Search found 50 matches
- Sun Mar 18, 2018 1:22 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Potential sign
- Replies: 4
- Views: 338
- Sun Mar 18, 2018 1:21 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Solve for Q
- Replies: 2
- Views: 260
Re: Solve for Q
It is the concentrations of the products divided by the concentration of the reactants
- Sun Mar 18, 2018 1:20 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: total entropy of the system
- Replies: 3
- Views: 285
Re: total entropy of the system
The second law only says that the entropy can never decrease which is why entropy itself is never negative
- Sun Mar 18, 2018 1:16 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Isolated Systems
- Replies: 3
- Views: 307
Re: Isolated Systems
Yes.
- Sun Mar 18, 2018 1:15 am
- Forum: Calculating Work of Expansion
- Topic: What w equation to use
- Replies: 5
- Views: 822
Re: What w equation to use
The first is for irreversible and the second is for reversible.
- Sun Mar 18, 2018 1:13 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Spontaneity question
- Replies: 7
- Views: 478
Re: Spontaneity question
Since deltaH and the temperature affect spontaneity, you must find Gibbs to find if it is spontaneous.
- Sun Mar 18, 2018 1:12 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Cp & Cv?
- Replies: 3
- Views: 392
Re: Cp & Cv?
No, the pressure in a bomb calorimeter is subject to change.
- Sun Mar 18, 2018 1:11 am
- Forum: General Rate Laws
- Topic: Rate Law where a concentration is to a negative power
- Replies: 2
- Views: 302
Re: Rate Law where a concentration is to a negative power
It is like an inhibitor since it brings it underneath and makes value decrease.
- Sun Mar 18, 2018 1:10 am
- Forum: Phase Changes & Related Calculations
- Topic: Constant Volume
- Replies: 3
- Views: 272
Re: Constant Volume
Yes!
- Sun Mar 18, 2018 1:08 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: When to include an inert electrode such as Pt(s)
- Replies: 2
- Views: 255
Re: When to include an inert electrode such as Pt(s)
You only include it when there is no solid (metal) involved.
- Sun Mar 18, 2018 1:07 am
- Forum: Calculating Work of Expansion
- Topic: work done on and by the system
- Replies: 12
- Views: 725
Re: work done on and by the system
When w is negative, work is by the system whereas when work is positive, work is done on the system.
- Sun Mar 18, 2018 1:05 am
- Forum: Calculating Work of Expansion
- Topic: irreversible reactions
- Replies: 4
- Views: 378
Re: irreversible reactions
A reversible reaction occurs at equilibrium while an irreversible reaction does not.
- Sun Mar 18, 2018 1:00 am
- 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: how to find a microstate
- Replies: 2
- Views: 481
Re: how to find a microstate
I also believe he should provide the number of micro states if solving for W.
- Sun Mar 18, 2018 12:58 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Concept of Second Law of Thermodynamics
- Replies: 6
- Views: 515
Re: Concept of Second Law of Thermodynamics
The entropy is always increasing.
- Sun Mar 18, 2018 12:57 am
- 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: what does W stand for in S=klnW
- Replies: 3
- Views: 2682
Re: what does W stand for in S=klnW
It is the degeneracy.
- Sun Mar 18, 2018 12:55 am
- Forum: Balancing Redox Reactions
- Topic: determining cathode from anode
- Replies: 11
- Views: 706
Re: determining cathode from anode
The one with the greater cell potential is the cathode.
- Sun Mar 18, 2018 12:54 am
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: 9.5
- Replies: 4
- Views: 352
Re: 9.5
It is because the first reservoir is losing heat.
- Sun Mar 18, 2018 12:53 am
- Forum: General Rate Laws
- Topic: Units
- Replies: 11
- Views: 777
Re: Units
Since the units which you generally deal with are mols per liter per second, you probably should.
Re: Final
Yes but only the portion which was covered class.
- Sun Mar 18, 2018 12:51 am
- Forum: General Rate Laws
- Topic: rate law
- Replies: 6
- Views: 628
Re: rate law
Rate law is not affected by products so no.
- Sun Mar 18, 2018 12:50 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Final
- Replies: 3
- Views: 283
Re: Final
That should be all since that is the extent of what he covered in class.
- Sun Mar 18, 2018 12:48 am
- Forum: Calculating Work of Expansion
- Topic: Work Equations: Which One to Use?
- Replies: 3
- Views: 332
Re: Work Equations: Which One to Use?
The first is for irreversible reactions and the latter is for reversible reactions.
- Sun Mar 18, 2018 12:47 am
- Forum: Calculating Work of Expansion
- Topic: Work done on or by system
- Replies: 2
- Views: 271
Re: Work done on or by system
If work is negative, it is done by the system. If work is positive, work is done on the system.
- Sun Mar 18, 2018 12:41 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Isolated systems
- Replies: 3
- Views: 383
Re: Isolated systems
Yes the volume in an isolated system doesn't change.
- Sat Mar 17, 2018 5:51 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Organic Chem
- Replies: 2
- Views: 309
Organic Chem
Does anyone know if any organic chemistry will be covered on the final?
- Sat Mar 17, 2018 5:18 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: State functions?
- Replies: 9
- Views: 601
Re: State functions?
Both are classified as state functions. Gibbs Free Energy is also a state function.
- Sat Mar 17, 2018 5:16 pm
- Forum: Calculating Work of Expansion
- Topic: Free energy and work
- Replies: 3
- Views: 263
Re: Free energy and work
It is the most work that can be done.
- Sat Mar 17, 2018 5:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL
- Replies: 9
- Views: 742
Re: FINAL
Pretty sure all material covered in class should be on final.
