Search found 27 matches

by Sina Rahmani 4A
Fri Mar 11, 2016 10:13 pm
Forum: *Alkenes
Topic: I AM DYING! PLEASE HELP ME!
Replies: 3
Views: 517

Re: I AM DYING! PLEASE HELP ME!

haha I love how you advised counseling to me xD
by Sina Rahmani 4A
Wed Mar 09, 2016 7:16 pm
Forum: *Alkenes
Topic: I AM DYING! PLEASE HELP ME!
Replies: 3
Views: 517

I AM DYING! PLEASE HELP ME!

tricked you, didn't I?
by Sina Rahmani 4A
Fri Mar 04, 2016 5:18 pm
Forum: *Haloalkanes
Topic: CH2I?
Replies: 2
Views: 934

CH2I?

why is CH2I called Iodomethyl? I thought CH3I would be Iodomethyl. Thanks!
by Sina Rahmani 4A
Thu Feb 25, 2016 9:48 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: My Girlfriend's Water Broke O_o
Replies: 1
Views: 369

My Girlfriend's Water Broke O_o

Well yeah... we were too late... :(
by Sina Rahmani 4A
Fri Feb 19, 2016 6:09 pm
Forum: General Rate Laws
Topic: Difference Between General Rate Laws and Rate=k[A]^n
Replies: 2
Views: 522

Re: Difference Between General Rate Laws and Rate=k[A]^n

THEY ARE THE SAME! JUST DIFFERENT FORMS.
by Sina Rahmani 4A
Fri Feb 12, 2016 9:59 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Gibbs Free Energy for Ideal Gases
Replies: 1
Views: 409

Gibbs Free Energy for Ideal Gases

Is the gibbs free energy for ideal gases always zero? please explain why
by Sina Rahmani 4A
Wed Jan 27, 2016 7:48 pm
Forum: Phase Changes & Related Calculations
Topic: CONSTANT TEMPERATURE?
Replies: 2
Views: 414

CONSTANT TEMPERATURE?

Why does a phase change occur at constant temperature if heat is being added?
by Sina Rahmani 4A
Wed Jan 27, 2016 12:12 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.67
Replies: 1
Views: 322

8.67

For part A on chapter 8, number 67, why is the equation
H2 + 1/2 O2 --> H2O
as opposed to
2H2 + O2 --> 2H2O
by Sina Rahmani 4A
Fri Jan 22, 2016 6:25 pm
Forum: Phase Changes & Related Calculations
Topic: Molar Kinetic Energy?
Replies: 1
Views: 1225

Molar Kinetic Energy?

Chapter 8, question 103 asks to calculate the molar kinetic energy. The Students' Solution Manual says to use the equation 3/2*RT. Can someone derive this equation please? I understand that the units of R (J*/(K*mol)) and T (K) end up becoming J/mol when multiplied together. But where did this equat...
by Sina Rahmani 4A
Tue Jan 19, 2016 4:14 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Perfect System
Replies: 3
Views: 618

Re: Perfect System

It doesn't really matter, since it's just arithmetic. Your focus should be on the system, so that's why surroundings is usually negative.
by Sina Rahmani 4A
Mon Jan 18, 2016 8:56 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Entropy Joke
Replies: 1
Views: 507

Entropy Joke

There's so much disorder that I don't understand the joke!
by Sina Rahmani 4A
Wed Jan 13, 2016 11:21 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: INFINITE ENERGY JOKE
Replies: 1
Views: 325

INFINITE ENERGY JOKE

Thermodynamics can't explain video game logic.
by Sina Rahmani 4A
Fri Jan 08, 2016 11:20 am
Forum: Phase Changes & Related Calculations
Topic: Thermochemistry Joke #1
Replies: 1
Views: 847

Thermochemistry Joke #1

Starting week 1 off with a simple joke
by Sina Rahmani 4A
Fri Dec 04, 2015 2:59 pm
Forum: Empirical & Molecular Formulas
Topic: Final Set of Jokes
Replies: 3
Views: 557

Final Set of Jokes

Best set of jokes for the end of the quarter. Enjoy :)
by Sina Rahmani 4A
Wed Dec 02, 2015 9:18 am
Forum: *Titrations & Titration Calculations
Topic: Solutions Joke
Replies: 1
Views: 424

Solutions Joke

Just a cheesy joke I found while surfing the web. If it's hard to read the text it goes like this: Top Left: Solvent - "I like you, but we're from different states. It'll never work" Top Right: Solvent - "We can't be together" Bottom Left: Solute - "Oh, but we can" Bott...
by Sina Rahmani 4A
Fri Nov 20, 2015 3:08 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Electron Uncertainty Joke
Replies: 1
Views: 468

