Search found 27 matches

by Julia Ward 2C
Sat Mar 17, 2018 7:34 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Test 2 #5a
Replies: 1
Views: 104

Test 2 #5a

Can someone help me with Test 2 #5a?
by Julia Ward 2C
Sat Mar 17, 2018 7:32 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Test 2 #7
Replies: 3
Views: 176

Test 2 #7

Can someone help me out with Test 2 #7?
by Julia Ward 2C
Wed Mar 14, 2018 9:45 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Reaction Diagrams
Replies: 1
Views: 213

Reaction Diagrams

For the Reaction Diagrams/Graphs that we draw for Kinetics and Thermo, are PE/E and G interchangeable for the y-axis?
by Julia Ward 2C
Sun Mar 11, 2018 10:52 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 6
Views: 267

Cell Diagrams

In a cell diagram, how do you determine which atom/molecule goes first?

EX. Test Question #6C
by Julia Ward 2C
Sun Mar 11, 2018 10:49 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7726
Views: 1046762

Re: Post All Chemistry Jokes Here

Once I told a chemistry joke. There was no reaction ...
by Julia Ward 2C
Sun Mar 11, 2018 10:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Last Lecture
Replies: 1
Views: 112

Last Lecture

Will Monday be our last lecture (in terms of new information)?
by Julia Ward 2C
Sun Mar 04, 2018 11:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Kinetics Test
Replies: 3
Views: 158

Kinetics Test

From what I understand, Test #3 (15.1-15.6) will correspond to all the lectures on Kinetics and 1/2 of the lecture from Friday (March 2nd)--the part before Reaction Mechanisms. Can someone confirm this?
by Julia Ward 2C
Sun Mar 04, 2018 10:55 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Reaction Mechanisms
Replies: 1
Views: 96

Reaction Mechanisms

From the lecture I understand that the slowest step determines the rate of overall reaction (and that its Step 1) will it always be Step 1 or is there a way to determine the slowest step?
by Julia Ward 2C
Sun Mar 04, 2018 7:11 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7726
Views: 1046762

Re: Post All Chemistry Jokes Here

I tell bad chemistry jokes because all the good ones argon.
by Julia Ward 2C
Sun Feb 25, 2018 8:15 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Initial Rates
Replies: 3
Views: 181

Initial Rates

Would there ever been an instance where we have to determine n and k with non-initial rates or can we assume for all questions that it will be initial rates?
by Julia Ward 2C
Sun Feb 25, 2018 8:11 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: NERNST
Replies: 4
Views: 197

NERNST

Just to clarify--the value 0.0592 V can only be used at 25 degrees C and with log Q? Can it be used with ln as well?
by Julia Ward 2C
Sun Feb 25, 2018 8:08 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7726
Views: 1046762

Re: Post All Chemistry Jokes Here

Q: Why does hamburger have lower energy than steak?
A: Because it's in the ground state.
by Julia Ward 2C
Sun Feb 11, 2018 11:41 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: troutons rule
Replies: 3
Views: 202

Re: troutons rule

It is not listed in the lecture outlines, but it is pretty simple: the definition from the book is "the empirical observation that the entropy of vaporization at the boiling point is approximately 85 J/Kmol for many liquids." Self-Test 9.7A and B are some examples of how you can use the ru...
by Julia Ward 2C
Sun Feb 11, 2018 11:00 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Gold Example
Replies: 1
Views: 77

Gold Example

Did anyone write down the example that involved gold in last Friday's lecture? I missed some parts of the lecture in my notes.
by Julia Ward 2C
Sun Feb 04, 2018 10:39 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Exothermic and Spontaneous
Replies: 4
Views: 840

Re: Exothermic and Spontaneous

An exothermic reaction is when a reaction has a net release of heat, system loses heat (ΔH is negative). Spontaneous means that the reaction happens without any added help (ie. any extra energy). Spontaneous reactions have a negative ΔG. So exothermic and endothermic reactions can be spontaneous dep...
by Julia Ward 2C
Sun Feb 04, 2018 9:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Question
Replies: 3
Views: 214

Midterm Question

Does anyone know which lecture will be the last lecture that will be on the midterm? Will it be Friday or Wednesday?
by Julia Ward 2C
Wed Jan 31, 2018 12:15 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem Community Posts
Replies: 5
Views: 392

Chem Community Posts

I apologize if this seems redundant but I am confused about the Chemistry Community post deadlines. I read on one board that it is due at 11:59pm on Sunday and overheard that it is due midnight on Sunday (aka 1 minute after 11:59pm on Saturday. Which time is correct? [is Saturday night the last time...
by Julia Ward 2C
Sun Jan 28, 2018 4:37 pm
Forum: Calculating Work of Expansion
Topic: Diagram of Reversible Expansion
Replies: 3
Views: 157

Diagram of Reversible Expansion

On the diagram of isothermal reversible expansion from lecture on Wednesday (1/24/18) it said that one side of the piston had an ideal gas, and one side was a vacuum. What exactly is a vacuum (and what does it entail/mean in the diagram)?
by Julia Ward 2C
Sun Jan 28, 2018 4:31 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Week 3 Friday Lecture
Replies: 2
Views: 96

Week 3 Friday Lecture

During the last couple minutes of the lecture, I missed the last sentence in my notes--Does anyone know what it said on the slide after "Magnitude of ΔS depends on T at which heat is transferred"? Thank you!
by Julia Ward 2C
Mon Jan 22, 2018 8:15 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Positional (Residua) Entropy
Replies: 1
Views: 109

Positional (Residua) Entropy

Can someone clarify what positional entropy is? And what is the difference between it and thermal entropy?
by Julia Ward 2C
Sun Jan 21, 2018 8:32 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: R Constant
Replies: 2
Views: 98

Re: R Constant

It depends on what values are given or what values you can find based on what is given= 0.08206 L*atm(K^-1)(mol^-1) versus 8.314 J(K^-1)(mol^-1). Notice that the units for each are different, so you use one if you are given (or can find) L and atm and the other if you are given (or can find) J.
by Julia Ward 2C
Sun Jan 21, 2018 1:35 am
Forum: Calculating Work of Expansion
Topic: Reversible vs Isothermal
Replies: 3
Views: 194

Re: Reversible vs Isothermal

I believe that a reversible expansion is when the change in pressure is infinitesimal so that the Pinternal~Pexternal and the V change is also infinitesimal. A isothermal expansion is an expansion with constant temperature.
by Julia Ward 2C
Wed Jan 17, 2018 11:30 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Units for Enthalpy [ENDORSED]
Replies: 1
Views: 102

Units for Enthalpy [ENDORSED]

I noticed on some of the answers in the solutions manual that reaction enthalpies were given in kJ and some were in kJ/mol. Can someone explain when you get which units? Does it depend on the method you use?
by Julia Ward 2C
Sun Jan 14, 2018 8:23 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: q equations
Replies: 2
Views: 133

q equations

Can someone explain the difference between q=nCmΔT versus q=10g CspΔT? Its from lecture 3 towards the end of lecture.
by Julia Ward 2C
Sun Jan 14, 2018 6:54 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Most Staple Phases
Replies: 3
Views: 135

Most Staple Phases

During lecture, did anyone write down all of the most stable phases of common elements? (I missed a few)
by Julia Ward 2C
Fri Jan 12, 2018 2:24 pm
Forum: Administrative Questions and Class Announcements
Topic: Textbook Question
Replies: 1
Views: 142

Textbook Question

I took 14A with a different professor so I was wondering approximately which chapters in the chem textbook are covered in 14A (looking to refresh on chem concepts)?

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