Search found 25 matches

by Myra_Zhan_2N
Wed Mar 15, 2017 8:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Common names on final
Replies: 3
Views: 375

Re: Common names on final

My TA said it will most likely be IUPAC naming in general, but if they want common name, the question will specifically ask for IUPAC and common names.
by Myra_Zhan_2N
Wed Mar 08, 2017 10:54 am
Forum: *Alkanes
Topic: Prefixes
Replies: 1
Views: 197

Prefixes

Just to clarify, tert- and sec- do not count in alphabetical order when naming, but iso- and neo- do right?
by Myra_Zhan_2N
Wed Mar 01, 2017 12:31 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell potential
Replies: 4
Views: 552

Re: Cell potential

When you utilize E(cathode)-E(anode), take note that both are given as a reduction reaction value so be sure to check the negatives and positives.
by Myra_Zhan_2N
Wed Feb 22, 2017 11:34 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Pre-Equilibrium
Replies: 2
Views: 385

Re: Pre-Equilibrium

You know you would have to use the pre-equilibrium approach when Step 1 is fast and Step 2 is slow. This is because the intermediate will be included in the rate law equation. That is not allowed so you would need to use substitution to replace the intermediate concentration.
by Myra_Zhan_2N
Mon Feb 13, 2017 1:11 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: E values
Replies: 1
Views: 266

Re: E values

The E value does not change when you multiply your half reactions. The only change an E value can have is a change in sign if the equation is flipped.
by Myra_Zhan_2N
Mon Feb 13, 2017 1:08 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: How to treat deltaE when flipping equations?
Replies: 3
Views: 403

Re: How to treat deltaE when flipping equations?

This is because delta E is an intensive property. Therefore, the constant is not multiplied by the delta E value, but the sign will change if the equation is flipped.
by Myra_Zhan_2N
Mon Feb 06, 2017 6:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Fall 2016 Chem 14A Final Exam
Replies: 1
Views: 261

Re: Fall 2016 Chem 14A Final Exam

You can pick it up in Young Hall on the third floor (enter at the entrance to the right of the pillars). You just need to show your BruinCard to the guy at the front desk.
by Myra_Zhan_2N
Mon Jan 30, 2017 11:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 13715

Re: Quiz 1 Preparation Answers

You would use ΔG^o=ΔH^o−TΔS^o after you find ΔH^o (rxn) and ΔS^o (rxn) values from the tables provided. Make sure your units match. You will need to convert ΔS^o to KJ for the final answer. That is the equation I am using. And I remembered to convert J to kJ. Still got the wrong answer. I also do n...
by Myra_Zhan_2N
Mon Jan 30, 2017 10:28 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 13715

Re: Quiz 1 Preparation Answers

Can someone verify that the equation needed to solve #12 is the one we learned for calculating standard free energy change? I am getting caught up in the wording: "Calculate the standard Gibbs free energy". Should I be using a different equation (even though we're given standard change in...
by Myra_Zhan_2N
Mon Jan 23, 2017 11:54 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: HW 8.53
Replies: 3
Views: 379

Re: HW 8.53

Another important thing to remember is that q will always equal 0 in an adiabatic process in a closed system. q cannot be negative or positive because no heat is added or removed.
by Myra_Zhan_2N
Thu Jan 19, 2017 12:14 am
Forum: Calculating Work of Expansion
Topic: Work Equation [ENDORSED]
Replies: 1
Views: 220

Work Equation [ENDORSED]

Does the negative sign in W=-P *ΔV represent the significance of energy used as a work of expansion?
by Myra_Zhan_2N
Tue Jan 10, 2017 4:05 pm
Forum: Administrative Questions and Class Announcements
Topic: No more quiz workbook?
Replies: 4
Views: 503

Re: No more quiz workbook?

