Infrared Spectroscopy

A molecule absorbs IR at a wavenumber of 1720 cm^-1. Which functional group could account for this absorption.

I. aldehydes

II. esters

III. alcohols

• I only

• I and II

• I, II and III

• none of the above

What part of the atom or molecule does infrared radiation affect

• the nucleus
• the electrons
• the  bonds
• the charge

Tags

NGSS.HS-PS1-4

NGSS.HS-PS4-4

The independent variable on an IR spectra is 

• wave length 
• wave number
• frequency squared
• transmission

Tags

NGSS.HS-PS4-1

The dependent variable on an IR spectra is 

• wave length 
• wave number
• frequency
• transmission

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-4

Non polar symmetrical molecules like N2 and H2

• do not absorb IR radiation
• absorb IR  radiation
• absorb the most IR  radiation
• transmit IR radiation

The finger print region is 

• above 1500 cm^-1

•  from 600 - 1500 cm^-1

• 600 - 4000 cm^-1

Stronger bonds absorb  IR at 

• higher wave numbers
• lower wave numbers
• in the finger print region
• 600cm^-1

Tags

NGSS.HS-PS1-4

NGSS.HS-PS4-4

 Mass of attached atoms affect the absorbance of the bond

• True
• False

Tags

NGSS.HS-PS1-4

A molecule has a broadband at 3200cm^-1 and sharp band at 1711cm^-1. the molecule is most likely an

• amide
• ester
• alkanol
• carboxylic acid

Tags

NGSS.HS-PS4-3

A molecule has a band at 3500cm^-1 and sharp band at 1630cm^-1. the molecule is most likely an

• amide

• ester

• alkanol

• carboxylic acid