Gen Chem on balancing redox

[emminent]

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Can someone help me with balancing the equation please? I follow Romano's steps but I keep messing up when balancing electrons to the equation 🙁

 

[shyfox9p]

I actually did this problem today lol
First thing - Balance the equation
Second -Identify what is getting reduced and what is getting oxidized and separate them as two different reactions
Third - For each reaction, determine how many electrons are being added or lost
4th - The electrons gained should equal the electrons lost so you need to cross multiply (multiply the I reaction by 3 and the MnO4 reaction by 2)
5-th - Just look at what you did and you'll see that you now have 8 hydrogens!
Don't be afraid to post destroyer questions and don't give up!

 

[emminent]

So for the MnO4- and MnO2 part do I add electrons there first or just balance it with H2O first then add electrons.

As for I2 and I-, do I add electrons on the I2 side?

 

[shyfox9p]

I first balance it and then add the electrons.

For the I2, you do add it to the I2 side. Think of the electrons as products and reactants for each problem.
The one that is oxidizing will have electrons on the product. The one that is being reduced will have the electrons on the products side.

 

[gras10]

From what i understood watching chads videos, a quick shortcut is to balance all of the Oxygens on the reactants, with the water on the products (ignoring the Oxygen in MnO2). This gets you 4 H2O, which then translates into 8 Hydrogen ions.

Not sure if this is a foolproof shortcut or if it just happens to work in this case, but it was my technique for getting around the technicalities.

That being said, its a pretty advanced question and i wouldn't expect it to be on your exam (though don't take my word for it. I wouldn't want to steer you away from learning it, only to have it appear).

 

[Dental786]

From what i understood watching chads videos, a quick shortcut is to balance all of the Oxygens on the reactants, with the water on the products (ignoring the Oxygen in MnO2). This gets you 4 H2O, which then translates into 8 Hydrogen ions.

Not sure if this is a foolproof shortcut or if it just happens to work in this case, but it was my technique for getting around the technicalities.

That being said, its a pretty advanced question and i wouldn't expect it to be on your exam (though don't take my word for it. I wouldn't want to steer you away from learning it, only to have it appear).

Have you tried this with other questions similar to this one?

 

[emminent]

From what i understood watching chads videos, a quick shortcut is to balance all of the Oxygens on the reactants, with the water on the products (ignoring the Oxygen in MnO2). This gets you 4 H2O, which then translates into 8 Hydrogen ions.

Not sure if this is a foolproof shortcut or if it just happens to work in this case, but it was my technique for getting around the technicalities.

That being said, its a pretty advanced question and i wouldn't expect it to be on your exam (though don't take my word for it. I wouldn't want to steer you away from learning it, only to have it appear).

How close was chad's quizzes to the real dat?

 

[ZPederson11]

What video does Chad explain this?

 

[gras10]

What video does Chad explain this?

My subscription to his videos ran out, so I can't be positive, but I'm fairly certain it was near the end of 7.1 "oxidation states and redox reactions"

Have you tried this with other questions similar to this one?

I have not tried it with other problems. I didn't come across any others studying. Sorry :/

How close was chad's quizzes to the real dat?

They were pretty similar. Especially for Orgo. For gen chem chads had more estimating than was on the real exam. Most calculation questions just had you set up the equation. For similarity in this section, bootcamp was the best.

 

[shyfox9p]

I think these type of problems are rare because of the time it takes to them. I'd like to see if the shortcut works, but I've only seen this type of problem on destroyer

 

[emminent]

My subscription to his videos ran out, so I can't be positive, but I'm fairly certain it was near the end of 7.1 "oxidation states and redox reactions"


I have not tried it with other problems. I didn't come across any others studying. Sorry :/



They were pretty similar. Especially for Orgo. For gen chem chads had more estimating than was on the real exam. Most calculation questions just had you set up the equation. For similarity in this section, bootcamp was the best.

Thanks gras, did you have more conceptual questions than calculations (setting up equations)? Also any tips on HNMR?

 

[Dental786]

My subscription to his videos ran out, so I can't be positive, but I'm fairly certain it was near the end of 7.1 "oxidation states and redox reactions"


I have not tried it with other problems. I didn't come across any others studying. Sorry :/



They were pretty similar. Especially for Orgo. For gen chem chads had more estimating than was on the real exam. Most calculation questions just had you set up the equation. For similarity in this section, bootcamp was the best.

When you guys say conceptual questions are you referring to setting up calculations or more like concepts regarding for example, gases and etc.

 

[emminent]

conceptual as in entropy enthalpy laws etc.

 

[AlvaDentistry]

 

[gras10]

conceptual as in entropy enthalpy laws etc.

I had more conceptual. Probably 20/10 split

 

[emminent]

View attachment 183155

Thank you very much; nice penmanship lol. Tired of looking at my ugly chicken scratch 🙁

 

[biomolecmed]

So for the MnO4- and MnO2 part do I add electrons there first or just balance it with H2O first then add electrons.

As for I2 and I-, do I add electrons on the I2 side?

First balance. Add the electrons last just to balance out the charge.