According to the syllabus, there will just be practice quizzes in the course reader for our three quizzes.
by Myra_Zhan_2N
Mon Nov 28, 2016 8:52 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Sig Figs for Logarithms and Exponents
Replies: 2
Views: 400

Re: Sig Figs for Logarithms and Exponents

My TA mentioned that when finding pH, it's just a general rule to keep it at two decimal places. So we would round off to the hundredth place.
by Myra_Zhan_2N
Mon Nov 21, 2016 10:42 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Why when given Ka = weak acid
Replies: 7
Views: 810

Re: Why when given Ka = weak acid

If you're given Kb, it's the same case as Ka. There will only be an equilibrium constant if the base is not completely ionized in water. Therefore, Kb must be a weak base.
by Myra_Zhan_2N
Fri Nov 18, 2016 12:32 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Naming Question and Coord. # for Nitrito
Replies: 3
Views: 386

Re: Naming Question and Coord. # for Nitrito

I believe that is an error. Nitrito is an anionic monodentate ligand.
by Myra_Zhan_2N
Fri Nov 18, 2016 12:30 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Naming Ligands
Replies: 5
Views: 736

Re: Naming Ligands

A TA mentioned just to stick to the old names (bromo, iodo, etc.) when naming the anionic ligands. For the purpose of this class, it's not necessary to adapt to the new names.
by Myra_Zhan_2N
Mon Nov 14, 2016 10:08 am
Forum: Ideal Gases
Topic: Ideal Gas Law and Equilibrium Constant
Replies: 7
Views: 742

Re: Ideal Gas Law and Equilibrium Constant

We didn't really cover it in lecture, but it is part of the section explaining the properties of gases which is something we should know for the quiz.
by Myra_Zhan_2N
Mon Nov 07, 2016 11:27 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Shapes
Replies: 6
Views: 555

Re: Shapes

Yes, the number of bonded atoms and number of unpaired electrons relative to the central atom is what determines the shape and bond angles of the molecule.
by Myra_Zhan_2N
Mon Nov 07, 2016 11:19 am
Forum: Ionic & Covalent Bonds
Topic: ionic vs. covalent bonds
Replies: 2
Views: 381

Re: ionic vs. covalent bonds

Greater electronegativity differences will have greater ionic character. Smaller electronegativity differences will have greater covalent character. The values of 1.5 and 2 just give a range as to see whether a bond is covalent or ionic based on electronegativity differences.
by Myra_Zhan_2N
Mon Oct 24, 2016 10:53 am
Forum: Lewis Structures
Topic: Central Atom
Replies: 5
Views: 607

Re: Central Atom

The central atom is generally the least electronegative atom. The electronegativity increases across a period but decreases down a group.
by Myra_Zhan_2N
Mon Oct 17, 2016 9:00 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Chapter 2 HW: #37
Replies: 1
Views: 218

Re: Chapter 2 HW: #37

It is false because as the value of l increases, the electrons have a harder time penetrating to the nucleus.
by Myra_Zhan_2N
Mon Oct 10, 2016 8:20 pm
Forum: Properties of Light
Topic: Rydberg Equation
Replies: 5
Views: 615

Re: Rydberg Equation

Essentially, both can be used, but I personally prefer to use the latter one. When you have a question asking about the change from one energy level to another, I find it easier to plug the values in individually into the second equation. Afterwards, you can find the change in E by subtracting E (fi...
by Myra_Zhan_2N
Mon Oct 03, 2016 8:22 pm
Forum: SI Units, Unit Conversions
Topic: Conversions [ENDORSED]
Replies: 8
Views: 1005

Re: Conversions [ENDORSED]

Madeline Fox 1J wrote:What is the conversion from Kev to J?


1 eV= 1.602 * 10^-19 Joules
1000 eV= 1 KeV

Hope this helps~
by Myra_Zhan_2N
Wed Sep 28, 2016 12:37 am
Forum: Significant Figures
Topic: Sig Figs Throughout Problems
Replies: 12
Views: 2898

Re: Sig Figs Throughout Problems

My TA said to keep the numbers as you work through the problem and find the final answer according to sigfigs at the end. He also mentioned a way to keep track of the final number of sigfigs is to underline the supposed final number of sigfigs each time as you work through each step of the problem.
by Myra_Zhan_2N
Mon Sep 26, 2016 8:43 pm
Forum: Student Social/Study Group
Topic: Rieber Hall 14A Study Group (Fall 2016)
Replies: 49
Views: 4413

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

I'm definitely interested in joining. Maybe a weekend afternoon and a couple weekday evenings?

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