Search found 20 matches
- Thu Mar 16, 2017 10:46 pm
- Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
- Topic: Ring Flip
- Replies: 1
- Views: 379
Ring Flip
In a few of the homework questions in Chapter 3 of the Organic Chemistry book we are asked to draw a "ring flip". Could someone please briefly explain what a ring flip is and how we can draw one on a structure?
- Thu Mar 09, 2017 8:55 pm
- Forum: *Alkanes
- Topic: Homework question
- Replies: 1
- Views: 308
Homework question
From the chapter 1 homework question #12b, why is hte answer 3,4,4 trimethyl 2 pentene instead of 2,2,3trimethyl 2 pentene?
Naming
On page 93 of the course reader, why is it 4-ethyl,2,2-Dimethyl-hexane instead of 3-ethyl, 5,5-dimethyl-hexane? Wouldn't you give priority to the first alphabetized component with the smaller value? So why is it 4 instead of 3?
- Thu Feb 23, 2017 2:17 pm
- Forum: General Rate Laws
- Topic: catalyst
- Replies: 1
- Views: 386
catalyst
Can you include a catalyst in a rate law? I know you shouldn't include the intermediate in the rate law, so would you carry out the same process for the intermediate as you would the catalyst?
- Sun Feb 19, 2017 8:02 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Catalyst
- Replies: 6
- Views: 769
Catalyst
I know that a catalyst speeds up a reaction, but on the molecular level how does it do this ?
- Tue Feb 07, 2017 10:23 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagrams
- Replies: 4
- Views: 611
Cell Diagrams
Could someone please explain how to write and analyze a cell diagram? I'm having trouble deciphering which aspect of the cell diagram represents the anode and cathode, and how do we know which direction the half equations go in?
- Thu Feb 02, 2017 9:10 am
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 1 Preparation Answers
- Replies: 130
- Views: 17978
Re: Quiz 1 Preparation Answers
For #3 on the practice quiz, why do we ignore the change in pressure? To solve it, we use the reversible equation for work which regards a change in Volume, but not a change in pressure.
- Tue Jan 24, 2017 1:34 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Number 57 in Chapter 8 Homework
- Replies: 2
- Views: 360
Number 57 in Chapter 8 Homework
For number 57 in the chapter 8 homework, how can one derive the equations that we need to use for Hess' Law? They aren't given in the problem, so could someone possibly explain the steps behind setting up the problem? Thank you!
- Thu Jan 19, 2017 2:02 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Work equation
- Replies: 1
- Views: 252
Work equation
In the work equation, w=-(summation of v1 to v2)(Pdv), what is the purpose and function of the summation part? Why is this incorporated into the equation when another equation is w=(p)(deltaV)?
- Thu Jan 12, 2017 2:22 pm
- Forum: Phase Changes & Related Calculations
- Topic: Irreversible Process
- Replies: 1
- Views: 366
Irreversible Process
In the book, an irreversible process is explained as an "expansion against an external pressure that differs by a finite amount". Could someone possibly explain this please? I don't really understand the definition.
- Fri Dec 02, 2016 12:58 am
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: 5 Percent Rule
- Replies: 4
- Views: 881
Re: 5 Percent Rule
He's implying that when you have an extremely large quantity of something, and if you take an almost negligible amount from it, you basically still have the same amount you started with. That's why for some of the acid/base problems you can assume that "X" is 0, because if it's such a smal...
- Mon Nov 21, 2016 3:00 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kp and Kc
- Replies: 1
- Views: 378
Kp and Kc
When asked to give two different equations for Kp and Kc, how do they differ? Could someone please explain what needs to be included in each of these different equilibrium constants? Thanks!
- Mon Nov 21, 2016 2:57 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Oxoacids
- Replies: 2
- Views: 520
Oxoacids
Could someone please explain why Hypochlorous acid (ClOH) is more acidic than Hypoiodous acid (IOH) as shown in the course reader on page 154? I know it has to do with the electronegativity values, but could someone please elaborate on it further? Thanks!
- Sat Nov 12, 2016 5:39 pm
- Forum: Naming
- Topic: Trans and Cis
- Replies: 3
- Views: 555
Trans and Cis
When naming compounds, how do I distinguish between using the prefixes "trans" and "cis"? When are they required, and when are they not?
- Sun Nov 06, 2016 7:34 pm
- Forum: Hybridization
- Topic: Hybrid Orbitals
- Replies: 4
- Views: 842
Hybrid Orbitals
I know how to find the hybridization, however I am confused by the conceptual aspect behind it. Can someone please explain, for example, sp3 hybridization and how you can tell if an atom has sp3 hybridization besides just looking at the number of regions subtracted by one?
- Fri Oct 28, 2016 4:43 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: O3 Polarity
- Replies: 1
- Views: 438
O3 Polarity
Could someone please explain why O3 is polar? I know the Lewis Structure for O3 is bent, but why?
- Sat Oct 22, 2016 6:21 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic Radii Trends
- Replies: 1
- Views: 364
Ionic Radii Trends
On page 70 in the Course Reader, a diagram is presented that shows the ionic radii trends. As it states, the ionic radii trends increase down a group and decrease across a period. However, the diagram shows the radii initially decreasing, then enlarging and decreasing again (i notice the periodic ta...
- Tue Oct 11, 2016 6:32 pm
- Forum: DeBroglie Equation
- Topic: Quiz Prep 2015 #8 [ENDORSED]
- Replies: 1
- Views: 379
Quiz Prep 2015 #8 [ENDORSED]
On number 8 for Quiz Prep 2015 in the workbook, why do you use the speed of light equation, (c=(lambda)(v)), instead of using the debroglie equation to find the wavelength? In the debroglie equation, we could separate the "p" value to the mass of the electron and the "v" that was...
- Thu Oct 06, 2016 10:48 am
- Forum: Empirical & Molecular Formulas
- Topic: Fundamentals M.25 Help [ENDORSED]
- Replies: 1
- Views: 420
Fundamentals M.25 Help [ENDORSED]
Though I've looked through the solutions manual for this problem (M.25 Fundamentals section), I still don't conceptually understand why the particular steps were taken to solve for the percent purity. We were given percentages of C (77.48%) and H (5.20%) that were present in the sample, and must cal...
- Sat Oct 01, 2016 2:25 pm
- Forum: Properties of Light
- Topic: Spectral Lines (experimental data and model)
- Replies: 2
- Views: 420
Spectral Lines (experimental data and model)
Could someone possibly elaborate on the origin of spectral lines, and how they are formed/able to be seen? Also, the concepts of the Lyman and Balmer series confused me; any clarification on these topics would be much appreciated !