Search found 45 matches

by Mishta Stanislaus 1H
Sun Mar 18, 2018 9:45 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: State Functions
Replies: 4
Views: 255

Re: State Functions

I believe those four are the answers.
by Mishta Stanislaus 1H
Sun Mar 18, 2018 9:37 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: catalysts
Replies: 3
Views: 373

Re: catalysts

a catalyst is present before a reaction takes place, as opposed to an intermediate that is present after the reaction takes place.
by Mishta Stanislaus 1H
Sun Mar 18, 2018 9:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 200
Views: 41283

Re: Saying Thank You to Dr. Lavelle

Dear Dr. Lavelle, Thank you so much of your dedication to teaching. I really came into this class without a strong chemistry background but I rarely felt like that out me at a disadvantage. These past two quarters have really made be appreciate chemistry and all of its real world applications. Thank...
by Mishta Stanislaus 1H
Sun Mar 18, 2018 9:26 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: nucleophiles
Replies: 3
Views: 388

Re: nucleophiles

"A nucleophile is a chemical species that donates an electron pair to an electrophile to form a chemical bond in relation to a reaction"
by Mishta Stanislaus 1H
Sun Mar 18, 2018 9:21 pm
Forum: *ChemDraw
Topic: draw
Replies: 1
Views: 281

Re: draw

Can you expand? We did have to draw a lewis structure is thats what you're talking about.
by Mishta Stanislaus 1H
Sun Mar 11, 2018 11:07 pm
Forum: Calculating Work of Expansion
Topic: Midterm Q4A
Replies: 3
Views: 107

Re: Midterm Q4A

Because the external pressure was constant the process was irreversible, and that equation is for reversible processes.
by Mishta Stanislaus 1H
Sun Mar 11, 2018 11:03 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Molar Entropy
Replies: 9
Views: 358

Re: Molar Entropy

Jacquelyn Hill 1 wrote:Also, is the size a more significant factor in determining this than the state that the molecule is in?


I have this same question.
by Mishta Stanislaus 1H
Sun Mar 11, 2018 11:01 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: Relation between k and activation energy
Replies: 5
Views: 491

Relation between k and activation energy

What exactly is the relationship between k and activation energy?
by Mishta Stanislaus 1H
Wed Mar 07, 2018 2:33 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Unique rates
Replies: 4
Views: 149

Re: Unique rates

Yes this could potentially and most likely will be on the test.
by Mishta Stanislaus 1H
Sun Feb 25, 2018 9:16 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Units
Replies: 7
Views: 474

Re: Units

Bryan Vega 2E wrote:Unless the question specifically asks you to state your answer in a particular unit, it does not matter what units you choose to use.

So essentially you choose?
by Mishta Stanislaus 1H
Sun Feb 25, 2018 9:13 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Chapter 15 related videos
Replies: 6
Views: 181

Re: Chapter 15 related videos

Julianna Thrasher 1B wrote:I like Crash Course by John Green! Very basic review just to remind you of topics in the chapter. https://www.youtube.com/watch?v=7qOFtL3VEBc

I found this video to be a helpful overview!
by Mishta Stanislaus 1H
Sun Feb 18, 2018 10:25 pm
Forum: Balancing Redox Reactions
Topic: Test #2
Replies: 5
Views: 140

Re: Test #2

And all lecture material up to last Friday
by Mishta Stanislaus 1H
Sun Feb 18, 2018 10:20 pm
Forum: Balancing Redox Reactions
Topic: Half-Reactions on Test 2
Replies: 5
Views: 166

Re: Half-Reactions on Test 2

Mishta Stanislaus 1H wrote:In a UA session we were told that he would provide a long list of half reactions and we would just have to choose from the list which are useful per problem.


With the standard reduction potentials given as well
by Mishta Stanislaus 1H
Sun Feb 18, 2018 10:19 pm
Forum: Balancing Redox Reactions
Topic: Half-Reactions on Test 2
Replies: 5
Views: 166

Re: Half-Reactions on Test 2

In a UA session we were told that he would provide a long list of half reactions and we would just have to choose from the list which are useful per problem.
by Mishta Stanislaus 1H
Sun Feb 18, 2018 10:16 pm
Forum: Balancing Redox Reactions
Topic: Test 2
Replies: 5
Views: 138

Re: Test 2

I was told by a UA that he provides a long list of half reactions and we just have to find with ones we need for the specific problem from the list
by Mishta Stanislaus 1H
Sun Feb 11, 2018 11:42 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Test #7
Replies: 7
Views: 238

Re: Test #7

The correct answer given during the review session was 16 degrees Celsius.
by Mishta Stanislaus 1H
Sun Feb 11, 2018 11:39 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Revsersible vs. Irreversible reactions
Replies: 3
Views: 119

Re: Revsersible vs. Irreversible reactions

The equations also differ
reversible work, W=-nRTln(v2/v1)
irreversible work, W= -Pext (v2-v1)
by Mishta Stanislaus 1H
Sun Feb 11, 2018 11:31 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Cp v. Cv!
Replies: 5
Views: 182

Re: Cp v. Cv!

