Search found 21 matches

by Jennifer_Lam_1A
Mon Mar 13, 2017 7:00 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Equatorial and Axial
Replies: 1
Views: 238

Equatorial and Axial

What is the difference between equatorial and axial?
by Jennifer_Lam_1A
Thu Mar 02, 2017 9:15 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Substituent Naming
Replies: 3
Views: 473

Substituent Naming

How do you know what number to put before the substituent? I understand it is how many carbon molecules there are before the substituent is attached, but I recall that in class, Professor Lavelle mentioned that it can be read left to right or right to left. How does this work?
by Jennifer_Lam_1A
Tue Feb 21, 2017 5:36 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 17377

Re: Quiz 2 Winter 2017

Can someone please explain #5 on the practice quiz? I thought the answer would be A because you have to take into account temperature when finding the activation energy.
by Jennifer_Lam_1A
Sun Feb 12, 2017 2:43 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Order of Reactant
Replies: 1
Views: 238

Order of Reactant

I was wondering what "order of the reactant" actually means. When given a problem, when the problem tell us what order it is or would we have to figure that out. If we have to find it out on our own, how would we do so?
by Jennifer_Lam_1A
Sun Feb 05, 2017 9:11 pm
Forum: Balancing Redox Reactions
Topic: Conductor as an Electrode
Replies: 3
Views: 398

Conductor as an Electrode

Hi everyone! On page 48 of the course reader, it says to use Pt as the inert conductor as the electrode to transfer the electrons. I was wondering where they got the Pt from. Is it just a random element to transfer the electrons?
by Jennifer_Lam_1A
Tue Jan 31, 2017 1:09 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Finding C in Chapter 9 #19
Replies: 1
Views: 308

Finding C in Chapter 9 #19

When finding the entropy of step 1, why isn't C multiplied by (5/2) as the question says that it is at constant pressure?
by Jennifer_Lam_1A
Mon Jan 30, 2017 12:19 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Chapter 8 Number 73
Replies: 1
Views: 329

Re: Chapter 8 Number 73

On the reactant side, there are 2 C-H bonds, but the coefficient says 3, so technically, there are 6 bonds. On the products side, there are 6 C-H bonds. Those cancel out so you don't need to take them into account when calculating the reaction enthalpy. Hope this helps :)
by Jennifer_Lam_1A
Fri Jan 27, 2017 12:29 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Practice Quiz Answers
Replies: 8
Views: 940

Practice Quiz Answers

I was looking at the practice quiz in the back of the course reader and I wasn't able to find the answers to check my work. Does anyone know if there is an answer key?
by Jennifer_Lam_1A
Wed Jan 25, 2017 12:37 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gas Phase Only vs Liquid Phase Only
Replies: 1
Views: 283

Gas Phase Only vs Liquid Phase Only

In lecture today, we went over page 39 in the course reader. Can someone please explain how do you know if it is a "gas phase only" reaction (T>333 K) or if it is a "liquid phase only" (T<333 K) I understand how to find T and I understand why we have to look at this problem in th...
by Jennifer_Lam_1A
Wed Jan 18, 2017 5:09 pm
Forum: Phase Changes & Related Calculations
Topic: Steam Burns [ENDORSED]
Replies: 3
Views: 502

Steam Burns [ENDORSED]

Can someone please reexplain why steam causes more severe burns than boiling water? Thanks!
by Jennifer_Lam_1A
Wed Jan 18, 2017 5:08 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy
Replies: 8
Views: 1009

Re: Enthalpy

For temperature, should it be in Celsius or Kelvin?
by Jennifer_Lam_1A
Tue Nov 29, 2016 4:20 pm
Forum: *Titrations & Titration Calculations
Topic: ICE
Replies: 5
Views: 656


I think you're referring to when approximating x. You omit the x in the denominator just to approximate x. Once you find the x, divide it by the molarity given. If it is smaller than 5%, it is a good approximation. I hope that answers your question!
by Jennifer_Lam_1A
Sun Nov 27, 2016 8:30 pm
Forum: Conjugate Acids & Bases
Topic: Resonance and Stability
Replies: 1
Views: 344

Resonance and Stability

I wrote in my course reader that resonance affects the stability of the anion. Can someone explain to me how this works? (unless I wrote it down completely wrong haha)
by Jennifer_Lam_1A
Tue Nov 15, 2016 12:53 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Calculating the Equilibrium Composition [ENDORSED]
Replies: 2
Views: 534

Calculating the Equilibrium Composition [ENDORSED]

How would you know if it's -x or +x for the change in molar concentration? (p. 137 of Course Reader)
by Jennifer_Lam_1A
Mon Nov 07, 2016 6:32 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: z<8 and z>8
Replies: 1
Views: 772

z<8 and z>8

When do you use when z>8 and z<8 for the molecular orbital diagram? What exactly is z?
by Jennifer_Lam_1A
Wed Nov 02, 2016 1:03 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle
Replies: 1
Views: 318

Bond Angle

On page 98 of the course reader, it says that H2O has a bond angle of 104.5 as opposed to 109.5. Can someone please explain this to me? If this question were on an assessment, do we have to specifically say 104.5 or can we just indicate that it would be around/less than 109.5? Thanks in advance!
by Jennifer_Lam_1A
Mon Oct 24, 2016 6:01 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration for Ions
Replies: 4
Views: 529

Electron Configuration for Ions

How would you write the electron configuration for Iodine2- using the noble gas abbreviation? Would you use [Xe] or [Kr]?
by Jennifer_Lam_1A
Wed Oct 19, 2016 1:18 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Px, Py, Pz [ENDORSED]
Replies: 1
Views: 540


When do you know when to use Px, Py, and Pz respectively? Is it okay to, when writing the electron configuration, to just generalize it as just P?
by Jennifer_Lam_1A
Mon Oct 10, 2016 7:41 pm
Forum: Significant Figures
Topic: Electron Emission Sig Figs
Replies: 2
Views: 396

Electron Emission Sig Figs

Hi everyone! I had a question regarding the sigfigs about electron emission. When using Rydberg's equation, certain questions only give out the energy level (i.e. n=3). When calculating the answer, do we use the sigfigs given in the Rydberg constant or from the energy level? Here is Rydberg's equati...
by Jennifer_Lam_1A
Tue Oct 04, 2016 6:12 pm
Forum: DeBroglie Equation
Topic: Worked Example on page 52 in the Course Reader
Replies: 2
Views: 417

Worked Example on page 52 in the Course Reader

Hi everyone! In lecture, someone asked what constitutes "measurable wavelike properties" to which Professor Lavelle answered 10^-15. Is that number applicable to all objects? If so, does that mean that a wavelength smaller does NOT have the properties whereas a wavelength that is greater D...
by Jennifer_Lam_1A
Mon Sep 26, 2016 8:44 pm
Forum: Student Social/Study Group
Topic: Rieber Hall 14A Study Group (Fall 2016)
Replies: 49
Views: 7271

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

Same same I'm down! I'm in 2N but i'm totally cool with going to any floor!

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