In this video, we're going to talk about IR spectroscopy, infrared spectroscopy. We're just going to go over the science behind it, some few details, talk about the shape, intensity, wave numbers, and factors that affect the frequencies that you see here. Then we're going to talk about what signals to look at, so that you can distinguish, let's say, an alcohol from a carylic acid, or an alkane from an alkene. And then, after that, we're just going to go through a series of multiple-choice practice problems, so you can know how to look at a graph and immediately tell what functional group it represents. So we'll do that towards the end of the video. So let's go ahead and get right into it. IR spectroscopy is very useful for determining functional groups. Let's say if you have a structure or a graph in front of you, you can tell if it's a carylic acid, an ether, or an ester. Now, when a molecule absorbs infrared radiation, which is just below red light under the visible spectrum, it causes molecular vibrations. The molecule can stretch, compress, or even bend when it absorbs IR radiation. Now, in this graph, on the y-axis, you have percent transmittance and the number increases from 0% all the way to 100%. Now, transmittance is the amount of light energy that passes through the sample. So if you look at this signal here, let's estimate that the percent transmittance is around 80%. That means that 20% of that energy was absorbed, and 80% passed through the sample. Now, if you look at this signal here, let's say it's at 10%. So, if 10% was transmitted through the sample, 90% was absorbed. So that's the relationship between absorbance and transmittance, inversely related. On the x-axis, you have what...
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2016 IRS 940 Form: What You Should Know
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