Search found 19 matches

by Rachel Risoleo 3G
Sun Mar 13, 2016 10:49 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam - snacks?
Replies: 3
Views: 844

Re: Final Exam - snacks?

I think snacks would be appropriate. Definitely pop tarts are okay. Chips might be a bit inconsiderate.
by Rachel Risoleo 3G
Thu Mar 10, 2016 9:56 pm
Forum: Calculating Work of Expansion
Topic: work and state function
Replies: 1
Views: 293

work and state function

Is work a pathway function rather than a state function? If so, why is it that we can sometimes add the work of different steps to get the overall work for the reaction?
by Rachel Risoleo 3G
Sun Mar 06, 2016 10:08 pm
Forum: *Nucleophilic Substitution
Topic: SN2
Replies: 2
Views: 665

Re: SN2

An SN2 reaction is a single-step mechanism substitution reaction. An electrophilic addition reaction's primary identifying characteristic is the addition of an electrophile to a larger molecule.
by Rachel Risoleo 3G
Sun Feb 28, 2016 9:52 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Homework problem 15.63
Replies: 1
Views: 278

Homework problem 15.63

In the solutions manual for 15.63, there is a "-0.59" subtracted from the equation ln(k'/k)=Ea/R(1/T2-1/T1). Is this meant to be the value of lnA, and if so, how were we meant to find it? (it wasn't given in the equation). If not, does anyone know what this value represents? Thanks so much.
by Rachel Risoleo 3G
Sun Feb 21, 2016 11:58 pm
Forum: *Electrophiles
Topic: Reaction steps
Replies: 2
Views: 406

Reaction steps

How do you determine which step of an organic reaction will occur first? i.e. nucleophile or electrophile? Or how do you know if these steps occur simultaneously?
by Rachel Risoleo 3G
Mon Feb 15, 2016 11:25 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1119174

Re: Chemistry Jokes

No one has posted on this feed in a while because all the good Chem jokes Argon ;)
by Rachel Risoleo 3G
Sun Feb 07, 2016 3:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm material
Replies: 1
Views: 361

Midterm material

Will first order and second order rate laws be on the midterm? (as they have been in previous years)
Thanks!
by Rachel Risoleo 3G
Sun Jan 31, 2016 10:44 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Anodes and Cathodes
Replies: 1
Views: 232

Re: Anodes and Cathodes

I don't know that it's all that important, but I do think it was mentioned in lecture that the anode is drawn on the left. To be safe, I would draw the anode on the left, the cathode on the right.
by Rachel Risoleo 3G
Sun Jan 24, 2016 9:39 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1119174

Re: Chemistry Jokes

Why did the acid go to the gym?
-To become a buffer solution!

Why did the big white bear dissolve in water?
-Because he was polar.

What do dipoles say in passing?
-Have you got a moment?

(no original content)
by Rachel Risoleo 3G
Sun Jan 17, 2016 9:37 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Irreversible and Reversible Processes
Replies: 2
Views: 489

Re: Irreversible and Reversible Processes

Also, because a reversible process has minute changes to properties (i.e. volume, pressure), irreversible processes generally have larger and faster changes to these properties (for example, a gas might expand quickly, in one large increment, rather than slowly in many small ones).
by Rachel Risoleo 3G
Sun Jan 17, 2016 9:31 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Constant Temperature in Ideal Gas Expansion
Replies: 2
Views: 464

Re: Constant Temperature in Ideal Gas Expansion

I believe the heat does come in for the purpose of maintaining a constant temperature, and so that the change in energy (and the change in temperature) is zero.
by Rachel Risoleo 3G
Sun Jan 10, 2016 10:23 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calorimeter Process
Replies: 1
Views: 298

Re: Calorimeter Process

A calorimeter measures the heat created by a sample that is burned (combusted) in a closed vessel. The sample is burned in an oxygen atmosphere, surrounded by water, and under constant conditions. The heat created by the combustion is transferred to the surrounding water, and that is how the heat is...
by Rachel Risoleo 3G
Mon Nov 23, 2015 6:59 pm
Forum: Biological Examples
Topic: Video: Hemoglobin and Myoglobin in the Body
Replies: 1
Views: 481

Re: Video: Hemoglobin and Myoglobin in the Body

Video explaining the biological function of coordination compounds hemoglobin and myoglobin
by Rachel Risoleo 3G
Sun Nov 22, 2015 11:48 pm
Forum: Ideal Gases
Topic: When is K small enough to make the assumption
Replies: 2
Views: 511

Re: When is K small enough to make the assumption

I agree with the above. In lecture the other day, Dr. Lavelle said that it is usually okay to make the assumption if K<10^-5, however I would still always check at the end of the calculation to ensure that it did not specifically impact your value!
by Rachel Risoleo 3G
Sun Nov 22, 2015 11:44 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Bidentate or Polydentate
Replies: 2
Views: 466

Re: Bidentate or Polydentate

Also, due to the shape of the oxalato complex, only two of the oxygen atoms will be able to bond, because they are opposite each other. It has less to do with the double or single nature of the bond because, as we know due to resonance structures, in nature all bonds will tend to be the same, with a...
by Rachel Risoleo 3G
Sun Nov 15, 2015 11:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: relationship between Kp and Kc
Replies: 2
Views: 562

relationship between Kp and Kc

Hi! Could someone please specify what exactly the relationship between Kp and Kc is and how to derive it? Thank you!
by Rachel Risoleo 3G
Sun Oct 11, 2015 10:34 pm
Forum: Properties of Light
Topic: Balmer vs Lyman Series
Replies: 3
Views: 1014

Re: Balmer vs Lyman Series

For the Balmer series, nf=2; for the Lyman series, nf=1
by Rachel Risoleo 3G
Sun Oct 11, 2015 10:32 pm
Forum: Properties of Light
Topic: Photon Emission
Replies: 2
Views: 548

Re: Photon Emission

Hi! The equation E=hc/lamda gives the "energy per photon." So in problem 1.27 for example, you can find the E/photon using hc/lamda, and then use dimensional analysis to find the number of photons (you can convert the Watts to Joules by multiplying W by the number of seconds, because W=J/s...
by Rachel Risoleo 3G
Sun Oct 04, 2015 10:43 pm
Forum: General Science Questions
Topic: Ions
Replies: 1
Views: 590

Re: Ions

Anions are ions with a negative charge (they have gained electrons), whereas "Cat"ions are ions with a positive charge (they're "paws"itive :) )

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