## Search found 26 matches

Sat Mar 18, 2017 10:25 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Course Reader Final Practice "2016 Final" Q4 part B
Replies: 5
Views: 774

### Re: Course Reader Final Practice "2016 Final" Q4 part B

You can see that A does not work because the intermediates do not cancel out the cumulative reactants for B should be 2CLO and O2 since one of the O2's are cancelled out So the two valid ones are B&C Student B: 2ClO; O2 Student C: 2ClO; O2 you can tell that the second steps are the rate limititi...
Sat Mar 18, 2017 1:10 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Winter 2013 Final Q4B
Replies: 1
Views: 285

### Re: Winter 2013 Final Q4B

[Current] = [Initial] + [Change in initial] [O2] = [O2 initial] + [change in initial O2] Flip both equations: 1 / [O2] = 1 / ([O2 initial] + [change in initial O2]) Since Q = [Products] / [Reactants] = 1 / [O2], plug in: Q = 942.23 = 1 / ([.00117] + [Change in initial O2]) Rearrange and solve using ...
Sat Mar 18, 2017 1:06 pm
Forum: General Science Questions
Topic: Winter Final 2013 Q4
Replies: 1
Views: 489

### Re: Winter Final 2013 Q4

n is based on the total number of electrons transferred in the redox reaction. Fe2+ goes to Fe, meaning that two electrons are transferred per Fe, and there's a molar coefficient of 2, so in the net reaction we transfer 4 electrons.
Sat Mar 18, 2017 12:58 pm
Forum: *Electrophiles
Topic: Is carbon monoxide an electrophile
Replies: 1
Views: 775

### Re: Is carbon monoxide an electrophile

Carbon Monixide is an Electorphile. The C=O bond is very polar and the carbonyl carbon is very positive. The carbonyl bond is very polar. There is a partial positive charge on the carbon and a partial negative charge on the oxygen, because oxygen is more electronegative than carbon. This charge sepa...
Sat Mar 18, 2017 12:53 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Ch 14 #107
Replies: 1
Views: 335

### Re: Ch 14 #107

To relate pH to the equations we learned, E° has to be 0 when pH 7 since pH=7 when concentration of H+ and OH- are equal to 1.0 x 10^-7 mol.L^-1 when k=1 E°is 0 take ∆G°=-nFE°and ∆G°=RTlnK and then you get E°= RT/nF (lnK) at pH=7: K= [H+]/[OH-]= 1.0 x 10^-7 mol.L^-1/1.0 x 10^-7 mol.L^-1= 1 and E = 0...
Mon Feb 27, 2017 9:49 pm
Forum: General Science Questions
Topic: Chemisty 14Bl and Chemistry 14C
Replies: 2
Views: 497

### Re: Chemisty 14Bl and Chemistry 14C

There are a lot of students in my BL that are in 14C currently and many that haven't taken 14B in over a year and they're doing well!
Tue Feb 14, 2017 12:35 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7742
Views: 1060746

### Re: Post All Chemistry Jokes Here

Happy Valentine's Day!
Sun Feb 12, 2017 9:00 pm
Forum: Student Social/Study Group
Topic: Chemistry Joke
Replies: 57
Views: 2424

### Re: Chemistry Joke

Great joke!
However, you're supposed to post all chemistry jokes here:
viewtopic.php?f=156&t=4291
Mon Feb 06, 2017 5:08 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Homework 14.37
Replies: 1
Views: 295

### Re: Homework 14.37

You would use E˚cell = E˚cathode - E˚anode with E˚ at the electrodes being the the electron potential for the half reaction. 2H+ (aq, 1.0 M) +2e- ----> H2 (g, 1 atm) E˚cathode = 0 V H2 (g, 1 atm) ----> 2H+ (aq, .075 M) +2e- E˚anode = 0 V 2H+ (aq, 1.0 M) +2e- + H2 (g, 1 atm) ----> 2H+ (aq, .075 M) +2...
Sun Feb 05, 2017 4:07 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7742
Views: 1060746

### Re: Post All Chemistry Jokes Here

Enjoy!
Sun Jan 29, 2017 3:19 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7742
Views: 1060746

### Re: Post All Chemistry Jokes Here

alcohol is not a problem it's a solution
Thu Dec 01, 2016 8:01 pm
Forum: Ionic & Covalent Bonds
Topic: Polarizability
Replies: 2
Views: 323

