Chemical Analysis

002 - Chemical Analysis

In this video Paul Andersen explains how chemical analysis is important in determining the composition, purity and empirical formula of a compound. An empirical formula determination problem is also included.

Music Attribution
Title: String Theory
Artist: Herman Jolly

All of the images are licensed under creative commons and public domain licensing:

[noellebarnes]

I'm studying this summer in advance for my ap chemistry class next year and I've yet to find a set of videos that explain the concepts that are covered better than you! excited to binge watch this whole playlist XD

[hientruonght]

I am a high school student from sweden and I am currently in my second year in the natural science program (11th grade). Just wanted to say thank you for making such helpful videos!

[hippiemuslim]

I'm a biochemistry student so I know most the lessons, but I love how you explain them. I have been watching your videos for a time and I think you are a great teacher. Thank you.

[runatee]

When you're trying to find an empirical formula, you have to divide all of the values by the lowest number of moles (which in this case is 5.11). After that you get the 1, 1.33, and 1. You're supposed to write out the empirical formula based on those three values, but you can't write CH1.33O, so you multiply by a number that will make that irregular 1.33 a whole number for your empirical formula.

[youarethecauseofmyeuphoria]

It’s 2022 and your video is still saving my life. Thank you so much Mr. Andersen! I have AP chemistry coming up next week and I’m very scared because I don’t know anything, but I think I’ll gain better understanding from your videos. You explained it so so well🙏🙏

[rachelwalton]

Thanks Paul, this is really, really well explained. I finally get this! I've been trying to understand moles for about 6 weeks and your video made me get it. Thank you so much for this, very much appreciate your lessons :-)

[camelslovejulz]

i was having so much trouble with moles, you seriously helped me out, thanks

[jessicachan]

OKKKK, be honest, @0:26ish when Bozeman moved to see if the eyes on the painting were following, you did the same. (Y)

[berni]

I allways loved chemical analysis, but you make me feel like the first time I saw this on school. Thank you :')

[DonCarlos]

Very nice ! Gave me hope that i wont always need to use reference material to identify compositions.

[yukitiew]

Thank you for the enlightenment! It was definitely better than my chem tr. explaination :)

[marinaoliveira]

I feel a lot more confident on my test now!

[quangpham]

Thank you so much, sir. Your videos are great

[Verradonairun]

Two questions:
1) at 5:20 - did you divide by 5.11 because this was the lowest number of moles of any of the constituent elements? So if the value for oxygen were 1.05 moles, then you'd divide all the numbers by 1.05?
2) 5:42 - when you say that the mass spectrometer can't be used to determine precisely whether you're dealing with C3H4O3 or C6H8O6, would this then be determined later via a precise density measurement? My guess is that equal volumes of these two compounds would differ in mass by a factor of 2.

[queena]

my second year in college and I finally understood what a mole actually is and what it means 😓

[chemistryclassroom]

It's really good. I have learnt a lot

[quetzallium]

Anyone else notice that the first letter of the elements in the analysis section spelled "CHOMP"?

[watermelonn]

Could you please make a video on relative reaction rates please? OCR a2 syllabus?

[ZVIKAGREENBERG]

Hi to Paul Andersen - I saw that the first video on chemistry was translated. But the second one not yet. I''d like to translate your videos - do I need a certain permission?

[angelfire]

Tyler DeWitt is a better chemistry teacher, in fact, hes the best one out there, go search him up hes awesome. He makes everything so easily understandable in CHEMISTRY! He made me pass my chemistry class