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Beer's Law
Рет қаралды 173,502
Күн бұрынWatch more videos on www.brightstorm...
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@amanda_taug 5 жыл бұрын
Thank god she is talking faster than most ppl on KZfaq!! I always have to set it at 1.5 speed bc most ppl talk too slow!!
@kevinh5349 2 жыл бұрын
And this one has to be put on x0.75.
@gustavseeberg8824 8 жыл бұрын
I personally recommend setting the pace on this video to 0.5
@jalenruiz7079 8 жыл бұрын
+Gustav Seeberg XD she sounds like a drunk fake chemist
@Feibulous 7 жыл бұрын
Yea... she talks quite fast... lol
@jvstAsYouAre 6 жыл бұрын
0.75 actually sounds normal
@damongeo840 5 жыл бұрын
This lesson despite all of the mistakes is actually very helpful! The way she explains the Beer's law is just so simple and amazing because it demystifies the whole concept to an earthy dimension.
@fergusglen-lee5457 6 жыл бұрын
in 25 seconds you explained it better than any of the profs at my uni, thank you!
@ketzbook 5 жыл бұрын
Hi, I normally like your videos, but this one has a couple of mistakes. 1:02 the light actually travels from the source to the diode array (opposite what you said) 1:26 Absorbance is NOT a percent. A = 0.43 is not absorbing 43% of the light. Instead, absorbance is logarithmically related to % transmittance. A = 2 - log(%T)
@damongeo840 5 жыл бұрын
Actually, doing the math: T= 10^(-A)= 0.37 (The light that is transmitted) then the rest is 1-0.37= 0.63= 63 %, that is the percentage of the absorbed light.
@Kevinfreddo 6 жыл бұрын
Literally the first 10 seconds of the video perfectly described what my chemistry teacher couldn't. That's sad, she said only a few sentences.
@Moss9100 9 жыл бұрын
Baby slow down. I have exam tomorrow
@jackdawson3887 9 жыл бұрын
hahaha......nice!!:)
@okungbowaswag 6 жыл бұрын
DZO Hams 😂😂😂😂😂
@ericpoloway6909 5 жыл бұрын
She was nervous... duh!
@camia220 4 жыл бұрын
😂😂😂😂
@hara8817 9 жыл бұрын
Transmittance can be indicated as %T but absorbance is not. Absorbance is a log function of T. Absorbance of 0.43 is not 43% absorbance.
@nasyajohan7243 6 жыл бұрын
isn't it the same? 43% means 43/100 and 43 divide by hundred gives 0.43
@damongeo840 5 жыл бұрын
@@nasyajohan7243 That is right, but it doesn't mean that 43 % of the light is absorbed - stated at 1:26. Actually, doing the math: T= 10^(-A)= 0.37 (The light that is transmitted) then the rest is 1-0.37= 0.63= 63 %, that is the percentage of the absorbed light.
@chantellehollingsworthplow4695 7 жыл бұрын
Wow, you just made an Beer's law simple. Thank you.
@ericpoloway6909 5 жыл бұрын
Thank you for an accurate depiction of Beer's Law in a vary human manner. nice job not reacting to the cap falling off.
@Postcalculus 11 жыл бұрын
It's good she speaks fast, as long as there is clarity. Good work.
@pinkbunneh1sarah 8 жыл бұрын
what is a=ebc than???
@parthanmanisekaran9608 7 жыл бұрын
well its a=etc where a is the absorbance , e is the molar attenuation constant, t is the thickness or path length of the material sample and c is the concentration of the attenuating species in the material sample
@supersurfergirl1549 5 жыл бұрын
As parthan said, A=absorbance; e=molar absorptivity constant (its different for every element); and c=distance the light has traveled (if you're working with a cuvette then c=1cm) I'm still working on how to use it.
@damongeo840 5 жыл бұрын
It is the same thing: a=ε*l*C C/a=1/(ε*l). ε is a constant and "l" is fixed for a given cell. Therefore 1/(ε*l) is fixed. As long as the Beer's law apply, the ratio for every concentration and its respective absorption is fixed and equals 1/(ε*l). She presents it straightforwardly.
@karankapoor5927 8 жыл бұрын
Thanks Mam for this video. Thank you so much.
@Onisasu 13 жыл бұрын
thanks for the quick and helpful video! :)
@AVAlovelovelove 8 жыл бұрын
this video really helped me so thank you! you did seem a little nervous, which is understandable, but portray that confidence because you know your stuff! (:
@dbf72829 3 жыл бұрын
Wow 4yrars where are you now? Idk where I'll be in 4 years?
@luxe1414 8 жыл бұрын
YASSSSS THANK YOU SO SIMPLE...THANK YOU
@kelvinmacharia8026 4 жыл бұрын
Thank You !!
@Jerusalem83 11 жыл бұрын
Thank you so much. You truly helped me in understanding how to approach my question.
@MadcapClover 12 жыл бұрын
Amazing, I have my lab exam in 2 days and this helped me out ! :) Thanks so much :)
@chemistmcg 13 жыл бұрын
You explained your instrumental diagram backwards. the diode array detects the transmittance of light through your sample.
@jenniferthedrummer6078 7 жыл бұрын
Awesome thanks and she kinda sounded like Kristen wiig which made it fun lol
@VyvienneEaux 5 жыл бұрын
Oh, so you mean that you have two different types of beer in those graduated cylinders! I get it now!
