Search found 49 matches

by Grace_Stevenson_1A
Sat Mar 18, 2017 4:15 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Why is this cis?
Replies: 7
Views: 952

Re: Why is this cis?

I understand that but what I'm confused with is what molecules we are suppose to be analyzing here for their atomic number. Thank you
by Grace_Stevenson_1A
Sat Mar 18, 2017 2:11 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Why is this cis?
Replies: 7
Views: 952

Re: Why is this cis?

Thank you but I'm
Still confused which moleculares are the highest priority? Versuses what other molecules are lowest priority?
by Grace_Stevenson_1A
Sat Mar 18, 2017 11:12 am
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Why is this cis?
Replies: 7
Views: 952

Why is this cis?

Could someone please explain to me why this is cis? Thank you!!
by Grace_Stevenson_1A
Fri Mar 17, 2017 2:59 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Simplified Nernst equation
Replies: 1
Views: 352

Simplified Nernst equation

Could anyone explain how to get .0256... because every time I calculate R times T divided by F i get a different number
by Grace_Stevenson_1A
Thu Mar 16, 2017 10:12 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Practice test #3 2014
Replies: 1
Views: 251

Practice test #3 2014

Can someone please explain number three? I don't know why cu and fe couldn't be used in the galvanic cell. Thank you!
by Grace_Stevenson_1A
Wed Mar 15, 2017 9:35 pm
Forum: *Cycloalkenes
Topic: Numbering
Replies: 1
Views: 434

Re: Numbering

Would the double bond still be number 1 or would it then be 5?
by Grace_Stevenson_1A
Wed Mar 15, 2017 9:34 pm
Forum: *Cycloalkenes
Topic: Numbering
Replies: 1
Views: 434

Numbering

Why can't this be numbered how I have it in red? Thank you!
by Grace_Stevenson_1A
Wed Mar 15, 2017 10:10 am
Forum: *Ketones
Topic: Question on number 27?
Replies: 2
Views: 505

Question on number 27?

Wouldn't 27 not be a correct name because you give priority to the functional groups?
by Grace_Stevenson_1A
Wed Mar 15, 2017 10:01 am
Forum: *Alcohols
Topic: What type of alcohol?
Replies: 1
Views: 439

What type of alcohol?

Why is number 20 a tertiary alcohol isn't it just attached to one carbon? (The carbon i outlined in purple) thank you!!!! :)))
by Grace_Stevenson_1A
Tue Mar 14, 2017 6:17 pm
Forum: *Alcohols
Topic: Homework question
Replies: 1
Views: 419

Homework question

Why in 18 is it named 2 but in 19 it's called secondary? (see photo below) thank you so much!!! Also why does the alcohol get priority over the two methyl groups? Thanks!
by Grace_Stevenson_1A
Tue Mar 14, 2017 1:00 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: When to use cis or trans?
Replies: 1
Views: 283

When to use cis or trans?

How do you know when to use cis or trans at all? Like I know what the difference is between the two but how do you know when to introduce one of those two terms at all? For example for this homework question (28) I would have just called it 3,4,6 trimethyl 3-octene but the correct name is adding a t...
by Grace_Stevenson_1A
Tue Mar 14, 2017 12:55 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Homework question
Replies: 2
Views: 297

Homework question

Why wouldn't this structure be Cis because the methyl and bromo group are on the same side of the double bond? Thanks!
by Grace_Stevenson_1A
Tue Mar 14, 2017 9:25 am
Forum: *Cycloalkanes
Topic: What is this structure?
Replies: 2
Views: 548

What is this structure?

