Search found 32 matches

by Chris_Rudewicz_3H
Sat Mar 18, 2017 10:28 pm
Forum: *Alcohols
Topic: Final 2015 - 9B
Replies: 2
Views: 632

Re: Final 2015 - 9B

The alcohol at the end of the propane is what is important here. So you will name it at the end.
by Chris_Rudewicz_3H
Sat Mar 18, 2017 9:37 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Number 5B from 2015 Final
Replies: 2
Views: 316

Number 5B from 2015 Final

"A standard electrochemical cell is made by placing a silver electrode into a 1.0 M Ag+ solution and a cadmium electrode into a 1.0 M Cd2+ solution. What is the redox reaction and what is the maximum potential, Ecell, produced by this cell?" How do I know which one is being oxidized and wh...
by Chris_Rudewicz_3H
Mon Mar 13, 2017 8:22 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 209
Views: 101171

Re: Saying Thank You to Dr. Lavelle

Dr. Lavelle, Thank you for being such an excellent instructor for Chem 14a as well as Chem 14b. Your hard work does not go unnoticed; the sheer amount of resources you give to your students is incredible. You truly want us all to succeed, and I will forever be grateful for having you as my first sci...
by Chris_Rudewicz_3H
Thu Mar 09, 2017 1:36 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 15896

Re: Quiz 3 Winter 2017

So if we have say, for example, a 35/40 on quiz 1, a 37/40 on quiz 2, and then we get a 10/40 on quiz 3, what will happen is we will get a 37/40 on quiz 3 in the gradebook?
by Chris_Rudewicz_3H
Thu Mar 09, 2017 1:25 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 15896

Re: Quiz 3 Winter 2017

We still get to drop our lowest quiz score, right?
by Chris_Rudewicz_3H
Tue Feb 14, 2017 9:30 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 2015 Midterm Q4&5 part D
Replies: 3
Views: 351

Re: 2015 Midterm Q4&5 part D

We have to do step 3 because it wants the entropy of vaporization of water at 298k, so we need to bring it back down to room temperature in order to do that because the first two steps just calculate it for boiling But wouldn't the vapor turn to water again at that point? Why don't we calculate the...
by Chris_Rudewicz_3H
Tue Feb 14, 2017 9:10 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 2015 Midterm Q4&5 part D
Replies: 3
Views: 351

2015 Midterm Q4&5 part D

Why do we do step 3? Why do we have to account for the entropy of the water vapor cooling from 373 K back down to 298 K? I understand why you do steps 1 and 2, but why step 3?
by Chris_Rudewicz_3H
Mon Feb 13, 2017 5:28 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Faraday Constant
Replies: 3
Views: 311

Re: Faraday Constant

If you look at page 50 in the course reader, there are 3 mols of electrons, but the Faraday Constant is still 96485 C/mol e-.
by Chris_Rudewicz_3H
Sun Feb 12, 2017 11:07 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: reaction order
Replies: 3
Views: 470

Re: reaction order

This video may also be helpful to you https://www.khanacademy.org/science/che ... tion-order
by Chris_Rudewicz_3H
Sun Feb 12, 2017 11:07 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: reaction order
Replies: 3
Views: 470

Re: reaction order

You can do various plots and if it is a straight line, you can determine what order the rxn is. For example, for zero-order reactions, if you plot [A] vs. time, it should be a straight negative line.
by Chris_Rudewicz_3H
Fri Feb 10, 2017 12:44 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019940

Re: Post All Chemistry Jokes Here

What is H204?

Drinking, cleaning your dishes, taking a shower, etc.
by Chris_Rudewicz_3H
Mon Jan 30, 2017 5:05 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: HW 8.49
Replies: 1
Views: 216

HW 8.49

How do you find the temperature of the system? I understand everything else.
by Chris_Rudewicz_3H
Sat Jan 28, 2017 4:35 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Change in entropy= q/T [ENDORSED]
Replies: 3
Views: 386

Re: Change in entropy= q/T [ENDORSED]

As T gets larger, the 'change in entropy' will become smaller. As you divide by a bigger number, the answer becomes smaller.
by Chris_Rudewicz_3H
Mon Jan 16, 2017 2:40 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019940

Re: Post All Chemistry Jokes Here

Did you know that you can cool yourself to -273.15˚C and still be 0k?
by Chris_Rudewicz_3H
Thu Jan 12, 2017 3:56 pm
Forum: Phase Changes & Related Calculations
Topic: Sublimiation
Replies: 6
Views: 595

Re: Sublimiation

No, that would be like saying when water turns into ice it's called melting. I believe it is called deposition.
by Chris_Rudewicz_3H
Mon Nov 28, 2016 4:35 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019940

Re: Post All Chemistry Jokes Here

My teacher threw some sodium chloride at me.

