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Q: Why do peaks in IR are negative?
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How do you detect a carboxylic acid?

Use an IR spectrophotometer, then check the peaks. :)


Why IR spectrum peaks come down?

In IR spectrum we take percent transmittence on vertical axis and wavelength on horizontal axis, so the peaks come down i.e more the certain wavelength of IR have been absorbed more deep will be the peak that is less amount of light of that wavelength was transmitted.


What are the FT-IR peaks of a carbonyl group and a cyanol group?

OMG that's confusing.... OMG that's confusing....


What part of the electromagnetic spectrum contains the majority of the suns rays?

IR, visible, UV. Our sun's radiation peaks in the yellow portion of the spectrum.


What are negative prefixes?

un- in- ir- non- anti- counter- contra-


Is CO2 is IR active?

Yes, CO2 is IR active, both C=O bonds are not neceserrily symmetric in their vibration / bending. IR regions: 700 cm-1, 2340 cm-1, 2360 cm-1, although it is to be expected that peaks are weak, unless you forgot to insert a sample!


What are the principle peaks in an IR spectra for benzoic acid?

Carbonyl around 1700 Carboxylic acid OH 2400-3000 C=C aromatic at 1600 & 1475


Why is the intelligence signal not in the AM envelope?

The intelligence signal is in the AM envelope.In AM modulation, the carrier is amplitude modulated by the signal. This signal appears as the envelope of the carrier. You can demodulate it by following the peaks on each cycle of the carrier. You can either follow the positive peaks or the negative peaks - it does not matter if the original modulation is symmetrical.


What is Rectified EMG?

Rectified EMG is EMG where the negative peaks are made positive. In Matlab: rectified_emg = abs(emg).


Can integers be positive?

Yes, integers can be positive! An integer is basically any whole number, positive ir negative!


Is smart a negative or positive or neutral connotation?

I was pretty sure it was positive. However, according to Edge 2020, it is negative.


What is the IR peak of SiC using FT IR spectroscopy?

The Si-CH3 peak is typically a strong & sharp peak @ 1250 +/- 10 cm-1. Other examples of silicone peaks are as follows: Si-H (silane) @ 2100-2360 cm-1 and Si-O @ 1000-1110 cm-1 (could have a shoulder).