Lab Techniques & Safety: Crash Course Chemistry #21
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- Опубліковано 27 чер 2024
- Hank takes a break from the desk to bring you to the lab in order to demonstrate some important points about the practical side of chemistry - experimentation in the laboratory. You'll learn what to wear in the lab, how to dispose of chemicals safely, how to avoid the most common accidents, how to pour solutions properly, what the HazMat diamond means, what an MSDS is, and how to use a fume hood. And as a reward for sticking with him through this maybe less-than-thrilling lecture, you'll see Hank subject himself to an exciting piece of safety apparatus.
Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: apple.co/3d4eyZo
Download it here for Android Devices: bit.ly/2SrDulJ
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Table of Contents
Proper Lab Attire 0:51
Disposing Chemicals Safely 6:30
Avoiding Common Lab Accidents 5:40
Proper Pouring 5:19
Hazmat Diamond 2:26
MSDS 3:05
How to use Fume Hoods 3:38
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Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: apple.co/3d4eyZo
Download it here for Android Devices: bit.ly/2SrDulJ
I always wanted to see one of those showers in action.
there was surprisingly not as much water as i expected
I've watched a lot of Hank Green videos.
A lot.
And I've never seen him so happy or so excited as when talking about lab safety.
Like so many videos.
I once dropped a crucible full of some chemical that was reacting in it (I have a really shaky grip) and it burnt a hole through the table.
My Chem teacher started calling me 'Danger Girl' after that 😭
Awe lol that is a little bit funny but its good you didnt get any on you. +Tanya Y
lol danger girl is a cool title tho :D
lol
Like Danger Mouse
You go gurrrrl
heres a heart
This is so much better than that 80s safety video
Also, WHY IS THE EMERGENCY SHOWER NEXT TO A BUNCH OF PLUGGED IN ELECTRONICS?! o.O
good point
Small note, if you do happen to need to pour something slowly, don't hesitate to use a glass rod to help you in not dribbling it down the side of the container.
Put the glass rod in the thing you are pouring into and pour the liquid down the side of the glass rod and it will guide the liquid where it needs to go, overcoming the surface tension in the process. Particularly good for liquids that adhere to glass, like Water and anything dissolved in that water.
Chemistry life hacks.... 😂
Why oh why can't they show this in schools instead of the ridiculous video they show now?
this showed up today in my intro to engineering tech class
they just showed this at my school
I'm so jealous lukassnakeman michael benzur The one they show at my college is so insanely cheesy and stupid it's ridiculous.
+Delaney Pollard They show safety videos in science class?
+Delaney Pollard They show safety videos in science class?
I remember watching this a few years back and now as a chemistry major I still go back to this video every now and then to tell people about the broken pipette/rod type of injury. Thank you so much for making this. :)
Don't know if anyone is reading this, but here's another tip- never dilute concentrated aqueous acid by simply adding water to it! Instead, add water to your beaker (or whatever type of equipment you're using) first and THEN pipette the acid into it. Otherwise, the first few droplets of water might react and heat up very quickly and end up splashing and causing burns. Be safe and stay curious!
8:09 THE CHEMISTS' WATER BUCKET CHALLENGE
YES!
We watched this in Science Lab, and I shouted, "OMG HANK GREEN!" and no one knew what I was talking about!
I had to restrain myself from doing that lol.
I was like, "you guys, I unironically watch this channel". My science class finds me weird now.
My fondest memory in chem lab was getting concentrated hydrochloric acid on my shoe and it burning a hole into it in 3 minutes. Luckily my teacher used it as an example and gave me the money to buy a new pair :P
One hell of a teacher XD
Rob Gilmore ...I got concentrated HNO3 on my clothes and it turned orange
Rob Gilmore are you sure that it was conc. HCl? I happen to pour concentrated HCl on my clothes (and skin) every so often, since we do a lot of analysis and titrations in our chem lab, and it just behaves like water. It evaporates after a while. Maybe it was sulphuric acid.
i love your potter puppet pals t-shirt
Eyyy Pikapetey what up?!
Same what a coincidence, I was reading a Harry Potter book
So I was sitting in my (usually) boring lab safety class and the teacher says that she is going to show a video with a weird man explaining lab safety... my toughts: 'Ughhh here we go'. Then I see the beginning of the video. Wait? wait? wait! That's Hank Green!! :D. That made my day.
We actually watched your video during chem lab here at Chattanooga State! Finally a replacement for 1980s lab safety VHS tapes!
This has changed the way I pour EVERYTHING. Thank you!
innocent_fugitive break that surface tension!
This is the best lab safety video ever. Also, adorably nerdy.
