## Search found 20 matches

Sun Mar 19, 2017 12:32 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Winter 2016 Q3C (p.207)
Replies: 3
Views: 519

### Winter 2016 Q3C (p.207)

This question asks for us to write out the cell diagram for the redox reaction, but why does the answer include AGBr(s) instead of Ag+(aq)? Isn't it supposed to be the dissociated ion and not the entire solid product? Thank you!
Sun Mar 12, 2017 11:31 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Chapter 15 Question 81
Replies: 1
Views: 822

### Re: Chapter 15 Question 81

Ok, knowing that the given information is K=326 and k(attach)=7.4x10^7 L/mol*s, you can use the equation: K = k(forward)/k(reverse) or K = k(attach)/k(loss). The rate constant of the loss of unreacted substrate will be equal to k(loss) = k(attach/K = (7.4x10^7 L/mol*s)/326 = 2.3x10^5 L/mol*s. Hope t...
Mon Mar 06, 2017 12:12 am
Forum: Administrative Questions and Class Announcements
Topic: switch 14C and BL
Replies: 2
Views: 454

### Re: switch 14C and BL

Hi! I'm totally interested in switching with you! Email me at huonglydo@gmail.com and we can settle all the details if you're still interested!
Sun Feb 26, 2017 10:11 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8047
Views: 1413236

### Re: Post All Chemistry Jokes Here

Organic chemistry is so difficult.........

People who study it have alkanes of trouble!
Sun Feb 19, 2017 11:23 pm
Forum: Zero Order Reactions
Topic: Homework Help 15.13
Replies: 2
Views: 589

### Re: Homework Help 15.13

a) Since, the units for the initial reaction rate is mol*L-1*s-1, we have to take the given values for H2 and I2 and convert them. Plugged into the reaction rate formula of rate= k*[H2]*[I2], you will get rate = (0.063 \frac{L}{mol*s})(\frac{0.52g H2}{0.750 L})(\frac{1 mol H2}{2....
Sun Feb 12, 2017 8:06 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 9.59
Replies: 1
Views: 297

### 9.59

For part a of this problem, I used the enthalpy formula, $\Delta H\doteq \sum \Delta H(products)-\sum \Delta H(reactants)$, and the same formula to calculate the entropy, but my free energy final calculation is still off. Is there a step that I am missing in the problem?
Sun Feb 05, 2017 10:38 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8047
Views: 1413236

### Re: Post All Chemistry Jokes Here

What do you call a tooth in a glass of water?

A one molar solution.
Sun Jan 29, 2017 6:40 pm
Forum: Student Social/Study Group
Topic: Formulas
Replies: 4
Views: 634

### Re: Formulas

Most, if not all, of the equations we need for thermochemistry can be found on the back of the laminated sheet that came with the purchase of the course readers!
Sun Jan 22, 2017 5:59 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Significant Figure [ENDORSED]
Replies: 7
Views: 859

### Re: Significant Figure[ENDORSED]

If I remember correctly, if you took Chem 14A with Lavelle, or know someone who has the old course reader on them, there should be one/two pages in the front of the course reader that specifically highlights what he expects from us for sig.figs. Additionally, I think the maximum points that can get ...
Sun Jan 15, 2017 2:39 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question 8.25
Replies: 1
Views: 269

### Re: Question 8.25

Because the variable that you are plugging in the 7.32 C is for the CHANGE in temperature, it doesn't matter if you convert from degrees Celsius to degrees Kelvin, the reaction is still raised by 7.32 degrees, regardless of the type of the scale of temperature behind it. The solutions manual just ch...
Sun Dec 04, 2016 1:23 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 2015 final Q7A
Replies: 1
Views: 379

### Re: 2015 final Q7A

Since you know that Ka is [HCO3-][H3O+]/[H2CO3], plug in your known values of Ka and [H3O+], and get all the numerical values on one side. What you have left on the other side is [HCO3-]/[H2CO3], the ratio of bicarbonate to carbonic acid. Solve and you have the answer!
Mon Nov 28, 2016 1:57 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When Should I use the ICE table?
Replies: 6
Views: 17871

### Re: When Should I use the ICE table?

I assume so because the ICE box is a concept that is heavily incorporated into the course reader and the practice problems we see in the workbook quizzes.
Sun Nov 20, 2016 3:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Textbook 11.7 (a)
Replies: 1
Views: 281

### Re: Textbook 11.7 (a)

The problem asks us to see when the rate of decomposition of the X2 molecules has reached equilibrium. In Flask 1 and 2, the X2 molecules continue to dissociate into X molecules. In Flask 3, about half of the X2 molecules have dissociated. Since the number of X2 molecules and X molecules don't chang...
Sun Nov 13, 2016 2:44 pm
Forum: Photoelectric Effect
Topic: Midterm question #3A
Replies: 2
Views: 512

### Re: Midterm question #3A

Because Joules is the standard unit for the photoelectric experiment, you need to convert the work function (threshold energy) from kJ/mol to just J. Since Avogadro's constant's units are 1/mol, dividing kJ/mol by 1/mol will cancel out the mol unit, leaving you with just kJ to convert to J to get th...
Sun Nov 06, 2016 9:46 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8047
Views: 1413236

### Re: Post All Chemistry Jokes Here

What do you call a bear with a dipole moment?

A polar bear!
Sat Oct 29, 2016 3:15 pm
Forum: Hybridization
Topic: s and p hybridization
Replies: 2
Views: 365

### Re: s and p hybridization

I think that we don't say s^2 because it only has one orbital available to hybridize, while p has three orbitals (px, py, and pz) available to hybridize.
Sun Oct 23, 2016 6:14 pm
Forum: Lewis Structures
Topic: Quiz 2
Replies: 1
Views: 302

### Re: Quiz 2

I think that because the geometry of molecules is not going to be on the test, you just have to use your formal charge calculations for each atom to find the most stable combination of bonds. The correct Lewis structure should be the one that has the most stability in its bonds.
Sun Oct 16, 2016 7:46 pm
Forum: Student Social/Study Group
Topic: De Neve Study Group
Replies: 35
Views: 2838

### Re: De Neve Study Group

leezashashkova wrote:Does anyone know if we'll get our first quizzes back before the next quiz?

I think we get them back during our next discussion session, along with our graded workbooks as well :)
Sun Oct 09, 2016 2:19 am
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Community Points
Replies: 11
Views: 1288

### Re: Chemistry Community Points

I'm pretty sure the deadline is midnight from Sunday night to Monday morning because the "week" technically starts with the class on Monday.
Sun Oct 02, 2016 2:02 pm
Forum: Student Social/Study Group
Topic: Dykstra Hall Study Group (Fall 2016)
Replies: 25
Views: 2081

### Re: Dykstra Hall Study Group (Fall 2016)

Hi everyone! I know I'm super late, but I'm living on Dykstra 4 and would love to join the study group (I need all the help I can get, to be honest haha). My email is huonglydo@gmail.com Thanks!