Search found 25 matches
- Thu Mar 10, 2016 4:06 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Interpreting activation energy from a graph
- Replies: 1
- Views: 816
Re: Interpreting activation energy from a graph
On the bottom of Page 77, the slope for those two graphs is -EA / R , which is why the lines are heading downwards. The larger the EA , the steeper the negative slope gets.
- Mon Mar 07, 2016 12:21 pm
- Forum: *Cycloalkenes
- Topic: Phenyl
- Replies: 1
- Views: 473
Phenyl
I keep seeing the name "Phenyl" used in the workbook. I don't recall going over it in class. Does phenyl apply to the ring structure, or the functional substituent attached to the ring?
- Sun Feb 28, 2016 9:06 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Question 4.31
- Replies: 1
- Views: 555
Question 4.31
In part of the answer explanation, it's stated that Ea1 > Ea2 and therefore k1 < k2 .
How does one come to that conclusion? Why isn't k1 greater than k2 ?
How does one come to that conclusion? Why isn't k1 greater than k2 ?
- Sat Feb 27, 2016 10:29 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Midterm 2011 Q4
- Replies: 1
- Views: 400
Midterm 2011 Q4
In the answer, there's a part where it says K = 2x/x2 = 10
Where did the 2x and the x2 come from?
Where did the 2x and the x2 come from?
- Sat Feb 20, 2016 7:45 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: 2016 Midterm Q5C
- Replies: 1
- Views: 517
2016 Midterm Q5C
On Question 5C, can anyone explain why Q = (1/4)K? Why isn't it Q = 4K? Thanks!
- Sat Feb 13, 2016 11:42 pm
- Forum: General Rate Laws
- Topic: Postive Rate Values
- Replies: 1
- Views: 372
Postive Rate Values
Why do we always want to work with positive reaction rates?
- Tue Feb 09, 2016 5:38 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Quiz 1 Q3
- Replies: 3
- Views: 700
Re: Quiz 1 Q3
Are we expected to use all of the data listed under "useful information"? For example, I don't see how I can apply the specific heat of the steam into my final answer.
- Mon Feb 01, 2016 10:43 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram (14.11 b)
- Replies: 2
- Views: 491
Re: Cell Diagram (14.11 b)
Super helpful. Thanks a ton!
- Mon Feb 01, 2016 6:46 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst equation variation
- Replies: 1
- Views: 459
Nernst equation variation
In the 2016 course reader at the top of page 54, one variation of the nernst equation is shown, where "2.303RT" is in the numerator. Where did the 2.303 come from?
- Sun Jan 31, 2016 11:01 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram (14.11 b)
- Replies: 2
- Views: 491
Cell Diagram (14.11 b)
For the question, the book claims states that Cl2 becomes Cl-, making it the cathode. Couldn't the Hydrogen half reaction be reversed, becoming the cathode? Why was the Chloride half reaction reversed?
- Sun Jan 31, 2016 6:40 pm
- Forum: Balancing Redox Reactions
- Topic: Coulomb
- Replies: 4
- Views: 956
Re: Coulomb
Okay, thanks so much.
- Sun Jan 31, 2016 5:03 pm
- Forum: Balancing Redox Reactions
- Topic: Coulomb
- Replies: 4
- Views: 956
Coulomb
It says in the course reader that a volt is a joule of work per coulomb of charge. What is a coulomb, and is it described anywhere in the course reader? Thanks.
- Sat Jan 23, 2016 10:00 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Spontaneous Reactions
- Replies: 1
- Views: 397
Spontaneous Reactions
In the quiz book, 8) on the first practice quiz states that the Chloride reaction is spontaneous at high temperatures. Is that the case for all reactions? Or are there other factors that affect spontaneity?
- Thu Jan 14, 2016 11:59 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Calculating Standard Enthalpy of formation 8.63
- Replies: 1
- Views: 531
Re: Calculating Standard Enthalpy of formation 8.63
Hi, I also want to echo: I came across the same situation with K2S equaling a different value in the appendix compared to the answer. For the H20 value, I think the book used the standard enthalpy of formation value found on page 295. Why the value is different from the appendix, I don't really know.
