Gas chromatography | Chemical processes | MCAT | Khan Academy
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- Опубліковано 16 вер 2013
- Understand how to separate and purify chemicals through gas chromatography and how to interpret a gas chromatogram. By Angela Guerrero. . Created by Angela Guerrero.
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I’m a chemist and use multiple GCs every day. In my line of work, we’re more interested in how MUCH of a compound is in a sample rather than trying to identify a compound. But we also do look for the presence of a compound in certain scenarios. GC is excellent for both applications.
To all you students, YES you will actually use these everyday if you go down a chemistry route. Familiarize yourselves with them. In my lab, titrations are also pretty prevalent as well as spectrometry and moisture analysis. A lot of it is automated which is a breeze, but we do manually perform some of these techniques.
Chemistry is MUCH harder in college than in the field and I know how defeated I felt at times as a student. Hang in there and stay on the path! I enjoy my job now and at 26 I made 6 figures this past year. It’s worth it, I promise!
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Tips: Really polish your resume and spend some time curating it. If you can get past that first step, then you can really shine at the interview! Before you go into the interview, look up facts about the company and familiarize yourself with it. In my interview, the first question was, “So tell us what you know about the company?” And luckily I was able to speak for a minute or so about them, which they seemed to really like. It shows that you’re invested and aren’t just going to say, “idk I just want a job.” Also, knowing someone in the field definitely helps if you have that luxury. If you’re still in school, make sure to network and stay on good terms with your professors. A recommendation can go a long way.
Oh and lastly, to my surprise, they hardly touched on chemistry in the interview. Most places just want you to have a basic knowledge/education of the field, then they’ll train you on the job the way they want. I think the only chem related question they asked me was which techniques I was familiar with. I basically just rattled off the analyses I had done in my labs (titrations, GC’s, capillary action, pH, etc.) and they essentially told me the main ones I’d be doing, and they would train me on the specific instruments. They mainly wanted to know how I work with others, if I can provide attention to detail, am I teachable, etc.
Explained a million times better than my lecturer in a fraction of the time...thank you
thanks
You're doing a marvelous job, even at making chemistry sound adorable (the baby / sumo part)!
khan academy has made my college life so much easier keep it up!
great video! before stumbling on this video i spent ages reading textbooks, but still didnt quite get GLC. but your video explained it perfectly, so thank you! :)
You saved me big time with this video. The explanation was clear and straight to the point summarized 50 textbook pages in 8min. I love u guys.
Gas chromotography was explained in a simple manner and in detail covering most of the aspects of GC.
Thank you! I knew a little bit about GLC, but never really understood the carrier gas, mobile and stationary phase. I appreciate you so much for explaining this in detail!
10+ years out of high school and I’m still using the Khan Academy!
This was sooooo easy to understand. Crisp and Clear! Thanks a ton!
Good video, but I think it would be good to mention adsorption and why it is a fundamental concept in chromatography and the separation of the mobile phase by their polarity. This would help touch more on the uniqueness of the electron distribution (like if you looked at an electrostatic electron density map) and help communicate how unique each molecule really is when looked at through the means of any system of chromatography
This is awesome (-: I always use English explanation videos for Chemistry, as in German there just aren't any videos which combine theory and "fun" (?) as much as you have with the example of the sumowrestler. Really nice, thank you. (-:
So informative and easy to understand. Thanks.
Such a friendly way of explaining, thanks a lot :)
this explanation just summed an entire part of my syllabus in only 8 minutes! Brilliant!
You literally saved my day, great explanation thank you very much!!!
The only good thing about this channel is, I always like the video before playing it, iam loving gas chromatography now 😊
thank you so mush , I hope that you explain more topics that related to the chemical engineering
Your handwriting is fancy
this was really great. Thank you :)
Excellent video. Very clear & informative. Sincere thanks.
Thank you so much !!!
I got the idea now .
Great explanation. Thank you for your video
I wish I had found your videos when I was still in college.
thank youuuu......perfect explaination.
So good. You kick ass. This made it so much easier to understand
I love your videos.
So elaborate!
Great explanation.
Simple and great explanation thanks!
Well explain! Thank you so much, I finally can understand the GC.
Thank you very much for the explanation
A good video!!! A lot better than my professor. Clear and easy to follow the logic.
Very clear, slow and steady! thanks
You're awesome... Thank you so very much
Fantastic staff my lady it's COOLSOME,I owe you one.