@kathys254 4 жыл бұрын
No calibration plot shown?
@kourosh61 7 жыл бұрын
Absorption 0.43 does not mean the solution absorbs 43% of the light. Absorbance is a logarithmic function of transmittance. A= -Log T -> T= 10^-A -> T= 10^-0.43 -> T= 9.57% -> 90.43% of incident light is absorbed.
@mahmoudmasoud3088 11 жыл бұрын
thank you
@gabriellaureano2570 9 жыл бұрын
Bless you child
@fakyew888 12 жыл бұрын
when do we learn about this in chem?
@1Camilleri 13 жыл бұрын
Very good - the fast talking's good
@munyaradzimuchedzi1189 9 жыл бұрын
A 0.12M solution of a compound A had an absorbance of 0.624 at 238 nm in a 1 cubic cm cuvet.find the molar absorptivity of A.....nid ans
@SalmanMoyeen 11 жыл бұрын
Can you please tell me how to convert % to decimal point?
@dkreller01 12 жыл бұрын
I agree with kiplantt. You were saying one thing but the diagram was the very opposite. I was almost going to use this in class until I saw this blunder. Thanks though. You have the basis of a good video. Just fix these small things and re-post!
@peterpelayo1456 9 жыл бұрын
You didn't talk fast enough. J/k. Great video, thanks.
@TheCola90 12 жыл бұрын
Very good fast talking made me know the case better and faster ... :)
@dkreller01 12 жыл бұрын
Technically incorrect. An absorbance of 0.43 does not mean the solution absorbs 43% of the light. I hope this video has not negatively impacted too many students who accept what you say as the truth. Take this video off the web. Fix it and re-post because there are many good aspects to it.
@dbf72829 3 жыл бұрын
News flash no one gives a crap about your channel or your knowledge bye bye loser
@codygruberg7294 6 жыл бұрын
she sounded like she had ants biting her the whole time
@Brian86992DH 11 жыл бұрын
These are not the cat videos I was looking for.
@iam23years3old 11 жыл бұрын
so does that mean that the spectrophotometer absorbs 43% of the light?
@bernarddoherty4014 5 жыл бұрын
Love it when she says 'this guy is darker" as she strokes the vial! Lol.
@dhanrajnakade3325 11 жыл бұрын
Nice excellent
@ezrasanmiguel9472 4 жыл бұрын
Damn girl she all over the place
@joule-trix 7 жыл бұрын
mannn i got church tommarow
@ull893 12 жыл бұрын
Next time keep an oxygen tank next to you, in case run out of breath..!!
@yberrios6 11 жыл бұрын
S L O W D O W N ! ! ! ! ! ! !
@Ahmed-tu3ms 6 жыл бұрын
x0.5
@jbarah05 13 жыл бұрын
BREATH!!!!!! Mother of god that was quick I didn't even understand one thing u said
@oyinkana8644 11 жыл бұрын
lol
@Zak.f 10 жыл бұрын
Breath! Talk too fast!
@ankurpatel66 11 жыл бұрын
OooooooooooooooouuuuHHHHH
@matthewpiper171 7 жыл бұрын
She talked like she didn't have enough time and was nervous. Well I'm here saying you are really smart and slow it down a bit.
@marcotremblay5304 11 жыл бұрын
zoooom
@reykjaviktotoronto186 7 жыл бұрын
dont be hard on her. she had to run home to watch the bachelorette
@dbf72829 3 жыл бұрын
Moron unemployed bastard
@chizoioioi 6 жыл бұрын
I like her talking fast too many vids linger on unimportant details
@lychee159 13 жыл бұрын
too fast... i can barely grasp whats you're saying....
@alaabuhagaar 10 жыл бұрын
good work . but in the next time try to slowdown
@MrThelovechannel 5 жыл бұрын
She's explaining this like she just learned the material and was told to make a presentation to teach the class. All stuttering on words, slow TF down! We're trying to process this new concept and talking fast is clearly not working for either of us
@kevinh5349 2 жыл бұрын
Sheesh. Slow down. Come up for air now and then. I put it on x0.75 speed to make it tolerable.
@engkelvin7600 4 жыл бұрын
What the f 😂😂. Are you talking to yourself?
@DissectionLabBio103 11 жыл бұрын
Your are speaking way to fast to be introducing a concept.
@stephaniedeluna9727 3 жыл бұрын
Talks too too fast
@minghaoli2991 5 жыл бұрын
Why do you talk so fast when you are choking on your own words? Slow down!
@MrUnladenswallow 11 жыл бұрын
you are talking absolute crap woman! talking fast does not make up for this. For god sake if your going to make a video make sure you get your information from the right sources
@UsmanUzbek 11 жыл бұрын
you talk too fast and the way you do it is not right can you plzzzz speak slower so we can understand you
@alliswell7740 4 жыл бұрын
Very bad
@oyinkana8644 11 жыл бұрын
u talk to fast like omgggggggggggg slow down
@Natty4Life 8 жыл бұрын
She can't even explain what she is saying, she is tripping over her words because she is talking so quick.
@dbf72829 3 жыл бұрын
You know anything I don't think so! Unemployed bastard
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