CHEMISTRY COMMUNITY

Paul Adkisson 1D

A "ring flip" is simply a transitional process that occurs for cyclohexanes when the end that is pointed down rotates and becomes the end that is pointed up, causing the other side to rotate and point down. This is usually caused by some sort of molecular collision. To draw it, one would j...

Paul Adkisson 1D

Wait, How would that work? The reduction reaction isn't balanced (Fe on products but not in reactants). I also had trouble determining n for this question.

Paul Adkisson 1D

Dear Dr. Lavelle, You are truly an inspirational man and a wonderful professor. You provide so many resources to all your students so that everyone can succeed in this class, and I have found them incredibly helpful. Whenever you are lecturing you always look so excited to be explaining chemistry, a...

Paul Adkisson 1D

The orientation of substituents does not matter for most molecules because the bonds can rotate, so any number of different orientations can be correct as long as they yield the same name. The only significant exception is in the case of geometric isomers. When choosing orientations around a double ...

Paul Adkisson 1D

I was somewhat confused on the sign of k. Since the General Rate equation for RXN aA --> bB is Rate = -1/a d[A]/dt = 1/b d[B]/dt, and we know d[A]/dt = k[A]^(molecularity) would the sign of k change whether we are considering the product or reactant? Or is it always positive? Is there something I'm ...

Paul Adkisson 1D

The cell potential is always positive when making a battery or an electrical system that can do work. However, in some reactions, electrical work is required to drive the reaction. In these cases, Eo is negative. In this question, we are using E(cell) to determine the equilibrium constant for a reac...

Paul Adkisson 1D

Hello, I believe there may be an error in the corrections of the solution manual errors. In 14.35b) the corrected version states,

At 25 ℃, lnK = (1)(+0.12 V) ÷ 0.02569 V = +4.6
∴ K = 1 x 10^3

However it is quite clear to see that e^(4.6) = 99.5 ≈ 10^2 ≠ 10^3

Paul Adkisson 1D

when ∆H is listed next to a balanced reaction, is it referring the enthalpy corresponding to the stoichiometric coefficients, or is it referring to the reaction enthalpy of 1 mol of product?

Paul Adkisson 1D

Quiz 1 Preparation, pg 113

Paul Adkisson 1D

Did anyone else notice that the initial conditions to Problem #3 are not consistent with PV = nRT?
(3atm)(6L) ≠ (2mol)(0.0826L-atm/mol-K)(300K)
18L-atm ≠ 49.56L-atm

Paul Adkisson 1D

Could anyone explain this problem? The Solution manual states that COF2 has greater residual entropy than BF3 because the Fluorine atoms could occupy the same location as the oxygen atom. What does that even mean? I thought that since COF2 is polar it would be more likely to line up in a particular ...

Paul Adkisson 1D

It doesn't really depend on temperature. If pressure is constant, we use w = -P∆V. Alternatively when pressure is changing, we use -nRT * ln(V2/V1)

Paul Adkisson 1D

What exactly is enthalpy? I understand that when pressure is constant and all work is expansion work that enthalpy = heat, but what is enthalpy defined as when pressure is not constant? Furthermore, I know that heat is measured in Joules so it must be some form of energy, but what differentiates it ...

Paul Adkisson 1D

Also, it is certainly worth noting that 2.93 is one of the Solution Manual Errors, listed on Lavelle's website. The correct answer, contrary to the solution manual, is that Na > Cl, but Na+ < Cl-

Paul Adkisson 1D

Hey, so I know that the textbook mentions certain trends: For oxoacids, increasing the number of Oxygen atoms increases the relative strength of the acid. Also, for 2 oxoacids of different central atoms with the same number of Oxygen atoms, the central atom with the greater electronegativity is stro...

Paul Adkisson 1D

Right so, since Oxygen is the more electronegative atom, it would make sense for Nitrogen to lose its electron. But in the solution, Oxygen loses the electron instead. (Am I missing something?)

Paul Adkisson 1D

Hey, this question asks for an MO diagram of NO+. In the answer to this question, Nitrogen's 2p orbitals have 3 electrons and Oxygen's 2p orbitals also have 3(as opposed to its normal 4) electrons. Why is the electron lost from the Oxygen (the more electronegative atom)?

Paul Adkisson 1D

Why did the chemist call her ex-boyfriend Dubnium when they broke up?
...
...
...
Because he was a real Db.

Paul Adkisson 1D

I also did not understand this question, and would love a full explanation. Why are hydrogen's 1s electrons higher in energy than Fluorine's 2p (something that isn't the case in any of the other diagrams)? Which orbitals are bonding and which are non-bonding? And how does this all match up with the ...

Paul Adkisson 1D

Hey, so just confirming something professor Lavelle mentioned today: Quiz 1 will cover material up to page 60(Wednesday) in the course reader right?

Paul Adkisson 1D

Hey I got the email, but I don't think I was added to the GroupMe

Paul Adkisson 1D

@Junghyuk_Park_3K, Yeah, sorry I missed that at first. My email is paul.wesley.adkisson@gmail.com

Paul Adkisson 1D

Hey, I'm on Dykstra 10! When do you guys think you'll meet?

CHEMISTRY COMMUNITY

Search found 23 matches

Re: Ring Flip

Re: 2013 Final #4

Re: Saying Thank You to Dr. Lavelle

Re: Substituents

Units of K

Re: 14.35

Solution Manual Corrections

How to interpret ∆H

Re: Quiz 1 Preparation Answers

Re: Quiz 1 Preparation Answers

HW 9.23

Re: temperature [ENDORSED]

Defining Enthalpy

Re: Chapter 2 HW #93

HW problem 12.35

Re: 2007 Final Question 3B

2007 Final Question 3B

Re: Post All Chemistry Jokes Here

Re: Questions 4.77

Re: Quizes

Re: Dykstra Hall Study Group (Fall 2016)

Re: Dykstra Hall Study Group (Fall 2016)

Re: Dykstra Hall Study Group (Fall 2016)