Search found 40 matches

by MichelleTran 1I
Fri Mar 15, 2019 9:03 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017162

Re: Post All Chemistry Jokes Here

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by MichelleTran 1I
Fri Mar 15, 2019 9:02 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017162

Re: Post All Chemistry Jokes Here

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by MichelleTran 1I
Fri Mar 15, 2019 9:01 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017162

Re: Post All Chemistry Jokes Here

A chemistry lab is a lot like a party! Some drop acid, some drop the bass.
by MichelleTran 1I
Mon Mar 04, 2019 10:07 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017162

Re: Post All Chemistry Jokes Here

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by MichelleTran 1I
Mon Mar 04, 2019 10:05 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017162

Re: Post All Chemistry Jokes Here

Chemistry is a lot like cooking, only you really shouldn't lick the spoon.
by MichelleTran 1I
Mon Mar 04, 2019 10:04 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017162

Re: Post All Chemistry Jokes Here

Why do chemists learn about ammonia first?

It's pretty basic, really.
by MichelleTran 1I
Sat Feb 23, 2019 10:01 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017162

Re: Post All Chemistry Jokes Here

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by MichelleTran 1I
Sat Feb 23, 2019 9:59 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017162

Re: Post All Chemistry Jokes Here

Are you full of beryllium, gold, and titanium? Because you're Be-Au-Ti-ful!
by MichelleTran 1I
Sat Feb 23, 2019 9:57 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017162

Re: Post All Chemistry Jokes Here

If a king farts, is it a noble gas?
by MichelleTran 1I
Thu Feb 14, 2019 10:46 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017162

Re: Post All Chemistry Jokes Here

I can't trust atoms anymore, I heard they make up everything.
by MichelleTran 1I
Thu Feb 14, 2019 10:42 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: intensive and extensive
Replies: 2
Views: 238

Re: intensive and extensive

An extensive property means that the value you get depends on how much you have of it, for example, volume is an extensive property because how many liters, mL, etc. you have of it determines the volume. On the other hand, intensive properties are constant, no matter how much you have of it. E.g. Wa...
by MichelleTran 1I
Thu Feb 14, 2019 10:39 pm
Forum: Administrative Questions and Class Announcements
Topic: Lyndon's HOTDOG MIDTERM REVIEW SESSION!! FINALLY!
Replies: 49
Views: 3022

Re: Lyndon's HOTDOG MIDTERM REVIEW SESSION!! FINALLY!

Thanks again Lyndon for the practice exam! Helped a lot! C:
by MichelleTran 1I
Mon Feb 11, 2019 12:12 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Midterm #1 14B
Replies: 17
Views: 550

Re: Midterm #1 14B

Are worksheets from other TA's/LA/UA's available on the chemistry community?
by MichelleTran 1I
Mon Feb 11, 2019 12:10 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Midterm 2019
Replies: 9
Views: 193

Re: Midterm 2019

The midterm covers everything up to last Friday's lecture, so Chemical Equilibrium, Acid and Base Equilibria, Thermochemistry, Thermodynamics to the end of entropy, but not including Gibb's free energy.
by MichelleTran 1I
Mon Feb 11, 2019 12:08 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond enthalpies
Replies: 10
Views: 163

Re: Bond enthalpies

I think knowing them will be helpful, but the BDE would probably be given on the test/in a table maybe? That's how it's been for the examples we worked on in class and such.
by MichelleTran 1I
Mon Feb 11, 2019 12:01 am
Forum: Administrative Questions and Class Announcements
Topic: Lyndon's HOTDOG MIDTERM REVIEW SESSION!! FINALLY!
Replies: 49
Views: 3022

Re: Lyndon's HOTDOG MIDTERM REVIEW SESSION!! FINALLY!

Thanks for posting this again, Lyndon! See you tomorrow at the review session!
by MichelleTran 1I
Sat Feb 02, 2019 9:25 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017162

Re: Post All Chemistry Jokes Here

What is Cesium and Iodine's favorite drama?

