Redox Reactions
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- Опубликовано: 9 сен 2013
- 031 - Redox Reactions
In this video Paul Andersen explains how redox reactions are driven by the movement of electrons from the substance that is oxidized to the substance that is reduced. Oxidation is the loss of electrons and reduction is the gaining of electrons. Since electrons are not normally displayed in a chemical equation oxidation numbers are important in determining what atom is oxidize and what atom is reduced. Redox reactions are important in energy production and can also be used in basic titrations.
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Are youtube teachers really better or is it something about the setting of being alone in front of your computer watching the video and having access to a pause button? Whatever it is it's a real thing. I could earn a better education from youtube for free than paying for one at my university. To bad a shiny RUclips diploma won't get me a job that puts food on the table. Thank you for your help!
We are totally buying diplomas at Universities, the real learning is always on us...
Mainly because our instructors don't teach...
This is sadly true, I was literally just talking about how horrible my instructor is, I learn way more from RUclips.
It should be a crime specifically when it comes to IT learning, The classroom lags WAY behind. I was taking a web development course, this is in a college BTW and the most that was taught was how to use the tag in HTML and they called it programming lol.
Its the use of animations and writing things out directly in front of you. Also, being able to pause really helps. I do find youtube videos are better because they are pre-planned on a specific topic a teacher often has to teach many things throughout the day and will forget to say certain things that could be very crucial for someone to learn. A simple "i did this because of this" can be the difference between "ohhhhh i get it now" and "i lost you half way and didnt understand the rest".
You are the single reason I passed bio and are now the single reason I am passing chem. Bless you sir.
I swear to god you're the best teacher i've ever had in years i don't know how to thank you. I feel like writing a comment isn't enough i want to thank you so freaking much. you are the best and I wish you all the best and that you live a life full of laughter and happiness.
remember.
Oxidation numbers:
Mn=0
Pb=+2
(NO3)2=-1
----->
Mn=+2
(NO3)2=-1
Pb=0
Manganese is being oxidized
Lead is being reduced
The reaction is a Single Replacement
Half Reactions:
Mn ---> Mn(NO3)2+2e-
Pb(NO3)2+2e- ---> Pb
Can you explain how you got (NO3)=-1?
Because Nitrates charge is -1? I may have done it wrong though. Ill check later and reply back.
No wait you did it right, I just forgot that the oxidation rule for ions is that it is always its regular charge
Sorry can you explain how you got (NO3)2=-1 and Pb =+2 please
Chloe Sargent NO3, nitrate has a negative charge (-1). According to the rule, the oxidation number= the charge. Therefore, NO3= -I
Because we've got 2 nitrates (NO3)2, 2*-1=-2, so Pb has to have the oxidation number +II (+2) :)
Thank you for helping me understand so many things that I never fully understood before, both in chemistry and in medicine. I always recommend my classmates to watch your videos .
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It never fails, I can spend hours trying to understand something in my textbook, but your videos are always far more helpful! I cannot thank you enough for helping me make A's in college this semester. You're basically teaching me chemistry AND A&P rather than my instructors. THANK YOU!!
remember.
SO HELPFUL!!! I have my AP chem test tomorrow, and your videos have been so helpful all year! YOU ROCK!!!
Consistently delivering excellent tutorials.
Great job and thank you!!!
Absolute life saver, all questions answered. Thank you so much
Thanks for the video, I find them a great way to review before the AP chemistry test! My teacher taught us a way to remember oxidation and reduction in terms of anode and cathode, "a" in oxidation for anode and the "c" in reduction for cathode.
No problem :) and as I continued watching his videos he taught the other way to remember "An Ox and a Red Cat", so either way works to remember.
So far, you are the best chemistry teacher I found on RUclips, you are better that my university teacher, thank you!
I was stressing out so much because I simply could not understand Redox reactions from reading my textbook. But you sir, have made me understand this in just over 11 minutes. Thank you! :D
Bozeman I'll love you to do more videos about chemistry 🙏🏻 Your way of explaining and teaching makes everything easier to understand damnn
I love you, Man. you really clarified everything for me.
The way you explain it makes it so comprehensible and has helped me a lot, thank you so much for doing all this videos!!! Greetings from Mexico!!!
thanks for doing this man, i love science and your videos help me a lot with my AP chem quizzes. keep doing what you're doing!
6:58
Mg+2HCl----> MgCl2 +2H2
this equation is not balanced, the coefficient next to the hydrogen should be removed
Mg+2HCl----> MgCl2 +H2
I noticed that too!
confused me
yup, I noticed that too haha
yup thanks!