My had a lab accident in regards to disposing what I think was Benzilic acid, or some other fatty acid. The instructions for the lab were poorly worded so we prematurely percieved that we needed a new acid to work with. However, (and you can tell we were geinuses when you see the next part of my story and know that the experiment was specifically concerning boiling point elevation and freezing point depressions with solutions), we disposed of it improperly in the sink and Benzilic acid has a melting point above 100 degrees Celsius and we, not remembering this kind of important aspect of the acid, poured it into the sink and turned on the water. *Ckhshhhhhhhhhhk* was the sound of the acid immediately solidifying on the entire bottom part of the sink, and *slap* was the sound of our hands into our own faces at the realization of what we had just done and the realization of how annoying it was going to be to clean up. It made for a very funny story to tell as y'all can see.
lol I dropped a test tube filled with hcl on the teachers desk while showing her and she got rlly mad lol
the entire time
in chemistry this year
i always wondered
what does the emergency wash look like when it is turned on
thank you hank
I got sent to this video from a safety training module for an actual job in a lab. Congrats, this video has made it!
I got worried for a second when it said it was a "humorous video" but this was the best possible outcome
I watched this video for the first time like 2 years ago and I still get hanks voice in my head telling me to "commit" when pouring anything and a lot of other things in life that follow the same principle. Very valuable advice both for chemistry and life!
The only lab injury I've ever had was from sheer stupidity. It was in undergrad gen chem. My lab period was ending and I was in a hurry to dry my glassware. To get one of the test tubes totally dry, I used a rolled up paper towel and shoved it in with a glass stirring rod... Yeah, there was a fair bit of bleeding. The most memorable part is that once I ran to the infirmary, the nurses ended up pouring liquid Tylenol all over my hand! On the plus side, she looked at the wound under magnification and apparently, there were no glass shards in there. Good times...
what-how-oUCH.
DESTROY THAT SURFACE TENSION ! Lol
Like...smash?
Oh my God I watched this in chem today and it made me so happy to see Hank when she turned the video on.
I was also taught to always pour acid into the other liquid you're adding it to. If it splashes, it just displaces the less harmful material.
This is a good recess from all the entropy and enthalpy i've watched from previous episodes hahahaha
Hank, I think you are the best teacher I have ever had the pleasure of learning from. Thank you so very much for all these videos! You and your brother are fantastic!
Don't forget bow ties in place of neck ties. That's no a lab safety tip; bow ties are just cool.
+Andrew MacKinnon what type of high class chemistry do you do?
Bill Nye is that you
Maybe it is a safety tip. I mean, long neck ties are more likely to catch fire and drip into flasks because they're longer, kind of like long hair safety.
And as the good Doctor said. "Bow ties are cool."
@@DKing-qr1gl you don't wear bow ties to your school?
Class people :)
Be classy :)
I've rubbed sulphuric acid on my face before because i did not realise it was on my gloves. Kids, DON'T EVER TOUCH YOUR FACE IN THE LAB
CazyWazyWooWoo what .... what happened
Here in India most of the Higher Secondary students use just a labcoat for safety(which by the way many forget to bring for practical class). Noxious gases? Well, we breath and cough. Interesting to see the entire class(including the teacher)coughing. Still all this makes the lab life memorable-burns, heating the test tube as if cooking food, fumes, broken apparatus and on goes the list
true!! even when our teachers want us to smell something they just stick it in our face
We just watched this in our Organic Chemistry Lab. I was expecting the weird old one then Hank came on and I had one of those excited nerd moments. So guess what crash course, you've attracted the attention of a SUNY school!
Hank forgot to mention that you should keep the door locked. In that way, you buy yourself a few extra minutes to flush the evidence when the cops break the door down.
I've always wondered what eyewash station and shower looked like in action. Thanks Hank for showing us!
I'm doing chemistry and biology as two of my A-levels in September & I'm going to watch all these crash course science videos to get me ready for them! Thanks! :)
Seriously my fav episode love the commitment Hank!
It's worth mentioning that MSDS sheets are in the process of being replaced with globally standardized SDS sheets.
Yeah, it wouldn't hurt to update this video with a quick mention of the new Globally Harmonized System of Classification and Labelling of Chemicals (www.osha.gov/dsg/hazcom/ghs.html). Maybe it could be spliced in between a scene cut?
Mark Jochum I think they could just add in an annotation for it as well. Depending on how much detail they would like to put in of course.
THAT TSHIRT OMG POTTER PALS
"Dilution is the solution to pollution!" - 😂❤
That was awesome! I am so glad you have no limits and how you want to keep me safe in the lab.... Thank you. You are an awesome teacher!!! I really didn't like chemistry before this but you made it kind of simple to understand (lol)...
Thank you for posting this vlog1! I loved it!
