Search found 17 matches

by keyanabogan 2J
Tue Mar 07, 2017 2:11 pm
Forum: *Alkanes
Topic: Section 1.1 pg 7
Replies: 1
Views: 345

Section 1.1 pg 7

In this section, an example is given where it asks to name the molecule structure given. But, in the given the molecule structure it states that there are 5 carbon atoms and 3 methyl substituents. I'm just confused on how you would determine which ones would be considered the 3 methyl, and which one...
by keyanabogan 2J
Mon Mar 06, 2017 9:00 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Section 4.2 Organic Chemistry Textbook
Replies: 1
Views: 366

Section 4.2 Organic Chemistry Textbook

In section 4.2, the example given shows in step 1 that the propene results in propan-2-ylium as reactants and it has the hyrdrogen atom attached to the CH2 molecule. Does the H have to be attached to the CH2 on the outside or can it just be attached to the CH in the chemical reaction?
by keyanabogan 2J
Mon Mar 06, 2017 4:50 pm
Forum: *Alkanes
Topic: Iso and Neo Prefixes
Replies: 5
Views: 792

Iso and Neo Prefixes

I don't understand what purpose iso- serves in naming molecules nor for neo-. I only understand that neo is used or molecules with more than 5 carbon atoms. Can someone explain what these prefixes are used for?
by keyanabogan 2J
Wed Feb 22, 2017 11:27 pm
Forum: General Rate Laws
Topic: Overall Order of a Reaction
Replies: 2
Views: 413

Overall Order of a Reaction

On page 621, it shows that the reaction of 2O3(g)->3O2(g) has a rate law of k([O3]^2/[O2]). I don't understand what happens to the coefficient of O2 in the rate law equation. Why doesn't O2 have a superscript of 3?
by keyanabogan 2J
Fri Feb 03, 2017 4:05 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Change in Concentration of Galvanic Cells
Replies: 1
Views: 288

Change in Concentration of Galvanic Cells

In the example we learned in class today regarding concentration cells, the concentration of the substance surrounding the cathode decreases in concentration because the moles of NO3- are moved to the anode side because of the gain in electrons in the cathode. And, in turn, the concentration of the ...
by keyanabogan 2J
Fri Jan 27, 2017 6:45 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: 9.43 on finding the final temperature when it is not given
Replies: 2
Views: 486

9.43 on finding the final temperature when it is not given

For problem 9.43 it is asking us to find the entropy and total entropy of the reaction. To do this we must use S=nC*ln(Tf/Ti). We first need to find the final temperature of the equation since it is not given. In the solutions manual it shows that to find the final temperature we use the equation: T...
by keyanabogan 2J
Fri Jan 20, 2017 8:11 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Degeneracy [ENDORSED]
Replies: 3
Views: 643

Degeneracy [ENDORSED]

In class, it was noted that w=0 for an O2 molecule. I didn't quite understand the reasoning behind this. And also is this true for all diatomic molecules?
by keyanabogan 2J
Fri Jan 13, 2017 10:06 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Expansion work done by/on the system - Problem 8.17
Replies: 1
Views: 291

Expansion work done by/on the system - Problem 8.17

I'm still having a little a trouble on determining whether expansion work is being done by the system or on the system. On problem 8.17 a) it shows that the system is a liquid and the surrounding is a solid, so does the phase state that the system and the surrounding is in act as an indicator on whe...
by keyanabogan 2J
Wed Nov 16, 2016 9:23 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Wrting the Chemical Formula for Coordination Compounds
Replies: 3
Views: 2246

Re: Wrting the Chemical Formula for Coordination Compounds

I also found that information on the internet about placing the anionic ligand before the neutral ligand in the chemical formula, but the some of the answers in the book, for example for 31d, had the neutral ligand go before the anionic ligand, so what is real?
by keyanabogan 2J
Wed Nov 09, 2016 3:01 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Heteronuclear Diatomic Molecules
Replies: 1
Views: 371

Heteronuclear Diatomic Molecules

I'm not quite sure how a heteronuclear diatomic molecule is drawn out on the correlation diagram.I understand that the total number of valence electrons is drawn out in the bonding and anti-bonding molecular orbital, but I'm not sure how the individual atoms are drawn out in the diagram. For example...
by keyanabogan 2J
Fri Nov 04, 2016 2:22 pm
Forum: Hybridization
Topic: Hybridizaton Textbook equation
Replies: 2
Views: 413

Hybridizaton Textbook equation

In the textbook when it begins to talk about hybridization it mentions a few equations. These equations include the s-orbitals and s-orbitals. For example, some of the equations were h1=s+px+py+pz and h2=s-px-py+pz. I don't understand specifically what these equations show us about hybrid orbital or...
by keyanabogan 2J
Wed Oct 26, 2016 8:07 pm
Forum: Octet Exceptions
Topic: Half Full d^5 and Full d^10 Subshells
Replies: 4
Views: 816

Half Full d^5 and Full d^10 Subshells

I understand that elements with a half full or full subshell are more stable, but I don't understand when you're allowed to do this. Is it just with elements with a subshell of 3d^4 4s^2, or 3d^9 4s^2, that are able to take an electron from the s-orbital and put it in the d-orbital?
by keyanabogan 2J
Mon Oct 17, 2016 6:25 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Valence Shell Energy Levels and Orbitals
Replies: 1
Views: 416

Valence Shell Energy Levels and Orbitals

In our Monday lecture we went over valence shells and their octet guidelines. I understand that depending on how many electrons are present in a bond that you add a certain number of orbital. For example, for 8 electrons it would be s^2p^6. What I didn't understand is when it was mentioned that the ...
by keyanabogan 2J
Fri Oct 14, 2016 2:41 pm
Forum: Trends in The Periodic Table
Topic: Ch 2. #67,81. 47,39,29
Replies: 1
Views: 291

Re: Ch 2. #67,81. 47,39,29

So #67 is asking which electron out of the two has a greater electron affinity. You just need to know that electron affinity increases up and to the right of the periodic table. One way ton look at it is by comparing it to electrostatic attraction. Electrostatic attraction has the same pattern on th...
by keyanabogan 2J
Mon Oct 03, 2016 10:00 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Video Module #18
Replies: 1
Views: 303

Atomic Spectra Video Module #18

The question says to find the energy per photon emitted with the given information of a 60W light bulb emitting 11 J of energy with a wavelength of 1850 nm in 1 sec. I know that watts have the units of J/s but I'm having trouble figuring out how to apply this information to the problem to help me so...
by keyanabogan 2J
Thu Sep 29, 2016 3:51 pm
Forum: Einstein Equation
Topic: Help with Question 59 in Chapter 1
Replies: 2
Views: 521

Re: Help with Question 59 in Chapter 1

To find the energy with the information already given you need to manipulate the known formulas. So from E=hv you use c=(lambda)v to change the v in E=hv to c/lambda. so now you have E=hc/lambda. inverse lambda is the same as 1/lambda which is why it is under the hc. lambda is also the symbol used f...

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