Search found 16 matches
- Sun Mar 19, 2017 9:55 am
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Details and Review Sessions Winter 2017
- Replies: 114
- Views: 26513
Re: Final Exam Details and Review Sessions Winter 2017
Here is the final review session video. If you cannot see the video, that is okay. You will be able to soon. There were some technical difficulties, but Dr. Lavelle, Jonathan, and I are getting through it. Hopefully, the video the other student recorded will be posted soon as well. Thank you for fi...
- Wed Mar 15, 2017 6:46 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Practice Problems
- Replies: 16
- Views: 3832
Re: Practice Problems
For the second molecule (when drawing Newman projection), why does the one with the lowest energy have hydrogens on the same side? As opposed to putting one hydrogen on the left and one on the right.
- Wed Mar 15, 2017 6:22 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Organic Chemistry Textbook Self-Test 3.3B
- Replies: 1
- Views: 543
Organic Chemistry Textbook Self-Test 3.3B
For part a.) of this question, it asks "Draw a Newman projection for the gauche conformation of 1-iodobutane." Can someone please help me figure out how to draw this? There is a solution in the back of the book but I don't understand which C-C bond it is looking down. I started by drawing ...
- Wed Mar 08, 2017 12:12 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: 15.67
- Replies: 2
- Views: 665
Re: 15.67
Wow, that post was super helpful, thanks for linking it!
- Wed Mar 08, 2017 12:07 pm
- Forum: *Free Energy of Activation vs Activation Energy
- Topic: Homework question 4.30
- Replies: 2
- Views: 1378
Re: Homework question 4.30
I think it's just a fact/concept that we need to know. In a different post Dr.Lavelle said that it's written on page 154 of the organic chemistry textbook (3rd paragraph from the bottom). Hopefully that page can help a bit!
- Wed Mar 08, 2017 12:44 am
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 3 Winter 2017
- Replies: 183
- Views: 29011
Re: Quiz 3 Winter 2017
For question number 2, can someone explain how ethyl & methyl are on the 3rd carbon? And what does it mean by the third carbon in the hexane line structure? A description or picture would be greatly appreciated!
- Sun Feb 26, 2017 9:51 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2996674
- Wed Feb 22, 2017 7:56 am
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2 Winter 2017
- Replies: 160
- Views: 24172
Re: Quiz 2 Winter 2017
For #3, it is a first order reaction, so you use the corresponding equation ln[A] = -kt + ln[A0] so, ln(.33) = -(.0068)t + ln(.75) ln(.33/.75) = -.0068t t = ln(.33/.75)/-.0068 t = 120 sec Thank you! I had the same question the answer I got was 120.73... are we not suppose to round to three sig figs...
- Sun Jan 29, 2017 9:28 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: General questions [ENDORSED]
- Replies: 4
- Views: 1101
Re: General questions [ENDORSED]
For number 4:
In Lavelle's lecture (on January 20), he mentions that 3/2 comes from... "if you take a gas molecule it can move in 3 dimensions (x,y,z), which is .5+.5+.5 which gives you 3/2". Hopefully that helps clarify it a little!
In Lavelle's lecture (on January 20), he mentions that 3/2 comes from... "if you take a gas molecule it can move in 3 dimensions (x,y,z), which is .5+.5+.5 which gives you 3/2". Hopefully that helps clarify it a little!
- Sun Jan 22, 2017 4:20 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Examples of Isolated systems [ENDORSED]
- Replies: 3
- Views: 3470
Re: Examples of Isolated systems [ENDORSED]
My understanding is that in a closed system, you can only have an exchange/transfer in energy (heat), but not in mass.
- Sun Jan 15, 2017 8:43 pm
- Forum: Phase Changes & Related Calculations
- Topic: Triple Point
- Replies: 3
- Views: 749
Re: Triple Point
As a follow-up question, can the triple point occur for other molecules?
- Sun Dec 04, 2016 11:58 am
- Forum: *Titrations & Titration Calculations
- Topic: Titration Problem 8D - 2015 Final
- Replies: 1
- Views: 1092
Titration Problem 8D - 2015 Final
Can someone please write out the chemical equation for the following problem and clarify how the titration works please? The question is 8D from the 2015 Final, and it states: "During a strong-base strong-acid titration calculate the pH when 49.00mL of 0.100M NaOH has been added to 50.00mL of 0...
- Sat Nov 26, 2016 9:07 pm
- Forum: Naming
- Topic: Naming Coordination Compounds
- Replies: 5
- Views: 1245
Re: Naming Coordination Compounds
I have a quick follow up question about naming coordination compounds!
How do we know when to use the latin name of certain metals vs when to just use their normal names?
For example, when is iron called ferrate?
Thanks in advance!
How do we know when to use the latin name of certain metals vs when to just use their normal names?
For example, when is iron called ferrate?
Thanks in advance!
- Sat Nov 19, 2016 10:59 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Fall 2016 Final Q7A
- Replies: 1
- Views: 424
Fall 2016 Final Q7A
The question states: "A patient died due to a blood pH of 6.5. Is this a result of acidosis or alkalosis? Based on the above overall reaction, what was a possible cause of this low pH?" The overall reaction is: CO 2 +2H 2 O = H 2 CO 3 + H 2 O = H 3 O + + HCO 3 - My question is: how do you ...
- Sun Nov 13, 2016 6:11 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Quiz 3 Prep: Fall 2014 #8
- Replies: 1
- Views: 428
Quiz 3 Prep: Fall 2014 #8
Question #8 from the Fall 2014 quiz 3 prep asks: For the following reaction, if initially 0.100 mol of H 2 O (g) is placed in a 4.0 L vessel, what is the equilibrium partial pressures of each reactant and of each product? H 2 O (g) + C(s) --> H 2 (g) + CO (g) Kp= 3.72 at 1000K Can someone please exp...
- Sat Nov 05, 2016 11:18 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Order Overview [ENDORSED]
- Replies: 1
- Views: 375
Bond Order Overview [ENDORSED]
Can someone please explain what bond order is and why we would need to find it? How is calculating the bond order helpful?