CHEMISTRY COMMUNITY

Amy_Shao_2D

You want the set of numbers that has the lowest number. 1 is the lowest number, so use the set that has 1, which is 1,6. Side note: you'd think it was 2,3 because that has lower numbers overall but IUPAC doesn't have a "lowest sum" rule or anything (ie 2+3 is less than 1+6), just lowest n...

Amy_Shao_2D

If you're talking about graphing deltaG reaction and deltaG transition, deltaG reaction is the distance between products and reactants and deltaG transition is the distance from the reactant to the top of the transition state

Amy_Shao_2D

You want the set of numbers that has the lowest number. 1 is the lowest number, so use the set that has 1, which is 1,6. Side note: you'd think it was 2,3 because that has lower numbers overall but IUPAC doesn't have a "lowest sum" rule or anything (ie 2+3 is less than 1+6), just lowest nu...

Amy_Shao_2D

I don't think we've gone over those things in class besides alkenes and alkynes so I'd say we don't need to know them at this point

Amy_Shao_2D

They might show up on the final so I'd still do them even if they don't show up on quiz 2.

Amy_Shao_2D

Also the reason why we only look at residual entropy at 0K is because at 0K there is no vibrational entropy. I think the increasing molar mass has to do with generally, more molar mass means more complexity which means more interactions between the atoms which leads to vibrations but at 0K it just d...

Amy_Shao_2D

Yes, you usually save doing sig figs till the very end. Sometimes solutions will round ahead of time because they probably don't want to have to write out the entire number, but your end answer should be the same.

Amy_Shao_2D

One step in the production of hydrogen as a fuel is the reaction of methane with water vapor: CH4(g)+H2O(g)->CO2(g)+3H2(g) deltaH=-318kJ What is the change in internal energy for the production of 1.00 mol H2? In the solution manual it says there's a net production of 2/3 mole of gas. Where does the...

Amy_Shao_2D

Calculate the standard enthalpy of formation of dinitrogen pentoxide from the following data 2NO(g)+O2(g)->2NO2(g) H=-114.1 kJ 4NO2(g)+O2(g)->2N2O5 H=-110.2kJ and from the standard enthalpy of formation of nitric oxide, NO (see Appendix 2A) I'm confused how to know what is needed in the final reacti...

Amy_Shao_2D

.0821 has units L*atm/(K*mol) ad 8.314 has units J/(K*mol) so depending on what the problem is asking and what units are used in the problem, you can determine which R to use

Amy_Shao_2D

Will we be receiving our finals back? If so, when and how?

Amy_Shao_2D

I think the 1.5x10^-3 is from 2.5x10^-3 mol CH3COOH reacting with 1.0x10^-3 mol OH-, so you subtract 1.0x10^-3 from 2.5x10^-3

But then I don't get how 1.0x10^-3 mol OH- is changed to 1.0x10^-3 mol CH3CO2...

Amy_Shao_2D

The reaction 2 HCl(g)-> H2(g)+Cl2(g) has K=3.2x10^-34 at 298K. The initial partial pressures are H2, 1.0 bar; HCl, 2.0 bar; and Cl2, 3.0 bar. At equilibrium there is 1.0 mol H2(g). What is the volume of the container? (Don't be surprised at the large size of the volume)

Amy_Shao_2D

Draw the Lewis structure for XeO2F2. Explain why this structure would be allowed for Xe as a central atom but not for Ne as a central atom.

I don't really understand how to answer part 2 of the question. Is it because Ne is too small or something?

Amy_Shao_2D

To answer your first question, yes pi bonds will always be in the p orbitals.

Amy_Shao_2D

I have the same question; it makes sense for Cu2+ but then for Cu2- you're adding two electrons, so would it go into the p orbital and be 3d10 4s2 4p1? Or is it even possible to have Cu2-?

Amy_Shao_2D

Based on the Quiz 2 preparation quiz in the workbook, you don't need to know the polyatomic ions or they're given to you. Though I'd say it's good to know some of the frequently used polyatomic ions like sulfate, just in case.

Amy_Shao_2D

Also, I remember in class Dr. Lavelle said hydrogen is never in the center.

Amy_Shao_2D

I put n=4 into n-initial and solved for n-final which allowed me to get n=6. I'm wondering why this worked because the problem asked for the quantum level where the electron began. You got the same answer cause you did +deltaE=initial-final, and the actual way is -deltaE=final-initial. Delta E is n...

Amy_Shao_2D

Delta v would be 2 times .1 which is .2, since .1 is the uncertainty in the velocity and the value of v can range from 2.25 to 2.45. You can also think of delta v as 2.45-2.25, which is .2. Hope this helps!

Amy_Shao_2D

Going off of this, he also mentioned threshold value a few times. Is that the value that the wavelength has to be shortened to in order for increasing intensity to actually remove electrons?

CHEMISTRY COMMUNITY

Search found 21 matches

Re: Order of naming

Re: Quiz 2 question

Re: Order of naming

Re: 4.11, 4.13

Re: Quiz prep 2 #11

Re: standard molar entropy

Re: Question 7.27, Gas constant temperature units

8.117

Homework 8.65

Re: 2 different R constants?

Re: Chem Final [ENDORSED]

Re: Chapter 13 #35

11.67

Chapter 2 Quiz #7: Expanded Octets

Re: Pi Bonds

Re: Adding electrons for exceptions

Re: Naming for Quiz 2

Re: Ionization Energy

Re: Fall 2014 Quiz Prep

Re: Quiz Preparation #5 [ENDORSED]

Re: Increasing Intensity in Photoelectric Effect [ENDORSED]