Lab Midterm Second Semester Flashcards
4 essential parts of an NMR Spectrometer
a strong magnet, a radiofrequency oscillator, a radiofrequency detector, and a computer to process the data.
What nuclei can be detected by NMR?
Nuclei with an odd atomic number, an odd mass number, or both.
What happens to a nucleus when it interacts with RF radiation?
the nucleus reorients itself to align with the magnetic field created by the RF.
What happens to a molecule when it interacts with IR radiation?
CHECK IPAD NOTES?
What chemical are the plates used in IR spec made of?
CHECK IPAD NOTES?
What happens to a molecule when it is bombarded by a beam of high energy electrons?
CHECK IPAD NOTES?
What happens to the electrons in a conjugated molecule when it absorbs ultraviolet radiation?
a pi electron is promoted from the highest occupied molecular orbital to the lowest unoccupied molecular orbital
How do you know if a compound contains an odd number of nitrogen atoms based on Mass Spec?
if M+ is an odd number
How do you know if a compound contains bromine based on Mass Spec?
the M+2 peak is almost as large as the M+ peak
How do you know if a compound contains chlorine based on Mass Spec?
the M+2 peak is 1/3 as large as the M+ peak
How do you know if a compound contains iodine based on Mass Spec?
there is no M+2 peak, but there is an I+ peak at 127
