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Chem 219b Lab Final questions and answers
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  • Chem&219
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  • Chem&219

• Typical NMR chemical shift for methyl protons adjacent to a ketone 2.1-2.6 ppm • Level of solvent on a TLC plate Below the spots when first placed in the developing jar, and then it will eventually rise to the top past the spots Previous Play Next Rewind 10 seconds Move ...

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  • September 13, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • chem 219b lab final questions and answers

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  • Chem&219
  • Chem&219

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Chem 219b Lab Final questions
and answers

Valence
the number of bonds an atom will form to fill its outer shell
Ionic bonds
complete transfer of one ore more valence electrons from one atom
to another
Previous
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Move forward 10 seconds
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Cation
negatively charged electron loses electron and becomes positive
Anion
atom receiving electrons becomes negatively charged
Ion
posses a non-zero electrical charge
Covalent bonds

, formed by the sharing of electrons between elements with little or
no difference
Diatomic elements
Bond strength
Bond length
• Typical NMR chemical shift for methyl protons adjacent to a ketone
- answer 2.1-2.6 ppm


• Level of solvent on a TLC plate - answer Below the spots when first
placed in the developing jar, and then it will eventually rise to the
top past the spots


Column Chromatography - answer Provides a method for the
separation and isolation of individual components of a mixture


• Stationary phase in column chromatography - answer Silica
gel/adsorbent


• Mobile phase in column chromatography - answer Eluent/ the
solvent


• Polarity in column chromatography - answer All compounds move
down a column in polar solvent but in a non-polar solvent, only a
non-polar solute will move with the solvent


• Glass wool in column chromatography - answer Mobile phase
would not be able to travel all the way through and out of the
column


Petroleum Ether - answer Non-polar compound that would not
separate polar components in column chromatography

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