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UV-Visible Spectroscopy and Vibrational Energy Levels Quiz

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UV-Visible Spectroscopy and Vibrational Energy Levels Quiz

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Questions and Answers

What property of a solution is the decrease in the intensity of radiation through it directly proportional to according to Beer's Law?

Color of the solution

Density of the solution

Thickness of the solution (correct)

Temperature of the solution

What do Beer's Law and Lambert's Law combined state about the absorption of light in a solution?

Absorbance is inversely proportional to concentration and thickness

Absorbance is proportional to concentration and thickness (correct)

Absorbance has no relation to concentration or thickness

Absorbance is only dependent on concentration

What does 'A' represent in the Beer-Lambert Law equation A=εcɭ?

Amplitude

Atomic number

Angle of incidence

Absorbance (correct)

In UV-Visible spectroscopy, which region extends from 10 nm to 400 nm?

UV radiation region Signup and view all the answers

What type of electronic transition involves σ electron from an orbital being excited to a corresponding antibonding orbital?

σ → σ* transition Signup and view all the answers

For which molecule does a σ → σ* transition show absorbance maxima at 125 nm?

Methane (CH₄) Signup and view all the answers

What is the primary purpose of UV absorption spectroscopy in detecting impurities in organic molecules?

Detecting additional peaks due to the impurities Signup and view all the answers

How does UV spectroscopy aid in the structure elucidation of organic compounds?

By analyzing the location and combination of peaks Signup and view all the answers

What does UV spectroscopy help determine about organic molecules concerning unsaturation and hetero atoms?

The presence or absence of unsaturation and hetero atoms Signup and view all the answers

In UV absorption spectroscopy, what can be inferred about a compound if multiple peaks are observed in the spectrum?

The compound contains impurities Signup and view all the answers

How can UV spectroscopy help in quantitative analysis?

By comparing absorbance at specific wavelengths Signup and view all the answers

What role does UV-visible spectroscopy play in identifying impurities compared to standard raw material?

Comparing additional peaks present in the sample Signup and view all the answers

How does UV-visible spectroscopy aid in the detection of impurities over traditional methods?

By detecting additional peaks due to impurities Signup and view all the answers

What information can be derived from UV-visible spectroscopy regarding hetero atoms in organic compounds?

The presence or absence of hetero atoms Signup and view all the answers

How does UV-visible spectroscopy contribute to qualitative analysis in chemistry?

By identifying functional groups and structures Signup and view all the answers

What advantage does UV-visible spectroscopy offer in analyzing organic compounds over traditional methods?

A more rapid and non-destructive analysis process Signup and view all the answers