CHEMISTRY COMMUNITY

Diwana Lucero 3K

Sabrina A Daug 1J wrote:good luck on your final fam, we got this

thanks

Diwana Lucero 3K

In the course reader, rapid interconversion of chair cyclohexanes are explained by showing that rotating the chair conformation about the C-C single bond gives equal energy. I think this is just used to show that chair conformations are stable. I'm not too sure about other implications of this though.

Diwana Lucero 3K

Sabrina A Daug 1J wrote:cool

yes

Diwana Lucero 3K

Sabrina A Daug 1J wrote:Haha cool, when do you want to meet?

let's meet at Saxon for the final!

Diwana Lucero 3K

Tyler Miao 1A wrote:for number 8 on Quiz 3, I'm not understanding why Br2 acts as an electrophile. Can someone explain please?

Br2 acts as an electrophile because it is the one being attacked by the ethene, which has a double bond, making it the nucleophile.

Diwana Lucero 3K

Sure, I'm in H building!

Diwana Lucero 3K

Sabrina A Daug 1J wrote:i thought i did okay but its probably a big L

Me every time I do something

Diwana Lucero 3K

Brian Huynh 3G wrote:How is question one done from quiz 2?

When you balance the reaction, you get 2 mol N2O5, so you multiply the rate of decomposition of N2O5, 2.89, by 2 to get the rate of formation of NO2. So, this would be 2(2.89)= 5.78 (mol NO2)⋅L–1⋅s–1

Diwana Lucero 3K

Sabrina A Daug 1J wrote:yall ready for this midterm on wednesday

Was not ready for that

Diwana Lucero 3K

I believe the first equation was reversed because we are asked to calculate the value of ka for HF, so then you would need an equation with HF as the reactant and H+ and F- as the products. Also, the second equation does not get oxidized because it went from F2 to F-, so it gained elections, making ...

Diwana Lucero 3K

Sabrina A Daug 1J wrote:sure thing lesgoo

Cool!

Diwana Lucero 3K

Okay, thank you guys!

Diwana Lucero 3K

Sabrina A Daug 1J wrote:yo diwana

We should study for the upcoming quiz on friday!

Diwana Lucero 3K

Sabrina A Daug 1J wrote:---

:D

Diwana Lucero 3K

Calculate the standard reaction enthalpy for the reaction: N2H4(ℓ) + H2(g) → NH3(g) Given: N2H4(ℓ) + O2(g) → N2(g) + 2H2O(g) ∆H◦ = −543 kJ · mol −1 2 H2(g) + O2(g) → 2 H2O(g) ∆H◦ = −484 kJ · mol −1 N2(g) + 3 H2(g) → 2 NH3(g) ∆H◦ = −92.2 kJ · mol −1 I worked out this problem but I got N2H4(ℓ) + H2(g)...

Diwana Lucero 3K

What I did was double the first equation ( NH3+HBr→NH4Br) and reverse it, so you get the ΔH= 2(+188.32kJ).Then I added that first equation to the reverse of the second equation (N2+ 3H2→ 2NH3 to 2NH3→ N2+3H2) which gets you ΔH=+92.22 kJ. The third equation just gets added to the first two equations ...

Diwana Lucero 3K

For this problem, you want to add the first equation to half of the second equation. But since we only want the standard enthalpy of formation of N2O5, you use the standard enthalpy of formation equation to find the value for the standard enthalpy of N2O5.

Diwana Lucero 3K

I don't know if this has been asked yet, but in question 1B of the 2014 final, we are asked to find the hybridization of the 3 non-hydrogen atoms in a derivative of didemnin-A. I can see how one of the carbons are sp2, but I have trouble understanding how one of the nitrogens has a sp3 hybridization...

Diwana Lucero 3K

Can someone explain if there's a difference between pressure and compression/expansion? One of the questions in the workbook quiz asked if expansion occurs, what will happen to the partial pressure of the product and I wasn't sure how to approach the problem.

Diwana Lucero 3K

Can someone explain how to figure out if the arrows point up or down for an electron's spin state?

Diwana Lucero 3K

I'm also having trouble with this problem and I checked the answer for this, but I don't understand where the En= -2.178 x 10^-18 J came from in the explanation?

Diwana Lucero 3K

Linsey 1E wrote:I also missed the meeting but I'd love to join - can we set up another meeting?

Hey! So, if you could add me on fb, I can add you to the group chat I made for this study group so we can discuss meetings and stuff.

Diwana Lucero 3K

isabelle ruedisueli 4e wrote:I would love to join as well!

Cool! Are you available after Friday's lecture so we can all meet up at the patio?

Diwana Lucero 3K

Stefanie Shidoosh 4E wrote:Hey!
I would also loooove to be in a study group here! Such a great idea :)

Thanks! Does meeting up at the patio after Friday's lecture sound good?

Diwana Lucero 3K

Sabrina A Daug 4C wrote:Hey I would love to participate in your study group! When would you like to schedule meetings?

Awesome! I was thinking we could all meet up at the Saxon patio after Friday's lecture so we could all discuss when everyone's available.

Diwana Lucero 3K

Hi if anyone is in Saxon and wants to make a study group for Chem 14A let me know! We can discuss problems from the textbook and go over the course readers, etc in the Saxon study rooms.

CHEMISTRY COMMUNITY

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Re: Saxon Study Group

Re: Rapid interconversion of the chair

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Quiz 1 Prep #5

Re: Chapter 8, Problem 61

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2014 Final

Difference between Pressure and compression/expansion?

Electron Spin

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Saxon Study Group