Nuclei have spin if they have an odd mass number or an odd atomic number. True or false?
True
1 of 18
When a magnetic field is applied, which energy state is given to those aligned against the magnetic field?
Higher energy state - beta
2 of 18
The energy gap between alpha and beta spin states corresponds to which electromagnetic wave (60-1000 MHz)?
Radiowave
3 of 18
In compounds undergoing proton NMR, any protons attached to a heteroatom are the ones less likely to be exchanged for a deuterium atom. True or false?
False
4 of 18
What does the number of adjacent protons in 1H NMR represent?
Peak splitting pattern
5 of 18
If a proton is bound to an electronegative atom, like oxygen, there is less disruption felt in the magnetic field experienced by the proton and the group is moved to a higher ppm on a 1H NMR spectrum. True or false?
True
6 of 18
Why doesn't the size of the peak in a 13C NMR spectrum relate to the number of carbon atoms in that environment?
13C nuclei relax at different rates depending on their environment
7 of 18
Why do all peaks in 13C spectra appear as singlets?
Low abundance of 13C compared to 1H
8 of 18
Carboxylic acids produce a broad peak on IR spectra. True or false?
True
9 of 18
When an analyte is exposed to infrared light, it causes a change in the vibrational state of its bonds. Different bonds absorb different frequencies of IR light so a spectra can be obtained. True or false?
True
10 of 18
Solid state analysis cannot be used in the examination of crystals. True or false?
False
11 of 18
What is the name given to non-crystallised solids with no ordered state, making it go into solution much more easily?
Amorphous
12 of 18
What is the name given to the technique in which x-rays are fired at planes within a powder which results in a less distinct (but still regular) diffraction pattern?
X ray powder diffraction
13 of 18
Radiation in the UV-Vis region of the EM spectrum has the correct energy to excite electrons in one orbital to an orbital of a higher energy. True or false?
True
14 of 18
The Beer-Lambert law states that concentration is proportional to absorbance for a particular compound run on a particular machine. True or false?
True
15 of 18
Molecules with extended pi systems absorb UV light less strongly and at lower wavelengths. True or false?
False
16 of 18
Fluorescence is the emittance of lower energy but longer wavelength than that originally absorbed. True or false?
True
17 of 18
What is stoke's shift?
The difference in wavelength between absorption and emission
18 of 18
Other cards in this set
Card 2
Front
When a magnetic field is applied, which energy state is given to those aligned against the magnetic field?
Back
Higher energy state - beta
Card 3
Front
The energy gap between alpha and beta spin states corresponds to which electromagnetic wave (60-1000 MHz)?
Back
Card 4
Front
In compounds undergoing proton NMR, any protons attached to a heteroatom are the ones less likely to be exchanged for a deuterium atom. True or false?
Back
Card 5
Front
What does the number of adjacent protons in 1H NMR represent?
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