Analytical techniques

In mass spectrometry, what is the charge on an ion formed?

• +1

• -1

• +2

• -2

What are the steps of operation in the mass spectrometer?

• Accelerate, Deflect,Ionize, Detect
• Deflect,Ionize, Accelerate, Detect
• Ionize, Accelerate, Deflect, Detect
• Detect, Accelerate, Deflect, Ionize

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What substance does this mass spectra represent?

• hexane

• pentane

• butane

• pentene

A molecule absorbs IR at a wavenumber of 1720 cm^-1.  Which functional group could account for this absorption.
I. aldehydes
II. esters
III. ethers

• I only
• I and II 
• I, II and III 
• none of the above

Tags

NGSS.HS-PS4-4

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

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

The mobile phase in paper chromatography is typically a

• plasma
• solid
• gas
• liquid

Separation in GC occurs in the ____

• Gas tank

• Oven

• Detector

• Column

A low retention time indicates

• a high affinity to the mobile phase
• a low affinity to the stationary phase
• a high solubility in the mobile phase
• all of the above

Which of these compounds is taken as standard for recording chemical shift?

• Dimethylsilane

• Trimethylsilane

• Tetramethylsilane

• Methylsilane