CHEMISTRY COMMUNITY

Chris_Rudewicz_3H

The alcohol at the end of the propane is what is important here. So you will name it at the end.

Chris_Rudewicz_3H

"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...

Chris_Rudewicz_3H

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...

Chris_Rudewicz_3H

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?

Chris_Rudewicz_3H

We still get to drop our lowest quiz score, right?

Chris_Rudewicz_3H

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...

Chris_Rudewicz_3H

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?

Chris_Rudewicz_3H

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-.

Chris_Rudewicz_3H

I believe it is always the same constant.

Chris_Rudewicz_3H

This video may also be helpful to you https://www.khanacademy.org/science/che ... tion-order

Chris_Rudewicz_3H

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.

Chris_Rudewicz_3H

What is H204?

Drinking, cleaning your dishes, taking a shower, etc.

Chris_Rudewicz_3H

How do you find the temperature of the system? I understand everything else.

Chris_Rudewicz_3H

As T gets larger, the 'change in entropy' will become smaller. As you divide by a bigger number, the answer becomes smaller.

Chris_Rudewicz_3H

Did you know that you can cool yourself to -273.15˚C and still be 0k?

Chris_Rudewicz_3H

No, that would be like saying when water turns into ice it's called melting. I believe it is called deposition.

Chris_Rudewicz_3H

My teacher threw some sodium chloride at me.

That's a salt!

Chris_Rudewicz_3H

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)

Chris_Rudewicz_3H

Bonds with the central transition metal

Chris_Rudewicz_3H

Positive value means endothermic. Negative value means exothermic.

Chris_Rudewicz_3H

I doubt Dr. Lavelle would do something like that.

Chris_Rudewicz_3H

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.

Chris_Rudewicz_3H

3d.

for example here is Scandium's electron configuration:

[Ar] 3d1 4s2 .

Chris_Rudewicz_3H

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.

Chris_Rudewicz_3H

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.

Chris_Rudewicz_3H

Any element before phosphorus cannot expand past an octet. This means elements beyond it (including phosphorus) are able to break this ' octet rule' .

Chris_Rudewicz_3H

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.

Chris_Rudewicz_3H

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.

Chris_Rudewicz_3H

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.

Chris_Rudewicz_3H

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...

Chris_Rudewicz_3H

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.

Chris_Rudewicz_3H

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!

CHEMISTRY COMMUNITY

Search found 32 matches

Re: Final 2015 - 9B

Number 5B from 2015 Final

Re: Saying Thank You to Dr. Lavelle

Re: Quiz 3 Winter 2017

Re: Quiz 3 Winter 2017

Re: 2015 Midterm Q4&5 part D

2015 Midterm Q4&5 part D

Re: Faraday Constant

Re: Faraday Constant

Re: reaction order

Re: reaction order

Re: Post All Chemistry Jokes Here

HW 8.49

Re: Change in entropy= q/T [ENDORSED]

Re: Post All Chemistry Jokes Here

Re: Sublimiation

Re: Post All Chemistry Jokes Here

Re: Pressure/Expansion effect on products and reactants

Re: coordination number [ENDORSED]

Re: ΔH?

Re: Ligand Names

Re: Chemical Formulas

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

Re: Periods 15 and 14 relationship

Re: Formal Charge

Re: Lewis Structures with the noble gases

Re: Resonance vs. Lewis Structure?

Re: Stronger bonds

Re: Metallic bonds, Lewis Structures

Re: HW 1.15

Nomenclature?

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