CSI C:
by MichelleTran 1I
Sat Feb 02, 2019 9:24 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017162

Re: Post All Chemistry Jokes Here

An acid with an attitude is jut an a-mean-o-acid
by MichelleTran 1I
Sat Feb 02, 2019 9:22 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017162

Re: Post All Chemistry Jokes Here

I told a chemistry joke on here once, but I didn't get a reaction :C
by MichelleTran 1I
Sat Jan 12, 2019 12:06 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Changing Pressure
Replies: 6
Views: 127

Re: Changing Pressure

Pressure and volume have an inverse relationship, therefore if you want to change the pressure within the reaction you have to change the volume of the container. To increase the pressure, volume must decrease, so that particles within the container are more squished together, creating greater press...
by MichelleTran 1I
Sat Jan 12, 2019 12:01 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating Kc
Replies: 4
Views: 95

Re: Calculating Kc

Though the concentrations don't affect Kc, the coefficients in a balanced equation are needed to calculate the equilibrium constant. You need to raise the concentrations to the power of how many mols are in the reaction.
by MichelleTran 1I
Fri Jan 11, 2019 11:56 pm
Forum: Ideal Gases
Topic: Q and K [ENDORSED]
Replies: 35
Views: 1190

Re: Q and K [ENDORSED]

The formulae themselves have no difference, but K is only used when the chemical reaction is at equilibrium. Using the equation with Q helps you determine whether the reaction goes forward or in reverse to reach equilibrium.
by MichelleTran 1I
Sun Nov 25, 2018 1:10 pm
Forum: Octet Exceptions
Topic: Octet vs formal charge
Replies: 16
Views: 582

Re: Octet vs formal charge

Having the lowest formal charge is more important because the molecule will be more stable overall. There are some exceptions to the octet rule as well, so generally, following the rule of lowest formal charge would be the better bet.
by MichelleTran 1I
Sun Nov 25, 2018 12:53 pm
Forum: Octet Exceptions
Topic: The center atom
Replies: 20
Views: 618

Re: The center atom

Cl is the least electronegative atom in the molecule, but since it has 7 valence electrons, it only has room left for one electron to complete the shell. It's more stable overall to have oxygen in the middle of the molecule.
by MichelleTran 1I
Sun Nov 25, 2018 12:40 pm
Forum: Octet Exceptions
Topic: Exceptions
Replies: 3
Views: 261

Re: Exceptions

The Octet Rule guideline only applies to period 2 elements because they must completely fill the second shell to achieve a stable state. The following elements on increasing period have the option to fill an additional d-orbital, so they are not confined to the Octet Rule.
by MichelleTran 1I
Fri Nov 02, 2018 8:43 pm
Forum: Photoelectric Effect
Topic: Chem Test 2, #5 b
Replies: 4
Views: 192

Re: Chem Test 2, #5 b

For that one, you would have to say no, because depending on the work function of the Hg atom, only certain wavelengths will be emitted when an e- reaches a certain energy level. In other words, atoms have discrete energy values, and if the wavelength emitted is not that value, then the atoms will n...
by MichelleTran 1I
Fri Nov 02, 2018 8:41 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molar Mass
Replies: 8
Views: 553

Re: Molar Mass

Each element on the periodic table has their molar mass listed below the atomic symbol. The units are in g/mol!
by MichelleTran 1I
Fri Nov 02, 2018 8:39 pm
Forum: SI Units, Unit Conversions
Topic: Molar Mass to Kg
Replies: 6
Views: 347

Re: Molar Mass to Kg

You would need to divide by Avogadro's number to get the weight in grams and then multiply by 10^3 to convert to kg. But I'm assuming that if you're converting the mass, the mass of the element is given?
by MichelleTran 1I
Wed Oct 24, 2018 6:58 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 7
Views: 181