This video should really have shown how to find the redox reaction for that Mn + Pb example
thanks!! very helpful, ive started a biomedical science degree and i have no chemistry at all before I started it!! this has helped me A LOT xx
You're a lifesaver Paul, god bless
You👏🏼taught👏🏼me👏🏼when👏🏼my👏🏼teacher👏🏼didn’t
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Oh man, Thank you! This has come at the right time! Your videos are great!
Your videos are so awesome!!! Thank you so much for taking the time and effort to explain concepts clearly and thoroughly. You are the reason I am passing (and understanding) chemistry. Thank you so much!!!!!!!!
Thank you soooo much for making your videos, without them, I'd be one lost chemistry student. You are awesome! :D
First actual helpful video I've found! Thx a lot for making this!
You are an excellent teacher. Thank you.
Thanks Paul!
I learned a lot here that my teacher didn't know how to teach!
I love you so much. I feel like a genius now!
awesome vids! everyone loves khan academy, but i have to say a lot of your vids are more clearly and quickly explained than khans. sometimes he takes too long to explain simple concepts, but the pace you go through is perfect!
I wish I saw this video before handing in my report.
Thank you for making this kind of helpful videos ;).
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This was very helpful. Thanks!
Thanks a lot bozeman science, yet again you have made a lot more intelligent in just 10 minutes of your video. I would just like to point out to everyone that the chemical reaction equation between magnesium and hydrochloric acid is not balanced
My exam is tomorrow! I love you Mr Anderson!
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Thanks mate! Helped so much
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Such a helpful video to refer to 🙏
Thank you for this video regarding redox reactions
Massive help ..! I'm so confident that I'm going to crack my exam.. :) Thank you so much
soooooooooooooooooooooooooooooooooooooo helpful!!!:) thanx. You explain a lot of biology and chemistry better than my teachers. Keep posting I am so greatful. I totally understand particularly the oxidation numbers
thank you. it helps. I didn't understand my instructor when she explained in the class. but you made it so easy.
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Great instruction, two thumbs up
you are awesome! please keep making these videos, it helps so much even when I think something is impossible once you show me how to do it becomes the easiest simplest of things. by the way I always wanted to make videos like that but I just haven't mastered chemistry quite yet. thanks again. you are awesome.
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Thank you to that person who translated to Thai! So helpful !
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I'm not sure if anyone caught this yet, but the oxidation of magnesium with HCl to afford magnesium chloride and hydrogen is improperly balanced. There should not be a coefficient in front of gaseous hydrogen on the product side.
I noticed that too.
AM I CORRECT?????????
Mn + Pb(NO3)2 ----------> Mn(NO3)2 + Pb
Mn=0
Pb=+18
N=-3 since they have 2 N it's = -6
O=-2 since they have 6 O it's = -12
------------->
Mn=+18 (Mn have increased in its oxidisation state from 0 to +18 so it is considered as oxidisation)
N=-3
O=-2
Pb=0 (Pb have decreased in its oxidation state from +18 to 0 so it is considered as reduction)
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We know that the polyatomic ion NO3 has a charge of -1, and since there are two of it per side:
Mn + Pb(NO3)2 --> Mn(NO3)2 +Pb has oxidation numbers:
0 +2 -2 +2 -2 0
Mn is reduced 2 e-
Pb is oxidized 2 e-
@K3707H other way around for the reduced and oxidized and remember OILRIG
Pb(NO3)2(aq) + 2e- --> Pb(s) REDUCTION
Mn(s) --> Mn(NO3)2(aq) + 2e- OXIDATION
Anyone agree?
Thank you again for all your help!
Thanks for your excellent and professional work of teaching Chemistry via Skye. I have two remarks in this lesson is that you forgot to emphasise that the half reactions of redox involved equilibrium. You wrote the half equations of redox as if they were one-way reactions. Rather then reversible. This simple mistake can make the whole topic much more difficult to understand than is necessary.
The second remark that at 8.03min the chemical equation is not balanced. Please take intention to that
All the best for you
Dr Youssef El Aziz
@7:00- the equation is not balanced. Should be H2 instead of 2H2 on the right side.
Hello Sir, I have a question...
Why the conductivity of group 1 elements from Li to Na increases but from Na to from Fr there is a decresing order??
You are so fucking cool Mr. Bozeman. I wonder where you went to school. I wanna be like you when I grow up.
