CHEMISTRY COMMUNITY

Kathrin Magdalani 3J

A photon checks into a hotel and is asked if he needs any help with his luggage. He says, "No, I'm traveling light."

Kathrin Magdalani 3J

https://sciencenotes.org/wp-content/upl ... icexam.png
https://img.buzzfeed.com/buzzfeed-stati ... 5555-1.jpg

Kathrin Magdalani 3J

If anyone in section 3J got #1 and/or #7 right on the quiz and would be willing to explain I would really appreciate it. I would write out the questions but there are a lot of subheadings that make it kind of hard. :/ Thanks in advance!

Kathrin Magdalani 3J

When work is done on the system, it's positive. When work is done by the system, it's negative.

Kathrin Magdalani 3J

#8 on Quiz 1 Preparation says, "For reaction: 2C+2H2=C2H4, DeltaH= +52.3 kJ/mol and DeltaS= -53.07 J/K*mol at 298 K. At what temperature will this reaction be spontaneous?" Initially, I thought the formula needed to solve for the temperature was DeltaG= DeltaH - T*DeltaS but then I saw th...

Kathrin Magdalani 3J

it's basically saying any error in W, even a relatively large one, wouldn't cause a large error in S
so no, a small error in W wouldn't cause a large error in S

Kathrin Magdalani 3J

Exothermic reactions?
I studied them before they were cool.

Kathrin Magdalani 3J

The email from last quarter says 4006 Young Hall :)

Kathrin Magdalani 3J

The products of a combustion reaction are always carbon dioxide and water.

Kathrin Magdalani 3J

Yes, I believe so.

Kathrin Magdalani 3J

Heat (Q) is energy. It is the total amount of energy (both kinetic and potential) possessed by the molecules in a piece of matter. Heat is measured in Joules. Temperature (T) is not energy. It relates to the average (kinetic) energy of microscopic motions of a single particle in the system per degre...

Kathrin Magdalani 3J

All you have to do it click your current username at the top right then click user control panel. Once you do that just change your username and put in your current password and you're all set!

Kathrin Magdalani 3J

A photon checks into a hotel and is asked if he needs any help with his luggage. He says, "No, I'm traveling light."

Kathrin Magdalani 3J

Bonds that are partially ionic are polar. Nonpolar bonds have an equal sharing of electrons.

Kathrin Magdalani 3J

Because their concentrations pretty much stay constant.

Kathrin Magdalani 3J

Yes. A lewis acid is an electron acceptor and a lewis base is an electron donor.

Kathrin Magdalani 3J

https://www.boundless.com/chemistry/tex ... 354-10522/

It helps to see it all in one chart. :)

Kathrin Magdalani 3J

I asked the guy sitting next to me if he had any Sodium Hypobromite…
He said NaBrO

Kathrin Magdalani 3J

A formal charge of zero means the atom has the best balance of bonds to lone pairs according to its valence (meaning it's stable).

Kathrin Magdalani 3J

"some of the third-period elements (Si, P, S, and Cl) have been observed to bond to more than four other atoms, and thus need to involve more than the four pairs of electrons available in an s2p6 octet. This is possible because for n=3, the d sublevel exists, and it has five d orbitals." S...

Kathrin Magdalani 3J

Q: What do you do with a dead chemist?
A: Barium

Kathrin Magdalani 3J

They are converting to Joules.
1 eV = 1.602177x10-19 Joule

CHEMISTRY COMMUNITY

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Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Quiz 1 #1 and #7

Re: Work [ENDORSED]

Re: Quiz 1 Preparation Answers

Re: Conceptualizing the Boltzmann Equation

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Re: Finals from 14A

Re: HW Problem 8.93

Re: Bond Enthalpy [ENDORSED]

Re: Heat and Temperature

Re: How to change our username

Re: Post All Chemistry Jokes Here

Re: Polar/nonpolar [ENDORSED]

Re: K value

Re: Fall 2014 Midterm Question 2B

chart of shapes

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Re: Formal Charge of 0 [ENDORSED]

Re: The Octet Rule (and exceptions)

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Re: calculating wavelength [ENDORSED]