I can't thank you enough for this. Bless you. :D
Arunima Chakraborty I love you
really helpful thanks
Thank you! you made it so easier to fathom even for a 7 year old boy!!
Thank you!!!! u saved me !!!
awesome video..very well explained...
Ahh atlasttt i found you ... Very thankful
Thanks again!
Nice explanation. You said that sample separation in the column ( stationary phase ) is based on the boiling point & molecular size of the solutes present in the mobile phase. Actually it also depends on the polarity also.
For example
1. Polar stationary phase & polar mobile phase has more retention time
2. Polar stationary phase & non ploar mobile phase has no interaction so sample in the mobile phase moves faster, lesser retention time.
If it's not correct plz ignore my comment.
Thanks for ur superrr explaination.
amazing explanation
great explanation!
Great video!
awesome video! thank you :) x
Very helpful, thanks!
This is a great video, i'm doing a lab report about my gas chromatography and are not sure about what is actually going on for discussion sake's. Now i feel i have a better idea how to explain my data and reason it! Thanks! :)
P.S. and the girl's voice is helpful in making sure males(such as myself) are still glued to the video till the end XD
Perfect explanation!!!
loved your voice
thanks a lot.
Thank you ❤️
Absolutely great way of expanations. I coudn`t find anything better. Thanks ;)
I'm prepared for my chem lab thank you 🙏🏼
I kiss your eyes.
Thank you very much :)
You explained that so nice👍🏼
thank god this channel exist
Thank you
Thankyou. You explained very well.
very nice thank you
neat, thumbs up
Great job
Would you like to tell me what program you used in your clip?
Thanks.
Thank you for this video ;)
phenomenal
Thank you!
Great informational
Superb 👍
Thanks so much
Excellent 💜👏
excellent
You're amazing god bless you 💖💖💖💖
What about the different polarities of the mobile versus the stationary phase? The substances within the compound that have the opposite polarity of the mobile phase will have traveled slower than the the ones with the same polarity due to attraction/repulsion.
Would have liked a little more information about this.
+Zetarrino Hello. Usually, if memory does not fail me, you can NEGLECT intermolecular forces in gas phase for many purposes. So compounds having lower boiling points will just flow within the gaseous inert stream, whilst those with higher boiling points will stay liquid for longer (not necessarily interacting with the liquid stationary phase). What really matters here is that substances with higher boiling points, as long as they stay liquid, will not be able to "flow with the wind", at all. :-) Anyway, I think your question is very worthy. For example, if bigger apolar molecules are mixed with smaller polar molecules. The latter ones were supposed to boil first, but due to interaction with the stationary phase, they do not. Maybe that would invalidate the result somehow.
"flow with the
...
we will never know.
Great video :)
bless you
Thank you ma'am
wow nicely explained
Big help
GasChromatography was explained in a simple manner and in detail covering most of the aspects of GC.
I love you so much. I really do
Your voice is amazing
I used the Hewlett Packard 5710a dual-column gas chromatograph with a flame analysation detector.
What if a small compound with high boiling point and a bigger compound with low boiling point is in the mixture? Would that mean that more or less, they would travel at the same rate and will produce only 2 waves in your graph instead of 3?
nice video.like it.
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this is great!!!!!!!!
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your voice sounds so much like leighton meester's
It looks like that, in your graph, time increases toward the origin.
great simplified video ./.... i need more information for which type of substances can we use this technique for? e.g drugs and also what does the height of the peak tells us
+Aza Goodwin The height of the peak informs the intensity. The more molecules reach the detector, higher the peak.
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kindly explain of oven track in Gas chromatography
this is all theory. please, can show as some real time videos on this, any way, I appreciate your effort
That's how you do it!
Shout out to one of the best explanations. Congrats Angela, smooth and clear. Indirectly I learned that GC is very destructive and I won't have a sample afterwards
Sal Khan is Elon Musk in education! Thanks for this amazing platform
Very good video. I would have never been this good in school so easily if it wasn't for Khan Academy. Keep it up!
If my doctor asked for it could he test for my prescription drugs Cymbalta and Lamictal Respridone or and others to make sure I was taking them or to see how much of them was in my system to affect other drugs I was taking?
And, The affinity is an important factor of separation
What if it as similar boiling point and size? How can we distinguish it?