Senior Chemistry: Redox 10

[pallyjoel]

I had a question regarding cathodic protection from a chemistry Olympiad test

The Question: Which metal, when exposed to air, forms an oxide coating that protects the metal from further reaction

choices: Al, Cu,Fe, and Zn

I chose Zn because of what you said in another video about zinc coated nails but the answer key has Al as the right answer. Can you think of any particular reason

Thanks Joel

[bannanaiscool]

@pallyjoel Al is right; it's oxide protects the metal underneath. Zn just corrodes, which is why it's such a good sacrificial anode.

Chemguy

[ILoveJaceAndAlec]

Is there a place where you teach how to make redox tables?

[bannanaiscool]

@ILoveJaceAndAlec My website!

Chemguy

[tubeuser147]

How do I know what voltages, concentration of electrolyte to use for electroplating?

[bannanaiscool]

@tubeuser147 You don't. You really need to know amperage, instead. Solution concentration isn't crucial, but 1 M is probably good.

Chemguy

[manders10129]

Your videos are great !! hope an A!!! thanks very much for the explanation... from PR!!

[kikyousan]

umm where is redox 9?

[bannanaiscool]

@kikyousan You need to go to my website and check out what I've got for you!

Chemguy

[maxpeeples1]

I watched these videos on Redox, coupled with studying from the book and lecture notes.... and made a 107 on the RedOx test. Thank you :D.

[bocanutz]

U-tubes on YouTube... amazing!

[songyee92]

loads of thanks from IB student in Bangkok, Thailand!

[benjiimaster]

Chemistry is the one subject I wish I didn't choose for the IB. Oh why didn't I pick enviro and get publicly shamed?

Ah well, Chemguy, your videos are so coherent and easy to follow. I thank you for that.

[renger6002]

fellow IBer here.

electrochem test today,

I wish i had taken bio too, but instead of physics

[BuggttiVeyronW16]

great video, very good previewing so that I can be more relaxed in class.

Resolution is still a problem

[WCqq]

I THINK I'M READY FOR THE TEST ON ELECTRO CHEM TOMORROW. lolol

[a615a]

ha I'm watching this before my exam tomorrow too lol

[thabeatgoeson]

a huge thanks from australia xD!

[Zuhaib3274]

heyy thanks alot.... u videos are very helpfull...

[malubayraymond]

"cations migrate to cathode, anions to anode", thats a pretty cool jingle, ill remember that ^^

[PerfectDark5]

Your looking for the alternator, thats what supplies the power to charge the battery.

[nallbani]

i'm so set for my exam tomorrow :)

thanks chemguy

from ottawa SPCHS

[rozanneisgreat]

chemguy! you rock. thankyou so much for your videos.

[prashizzle]

lmfao- sorry i was playing around with the audio preview and wrote " fuck you" and pressed post comment lol i apologize

[Tuinslang90]

this was great!

ib chem hl exam on monday,

i feel prepared for chem for the first time ever!

xD

[IriquoisPliskinn]

I think there shud be a chemguy automotive series as well, as your clearly an expert with cars too

[Ringers19]

I very much disliked these diagrams but I understand them much better now, so thanks :)

[veebbre]

chemguy saved my life for the diploma

[bannanaiscool]

Duh...

Chemguy

[VIRGINASHA]

wats a half cell?????

[eopyu]

been watching your series for awhile. Great job~

Hope you can do more topics.

[phoenixlament88]

wow talk about dedication! your series helped out more than my univ teacher ever could.

Thanks alot for your help.

[lilspiclil]

thank you so much

[rockitman150]

So U tube is salty or porous? or gel or membrane!.

[ramizkhar]

best teacher EVER!

[tiapon]

precise and comprehensive. gr8 work. best teacher!

[benni244]

Is this the last video? It seemed to end abruptly. Regardless, Those are awesome videos and very informative as well as entertaining.

Hope to see more of them.

-B.I.

[Zooey01110]

Thank you Chem guy for saving me from a nervous breakdown due to pre-finals confusion!!. You are awesome.

[rifecu]

wow!.....Great explanation!!!

[kronfgth]

Marvellous.. U hav done a great job dude

[TenoGymnast40]

"anions travel to the, anode. Cations travel to the, cathode!" tee hee hee, i just love this. it's perfect for the project my CHEG class is doing!

[NEEDDATA]

Simple, Precise, and to the Point. Very well done. We Need more science . . . . . Thank you.

[Helpbot]

Excellent

[sliderulex]

Great Job! I am studying electrochemical cells and there is a LOT of important scientific and commercial value to this study. Scientific because understanding how electrochemical reactions occur is fundamental to understanding chemistry, and of commercial value because of the myriad uses of batteries. I find electrochemistry fascinating! Fun to study theory and fun to conduct experiments!!