Search found 18 matches

by Isha Bagga 3J
Sun Mar 15, 2015 1:30 am
Forum: Balancing Redox Reactions
Topic: Electrons involved in a reaction
Replies: 3
Views: 708

Re: Electrons involved in a reaction

I thought the oxidation state for carbon in CH4 was +4 but then H is also +1, so I was kind of confused on that.
by Isha Bagga 3J
Sun Mar 15, 2015 12:16 am
Forum: Balancing Redox Reactions
Topic: Electrons involved in a reaction
Replies: 3
Views: 708

Electrons involved in a reaction

In the reaction H2CO3 --> H20 + CO2, how do we tell how many electrons are involved in the reaction? Also, is it a redox reaction?
I have the same question for the reaction CH4 + 2 O2 --> CO2 + 2 H2O. Thanks!
by Isha Bagga 3J
Sat Mar 14, 2015 11:31 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Change in Entropy: Bug's Finals
Replies: 3
Views: 1051

Change in Entropy: Bug's Finals

This is from Bug's practice final, question 3. We are given a piece of solid at 200 degrees C in a liquid at 20 degrees C. Moles of solid is 0.1 and moles of liquid is 1. The Cp of solid is .1 J/mol K and Cp of liquid is 30 J/mol K. The question asks to find delta S of the system. Can anyone help wi...
by Isha Bagga 3J
Fri Mar 13, 2015 6:51 pm
Forum: Calculating Work of Expansion
Topic: Bug's Practice Final #4 work done by system
Replies: 1
Views: 300

Bug's Practice Final #4 work done by system

For Bug's practice final that he posted here: https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=160&t=5352"onclick="window.open(this.href);return false; (it's under the Review Session Information and Final Exam Rooms post) I'm not sure how to do #4 regarding work of the system because we were ...
by Isha Bagga 3J
Sun Mar 08, 2015 10:48 pm
Forum: *Cycloalkenes
Topic: Naming cycloalkenes #1.21
Replies: 2
Views: 626

Naming cycloalkenes #1.21

For #21 in chapter 1, why is part a) 5-Methylcyclopenta-1,3-diene? If you start numbering at the bottom left carbon, couldn't it be named 3-Methylcyclopenta-1,4-diene, which would result in smaller values? I don't think I understand the priority in this case.
by Isha Bagga 3J
Thu Mar 05, 2015 10:06 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Torsional and steric strain #3.9
Replies: 6
Views: 1130

Torsional and steric strain #3.9

For question 9 in chapter 3 of the organic chemistry workbook, how do you know that there is torsional and steric strain? For the torsional strain, are the two CH2 parts eclipsed?
by Isha Bagga 3J
Thu Mar 05, 2015 8:21 pm
Forum: *Ketones
Topic: Ketone structure #2.46
Replies: 2
Views: 1855

Ketone structure #2.46

For number 46 in chapter 2, it asks to name all the functional groups in the aspartame molecule. I thought there were some ketones in there, with the double bonded oxygen, but I think I might be confused on what a ketone functional group is because the answer didn't have ketone. If anyone could expl...
by Isha Bagga 3J
Thu Mar 05, 2015 12:36 am
Forum: *Alkenes
Topic: Cis and trans naming #1.26
Replies: 2
Views: 582

Cis and trans naming #1.26

Can someone help me with #26 in chapter 1 of the organic chemistry workbook? How do you know that it is trans-4-bromo-3-methyl-3-heptene? I thought it was supposed to be cis- because the bromine and the fluorine were on the same side.
by Isha Bagga 3J
Tue Feb 17, 2015 11:59 pm
Forum: General Rate Laws
Topic: Bimolecular rate law, 14.47b and 14.49
Replies: 3
Views: 798

Bimolecular rate law, 14.47b and 14.49

For 14.47b, I thought that the answer was supposed to be rate =k*[NO2]^2*[O] for step 2, but the answer showed rate =k*[NO2]*[O]. Also, for 14.49, I thought the answer would be rate =k*[NO]^2*[Br], but again it is just rate =k*[NO]*[Br]. Can anybody explain why this is? Thank you!
by Isha Bagga 3J
Sat Dec 13, 2014 6:01 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination numbers for ligands
Replies: 1
Views: 372

Coordination numbers for ligands

What are the coordination numbers for SCN-, NO2-, and CN- and which atom in each ligand is the bonding atom?
by Isha Bagga 3J
Sat Dec 13, 2014 1:22 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: percentage deprotonation HW 11.65
Replies: 2
Views: 489

percentage deprotonation HW 11.65

Can somebody help me with question 65 in chapter 11? I was confused on how to do percent deprotonation backwards in this question. Thanks!
by Isha Bagga 3J
Fri Dec 12, 2014 11:41 am
Forum: *Titrations & Titration Calculations
Topic: pH at half-equivalence point
Replies: 2
Views: 8978

pH at half-equivalence point

I know for weak acid/strong base and strong acid/weak base titrations, at the 1/2 equivalence point, pH=pKa. But when trying to find the pH at this point for strong acid/strong base titrations, there is no pKa, so how would you approach this problem? If you know the volume at this point, how would y...
by Isha Bagga 3J
Thu Dec 11, 2014 9:49 pm
Forum: Hybridization
Topic: Assigning hybridization with e- density
Replies: 2
Views: 399

Assigning hybridization with e- density

I attached a chart showing what hybridization an atom would be in regards to the regions of electron density that it has. Lone pairs are included as a region of electron density.
by Isha Bagga 3J
Thu Dec 11, 2014 9:13 pm
Forum: *Titrations & Titration Calculations
Topic: Titration Problem - Strong Acid Strong Base 12.29
Replies: 2
Views: 419

Re: Titration Problem - Strong Acid Strong Base 12.29

I made a video explaining parts a and b of this question: https://www.youtube.com/watch?v=fc1nx3F ... e=youtu.be

Hope that helps!
by Isha Bagga 3J
Sun Nov 09, 2014 5:13 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Hund's Rule for Z<8 molecular orbital energy diagram
Replies: 1
Views: 556

Re: Hund's Rule for Z<8 molecular orbital energy diagram

The pi 2px and pi 2py get filled up first because of their lower energies in this diagram. Then the last 2 electrons go in sigma 2pz to have a complete molecule with 14 electrons.
by Isha Bagga 3J
Sun Nov 09, 2014 3:41 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: MO diagram for ions
Replies: 1
Views: 342

MO diagram for ions

When drawing an MO diagram for an ion, say O2+ for example, where do you remove the electron from the oxygen atoms? Do you remove it from the right p orbital for oxygen or the left p orbital? Or, do you just remove it from the center part of the diagram where the oxygens are bonded?
by Isha Bagga 3J
Sun Nov 02, 2014 10:45 am
Forum: Determining Molecular Shape (VSEPR)
Topic: #3.13 Lewis Structure
Replies: 1
Views: 402

#3.13 Lewis Structure

For part c, the molecule is COF2, and we have to draw the Lewis structure. In the solutions manual, it had the double bond on the CO bond and I was wondering how do you know it goes there rather than on one of the CF bonds? Or does this molecule have resonance structures?
by Isha Bagga 3J
Tue Oct 21, 2014 11:44 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 1
Views: 423

Work Function

When talking about work function, is the value given the joules per mole of the metal or per atom? And in either case, which value should be substituted when using the formula ?

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