I had a bunsen burner tube come off the burner and the tip of it ignite in the fume hood. All I said to the professor was "Emergency, gas off." and he simply turned the gas off with no hesitation. If I met anyone who I was in that lab with, they would probably remember me just for that event and how large and hot the flames were inside that fume hood.
When I was in my Junior year of high school I was a lab assistant for the Chemistry teacher and another student and I were assigned to go around each week to all the science rooms and test the eyewashes and showers. Best Job Ever. XD
Hank, you smiled so much in this episode. You clearly enjoy yourself. Wonderful to watch.
FANTASTIC EPISODE!! entertaining and informative
At my old uni, those emergency showers were often located in hallways, near bookcases and other places you wouldn't normally want water, so it was pretty obvious they were for emergency use only. Also in most labs (I wasn't in the chemistry departments much) eye wash was with a specially shaped glass in the first aid kit, not that smart fountain you showed.
"Dilution is the solution to pollution." XD This is why I love you Hank, please make more episodes in the lab!
Thank you for the summary of the points at the end of each presentation. It helps me know which parts I was not paying attention to.
Your videos are great additions to my teaching and are fantastic visual reinforcements in my classroom. Keep up the good work!
This showed up today in my intro to engineering tech class
I'd like to take a moment to appreciate the fact that he is wearing a potter puppet pals shirt.
Noticed that while watching this at school.
You might be a nerd fighter!
I scrolled down the comments to find someone who mention about the shirt, and i found you!!!!
HUFFLEPUFF
Awesome job explaining lab rules and guidelines. Very helpful in preventing accidents. Thanks for sharing!
Thank you! This semester I will be showing this instead of the very old yet still true but very boring video that has been shown for years! I love your channel and will promote to all my chem classes from now on.
8:10 the first Ice Bucket Challenge
Naw fam that was the titanic
true dat
We once did an reaction where it said to add a thermometer and keep the temperature at around 100°C and my teacher said, cooking water is always at 100°C so we do not need a thermometer. What he didn´t know at this time is that the reaction results in enthalpy so you actually had to cool it down to 100°C...
Thanks for another awesome video hank, I wish I could've watched this video sooner! It wouldve been big help in the APT science olympics
thank you for having a solution to pouring solutions. I'm really short and trying to pour something into a burrette while making it rain on my station was pretty embarrassing and i couldn't do much about it but now one shall commit thank you sir.
5:30
My college doesn't have those.
We have to use our mouths
And yes.
I did accidentally get something in there.
wut was is
I wanna try the shower too but not coz of an emergency. Just for fun 😂!
Thank you for this video. I have a lab safety quiz in my Chemistry class tomorrow and I didnt know if I'd be able to remember all the info. This video broke things down for me and made it simple. Im much more confident now that I understand the rules.
thank you Hank Greene! this is by far the most entertaining lab safety video evar! i am totally sharing this with my department! :3
The Emergency Shower Challenge - It should be a thing.
Hi
I'M SORRY BUT I LOVE YOUR POTTER PUPPET PALS SHIRT!!!!!
That's all I could focus on the whole time
You're not the only one. That is the first thing I noticed too!!!
thank you Hank the ending was great
I was a safety officer a long time ago and would demonstrate the eyewash/shower sometimes. The water initially was warm and it gave me an excuse hide in the office for a few hours while I dried off. The teacher I had for basic and advanced chemistry was very keen on lab safety. He became a teacher after a lab accident where he worked left him slightly handicapped. Great video!
I have actually stuck a glass rod through my hand, but not how Hank described it. I was 14 and my science teacher was talking about how the kind of glass it's made of can't hurt you. So, determined to prove him wrong, I took a glass stirring rod, broke it and then forced it through my hand. I didn't expect that it would actually go through because the edge did feel blunt, but it sure as heck did go through like a hot knife through butter. I told my teacher and all he did was tell me to go to the bathroom to clean it up. So I trailed blood to the bathroom and wrapped it in toilet paper for the rest of the day.
😱😱😱 WHAT KIND OF A TEACHER IS THAT!
You know you can sue him, right? And the school...
I wish I could for your own benefit if nothing else, but I did indeed track an impressively crimson chain of blood drops to the science-wing bathroom. Mind you this was nearly 20 years ago, so many subsequence stirring rods have been manufactured thus far.
+Nothing\ well i think we all have our own little stories. I once jammed, and I kid you not, a needle into my palm. The needle, thankfully only contained some deionised water but imagine if it contained, say hydrochloric acid...
John Yyc I've actually stuck a long thin needle through my palm. Also gave myself the biggest bruises ever setting up IVs with absolutely no knowledge of how to do them.
u are very brave
"Assume every liquid except water is flammable."
How unscientific! My labmates and I test to see whether any liquid is flammable! if it is, get a whole beaker of it and set it on fire... for science.