Hi! I've been struggling with the same question but in the review session we were told that unless the problem specifically says that pressure is constant we use Cv.
by Mishta Stanislaus 1H
Mon Feb 05, 2018 7:37 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy Equations
Replies: 3
Views: 119

Re: Gibbs Free Energy Equations

In friday's lecture (and other prior unrelated lectures), Dr. Lavelle set two gibbs free energy equations equal to each other. Can we assume that we can set any of these equations for gibbs free energy equal to each other? (not standard gibbs free energy because that's not the same as just gibbs fr...
by Mishta Stanislaus 1H
Mon Feb 05, 2018 7:34 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Equations
Replies: 4
Views: 132

Re: Equations

I don’t think this will be required for us to know
by Mishta Stanislaus 1H
Mon Feb 05, 2018 7:33 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G equal Zero [ENDORSED]
Replies: 4
Views: 130

Delta G equal Zero [ENDORSED]

Des delta G and delta S have to equal zero for a reaction to be reversible? Can someone explain the reason?
by Mishta Stanislaus 1H
Sun Jan 28, 2018 4:30 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: degeneracy
Replies: 3
Views: 96

Re: degeneracy

This discussion helped me understand degeneracy a lot better,
viewtopic.php?t=9912
by Mishta Stanislaus 1H
Sun Jan 28, 2018 4:26 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy vs. Degeneracy [ENDORSED]
Replies: 5
Views: 166

Re: Entropy vs. Degeneracy [ENDORSED]

This discussion helped be understand the distinction much better, hope it helps!
viewtopic.php?t=9912
by Mishta Stanislaus 1H
Tue Jan 23, 2018 12:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 3 Test Topic is endorsed
Replies: 37
Views: 1675

Re: Week 3 Test Topic is endorsed

Natalie LeRaybaud 1G wrote:After going through the homework I noticed numbers 3-13,25-31, and 47-49 all have to do with calculating work or internal energy. I would suggest studying all the other homework problems specifically for this upcoming test.


Can anyone else confirm that these problems aren't going to be tested on?
by Mishta Stanislaus 1H
Sun Jan 21, 2018 8:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 3 Test Topic is endorsed
Replies: 37
Views: 1675

Re: Week 3 Test Topic is endorsed

Miranda 1J wrote:For the test do we need to know how to derive the work equation? I know Dr. Lavelle said work and DU won't be on the test but this seems like a conceptual thing to me so I'm not entirely sure.



I have this same question
by Mishta Stanislaus 1H
Sun Jan 21, 2018 8:47 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Specific enthalpy
Replies: 1
Views: 110

Specific enthalpy

Do we need to know about the specific enthalpy?
by Mishta Stanislaus 1H
Sun Jan 21, 2018 8:46 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Problem 8.99
Replies: 6
Views: 216

Re: Problem 8.99

On the test will the enthalpy of formation values be provided in the problem or do we have to memorize?
by Mishta Stanislaus 1H
Sun Jan 14, 2018 5:51 pm
Forum: Phase Changes & Related Calculations
Topic: Endo and Exothermic Ways to Remember
Replies: 28
Views: 1957

Re: Endo and Exothermic Ways to Remember

I usually think about the prefixes. The "en" in endothermic sounds like in and the "ex" in exothermic reminds me of exit.
by Mishta Stanislaus 1H
Sun Jan 14, 2018 4:26 pm
Forum: Phase Changes & Related Calculations
Topic: Constant temperature
Replies: 3
Views: 118

Constant temperature

During a phase change, say from solid to liquid, why does the temperature remain constant and not increase?
by Mishta Stanislaus 1H
Sat Dec 09, 2017 5:11 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 12.23 [ENDORSED]
Replies: 7
Views: 365

Re: 12.23 [ENDORSED]

elliekauffman1I wrote:Why is Kw=x^2? Doesn't that imply that H3O and OH are the same value? And if so, then how are we supposed to know that?


