Search found 22 matches

by Julianne_Zingmond_1E
Sun Mar 19, 2017 9:06 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1010954

Re: Post All Chemistry Jokes Here

I saw someone run away with my gold, so I shouted "Hey! AU!"
by Julianne_Zingmond_1E
Sun Mar 12, 2017 10:01 pm
Forum: *Organic Reaction Mechanisms in General
Topic: delta G double dagger
Replies: 1
Views: 2363

Re: delta G double dagger

Delta G double dagger depends on the energy difference between the reactants and the transition states and regular delta G is the energy difference between the reactants and the products. I'm not aware of any equation that relates them

Hope this helps!
by Julianne_Zingmond_1E
Sun Mar 12, 2017 9:45 pm
Forum: *Alcohols
Topic: more than one functional group [ENDORSED]
Replies: 2
Views: 370

Re: more than one functional group [ENDORSED]

We do not need to know how to name organic molecules with more than one functional group. Here's another link that says the same thing near the bottom of the thread https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=89&t=13856&p=57839&hilit=functional+groups&sid=73b4fecbaca08840fde3...
by Julianne_Zingmond_1E
Sun Feb 26, 2017 9:42 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Which electrode to use?
Replies: 2
Views: 357

Re: Which electrode to use?

If there is not an electrode given, pt electrodes are inert and work perfectly. I don't think there's a situation when either of them would be favored.

Hope this helps!
by Julianne_Zingmond_1E
Sun Feb 19, 2017 9:08 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1010954

Re: Post All Chemistry Jokes Here

Did you know that you can cool yourself to -273˚C and still be 0k?
by Julianne_Zingmond_1E
Sun Feb 12, 2017 9:48 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Heat Capacity
Replies: 3
Views: 290

Re: Heat Capacity

It depends on what is given on equation sheet and what the specific problem is asking for. If only one value is given, you can always convert from grams to moles or vice versa.

Hope this helps!
by Julianne_Zingmond_1E
Sun Feb 12, 2017 9:44 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: When to use reversible work equation?
Replies: 1
Views: 220

Re: When to use reversible work equation?

As far as I'm aware, all isothermal compressions are reversible, so you can use the reversible equation for all isothermal situations. I assume that Dr. Lavelle will explicitly state irreversible/reversible(isothermal) situations in the question.
by Julianne_Zingmond_1E
Sun Feb 12, 2017 9:39 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy @ 0K
Replies: 2
Views: 262

Re: Entropy @ 0K

From my understanding, molecules that are not diatomic will have more molar entropy. However, I'm not entirely clear on the explanation for this except for the fact that the mixed element molecule is technically more complicated.
by Julianne_Zingmond_1E
Sun Feb 05, 2017 9:02 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Anode/Cathode
Replies: 4
Views: 405

Re: Anode/Cathode

The salt bridge's purpose is to prevent charge build up in the cathode. So, when ions build up in the cathode solution, the can be transferred over through the salt bridge to the anode to keep the redox reaction going. I hope this helps!
by Julianne_Zingmond_1E
Mon Jan 23, 2017 10:40 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1010954

Re: Post All Chemistry Jokes Here

Got mole problems? Call Avogadro at 602-1023.
by Julianne_Zingmond_1E
Sun Jan 15, 2017 3:20 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacities [ENDORSED]
Replies: 3
Views: 405

Re: Heat Capacities [ENDORSED]

The specific heat capacity is measured in grams or kilograms, as opposed to the molar heat capacity which is measured in moles.
by Julianne_Zingmond_1E
Sun Dec 04, 2016 11:47 am
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: 2015 Final Q7A
Replies: 1
Views: 511

Re: 2015 Final Q7A

I actually think it could be either reason, but when I'm indicating that something is more acidic, in my opinion it is more logical to say that there is an excess of acid.