Electron Uncertainty Joke

Electrons are such a tease.
by Sina Rahmani 4A
Sun Nov 15, 2015 12:26 pm
Forum: Ideal Gases
Topic: PV=nRT
Replies: 2
Views: 758

Re: PV=nRT

PV=nRT Let's say nRT equals some constant 20. So now we have PV=20. Let's also say P=10 and V=2. Now if we double the volume, with your logic the pressure should also double. If that happens, P=20, V=4 --> 20x4=80 But we said PV=20 So if Volume doubles, Pressure halves. P=5, V=4 --> 5x4=20 Mathemati...
by Sina Rahmani 4A
Sun Nov 15, 2015 12:19 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Endothermic/Exothermic vs Endergonic/Exergonic
Replies: 1
Views: 761

Endothermic/Exothermic vs Endergonic/Exergonic

Is there a major difference between endothermic and endergonic? Graphically, they look the same to me. The former deals with an "Enthalpy vs Coordination Reaction" graph while the latter deals with a "Free Energy vs Coordination Reaction" graph. But do they function similarly?
by Sina Rahmani 4A
Sun Nov 15, 2015 12:13 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand Definition and Coordination Number
Replies: 2
Views: 806

Re: Ligand Definition and Coordination Number

A ligand can be either an atom or a molecule that binds to a transition metal.

I'm not sure about the coordination number though. :/
by Sina Rahmani 4A
Thu Nov 05, 2015 1:32 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Can oxalate ion be monodentate?
Replies: 1
Views: 519

Re: Can oxalate ion be monodentate?

My best guess (I could be wrong) is that carbonic acid can easily lose hydrogen because of the multiple resonance structures it will have. More resonance means more stability. Perhaps carbonate has more resonance when it forms one bond compared to oxalate. That's just a possibility. I'm not exactly ...
by Sina Rahmani 4A
Thu Nov 05, 2015 1:26 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: CIS/TRANS - NEVER FORGET IT AGAIN!!!
Replies: 2
Views: 408

CIS/TRANS - NEVER FORGET IT AGAIN!!!

CLsbGTDUEAARpLt.jpg

If you cannot remember the difference between CIS and TRANS, you will never forget again!
by Sina Rahmani 4A
Fri Oct 30, 2015 10:21 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Quiz 2 preparation
Replies: 1
Views: 850

Re: Quiz 2 preparation

Oxygen has 2 unpaired electrons while Nitrogen has 3. If you look at both of their 2P orbitals, Nitrogen has all of them half filled, which is more stable than Oxygen, which has 2 of of them half filled and one of them full. I'm assuming that the stability Oxygen gets when it loses its one electron ...
by Sina Rahmani 4A
Fri Oct 23, 2015 11:53 am
Forum: Octet Exceptions
Topic: Why does Sulfur accommodate expanded octet?
Replies: 2
Views: 3765

Re: Why does Sulfur accommodate expanded octet?

Sulfur may be in the same group as Oxygen, but it is in a period below Oxygen. This extra period correlates to an extra energy level. Sulfur is in the 3rd period, meaning it has a highest energy level of n=3. This means Sulfur has access to the 3s, 3p, and 3d orbitals. Oxygen, however, only has acce...
by Sina Rahmani 4A
Thu Oct 15, 2015 11:35 am
Forum: Formal Charge and Oxidation Numbers
Topic: Chlorine and Oxidation States
Replies: 5
Views: 3015

Re: Chlorine and Oxidation States

I just looked at the noble gas before and after Chlorine (Neon and Argon, respectively). Neon is 7 electrons less than Chlorine, so Chlorine's maximum oxidation state would be +7. It's +7 and not -7, because Chlorine would have to LOSE 7 electrons to equate the number of electrons that Neon has. Alt...
by Sina Rahmani 4A
Tue Oct 06, 2015 2:56 pm
Forum: Quantum Numbers and The H-Atom
Topic: energy of electron in H-Atom
Replies: 2
Views: 408

Re: energy of electron in H-Atom

Yes. Imagine going from -3 to -2 on a number scale. You are increasing the value by positive 1. Hence, you are INCREASING. When n approaches infinity, the energy of the electron becomes zero, as you said. However, at ground state, the electron has some negative value. Increasing the energy levels ge...
by Sina Rahmani 4A
Fri Oct 02, 2015 11:20 am
Forum: Properties of Light
Topic: % Yield
Replies: 5
Views: 1111

Re: % Yield

Theoretical yield is the amount of a substance one has at the end of an experimental calculation. So whenever you are solving problems, the answer you find when you do all of those mole conversions is the THEORETICAL. The actual yield is the one found in the lab, and the point of the percent yield i...

Go to advanced search