Search found 22 matches

by Kathrin Magdalani 3J
Sun Mar 05, 2017 5:16 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017417

Re: Post All Chemistry Jokes Here

A photon checks into a hotel and is asked if he needs any help with his luggage. He says, "No, I'm traveling light."
by Kathrin Magdalani 3J
Mon Feb 13, 2017 9:40 pm
Forum: Student Social/Study Group
Topic: Quiz 1 #1 and #7
Replies: 1
Views: 244

Quiz 1 #1 and #7

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!
by Kathrin Magdalani 3J
Sat Feb 11, 2017 12:55 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Work [ENDORSED]
Replies: 1
Views: 262

Re: Work [ENDORSED]

When work is done on the system, it's positive. When work is done by the system, it's negative.
by Kathrin Magdalani 3J
Fri Feb 03, 2017 10:26 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 13715

Re: Quiz 1 Preparation Answers

#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...
by Kathrin Magdalani 3J
Tue Jan 31, 2017 12:53 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Conceptualizing the Boltzmann Equation
Replies: 1
Views: 269

Re: Conceptualizing the Boltzmann Equation

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
by Kathrin Magdalani 3J
Sun Jan 29, 2017 6:41 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017417

Re: Post All Chemistry Jokes Here

Exothermic reactions?
I studied them before they were cool.
by Kathrin Magdalani 3J
Thu Jan 26, 2017 10:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Finals from 14A
Replies: 1
Views: 240

Re: Finals from 14A

The email from last quarter says 4006 Young Hall :)
by Kathrin Magdalani 3J
Fri Jan 20, 2017 4:21 pm
Forum: Calculating Work of Expansion
Topic: HW Problem 8.93
Replies: 1
Views: 258

Re: HW Problem 8.93

The products of a combustion reaction are always carbon dioxide and water.
by Kathrin Magdalani 3J
Mon Jan 16, 2017 1:06 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat and Temperature
Replies: 1
Views: 236

Re: Heat and Temperature

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...
by Kathrin Magdalani 3J
Sat Jan 14, 2017 4:58 pm
Forum: Administrative Questions and Class Announcements
Topic: How to change our username
Replies: 1
Views: 238

Re: How to change our username

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!
by Kathrin Magdalani 3J
Sun Nov 20, 2016 2:42 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017417

Re: Post All Chemistry Jokes Here

A photon checks into a hotel and is asked if he needs any help with his luggage. He says, "No, I'm traveling light."
by Kathrin Magdalani 3J
Thu Nov 17, 2016 1:54 am
Forum: Hybridization
Topic: Polar/nonpolar [ENDORSED]
Replies: 14
Views: 1427

Re: Polar/nonpolar [ENDORSED]

Bonds that are partially ionic are polar. Nonpolar bonds have an equal sharing of electrons.
by Kathrin Magdalani 3J
Sat Nov 12, 2016 5:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K value
Replies: 1
Views: 252

Re: K value

Because their concentrations pretty much stay constant.
by Kathrin Magdalani 3J
Fri Nov 04, 2016 8:35 pm
Forum: Lewis Acids & Bases
Topic: Fall 2014 Midterm Question 2B
Replies: 2
Views: 352

Re: Fall 2014 Midterm Question 2B

Yes. A lewis acid is an electron acceptor and a lewis base is an electron donor.
by Kathrin Magdalani 3J
Tue Nov 01, 2016 6:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: chart of shapes
Replies: 1
Views: 264

chart of shapes

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

It helps to see it all in one chart. :)
by Kathrin Magdalani 3J
Mon Oct 31, 2016 1:15 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017417

Re: Post All Chemistry Jokes Here

I asked the guy sitting next to me if he had any Sodium Hypobromite…
He said NaBrO
by Kathrin Magdalani 3J
Thu Oct 20, 2016 8:44 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge of 0 [ENDORSED]
Replies: 3
Views: 683

Re: Formal Charge of 0 [ENDORSED]

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).
by Kathrin Magdalani 3J
Fri Oct 14, 2016 7:38 pm
Forum: Ionic & Covalent Bonds
Topic: The Octet Rule (and exceptions)
Replies: 1
Views: 306

Re: The Octet Rule (and exceptions)

"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...
by Kathrin Magdalani 3J
Sat Oct 08, 2016 9:12 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017417

Re: Post All Chemistry Jokes Here

Q: What do you do with a dead chemist?
A: Barium
by Kathrin Magdalani 3J
Fri Sep 30, 2016 5:25 pm
Forum: Properties of Light
Topic: calculating wavelength [ENDORSED]
Replies: 3
Views: 453

Re: calculating wavelength [ENDORSED]

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

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