I also need help with this question
by Mishta Stanislaus 1H
Tue Dec 05, 2017 10:15 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 12.67
Replies: 1
Views: 117

12.67

Rank the following solutions in order of increasing pH: (a) 1.0 10 5 m HCl(aq); (b) 0.20 m CH3NH3Cl(aq); (c) 0.20 m CH3COOH(aq); (d) 0.20 m C6H5NH2(aq). Justify your ranking. For this problem would be expected to know the answer without a specific K or Kb value, because the solution manual doesn’t u...
by Mishta Stanislaus 1H
Sun Nov 26, 2017 10:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Aqueous and Gaseous Phases
Replies: 3
Views: 154

Re: Aqueous and Gaseous Phases

Could someone please expand on this answer?
by Mishta Stanislaus 1H
Sun Nov 26, 2017 10:01 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 81
Views: 26204

Re: Reading the textbook [ENDORSED]

I️ think the best way to approach the textbook is by using the lecture notes as a sort of outline for the book. That way you can focus on the relevant informations as delivered in class. This method weeds out some of the overly complex detail in the textbook. Hope that helps!
by Mishta Stanislaus 1H
Mon Nov 13, 2017 12:18 am
Forum: Octet Exceptions
Topic: Radical [ENDORSED]
Replies: 2
Views: 164

Radical [ENDORSED]

What is the best way to determine where the radical will be placed?
by Mishta Stanislaus 1H
Mon Nov 13, 2017 12:15 am
Forum: Bond Lengths & Energies
Topic: Bond Length
Replies: 8
Views: 698

Re: Bond Length

We can determine the bond length by seeing how many electrons are being shared. The higher the bond order, the stronger the pull between the atoms and the shorter the length of the bond. Hope that helps!
by Mishta Stanislaus 1H
Sun Oct 29, 2017 10:19 pm
Forum: Quantum Numbers and The H-Atom
Topic: Trouble on a question I seen on the internet relating to this topic we learned in class!
Replies: 3
Views: 185

Re: Trouble on a question I seen on the internet relating to this topic we learned in class!

Hello, just to clear up any confusion I believe the answer above is the correct one, Zinc, as opposed to the previous answer because the 3d orbital is listed first but the 4s must be filled first.
by Mishta Stanislaus 1H
Sun Oct 29, 2017 10:14 pm
Forum: Quantum Numbers and The H-Atom
Topic: P-Orbital
Replies: 5
Views: 262

Re: P-Orbital

Just a reiteration, but yes you could switch those variables. They serve the purpose of showing the orbital is three dimensional.
by Mishta Stanislaus 1H
Sun Oct 22, 2017 10:43 pm
Forum: *Shrodinger Equation
Topic: HΨ=EΨ [ENDORSED]
Replies: 5
Views: 589

Re: HΨ=EΨ [ENDORSED]

The purpose was to be able to find the m,l,etc, values I believe .
by Mishta Stanislaus 1H
Sun Oct 22, 2017 10:41 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Px, Py, Pz
Replies: 10
Views: 457

Re: Px, Py, Pz

I'm curious about this as well, will we be penalized for doing it a different way as him?
by Mishta Stanislaus 1H
Sun Oct 15, 2017 10:35 pm
Forum: Properties of Electrons
Topic: Atomic Spectra [ENDORSED]
Replies: 3
Views: 254

Re: Atomic Spectra [ENDORSED]

I understand the second half of the explanation, just not the first concerning the division of one by the number of wavelengths.
by Mishta Stanislaus 1H
Sun Oct 15, 2017 2:03 pm
Forum: Photoelectric Effect
Topic: Post Assessment #28 [ENDORSED]
Replies: 4
Views: 241

Re: Post Assessment #28 [ENDORSED]

To answer this question you must convert the given work function from kJ to J. Then you must divide by avagadro's number to find the energy required per atom as opposed to per mole.
by Mishta Stanislaus 1H
Mon Oct 09, 2017 10:44 pm
Forum: Properties of Light
Topic: Amplitude
Replies: 6
Views: 356

Amplitude

I understand that wave length and frequency have and inverse relationship due to the given equation, but does amplitude relate to these in any way?
by Mishta Stanislaus 1H
Mon Oct 09, 2017 10:36 pm
Forum: Properties of Light
Topic: Chapter 1 Problem 7b
Replies: 3
Views: 155

Re: Chapter 1 Problem 7b

I had the same question, thanks for clarifying!

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