## Search found 21 matches

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?
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?
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.
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?
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?
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?
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 :)
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?
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...
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!
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?
Tue Nov 29, 2016 4:20 pm
Forum: *Titrations & Titration Calculations
Topic: ICE
Replies: 5
Views: 656

### Re: ICE

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!
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)
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)
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?
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!
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]?
Wed Oct 19, 2016 1:18 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Px, Py, Pz [ENDORSED]
Replies: 1
Views: 540

### Px, Py, Pz[ENDORSED]

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?
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...
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...
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!

Go to advanced search