Infrared Spectroscopy Pre-lab/Objective questions PDF

Preview

Summary

Infrared Spectroscopy Objective Questions / Prelab questions...

Description

4. Turn-in Pre-Lab Assignment ± Experiment and Objectives (10 pts) You MUST turn this paper in to your TA at the start of the LAB SESSION! YOUR Name: ___________________________

Lab room: ________________

Partner Name: ___________________________

Lab time: _________________

TA Name: ____________________

Hood #: _________________

Give brief, 1- 2 sentence responses to the following questions: (1 pt.) The peaks observed in an infrared spectrum with frequencies > 1500 cm-1 correspond to vibrations of what (circle one)?  A specific functional group A d  A specific molecule (1 pt.) The crystal you will place your sample on top of to take an IR spectrum is made of what material?

Diamond Crystal (1 pts.) When taking the IR spectrum of a solid sample, what must you do to the crystal BEFORE putting them onto the IR spectrometer?

Reduce Gap Size (1 pts.) When taking the IR spectrum of a solid sample, what must you do to the crystals AFTER they have been placed onto the IR spectrometer?

Apply pressure (1 pts.) When taking the IR spectrum of a liquid sample, how many drops of liquid should you use?

One drop (1 pts.) When assigning a peak in an infrared spectrum, should you assign it to (circle one)?  A specific functional group  A pecific bond  f (1 pts.) How many peaks in an IR spectrum would you expect to see that would characterize a carboxylic acid functional group?

2 (1 pts.) How many peaks in an IR spectrum would you expect to see that would characterize an alcohol functional group?

1 (1 pts.) IR spectra can be measured by passing IR radiation through a sample or by reflecting IR radiation off a sample, which if these 2 methods will you use in your lab?

Reflecting IR radiation (1 pt.) The background scan removes what kind of artifacts in an infrared spectrum (circle one)?  IR absorptions due to atmospheric water  IR absorptions due to atmospheric carbon dioxide  Instrument artifacts  All f he abe 15...