Search found 25 matches
- Wed Mar 15, 2017 8:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Common names on final
- Replies: 3
- Views: 764
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.
Prefixes
Just to clarify, tert- and sec- do not count in alphabetical order when naming, but iso- and neo- do right?
- Wed Mar 01, 2017 12:31 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell potential
- Replies: 4
- Views: 1035
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.
- Wed Feb 22, 2017 11:34 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Pre-Equilibrium
- Replies: 2
- Views: 618
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.
- 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: 467
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.
- 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: 1207
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.
- Mon Feb 06, 2017 6:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Fall 2016 Chem 14A Final Exam
- Replies: 1
- Views: 586
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.
- Mon Jan 30, 2017 11:06 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 1 Preparation Answers
- Replies: 130
- Views: 25712
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...
- Mon Jan 30, 2017 10:28 am
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 1 Preparation Answers
- Replies: 130
- Views: 25712
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...
- Mon Jan 23, 2017 11:54 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: HW 8.53
- Replies: 3
- Views: 805
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.
- Thu Jan 19, 2017 12:14 am
- Forum: Calculating Work of Expansion
- Topic: Work Equation [ENDORSED]
- Replies: 1
- Views: 481
Work Equation [ENDORSED]
Does the negative sign in W=-P *ΔV represent the significance of energy used as a work of expansion?
- Tue Jan 10, 2017 4:05 pm
- Forum: Administrative Questions and Class Announcements
- Topic: No more quiz workbook?
- Replies: 4
- Views: 990
Re: No more quiz workbook?
According to the syllabus, there will just be practice quizzes in the course reader for our three quizzes.
- 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: 982
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.
- 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: 3891
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.
- Fri Nov 18, 2016 12:32 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Naming Question and Coord. # for Nitrito
- Replies: 3
- Views: 866
Re: Naming Question and Coord. # for Nitrito
I believe that is an error. Nitrito is an anionic monodentate ligand.
- Fri Nov 18, 2016 12:30 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Naming Ligands
- Replies: 5
- Views: 1297
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.
- Mon Nov 14, 2016 10:08 am
- Forum: Ideal Gases
- Topic: Ideal Gas Law and Equilibrium Constant
- Replies: 7
- Views: 1602
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.
- Mon Nov 07, 2016 11:27 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shapes
- Replies: 6
- Views: 1147
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.
- Mon Nov 07, 2016 11:19 am
- Forum: Ionic & Covalent Bonds
- Topic: ionic vs. covalent bonds
- Replies: 2
- Views: 690
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.
- Mon Oct 24, 2016 10:53 am
- Forum: Lewis Structures
- Topic: Central Atom
- Replies: 5
- Views: 1226
Re: Central Atom
The central atom is generally the least electronegative atom. The electronegativity increases across a period but decreases down a group.
- Mon Oct 17, 2016 9:00 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Chapter 2 HW: #37
- Replies: 1
- Views: 407
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.
- Mon Oct 10, 2016 8:20 pm
- Forum: Properties of Light
- Topic: Rydberg Equation
- Replies: 5
- Views: 1316
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...
- Mon Oct 03, 2016 8:22 pm
- Forum: SI Units, Unit Conversions
- Topic: Conversions [ENDORSED]
- Replies: 8
- Views: 1746
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~
- Wed Sep 28, 2016 12:37 am
- Forum: Significant Figures
- Topic: Sig Figs Throughout Problems
- Replies: 12
- Views: 7146
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.
- Mon Sep 26, 2016 8:43 pm
- Forum: Student Social/Study Group
- Topic: Rieber Hall 14A Study Group (Fall 2016)
- Replies: 49
- Views: 10154
Re: Rieber Hall 14A Study Group (Fall 2016)
I'm definitely interested in joining. Maybe a weekend afternoon and a couple weekday evenings?