That's a salt!
by Chris_Rudewicz_3H
Mon Nov 21, 2016 1:37 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pressure/Expansion effect on products and reactants
Replies: 2
Views: 325

Re: Pressure/Expansion effect on products and reactants

An increase in expansion is increasing the volume, so the reverse action will occur (concentration moves from lower moles equation -> higher moles side of equation)
by Chris_Rudewicz_3H
Fri Nov 18, 2016 1:24 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number [ENDORSED]
Replies: 3
Views: 474

Re: coordination number [ENDORSED]

Bonds with the central transition metal
by Chris_Rudewicz_3H
Mon Nov 14, 2016 8:20 pm
Forum: Ideal Gases
Topic: ΔH?
Replies: 2
Views: 391

Re: ΔH?

Positive value means endothermic. Negative value means exothermic.
by Chris_Rudewicz_3H
Mon Nov 14, 2016 2:09 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand Names
Replies: 3
Views: 332

Re: Ligand Names

I doubt Dr. Lavelle would do something like that.
by Chris_Rudewicz_3H
Mon Oct 24, 2016 10:56 pm
Forum: Ionic & Covalent Bonds
Topic: Chemical Formulas
Replies: 1
Views: 251

Re: Chemical Formulas

I read a post by Dr. Lavelle earlier but I can't find it right now.

It said that formulas for uncommon molecules will be given.
by Chris_Rudewicz_3H
Mon Oct 24, 2016 10:51 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: e- configuration regarding 3d and 4s orbitals
Replies: 2
Views: 259

Re: e- configuration regarding 3d and 4s orbitals

3d.

for example here is Scandium's electron configuration:

[Ar] 3d1 4s2 .
by Chris_Rudewicz_3H
Mon Oct 24, 2016 10:50 pm
Forum: Trends in The Periodic Table
Topic: Periods 15 and 14 relationship
Replies: 2
Views: 374

Re: Periods 15 and 14 relationship

I think you meant Groups 15 and 14.
From what I have seen online, there is no real pattern or trend for groups 15 and 14. One thing for sure though is that Nitrogen has a very low electron affinity value.
by Chris_Rudewicz_3H
Mon Oct 24, 2016 10:47 pm
Forum: Ionic & Covalent Bonds
Topic: Formal Charge
Replies: 1
Views: 220

Re: Formal Charge

Ionic bonds are usually not written with dashes to show bonds like how covalent bonds are represented. The ions should have their own respective charges in the corner in the case of ionic bonds.
by Chris_Rudewicz_3H
Mon Oct 24, 2016 10:45 pm
Forum: Lewis Structures
Topic: Lewis Structures with the noble gases
Replies: 1
Views: 456

Re: Lewis Structures with the noble gases

Any element before phosphorus cannot expand past an octet. This means elements beyond it (including phosphorus) are able to break this ' octet rule' .
by Chris_Rudewicz_3H
Mon Oct 24, 2016 10:43 pm
Forum: Resonance Structures
Topic: Resonance vs. Lewis Structure?
Replies: 9
Views: 976

Re: Resonance vs. Lewis Structure?

It should ask for resonance structures in the question if that is what they are looking for. If it just asks to draw THE lewis structure, like in question 101a in chapter 3, there is only one correct structure.
by Chris_Rudewicz_3H
Mon Oct 24, 2016 2:21 pm
Forum: Ionic & Covalent Bonds
Topic: Stronger bonds
Replies: 3
Views: 368

Re: Stronger bonds

The bond length and the type of bond tell you a lot about the strength of the bond.

Ionic > covalent in terms of strength in most cases.

triple bond > double bond > single bonds in most cases. Triple bonds are shortest, single are longest.
by Chris_Rudewicz_3H
Mon Oct 17, 2016 12:36 am
Forum: Ionic & Covalent Bonds
Topic: Metallic bonds, Lewis Structures
Replies: 2
Views: 343

Re: Metallic bonds, Lewis Structures

I'm not sure about the first question, but to answer your second question, the order doesn't matter. Just as long as you write your structure accurately and have the correct amount of electrons in it, you should be fine.
by Chris_Rudewicz_3H
Mon Oct 10, 2016 5:22 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: HW 1.15
Replies: 3
Views: 343

Re: HW 1.15

How would we solve this problem using the formula we used in class En=-(hR/n^2)? He never went over this formula in class so won't you get the same answer using the other formula as well? The formula in the reply above is the same as the formula we used in class (En = -(hR/n^2)). But the question i...
by Chris_Rudewicz_3H
Thu Oct 06, 2016 9:56 pm
Forum: Empirical & Molecular Formulas
Topic: Nomenclature?
Replies: 1
Views: 296

Nomenclature?

Will we have to know nomenclature (names of chemicals and formulas for chemicals) for the quizzes/midterms/finals? If so, which ones should we study? As many as we can? Thanks for the help.
by Chris_Rudewicz_3H
Tue Sep 27, 2016 11:07 am
Forum: Student Social/Study Group
Topic: Rieber Hall 14A Study Group (Fall 2016)
Replies: 49
Views: 4436

Re: Rieber Hall 14A Study Group (Fall 2016)

Hi, I live on the fourth floor and I'd like to join! Keep me posted on meeting times and if you guys decide to make a group me!

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