- Sat Mar 17, 2018 5:14 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: First Law Thermo
- Replies: 4
- Views: 357
Re: First Law Thermo
No, the first law involves work and is deltaU= q +w
- Sat Mar 17, 2018 5:12 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: S=klnW
- Replies: 7
- Views: 1543
Re: S=klnW
This is used for finding total entropy.
- Sat Mar 17, 2018 5:11 pm
- Forum: Student Social/Study Group
- Topic: Final Review Time Tips
- Replies: 5
- Views: 523
Re: Final Review Time Tips
I find reviewing old tests as well as going over past homework excercises to be the most helpful.
- Sat Mar 17, 2018 5:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test Grading
- Replies: 4
- Views: 469
Re: Test Grading
I don't believe he ever mentioned that.
- Sat Mar 17, 2018 5:08 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Topics
- Replies: 3
- Views: 275
Re: Final Topics
Pretty sure it is cumulative and will cover all topics according to his website.
- Sat Mar 17, 2018 5:07 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Class Study Google Doc
- Replies: 5
- Views: 546
Re: Class Study Google Doc
Thank you!
- Sat Mar 17, 2018 5:05 pm
- Forum: Phase Changes & Related Calculations
- Topic: Correct Answer For Test 1 Question 7
- Replies: 4
- Views: 424
Re: Correct Answer For Test 1 Question 7
Yes that is correct.
- Thu Dec 07, 2017 11:47 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Dipole Moments
- Replies: 2
- Views: 240
Re: Dipole Moments
Pay attention to the electronegativity. A greater electronegativity means a greater dipole moment.
- Thu Dec 07, 2017 11:46 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma and pi
- Replies: 12
- Views: 878
Re: Sigma and pi
Yes, the first bond is always a sigma bond and each additional bond is a pi bond. For example, a triple bond would contain 1 sigma bond and 2 pi bonds.
- Thu Dec 07, 2017 11:43 pm
- Forum: Naming
- Topic: Finding Coordination Number
- Replies: 6
- Views: 452
Re: Finding Coordination Number
It is simply the number of molecules attached to the main element.
- Thu Dec 07, 2017 11:41 pm
- Forum: Conjugate Acids & Bases
- Topic: Chemical Formula
- Replies: 5
- Views: 400
Re: Chemical Formula
Generally, if the molecule contains a nonmetal, it is an acid. Inversely, if the molecule contains a metal, it is generally a base.
- Thu Dec 07, 2017 11:39 pm
- Forum: Naming
- Topic: Order of Ligands
- Replies: 8
- Views: 500
Re: Order of Ligands
When writing them, they must be in alphabetical order.
- Thu Dec 07, 2017 11:38 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: drawing coordination compounds
- Replies: 5
- Views: 370
Re: drawing coordination compounds
I don't believe it is necessary to draw the charge but rather the overall charge on the compound as a whole.
- Thu Dec 07, 2017 11:37 pm
- Forum: Hybridization
- Topic: Do pi bonds only form with double/triple bonds?
- Replies: 5
- Views: 426
Re: Do pi bonds only form with double/triple bonds?
Yes, Pi bonds are always the second and third bonds while the first bond or a single bond is always the sigma bond. There is always one sigma bond and every bond in addition is a pi bond.
- Thu Dec 07, 2017 11:35 pm
- Forum: Lewis Acids & Bases
- Topic: Identifying Lewis Acid
- Replies: 3
- Views: 319
Re: Identifying Lewis Acid
When going from the written form to the formula, it could get confusing due to the fact that transition metals have various oxidation states and this could affect the formula if not known.
- Thu Dec 07, 2017 11:32 pm
- Forum: Properties of Light
- Topic: Amplitude
- Replies: 6
- Views: 539
Re: Amplitude
Amplitude has no relation ship with the frequency or wavelength
- Thu Dec 07, 2017 11:30 pm
- Forum: Properties of Light
- Topic: Velocity [ENDORSED]
- Replies: 13
- Views: 957
Re: Velocity [ENDORSED]
Velocity affects direction while speed disregards direction all together. For example, 10 mph west is a velocity while 10 mph is speed.
- Thu Dec 07, 2017 11:28 pm
- Forum: Properties of Light
- Topic: Amplitude properties
- Replies: 4
- Views: 442
Re: Amplitude properties
Amplitude has no relationship with either the frequency or the wavelength, however, the wavelength and the frequency have an opposite relationship in the way that if one increases, the other decreases and vice versa.
- Thu Dec 07, 2017 11:09 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Reaction shift
- Replies: 3
- Views: 176
Re: Reaction shift
The reaction will shift towards the Reactants in order to maintain equilibrium. In other words, the reaction should shift left.
- Thu Dec 07, 2017 11:06 pm
- Forum: Dipole Moments
- Topic: How is SiO2 polar?
- Replies: 3
- Views: 759
Re: How is SiO2 polar?
SiO2 should be nonpolar I believe. Are you thinking of SO2 which is polar?
- Thu Dec 07, 2017 10:59 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Inert Gas
- Replies: 2
- Views: 331
Re: Inert Gas
I believe the volume will increase however the inert gas should not affect the equilibrium because what matters for the equilibrium are the partial pressures of the reactants and products.
- Thu Dec 07, 2017 10:56 pm
- Forum: Bronsted Acids & Bases
- Topic: identifying based on structure
- Replies: 4
- Views: 306
Re: identifying based on structure
Acids have the ability to take on an extra electron while bases have the ability to give an extra, therefore Ag+ would be the acid cause it requires an electron to have a neutral charge and F- is a base because it needs to get rid of an electron to have a neutral charge.