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WorksheetsQuiz ( UV-Vis Spectroscopy )
Total questions: 8
Worksheet time: 2mins
What is the UV-Vis Spectro is used for ?
to study the conformational structure of polymer chains by comparing spectra with those of long-chain ‘‘model’’ alkanes.
to detect the chromophores of matter quantitatively and qualitatively when the matter undergoes n → π* and π → π* transition.
to determine the elemental composition of an analyte by its electromagnetic or mass spectrum.
Is it true or false ?
"molecules with no double bonds or with only one double bond do absorb in the region of UV to visible"
TRUE
FALSE
What is the light wavelength for the UV-Vis Spectroscopy ?
200 - 400 nm
400 - 800 nm
400 - 2500 nm
200 - 800 nm
Fill in the blank for the statement below,
"The _______ the conjugation, the _______ the wavelength of maximum absorption in the visible range. "
Greater ; longer
Greater ; shorter
Weaker ; longer
Weaker ; shorter
Based on Beer's Lambert Law,
what is the other name for molar absorptivity, ϵ ?
molar concentration
force constant
extinction coefficient
molar band
What is the unit of molar absorption coefficient ?
M-1 cm-1
cm M-1
M cm-1
L-1 M-1 cm-1
How to handle the cuvette ?
opaque sides are held while transparent sides are not being touched.
transparent sides are held while opaque sides are not being touched.
Held it the way you like
Why the blank solution is needed to scan first ?
To test the sensitivity of the detector.
To get the background absorption as it must be subtracted from the absorbance of the sample.
To make sure that the machine is running smoothly.