Could anyone please tell me the name of this structure in part c? (See picture below). Thank you so much! :)
by Grace_Stevenson_1A
Mon Mar 13, 2017 4:44 pm
Forum: *Cycloalkenes
Topic: Homework question #21 a
Replies: 1
Views: 494

Homework question #21 a

Could someone please explain to me why this structure pictured below is 5,1,3 instead of 1-methyl cyclopenta, 2,4 diene because that would be lower numbers? (The red is what the solution manuals answer is)
by Grace_Stevenson_1A
Mon Mar 13, 2017 4:31 pm
Forum: *Cycloalkanes
Topic: Question on organic homework #17
Replies: 1
Views: 420

Question on organic homework #17

Could someone please explain why the answer key numbered the structure like so? (See picture correct numbers are in red). Don't you want the one that comes first alphabetically (butyl) to be one to have a lower #? Thank you so much! :)
by Grace_Stevenson_1A
Mon Mar 13, 2017 4:28 pm
Forum: Balancing Redox Reactions
Topic: Help on practice test
Replies: 4
Views: 361

Re: Help on practice test

Here is the picture of the solutions
by Grace_Stevenson_1A
Mon Mar 13, 2017 4:27 pm
Forum: Balancing Redox Reactions
Topic: Help on practice test
Replies: 4
Views: 361

Re: Help on practice test

The answer key says n is 4?
by Grace_Stevenson_1A
Sun Mar 12, 2017 2:19 pm
Forum: Balancing Redox Reactions
Topic: Help on practice test
Replies: 4
Views: 361

Help on practice test

Could someone help me find the "n" for Q4 on practice exam 2013? Thank you!
The equation is 2 Fe + 2H20 + O2---> 2Fe(OH)2
by Grace_Stevenson_1A
Mon Mar 06, 2017 4:08 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: Homework question 4.30
Replies: 2
Views: 645

Homework question 4.30

The activation energy in an organic reaction is known to be 125kj/mil. Wil this reaction occur at room temperature?

The answer is no but I'm not sure how to figure this out. Thank you in advance!
by Grace_Stevenson_1A
Sun Mar 05, 2017 3:13 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activated complex
Replies: 1
Views: 250

Activated complex

One of the homework questions for chapter 15 is draw a proposed structure for the activated complex. In general how do you figure this out? Thank you! :)
by Grace_Stevenson_1A
Thu Mar 02, 2017 2:54 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: help on 15.63
Replies: 1
Views: 307

help on 15.63

the question is: the rate constant of the reaction between CO2 and OH- in the aqueous solution to give the HCO3- ion is 1.5X10^10L*mol^-1*s*-1 at 25 degrees C. Determine the rate constant at 37 degrees celcius given that the activation energy for the rxn is 38kj/mol I am confused on what the solutio...
by Grace_Stevenson_1A
Wed Mar 01, 2017 2:17 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Question from midterm
Replies: 2
Views: 338

Question from midterm

I am unable to go to the review on Friday, so was wondering if someone could help me with this question? Thank you!! :) Q2: A system consists of two glass vessels (containers A and B) and a valve connection them. During the following process this system is maintained at 25 degrees C. Initially, the ...
by Grace_Stevenson_1A
Wed Mar 01, 2017 2:12 pm
Forum: General Rate Laws
Topic: Questions from last quiz
Replies: 1
Views: 273

Questions from last quiz

One of the questions i got wrong from the last quiz was asking us to write the rate law for the overall reaction. the slow step is H202(aq)+2I-(aq)---->I2(s) +2OH- Is the correct answer just rate=k[H2-2][I-]? How would you know what the exponents are because you dont know the order or reaction and a...
by Grace_Stevenson_1A
Fri Feb 03, 2017 3:26 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: As i goes to zero...?
Replies: 1
Views: 194

As i goes to zero...?

Can someone please explain what the "i" represents in the states in the limit as i goes to zero? Thank you!
by Grace_Stevenson_1A
Fri Feb 03, 2017 3:21 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: The Salt Bridge
Replies: 1
Views: 237

The Salt Bridge

I am kind of confused on how exactly the salt bridge works. Could someone please explain to me how the transfer of ions would keep the solution neutral? Like using Cl- ions, isn't that very electronegative and would just pull more electrons to the cathode, which would cause the cathode to start reje...
by Grace_Stevenson_1A
Sat Jan 28, 2017 12:18 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Q rev?
Replies: 1
Views: 2038

Q rev?

