Question
In: Chemistry
1. What is the chemical shift (in ppm) for a 460 Hz signal in a 200...
1. What is the chemical shift (in ppm) for a 460 Hz signal in a 200 MHz NMR?
2. Explain why rearrangements sometimes occur in addition reactions of HBr to alkenes.
Solutions
queen_honey_blossom answered 2 years agoRelated Solutions
Tetramethylsilane (TMS) is the accepted internal standard for calibrating chemical shift ppm values for 1H, 13C,...
Tetramethylsilane (TMS) is the accepted internal standard for
calibrating chemical shift ppm values for 1H, 13C, and 29Si NMR
spectroscopy in organic solvents.
In 1H-NMR, the TMS peak is assigned 0 ppm. This is upfield of
most proton peaks observed for organic compounds. Briefly explain
why the protons in TMS appear at this upfield location in a 1H-NMR
spectrum.
Considering the range of hertz values possible for a
spectrometer, why is the ppm scale used? To what does the ppm...
1. What would be the maximum concentration of Toluene (PEL 200 ppm) that an atmosphere could...
1. What would be the maximum concentration of Toluene (PEL 200
ppm) that an atmosphere could contain if your air purifying
respirator has been tested with the following results: mask
concentration of nontoxic gas 10 ppm.
2. A respirator cartridge that has an orange stripe on a black
label would indicate use in what situation?
please type answer. some are written on paper and are hard to
read
1. Generate a sine wave with frequency 100 Hz. a. Sample the signal with a sampling...
1. Generate a sine wave with frequency 100 Hz.
a. Sample the signal with a sampling frequency (i) 1000 Hz and
(ii) 1050 Hz.
b. For each frequency in Question 1(a), perform
DFT for ONE (1) cycle and ONE and a HALF
(1.5) cycles of the waveform. Comment on your
observation.
In matlab using a RC low pass filter Create a 1 Hz input signal (with amplitude...
In
matlab using a RC low pass filter Create a 1 Hz input signal (with
amplitude of one). Corrupt the input signal with signals greater
than or equal to 100 Hz and/or random noise. Use
randn(length(v_in,1)) to test filter
A plot of detector signal versus ppm Ca2+ yielded a best fit straight line with a...
A plot of detector signal versus ppm Ca2+ yielded a
best fit straight line with a slope of 1.38 volts/ppm. Multiple
blank measurements resulted in a standard deviation of 0.18 volts.
Using a 2:1 signal-to-noise ratio criteria, calculate the detection
limit for Ca2+ in ppm when this method is employed.
Thanks!
A plot of detector signal versus ppm Ca2+ yielded a best fit straight line with a...
A plot of detector signal versus ppm Ca2+ yielded a best fit
straight line with a slope of 0.13 volts/ppm. Multiple blank
measurements resulted in a standard deviation of 0.18 volts. Using
a 2:1 signal-to-noise ratio criteria, calculate the detection limit
for Ca2+ in ppm when this method is employed.
What is the relationship between chemical shift and electron environment in proton NMR?
What is the relationship between chemical shift and electron
environment in proton NMR?
An analog signal, bandlimited to 20 Hz is corrupted by high-frequency noise. The spectrum of the...
An analog signal, bandlimited to 20 Hz is corrupted by
high-frequency noise. The spectrum of the noise is from 25 Hz to 35
Hz. The noisy analog signal is sampled at 60 Hz. A digital lowpass
filter is to be designed so as to remove the noise from the signal.
Find the desired frequency response.
Assume that you have a clock signal with frequency of 50 Hz, and you want to...
Assume that you have a clock signal with frequency of 50 Hz, and
you want to divide this signal into a frequency of 1 Hz signal. The
counter chips you must use are synchronous decade (MOD 10) counter
chips 74160 and synchronous MOD 16 counter chips 74161. Please use
the back side of this paper to draw your circuit diagram with all
the details.
You can use counter frequency division method to step down a
higher frequency signal to a...
Generate a signal composed of two square waves, the first has a 14 Hz and the...
Generate a signal composed of two square waves, the first has a
14 Hz and the second has a 55 Hz frequency. Both waves are sampled
at 2 kHz for 200 ms. Duty cycle for the first wave is 40% while the
second’s is 35%. Show the signal with and without adding white
Gaussian noise with a variance of 1/100 in matlab
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