- Sun Jan 10, 2016 12:59 am
- Forum: General Science Questions
- Topic: Liter conversions
- Replies: 1
- Views: 834
Liter conversions
Does anyone know why 1 Liter equals 0.001 m^3, while also equalling 1000 cm^3? I don't understand the conversion process now that the cubic units are involved.
- Tue Dec 01, 2015 12:33 pm
- Forum: Significant Figures
- Topic: VIDEO: A Lesson/Song about Sig Figs
- Replies: 3
- Views: 842
Re: VIDEO: A Lesson/Song about Sig Figs
Yeah, I posted the video before the deadline on an earlier post of mine as a link to YouTube. Chem Mod told me yesterday to re upload it as a QuickTime attachment to receive full credit.
- Tue Dec 01, 2015 1:34 am
- Forum: Significant Figures
- Topic: VIDEO: A Lesson/Song about Sig Figs
- Replies: 3
- Views: 842
VIDEO: A Lesson/Song about Sig Figs
This is a short, informative video that discusses one way in determining the number of sig figs in a question.
- Thu Nov 19, 2015 3:54 am
- Forum: Significant Figures
- Topic: VIDEO: A Lesson/Song about Sig Figs
- Replies: 2
- Views: 809
VIDEO: A Lesson/Song about Sig Figs
This is a short, informative video that discusses one way in determining the number of sig figs in a question.
https://www.youtube.com/watch?v=NT9A6aoTPbg
Sean Ezenwugo
704627952
https://www.youtube.com/watch?v=NT9A6aoTPbg
Sean Ezenwugo
704627952
- Sun Oct 18, 2015 8:10 pm
- Forum: Properties of Light
- Topic: Homework problem 3.57
- Replies: 2
- Views: 570
Re: Homework problem 3.57
I don't know how many bonds are possible, but I do know that an expanded octet is possible for the elements in period 3.
- Sat Oct 17, 2015 8:53 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: L35: What does t mean?
- Replies: 1
- Views: 1667
Re: L35: What does t mean?
Hello! The t stands for metric tons, in this instance. 1 metric ton = 1000 kgs.
- Sun Oct 11, 2015 9:14 pm
- Forum: Photoelectric Effect
- Topic: Work Function
- Replies: 1
- Views: 527
Re: Work Function
You can use the function below to convert eV into Joules:
1 eV = 1.602 x 10^-19 J
You can find it on the back of the laminated periodic table, or on pg 8 on the Fall 2015 Workbook.
Hope this helps!
1 eV = 1.602 x 10^-19 J
You can find it on the back of the laminated periodic table, or on pg 8 on the Fall 2015 Workbook.
Hope this helps!
- Tue Oct 06, 2015 9:13 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Nodal Planes
- Replies: 3
- Views: 1293
Re: Nodal Planes
Oh! I had meant the d-orbitals, lying on two axes.
- Tue Oct 06, 2015 4:13 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Nodal Planes
- Replies: 3
- Views: 1293
Nodal Planes
Just to clarify: If I were to look at a p-orbital modeled on an x and y axis, the nodal plane would be located at the origin (0,0), right?
- Sun Sep 27, 2015 9:36 pm
- Forum: Significant Figures
- Topic: The Meaning of Mantissa
- Replies: 2
- Views: 1041
Re: The Meaning of Mantissa
That makes sense, thank you so much!
- Sun Sep 27, 2015 6:14 pm
- Forum: Significant Figures
- Topic: The Meaning of Mantissa
- Replies: 2
- Views: 1041
The Meaning of Mantissa
Hello, there's the use of the word "Mantissa" in the Fall 2015 course reader on page 29. I think it has some correlation with logarithms and sfs, but that's all I know. Does anyone know more information regarding the term "Mantissa"? Thank you.