### Re: Polarizability

1) if it is near an anion which has a high charge density (small and high charge)
2) if the cation is large since its electrons will be further away from the protons in its nucleus
Thu Dec 01, 2016 7:56 pm
Forum: Bronsted Acids & Bases
Topic: Corrosive Properties
Replies: 1
Views: 332

### Re: Corrosive Properties

Acids tend to accept electrons, and bases tend to donate electrons. Acids contain H+ ions. They tend to grab electrons and form hydrogen gas and since metals don't have a tight grip on their electrons. They give them up and the solid metal gradually disappears. The reaction is Bases contain OH- ions...
Mon Nov 28, 2016 8:06 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: HW #12.69
Replies: 1
Views: 370

### Re: HW #12.69

Al3+ forms a complex with water as ligands and since Al3+ is a Lewis acid AlCl3 gets substituted by Al(H2O)6
Mon Nov 28, 2016 7:46 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Chapter 12 Problem 117
Replies: 1
Views: 320

### Re: Chapter 12 Problem 117

A chem moderator said to omit 12.117 :)
Mon Nov 28, 2016 7:34 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When to use atm v. bar units [ENDORSED]
Replies: 4
Views: 852

### Re: When to use atm v. bar units[ENDORSED]

It would specify if the problem wanted the solution to be in bars
Sat Nov 26, 2016 12:31 pm
Forum: Amphoteric Compounds
Topic: Basic, Acidic or Amphoteric [ENDORSED]
Replies: 4
Views: 450

### Re: Basic, Acidic or Amphoteric[ENDORSED]

As2O3 is amphoteric because it can react with either acid or base.

Ex. Reaction with Acid
As2O3 we have: As2O3 + 6HCl --> 2AsCl3 + 3H2O

Reaction with base:
NaOH + As2O3 + 3H2O --> 2Na[As(OH)4]
Sat Nov 26, 2016 12:55 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 11.67
Replies: 1
Views: 375

### Re: 11.67

Reactants are strongly favored so we push the reaction as far to the left as possible and then start from the new initial conditions Pressures (bar) 2 HCl(g) -> H2(g) + Cl2(g) Original 2.0 1.0 3.0 New initial 4.0 0.0 2.0 Change -2x +x +x Final 4.0-2x +x 2.0-x K= PH2 PCl2 / PHCl2 3.2 x 10 ^-34 = x(2....
Mon Nov 14, 2016 11:12 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Concentration Units [ENDORSED]
Replies: 3
Views: 761

### Re: Equilibrium Concentration Units[ENDORSED]

You would use molarity as the units when calculating equilibrium concentrations!
Mon Nov 14, 2016 11:07 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7742
Views: 1060746

### Re: Post All Chemistry Jokes Here

-
Tue Nov 01, 2016 11:45 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7742
Views: 1060746

### Re: Post All Chemistry Jokes Here

Accurately portrays my love life
Sun Oct 30, 2016 4:01 pm
Forum: Lewis Structures
Topic: H/W Q: 3.51- The Lewis stucture of HClO?
Replies: 1
Views: 469

### Re: H/W Q: 3.51- The Lewis stucture of HClO?

HClO is an oxoacid and in oxoacids hydrogen has to be bonded with oxygen.
Thu Oct 20, 2016 10:55 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7742
Views: 1060746

### Re: Post All Chemistry Jokes Here

A photon checks into a hotel and is asked if he needs an help with his luggage.
He replies " No, I'm traveling light."
Sat Oct 15, 2016 3:48 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 3d and 4s orbitals
Replies: 2
Views: 692

### Re: 3d and 4s orbitals

3D is only lower in energy than 4s after the 4s orbital is occupied
Thu Oct 06, 2016 4:32 pm
Forum: Properties of Light
Topic: Atomic Spectra- Question 1.15 [ENDORSED]
Replies: 3
Views: 537

### Re: Atomic Spectra- Question 1.15[ENDORSED]

I solved this problem using the Rydberg equation instead of the bohr frequency condition.

You solved the n1=1 so for a line that's 102.6 nm you use the formula v=c/(lambda) = 2.922 x10^15 s^-1

Then use the Rydberg to solve for n2 which would give you n2=3
Sun Oct 02, 2016 10:23 pm
Forum: Student Social/Study Group
Topic: CHEM JOKES
Replies: 29
Views: 3690

### Re: CHEM JOKES

Do you have 11 protons? Cause your sodium fine.

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