Search found 20 matches

by Dominique Zuk 1G
Thu Mar 16, 2017 10:46 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Ring Flip
Replies: 1
Views: 300

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?
by Dominique Zuk 1G
Thu Mar 09, 2017 8:55 pm
Forum: *Alkanes
Topic: Homework question
Replies: 1
Views: 211

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?
by Dominique Zuk 1G
Thu Mar 02, 2017 2:38 pm
Forum: *Alkanes
Topic: Naming
Replies: 1
Views: 213

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?
by Dominique Zuk 1G
Thu Feb 23, 2017 2:17 pm
Forum: General Rate Laws
Topic: catalyst
Replies: 1
Views: 315

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?
by Dominique Zuk 1G
Sun Feb 19, 2017 8:02 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Catalyst
Replies: 6
Views: 604

Catalyst

I know that a catalyst speeds up a reaction, but on the molecular level how does it do this ?
by Dominique Zuk 1G
Tue Feb 07, 2017 10:23 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 4
Views: 496

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?
by Dominique Zuk 1G
Thu Feb 02, 2017 9:10 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 13701

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.
by Dominique Zuk 1G
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: 286

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!
by Dominique Zuk 1G
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: 185

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)?
by Dominique Zuk 1G
Thu Jan 12, 2017 2:22 pm
Forum: Phase Changes & Related Calculations
Topic: Irreversible Process
Replies: 1
Views: 296

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.
by Dominique Zuk 1G
Fri Dec 02, 2016 12:58 am
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: 5 Percent Rule
Replies: 4
Views: 622

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...
by Dominique Zuk 1G
Mon Nov 21, 2016 3:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp and Kc
Replies: 1
Views: 299

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!
by Dominique Zuk 1G
Mon Nov 21, 2016 2:57 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Oxoacids
Replies: 2
Views: 395

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!
by Dominique Zuk 1G
Sat Nov 12, 2016 5:39 pm
Forum: Naming
Topic: Trans and Cis
Replies: 3
Views: 425

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?
by Dominique Zuk 1G
Sun Nov 06, 2016 7:34 pm
Forum: Hybridization
Topic: Hybrid Orbitals
Replies: 4
Views: 575

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?
by Dominique Zuk 1G
Fri Oct 28, 2016 4:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: O3 Polarity
Replies: 1
Views: 327

O3 Polarity

Could someone please explain why O3 is polar? I know the Lewis Structure for O3 is bent, but why?
by Dominique Zuk 1G
Sat Oct 22, 2016 6:21 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Radii Trends
Replies: 1
Views: 284

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...
by Dominique Zuk 1G
Tue Oct 11, 2016 6:32 pm
Forum: DeBroglie Equation
Topic: Quiz Prep 2015 #8 [ENDORSED]
Replies: 1
Views: 294

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...
by Dominique Zuk 1G
Thu Oct 06, 2016 10:48 am
Forum: Empirical & Molecular Formulas
Topic: Fundamentals M.25 Help [ENDORSED]
Replies: 1
Views: 337

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...
by Dominique Zuk 1G
Sat Oct 01, 2016 2:25 pm
Forum: Properties of Light
Topic: Spectral Lines (experimental data and model)
Replies: 2
Views: 286

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 !

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