I hope this helps!
by Julianne_Zingmond_1E
Mon Nov 21, 2016 11:28 am
Forum: Bronsted Acids & Bases
Topic: Protonation [ENDORSED]
Replies: 2
Views: 340

Re: Protonation [ENDORSED]

To add on, ionization refers generally to a change in number of electrons (aka a plus or minus charge on an element) and dissociation generally refers to the separation and ionization of a compound. I hope this helps!
by Julianne_Zingmond_1E
Tue Nov 15, 2016 9:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: calculating Kc [ENDORSED]
Replies: 3
Views: 338

Re: calculating Kc [ENDORSED]

I won't solve the problem for you, but the idea of this problem is that it gives the initial and final concentrations of BrCl, and therefore you can find the concentrations of the other products at equilibrium and find Kc.The material that will be covered on quiz 3 is only the basics of equilibrium....
by Julianne_Zingmond_1E
Mon Nov 14, 2016 11:32 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Concentration Units [ENDORSED]
Replies: 3
Views: 730

Re: Equilibrium Concentration Units [ENDORSED]

Just to clarify further, you do not need to put unit n/V or M inside brackets when calculating K or Q for aqueous solutions because the brackets indicate that you are calculating K/Q based on molarity. For pressure on the other hand, when you put the values into the K/Q calculation, it would be wise...
by Julianne_Zingmond_1E
Sun Nov 13, 2016 12:26 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Difference between Pressure and compression/expansion?
Replies: 5
Views: 2112

Re: Difference between Pressure and compression/expansion?

Theoretically, if the gas has room to expand, the pressure would decrease. If the volume decreases and the gas is compressed, the pressure would increase. This is all based off of the ideal gas equation of PV=nRT, where P and V are inversely related.
by Julianne_Zingmond_1E
Mon Oct 31, 2016 10:16 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Shapes
Replies: 6
Views: 552

Re: Shapes

To add on, even though we do consider the lone pairs as fields of electron density that affect the bond angles and shape of a molecule, we only consider the position of the bound electron pairs when we name the shape of a molecule.
by Julianne_Zingmond_1E
Wed Oct 26, 2016 9:37 am
Forum: General Science Questions
Topic: Past Quizzes (2)
Replies: 1
Views: 561

Re: Past Quizzes (2)

Some of the preparation quizzes cover chapter 4 information, so we won't be tested on concepts we haven't discussed yet. Check out this link for more information https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=30&t=16106 I don't have any good memorization tips, but the website ptable.com hel...
by Julianne_Zingmond_1E
Mon Oct 17, 2016 9:09 am
Forum: *Shrodinger Equation
Topic: Still confused on the definition of shrodinger's equation?
Replies: 1
Views: 367

Re: Still confused on the definition of shrodinger's equation?

As far as I know, Schrodinger's equation is only useful to us in the sense that the equation describes wave functions. Then, the wave function describes electrons in an atom and therefore orbitals the electrons are in. I don't believe we'll be doing any calculations with it.

Hope this helps!
by Julianne_Zingmond_1E
Mon Oct 10, 2016 10:45 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration [ENDORSED]
Replies: 4
Views: 425

Re: Electron Configuration [ENDORSED]

When we determine values for ml , the values possible are integers within -l and +l. So for example, when l=2, the possible ml values will be -2(which is -l), -1, 0, +1, and +2(which is +l).

Hope this helps!
by Julianne_Zingmond_1E
Mon Oct 03, 2016 4:32 pm
Forum: Einstein Equation
Topic: Simplifying De Broglie's wavelength equation [ENDORSED]
Replies: 1
Views: 396

Re: Simplifying De Broglie's wavelength equation [ENDORSED]

You're right about the units for joules, but the units for Planck's constant are J x s. So therefore you end up with (kg x m^s x s^-2 x s)/(kg x m x s^-1), and you end up with wavelength in meters.
by Julianne_Zingmond_1E
Fri Sep 30, 2016 8:29 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Formula [ENDORSED]
Replies: 3
Views: 464

Re: Rydberg Formula [ENDORSED]

I think that you can use the wavelength to determine the first n value. The wavelength indicates either the Balmer series or the Lyman series and each series has a specific n1 value. These values are in the text on pg 8 of the textbook(6th edition).

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