Re: Rydberg Equation

Would we use the E= -hr/n^2 along with E=hv to solve for nu and the subsequently c=lambda*nu to find wavelength?
by MichelleTran 1I
Wed Oct 24, 2018 6:54 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Wave functions
Replies: 4
Views: 102

Re: Wave functions

I think it's the other way around. Through the wave functions and Schrodinger's equations, you are able to get the quantum numbers for each electron in an atom (n, l, m(l)). However, Lavelle has said we won't be doing Schrodinger's for this test.
by MichelleTran 1I
Wed Oct 24, 2018 6:52 pm
Forum: Properties of Light
Topic: kg or g [ENDORSED]
Replies: 11
Views: 302

Re: kg or g [ENDORSED]

I remember in class Lavelle said he wanted us to use kg since it is the SI unit for mass. That way, with all the equations the units will be able to cancel out.
by MichelleTran 1I
Sat Oct 20, 2018 4:51 pm
Forum: Properties of Light
Topic: 3 Posts on Chemistry Community [ENDORSED]
Replies: 5
Views: 106

Re: 3 Posts on Chemistry Community [ENDORSED]

I've only ever heard that we need to post three questions or comments by Sunday. I think the new week starts each Monday, since Sunday is the last day to post. You can create your own post by going into Chem 14A > [A Topic, e.g. "The Quantum World"]> and then hitting "New Topic" ...
by MichelleTran 1I
Sat Oct 20, 2018 4:28 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Symmetry in electron density distribution
Replies: 3
Views: 214

Re: Symmetry in electron density distribution

In symmetrical electron density distribution, the likelihood of finding an electron in any given point within the orbital is relatively the same. In asymmetrical electron density distribution, there are certain areas where it is less likely to find an electron. For example, in the nodal plane, the l...
by MichelleTran 1I
Sat Oct 20, 2018 4:25 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Superscript
Replies: 3
Views: 48

Re: Superscript

In electron configuration, a superscript indicates the number of electrons occupying each orbital. So in your example, it means two electrons are in the 2S orbital.
by MichelleTran 1I
Sun Oct 14, 2018 11:48 pm
Forum: Properties of Light
Topic: Units for Wavelength
Replies: 7
Views: 111

Re: Units for Wavelength

I would ask your TA which they would prefer, but technically speaking, as long as you notate it correctly as nm, or x10^-9 m it should be fine, since they both mean the same thing.
by MichelleTran 1I
Sun Oct 14, 2018 11:43 pm
Forum: Einstein Equation
Topic: Symbol for frequency
Replies: 12
Views: 246

Re: Symbol for frequency

It's best to just stick with what the textbook and Dr. Lavelle has been using in class, "v" (nu).
by MichelleTran 1I
Sun Oct 14, 2018 11:42 pm
Forum: Photoelectric Effect
Topic: Threshold energy [ENDORSED]
Replies: 17
Views: 454

Re: Threshold energy [ENDORSED]

Each atom has a minimum amount of energy needed for an electron to be released. That is the threshold amount of energy needed. Any energy more than that is excess and is given to the electron that is released. It is not used in calculating the energy of a photon.
by MichelleTran 1I
Sat Oct 06, 2018 9:39 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017162

Re: Post All Chemistry Jokes Here

A chemist and his friend go into a bar. The chemist says "I'll have some h2o, please." His friend says, "I'll have some h2o, too." His friend is now dead.
by MichelleTran 1I
Sat Oct 06, 2018 9:36 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical formula set up
Replies: 9
Views: 197

Re: Empirical formula set up

If you use 100g, you don't have to worry about having to calculate percentages and using complicated numbers, it speeds up the process without doing too many extra steps!
by MichelleTran 1I
Sat Oct 06, 2018 9:33 pm
Forum: SI Units, Unit Conversions
Topic: Modules?
Replies: 8
Views: 185

Re: Modules?

I thought I heard someone say they were supposed to be done by week 2? But then again, it also says the modules are done anonymously?

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