For those who don’t know
Sin
Opposite
Hypotenuse
Cosine
Adjacent
Hypotenuse
Tangent
Opposite
Adjacent
6:18 why does S have a charge of +6?? How r we suppose to know when the ion have a charge of 2-??? What is happening omg help...
thanks to you I entered university and I hope that with your help I can get out of it
Best explanation great
How does the sulfur in sulphate have a +6 charge? Please could you explain.
Hey Mr Andersen, Right at the start of the vid, you say we are "transferring high energy electrons to more low energy electrons".. Can you clarify in what way/mechanism they change energy state please.. for example, by moving between electron shells, or maybe to a different Heat of Enthalpy/Formation or one of those things? Thanks, you're a lifesaver!!
At 8:43, you make the equation "2HCL(aq) + 2e- -> 2H2(g)" and I understand that the chlorine goes with the magnesium to form a MgCl, but where do you get the 2 extra hydrogenatoms? And because there are now 4 H atoms, doesn't that mean that the total charge had to be -4?
Thank you!
At 1:00 , you have the Gaining and Losing pointed at the Oxidation numbers on the reduction side and the oxidation side respectively,
that might be confusing since oxidation is an increase of oxidation number,
while reduction is a decrease of oxidation number..
PEACE BRUDDA SAVED MY LIFE OUR TEACHERS EXPLAINING IS VERY CONFUSING
So true Mahmoud!! LOL We have the same teacher !!
When adding the half reactions together, if the H+ and water aren't the same do you subract the greater by the lower?
It would help if you would discuss how electrons can be transferred from one element to another when the bonds on both sides of the equation are covalent (shared electrons).
Great instruction. If you have been watching crash course you will notice that this is much more helpful. Sorry Hank!
Hank can't be beat for giving really quick overviews - but his is not intended as an indepth study. Mr. Anderson is wonderful for the more indepth look... but if I need just a fast reminder of an entire concept, I turn to Hank.
i lovee you!... helped me alot
Thanks this was very helpful. One question though. Can you explain why we seem to just be making up the oxidation numbers for some of the elements. I learned that the oxidation number for sulfur is -2, but your showing it as +4 in the SO3 problem.
Also please give the final answer for the practice problem. I think I have it right, but I'd like to be sure. Thanks.
thank you so much you saved my life lol
That's a good one.
Nitpicky note (not that it really matters), but before you introduced rule #3 Oxygen is -2 (peroxs. -1) etc..., while it was faded out, it read "Oxygen is +2..." rather than -2.
Mn + Pb(NO3)2 → Mn(NO3)2 + Pb
Oxidation Numbers 0 +2 (-1)2 +2 (-1)2 0
Mn: oxidation number increased from 0 to 2 (it became more positive), which means that it lost two electrons. Loosing electrons means oxidation. Therefore, Mn is oxidized.
Pb: oxidation number reduced from 2 to 0 (it became more negative), which means it gained two electrons. Gaining electrons means reduction. Therefore, Pb is reduced.
Half reactions are as follows:
Oxidation reaction: Mn → Mn(NO3)2 + 2e-
Reduction reaction: Pb(NO3)2 + 2e- → Pb
Thank you thank you thank you!!!
sir i have a question , Why does the [Redox Reaction] Mg + 2HCl → MgCl2 + 2H2 , the hydrogen product isnt balance with the reactant , i thing it should be Mg + 2HCl → MgCl2 + H2
Good spot, I think you are right.
all of your videos were great, but unfortunatly I didnt understand this one yet
BRILLIANT
For those confused with Pb(NO3)2.It is suppose to pre known knowledge that NO3 = -1 because HNO3 exists. H=+1 so NO3 = -1. So NO3x2 = -1x2 = -2, so Pb must be +2 for the neutral molecule to equal 0.
it is helpful video thanks to you
but is it ok if the Cl has -1 charge and Cl2 has the same charge -1 like your example in 7:21
What were the half reactions for the practice problem? I'm stuck :/
Because K^+ in the example is ion (ion - charged) therefore its oxidation state is +1
If the given example is a free element, K (without the indicated charge), the oxidation number will be zero
hope that helps! :))
Electrons are negatively charged, (each -1). Gaining electrons results in a reduction of the charge meaning it is more negative or reduced, (though there must be a deeper explanation than this).
It might be helpful when understanding that something is oxidised when it loses electrons in a reaction. An oxidising agent attracts electrons strongly. so when something is oxidised the electrons are lost (attracted) to the oxidising agent.