In the equation delta S=q rev/T, what does rev stand for and how do you get that value? Thank you!
by Grace_Stevenson_1A
Thu Jan 26, 2017 1:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Will we be given equation sheet on quiz?
Replies: 2
Views: 316

Will we be given equation sheet on quiz?

Will we be given this equation sheet on our quiz like we were last quarter? Thank you!
by Grace_Stevenson_1A
Mon Jan 23, 2017 6:27 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Phase subscript question
Replies: 2
Views: 375

Phase subscript question

What does the subscript gr mean? E.g homework 8.67 C(gr)? Thank you!
image.jpg
by Grace_Stevenson_1A
Tue Jan 17, 2017 4:47 pm
Forum: Phase Changes & Related Calculations
Topic: Practice Quizes
Replies: 10
Views: 738

Practice Quizes

Are there any answers or solution manuals available to us for the practice quiz in the course reader or way to find out if we are doing the problems correctly? Thank you! :)
by Grace_Stevenson_1A
Tue Jan 10, 2017 6:10 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: delta H and delta Q
Replies: 2
Views: 3879

delta H and delta Q

What is the difference between delta H and delta Q? Thank you!!
by Grace_Stevenson_1A
Tue Nov 29, 2016 6:50 am
Forum: Administrative Questions and Class Announcements
Topic: Class on Friday
Replies: 2
Views: 443

Class on Friday

Just to confirm, although we are not covering any. new material, there is still class on Friday? Thank you!
by Grace_Stevenson_1A
Sun Nov 27, 2016 9:09 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Fall 2014 Final Exam #6A
Replies: 1
Views: 264

Fall 2014 Final Exam #6A

can someone please explain this step? Kc=0.045 in the solutions, it says Kc=(x/1.072)^2/((0.05-x)/1.072)) and then it jumps to 0.045=.932836x^2/0.05-x

Thank you!
by Grace_Stevenson_1A
Sat Nov 26, 2016 4:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chapter 11 #117
Replies: 1
Views: 257

Chapter 11 #117

Can someone please explain 117 to me? Thank you so much! SO3 + NO <----> SO2 +NO2. K=6.0 X 10^3 Calculate the amount of NO that must be added to a 1L vessel containing .245 mol SO3 to form .240 mol SO2 at equilibrium In the solution manual they start out by subtracting .240 moles from.245 but im not...
by Grace_Stevenson_1A
Sat Nov 26, 2016 10:48 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chapter 11 #89
Replies: 1
Views: 238

Chapter 11 #89

The question asks you to calculate the equil constnat for the rxn, and gives a graph of partial pressure, ranging up to 30. However, in the solution manual, they put the partial pressure over 100, but i didnt think the graph was giving percent? thank you!
by Grace_Stevenson_1A
Thu Nov 24, 2016 11:25 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: chapter 11 #67 help happy thanksgiving! :)
Replies: 2
Views: 334

chapter 11 #67 help happy thanksgiving! :)

Question: The reaction 2HCl(g) <----> H2(g) +Cl2(g) has K=3.2 X 10^-34 at 298K. The initial partial pressures are H2, 1.0 bar; HCL, 2.0 bar; and Cl2, 3.0 bar. At equilibrium there is 1.0 mol H2(g). What is the volume of the container? The answer solution mentions that reactants are strongly favored,...
by Grace_Stevenson_1A
Sat Nov 19, 2016 7:45 am
Forum: Administrative Questions and Class Announcements
Topic: Discussion next week? [ENDORSED]
Replies: 5
Views: 3011

Discussion next week? [ENDORSED]

Will there be discussion sections next week? Thank you!
by Grace_Stevenson_1A
Tue Nov 15, 2016 3:12 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Fall 2014 Quiz #8 [ENDORSED]
Replies: 2
Views: 395

Fall 2014 Quiz #8 [ENDORSED]

