Search found 21 matches

by SaniShabgahi3N
Sat Mar 18, 2017 10:46 pm
Forum: *Alkenes
Topic: #7B
Replies: 1
Views: 437

Re: #7B

Sorry I meant 7B on the 2016 final
by SaniShabgahi3N
Sat Mar 18, 2017 10:45 pm
Forum: *Alkenes
Topic: #7B
Replies: 1
Views: 437

#7B

Why does the second organic molecule have an E in it? 8 know E means that the atoms with the highest atomic number are opposite of each other but which atoms are being compared in the molecule?
by SaniShabgahi3N
Mon Mar 06, 2017 6:25 pm
Forum: *Alkenes
Topic: 1.26
Replies: 2
Views: 466

1.26

I got the name correctly; however, I don't understand why there is a E. I know E means that the groups are across from each other. But what groups are identical and across from each other in that alkene?
by SaniShabgahi3N
Sun Mar 05, 2017 9:50 pm
Forum: *Alkanes
Topic: Which structure?
Replies: 2
Views: 216

Which structure?

When it asks to "draw the structure," are we expected to draw the line structure or Lewis structure?
by SaniShabgahi3N
Sun Mar 05, 2017 8:49 pm
Forum: *Alkynes
Topic: 1.5 (c)
Replies: 3
Views: 522

1.5 (c)

How can you tell that the three lines are an alkyne and that the molecular formula is C3H4? I don't physically see this
by SaniShabgahi3N
Sun Feb 26, 2017 11:20 pm
Forum: *Nucleophiles
Topic: Nucleophilic strength
Replies: 1
Views: 256

Nucleophilic strength

Does nucleophiloc strength rely on polarizability? And if yes, does polarizability increase down a group?
by SaniShabgahi3N
Mon Feb 20, 2017 6:51 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Book problems for quiz 2?
Replies: 1
Views: 223

Book problems for quiz 2?

Should we go up to question 55 in order to prepare for quiz two?
by SaniShabgahi3N
Sun Feb 12, 2017 7:12 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Midterm 2015 #6
Replies: 1
Views: 218

Midterm 2015 #6

Given these following reduction half reactions:
I2(S) + 2e- -> 2I-(aq) E• = 0.54v
Cl2(g) + 2e- -> 2Cl-(aq) E• = 1.36
Calculate E•, deltaG• and k at 25•C
In order to determine the K, the solution says to use DeltaG•= -RTlnK

Why can't we use E• = RT/nF lnK? I used that and got a different answer
by SaniShabgahi3N
Sun Feb 05, 2017 11:52 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic cell vs electrolytic cell [ENDORSED]
Replies: 2
Views: 267

Galvanic cell vs electrolytic cell [ENDORSED]

What's the difference between a galvanic cell and a electrolytic cell?
by SaniShabgahi3N
Sun Jan 29, 2017 11:46 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 9.25
Replies: 1
Views: 283

9.25

If SO2F2 adopts a positionally disordered arrangement in its crystal form, what might its residual entropy be?
by SaniShabgahi3N
Sun Jan 22, 2017 9:06 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: #75
Replies: 1
Views: 208

#75

Use the bond enthalpies in tables 8.6 and 8.7 to estimate the reaction enthalpy for CH3CHCH2(g) +H2O(g) --> CH3CH(OH)CH3(g). I know for the bonds broken, it's one double bond between two carbon atoms and 1 bond between O and H. However, for the bonds formed, I got one C-H bond, one C double bonded t...
by SaniShabgahi3N
Sun Jan 15, 2017 10:21 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Extensive property vs Intensive property [ENDORSED]
Replies: 1
Views: 232

Extensive property vs Intensive property [ENDORSED]

Why is heat capacity an extensive property, while the specific heat capacity and molar heat capacity are intensive properties?
by SaniShabgahi3N
Sun Dec 04, 2016 10:25 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 900000

Re: Post All Chemistry Jokes Here

If a king farts, is it a noble gas?
by SaniShabgahi3N
Sun Nov 20, 2016 5:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium constant help
Replies: 1
Views: 206

Equilibrium constant help

Do equilibrium constants (KC) exclude liquids and solids? And if yes, is it the same as the Kp (thinking back to the most recent quiz we took)?
by SaniShabgahi3N
Sun Nov 13, 2016 7:39 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Difference between VSEPR and MOT
Replies: 3
Views: 2152

Difference between VSEPR and MOT

What's the difference between VSEPR and the Molecular Orbital Theory?
by SaniShabgahi3N
Fri Nov 04, 2016 9:35 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 900000

Re: Post All Chemistry Jokes Here

Here are some chemistry pick up lines so you are prepared just in case an attractive person sits next to you during the chemistry lecture. Do you have 11 protons? Cause you're sodium fine. Are you made of copper and tellurium? Because you're cute. You must be a compound of beryllium and barium...bec...
by SaniShabgahi3N
Sat Oct 29, 2016 11:50 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: #17
Replies: 1
Views: 213

#17

Predict the bond angles at the central atom of the following molecules and ions. a) O3
by SaniShabgahi3N
Fri Oct 21, 2016 6:30 pm
Forum: Hybridization
Topic: textbook problem #19e
Replies: 1
Views: 272

textbook problem #19e

Give the ground-state electron configuration and number of unpaired electrons expected for each of the following ions. e) Ni2+
I just want someone to explain to me again why it's [Ar] 3d8 instead of [Ar] 3d6 4s2
by SaniShabgahi3N
Fri Oct 14, 2016 4:33 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Chapter 1 question 45
Replies: 2
Views: 291

Chapter 1 question 45

A bowling ball of mass 8.00 kg is rolled down a bowling alley lane at 5.00 +/- 5.0 ms^-1. What is the minimum uncertainty in its position?
by SaniShabgahi3N
Tue Oct 04, 2016 10:58 pm
Forum: DeBroglie Equation
Topic: Post Module Question [ENDORSED]
Replies: 3
Views: 416

Post Module Question [ENDORSED]

If an electron (mass 9.11 x 10-31 kg) has an associated wavelength of 7.28 x 10-9 m, what is its speed? Is your answer reasonable, why?
I continue getting the answer 1.00x10^4 and don't understand what I did wrong. Also, how would I know if the answer is reasonable compared to the speed of light.
by SaniShabgahi3N
Wed Sep 28, 2016 11:18 am
Forum: Significant Figures
Topic: Significant figures for Logarithms
Replies: 1
Views: 316

Significant figures for Logarithms

Can someone please explain the rules of significant figures for logarithms?

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