phase is too nonpolar, - ✔✔the compound won't travel


If the mobile phase is too polar, - ✔✔there will be too much movement


Retention factor - ✔✔distance spot traveled/distance solvent traveled


Infrared Spectroscopy - ✔✔An instrumentation method of analysis that identifies

bonds from absorption of the infrared radiation of different wavelengths


bond stretching: - ✔✔asymmetric or symmetric


Bond bending: - ✔✔twisting, wagging, rocking, or scissoring


spacial reasoning: - ✔✔the ability to generate, retain, retrieve, and transform

well-structured visual images

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