The question is consider the following rxn: NH4HS (s) <---->NH3(g)+H2S(g) If the value of Kp is .11 at 300K, calculate the equilibrium partial pressure of NH3(g) starting from pure NH4HS. The answer is .33atm, but I don't know how to get that I feel like we need the initial concentration of somethin...
by Grace_Stevenson_1A
Fri Nov 11, 2016 4:07 pm
Forum: Naming
Topic: Ligand Quizlet
Replies: 2
Views: 313

Ligand Quizlet

I made a ligand quizlet if anyone wants flashcards for their naming.username GraceE2512
:) good luck studying!

here's the link too: https://quizlet.com/_2rs25s
by Grace_Stevenson_1A
Wed Nov 09, 2016 4:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: #1 chapter 11 [ENDORSED]
Replies: 2
Views: 292

Re: #1 chapter 11 [ENDORSED]

oooh I see thank you so much!!!!
by Grace_Stevenson_1A
Wed Nov 09, 2016 10:50 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: #1 chapter 11 [ENDORSED]
Replies: 2
Views: 292

#1 chapter 11 [ENDORSED]

We have to state whether the statement is true or false -An equilibrium reaction is not affected by increasing the concentrations of products Answer book: False because equil. reactions are affected by the presence of both reactants and products -An equil. reaction with a higher pressure of reactant...
by Grace_Stevenson_1A
Mon Oct 31, 2016 7:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: bond angle
Replies: 3
Views: 411

bond angle

for our midterm, will we be asked to give the bond angle of each shape? if so, how do we calculate the bond angle or is it just something we have to memorize. thank you!
by Grace_Stevenson_1A
Wed Oct 19, 2016 5:52 pm
Forum: Quantum Numbers and The H-Atom
Topic: chapter 2 Question 2.29
Replies: 1
Views: 285

chapter 2 Question 2.29

the Question is how many electrons can have the following quantum #s if all of that subshell are filled? (a) n=4, l=2. the answer in the manual is 6. why isn't it 10 because you can have m sub l=-2,-1,0,1,2 (5 subshells) and then two electrons in each of those because they have differnt spins? Thank...
by Grace_Stevenson_1A
Wed Oct 19, 2016 5:42 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Chapter 2 Question 2.43 [ENDORSED]
Replies: 2
Views: 340

Chapter 2 Question 2.43 [ENDORSED]

the question is asks "write the ground-state electron configuration expected for each of the following elements.
can someone explain to me why the answer to silver is [kr] 4d105s1 and not 4d9? Because don't we count 9 valence electrons in the d to get to silver? thank you!
by Grace_Stevenson_1A
Sun Oct 09, 2016 3:26 pm
Forum: DeBroglie Equation
Topic: #9 on practice test [ENDORSED]
Replies: 3
Views: 473

#9 on practice test [ENDORSED]

For #9 on practice quiz fall 2014, is there a reason why the answer in the course book only has one significant figure? Also does anyone have any good ways to remember all the equations for the quiz this week? thank you! :)
by Grace_Stevenson_1A
Mon Oct 03, 2016 11:50 am
Forum: DeBroglie Equation
Topic: Question about baseball wavelenghts [ENDORSED]
Replies: 3
Views: 597

Question about baseball wavelenghts [ENDORSED]

Im confused as to why we can't detect the wavelengths of baseball's momentum but we can of electrons? It was something that was repeated in the video module, but I am still confused as to why that is. Thank you!
by Grace_Stevenson_1A
Wed Sep 28, 2016 10:58 am
Forum: Properties of Light
Topic: Photoelectric effect video
Replies: 3
Views: 403

Re: Photoelectric effect video

Thank you!
by Grace_Stevenson_1A
Wed Sep 28, 2016 10:41 am
Forum: Properties of Light
Topic: Photoelectric effect video
Replies: 3
Views: 403

Photoelectric effect video

I was watching the video module for the photoelectric effect and it mentioned how increasing the intensity did not cause electrons to be released from the metal..why is that? Why does shortening the wavelength release electrons. isn't the relationship between intensity and wavelength an inverse rela...

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