Search found 20 matches
- Fri Mar 17, 2017 12:08 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 557971
Re: Saying Thank You to Dr. Lavelle
Dear Dr. Lavelle, I can't tell you enough how grateful I am to have have the pleasure of having you as a professor for the past two quarters. I have always struggled with chemistry but you've allowed me to grow and learn from my mistakes and you've always encouraged us to do our best. Thank you a mi...
- Fri Mar 10, 2017 2:13 pm
- Forum: *Electrophiles
- Topic: Nucleophile vs Electrophile
- Replies: 7
- Views: 2824
Re: Nucleophile vs Electrophile
I think it has to do with whether or not the molecule has electrons that are readily available. If it does, it would be considered a nucleophile
- Fri Mar 03, 2017 6:49 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3618409
Re: Post All Chemistry Jokes Here
Graduated cylinder
- Wed Feb 22, 2017 10:05 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2 Winter 2017
- Replies: 160
- Views: 24826
Re: Quiz 2 Winter 2017
I'm not sure why I keep getting this wrong but for number 6 I keep getting 1.66 for the value of k. Could somebody please help?
- Wed Feb 15, 2017 10:58 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Ideal Gas Law- delta U
- Replies: 1
- Views: 1237
Ideal Gas Law- delta U
Hi! So I realize that when V is constant, w=0 (although I'm not sure why), but why is delta U =0 when delta T is 0? Is it derived from equations or is just something we're supposed to know?
- Wed Feb 08, 2017 11:02 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3618409
- Thu Feb 02, 2017 12:11 am
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 1 Preparation Answers
- Replies: 130
- Views: 25684
Re: Quiz 1 Preparation Answers
Can someone please explain why #8 is "no temperature"? since delta G = delta H - T* delta S, and delta S is negative, the value of delta G will always be positive, no matter what value is inserted. In order for a process to be spontaneous, delta G has to be negative, and in this case, no ...
- Sun Jan 22, 2017 10:22 pm
- Forum: Phase Changes & Related Calculations
- Topic: Study Group
- Replies: 7
- Views: 1448
Re: Study Group
I'd love to jump in if I could!
- Wed Nov 23, 2016 1:34 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3618409
Re: Post All Chemistry Jokes Here
Loved this one
- Tue Nov 22, 2016 11:07 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Chapter 12 Question 19
- Replies: 1
- Views: 504
Re: Chapter 12 Question 19
In sum, you should be using a variable, and not a value. So the molarity of HCl would be (.12)*([HCl]). From here you can go about the change in pH which would be -log((0.12*HCl)/(HCl)) which gives you 0.92. So the change in pH is 0.92.
- Tue Nov 22, 2016 11:03 pm
- Forum: Student Social/Study Group
- Topic: Final Study Group
- Replies: 12
- Views: 2470
Re: Final Study Group
Count me in!
- Tue Nov 15, 2016 9:42 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs Q [ENDORSED]
- Replies: 4
- Views: 968
K vs Q [ENDORSED]
Hello! I know that Q and K are calculated the same way, but can someone explain what the difference between the two is?
- Sat Nov 12, 2016 3:40 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3618409
Re: Post All Chemistry Jokes Here
Why did Barium, Carbon, Potassium, and Sulfur get along so well?
They had each others BaCKS
They had each others BaCKS
- Fri Nov 04, 2016 9:01 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3618409
- Sun Oct 23, 2016 9:16 pm
- Forum: Lewis Structures
- Topic: Central Atom
- Replies: 5
- Views: 1225
Central Atom
How do we determine what the central atom is? I know I wrote it down somewhere but I can't seem to find it. Was it the higher electronegative atom?
- Sun Oct 23, 2016 9:10 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration for Ions
- Replies: 1
- Views: 834
Re: Electron Configuration for Ions
I believe the proper configuration would be [Ar]
- Tue Oct 11, 2016 7:40 pm
- Forum: Limiting Reactant Calculations
- Topic: __ Al(s) + __ HCl(aq) --> __ AlCl3(aq) + __H2(g)
- Replies: 3
- Views: 9778
Re: __ Al(s) + __ HCl(aq) --> __ AlCl3(aq) + __H2(g)
I did that, but i got a different answer than the one in the book. I got 4.49 but it says the answer is 9.51 and i can't figure out what I did wrong
- Wed Oct 05, 2016 11:24 pm
- Forum: Photoelectric Effect
- Topic: Work Function and Threshold Energy [ENDORSED]
- Replies: 3
- Views: 4845
Work Function and Threshold Energy [ENDORSED]
Hi guys! So I'm a little unclear on whether the work function and the threshold energy are the same thing? I know the work function is the energy required to remove an electron but wouldn't it be the same number as the threshold energy?
- Wed Oct 05, 2016 11:22 pm
- Forum: *Black Body Radiation
- Topic: Quiz one topics
- Replies: 7
- Views: 1515
Re: Quiz one topics
My TA told us that it'll be everything we've learned so far. Also on Professor Lavelle's website, the quiz and exam schedule is up and it says quiz 1 will cover all material from the beginning (including fundamentals) through October 7th, which is Friday's lecture (: I hope that helps!
- Sun Oct 02, 2016 9:26 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Homework problem Fundamentals E.15
- Replies: 3
- Views: 768
Re: Homework problem Fundamentals E.15
So I think what's happening is that there is no specific metal that they're asking for. So you'd start off by figuring out the mass of OH which is 34.02. You subtract that from the overall mass and it leaves you with 40.08 (the mass of Ca). Since they're asking for SULFIDE, you can add the mass of s...