This is a great video. I love your entire series and used your videos when I was studying to add additional content areas to my certification. I would like to recommend (more like beg) that you make a few of your videos more basic for middle school classrooms.
Great video guys, I would love to see more!
Watched it today in Biology. Fan girled
So did I!!
His T-shirt says, 'Alas, a Cornucopia of Love.'
Let's not forget that it has the potter puppet pals on it!
I'm glad we had this talk.
My favourite CCC episode so far!
yes! I can't wait to take my pants off in lab!
if you spill on lap, that means the boxers must come off >:(
One time my chemistry teacher cleaned up some hydrochloric acid (just a few drops that landed on the counter) with a paper towel and threw it in the garbage bin. Then he found some dripped sodium hydroxide on the surface and cleaned it up with another paper towel and threw it in the same bin. Acid + Base = explosion, flames, and smoke alarm. So remember kids, always know what you throw away in your trash bin XP
I enjoyed this episode. keep em' coming.
Thank you so much for this episode. It is a great resource to be used in the classroom.
NO WONDER HE LOOKS SO FAMILIAR, HE'S JOHN GREENS BRO WHOA
issy s NOOOOOOOOOOOO!!!!!
wait, you seriously didn't see hank in biographies of john green?
Not very relevant note on the hair rule: it was Christmas mass in church and I don't know if everyone does this Christmas Eve but we light candles at a point during the mass. Everyone has their own little stick of a candle that they hold and pray for both baby Jesus and in hopes that the wax doesn't drop onto their fingers. Anyway, my aunt's hair once caught on fire in the middle of everyone being quiet and solemn and praying so yeah. Not relevant but I thought I'd share.
Mary Kate Picketts My paranoia is now made valid
MK a
That was awesome! Lab episodes are fun.
I honestly never knew what the fume good was for or how to work it. You're awesome Hank!
One I feel should be mentioned, never wear contact lenses in the lab, some organic solvent can cause them to literally fuse to your eyeball!
The lab I'm an intern at has an emergency shower... I've always wanted to know what it looked like when showering xD
Loved this video. I show this to my 10th grade chemistry class and then I had them do a class project of teaching the class about lab safety. Give it s try and see how you like it.
so informative! Really great and insightful video- a must for any science classroom and lab training session
my teacher required us to watch this before our lab
"Pulminary Edema...Death..."
Lol
Stumbled on this when looking up something else. This is awesome!
Love your Videos, I learn so much more than i did in simple chemistry class!
HOLY MONKEY BE CAREFUL!!!!!! XD
billy was a chemists son but now he is no more what he thought was h2o was h2so4 hey
Loved this video, thanks Hank!
This was a good episode, it's applicable to any lab you work in. I'm not studying chemestry but I have found this series interesting - this episode I found useful.
Hey Crash Course people, can you please update this video? There are some issues with it! (disclaimer: I teach college level organic lab, hello my students who I told to watch this video!) (1) Hank doesn't wear goggles and he keeps touching his glasses with his GLOVED hands...a no-no in lab! Take your gloves off to scratch your nose or adjust your glasses! (2) Lab Safety is going away from the hazard diamond to GHS pictograms, hazard classes and categories so this should be updated. (3) DILUTION IS NOT THE SOLUTION the EPA will fine you a bazillion dollars. In research labs it is against the law to dispose of anything with a pH > or = 12.5 or < or = 2 in any other way than as hazardous waste.
Well he did say it's for some chemicals like common acids. Most common acids in labs are diluted by default. He did say others should be properly disposed of.
my teacher really trynna have me watch a 10 minute video on LAB SAFETY. lol she wild
bruh same😂
I really hope you're joking. Even if you're in an intro level course, a small amount of precaution could save you a lot of pain. I had chemical burns from a slight bit of carelessness just opening a container in intro chem, (NaOH into my face) and I've known people with far worse from lab accidents, including permanent scarring. (One guy still has glass shards stuck in his torso) Taking a little time to get used to the lab isn't much of an effort.
Besides, this video is a lot shorter and more entertaining than most safety training is.
Oh no it was a joke lol! I'm sorry about the careless people. I think it's great that lab safety is enforced so much in schools!
Glad you're joking. Ten minutes learning safety practices could save you a lifetime of blindness or other injury.
or even save you from the rest of your life being pain which is a few hours because you did a dumb thing that killed you.
Thank You for this Video.....Everyone preparing for any schooling should see this video! Especially in the Sciences area!...WOOT !
Great video! If all safety lectures were this entertaining, I would feel better in my science courses!
My Bio teacher accidently dumped a strong acid on her pants on college... it didn't end well.
6:20-6:22. See which finger hank is pointing
This helped me with my work at school and i am so happy !
I enjoyed hearing the stifled laugh of Michael (I think) in the background at 2:03 after Hank uses the Eye Wash Station...