Search found 50 matches

by Troy Tavangar 1I
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: 198

Re: Solve for Q

It is the concentrations of the products divided by the concentration of the reactants
by Troy Tavangar 1I
Sun Mar 18, 2018 1:20 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: total entropy of the system
Replies: 3
Views: 219

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
by Troy Tavangar 1I
Sun Mar 18, 2018 1:16 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated Systems
Replies: 3
Views: 229

Re: Isolated Systems

Yes.
by Troy Tavangar 1I
Sun Mar 18, 2018 1:15 am
Forum: Calculating Work of Expansion
Topic: What w equation to use
Replies: 5
Views: 355

Re: What w equation to use

The first is for irreversible and the second is for reversible.
by Troy Tavangar 1I
Sun Mar 18, 2018 1:13 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Spontaneity question
Replies: 7
Views: 331

Re: Spontaneity question

Since deltaH and the temperature affect spontaneity, you must find Gibbs to find if it is spontaneous.
by Troy Tavangar 1I
Sun Mar 18, 2018 1:12 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Cp & Cv?
Replies: 3
Views: 262

Re: Cp & Cv?

No, the pressure in a bomb calorimeter is subject to change.
by Troy Tavangar 1I
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: 261

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.
by Troy Tavangar 1I
Sun Mar 18, 2018 1:10 am
Forum: Phase Changes & Related Calculations
Topic: Constant Volume
Replies: 3
Views: 220

Re: Constant Volume

Yes!
by Troy Tavangar 1I
Sun Mar 18, 2018 1:07 am
Forum: Calculating Work of Expansion
Topic: work done on and by the system
Replies: 12
Views: 513

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.
by Troy Tavangar 1I
Sun Mar 18, 2018 1:05 am
Forum: Calculating Work of Expansion
Topic: irreversible reactions
Replies: 4
Views: 288

Re: irreversible reactions

A reversible reaction occurs at equilibrium while an irreversible reaction does not.
by Troy Tavangar 1I
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: 313

Re: how to find a microstate

I also believe he should provide the number of micro states if solving for W.
by Troy Tavangar 1I
Sun Mar 18, 2018 12:55 am
Forum: Balancing Redox Reactions
Topic: determining cathode from anode
Replies: 11
Views: 443

Re: determining cathode from anode

The one with the greater cell potential is the cathode.
by Troy Tavangar 1I
Sun Mar 18, 2018 12:54 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: 9.5
Replies: 4
Views: 236

Re: 9.5

It is because the first reservoir is losing heat.
by Troy Tavangar 1I
Sun Mar 18, 2018 12:53 am
Forum: General Rate Laws
Topic: Units
Replies: 11
Views: 545

Re: Units

Since the units which you generally deal with are mols per liter per second, you probably should.
by Troy Tavangar 1I
Sun Mar 18, 2018 12:51 am
Forum: *Alkanes
Topic: Final
Replies: 13
Views: 998

Re: Final

Yes but only the portion which was covered class.
by Troy Tavangar 1I
Sun Mar 18, 2018 12:51 am
Forum: General Rate Laws
Topic: rate law
Replies: 6
Views: 469

Re: rate law

Rate law is not affected by products so no.
by Troy Tavangar 1I
Sun Mar 18, 2018 12:50 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Final
Replies: 3
Views: 211

Re: Final

That should be all since that is the extent of what he covered in class.
by Troy Tavangar 1I
Sun Mar 18, 2018 12:48 am
Forum: Calculating Work of Expansion
Topic: Work Equations: Which One to Use?
Replies: 3
Views: 244

Re: Work Equations: Which One to Use?

The first is for irreversible reactions and the latter is for reversible reactions.
by Troy Tavangar 1I
Sun Mar 18, 2018 12:47 am
Forum: Calculating Work of Expansion
Topic: Work done on or by system
Replies: 2
Views: 210

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.
by Troy Tavangar 1I
Sun Mar 18, 2018 12:41 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated systems
Replies: 3
Views: 271

Re: Isolated systems

Yes the volume in an isolated system doesn't change.
by Troy Tavangar 1I
Sat Mar 17, 2018 5:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Organic Chem
Replies: 2
Views: 234

Organic Chem

Does anyone know if any organic chemistry will be covered on the final?
by Troy Tavangar 1I
Sat Mar 17, 2018 5:18 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: State functions?
Replies: 9
Views: 381

Re: State functions?

Both are classified as state functions. Gibbs Free Energy is also a state function.
by Troy Tavangar 1I
Sat Mar 17, 2018 5:16 pm
Forum: Calculating Work of Expansion
Topic: Free energy and work
Replies: 3
Views: 202

Re: Free energy and work

It is the most work that can be done.
by Troy Tavangar 1I
Sat Mar 17, 2018 5:15 pm
Forum: Administrative Questions and Class Announcements
Topic: FINAL
Replies: 9
Views: 555

Re: FINAL

Pretty sure all material covered in class should be on final.
by Troy Tavangar 1I
Sat Mar 17, 2018 5:14 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: First Law Thermo
Replies: 4
Views: 237

Re: First Law Thermo

No, the first law involves work and is deltaU= q +w
by Troy Tavangar 1I
Sat Mar 17, 2018 5:11 pm
Forum: Student Social/Study Group
Topic: Final Review Time Tips
Replies: 5
Views: 376

Re: Final Review Time Tips

I find reviewing old tests as well as going over past homework excercises to be the most helpful.
by Troy Tavangar 1I
Sat Mar 17, 2018 5:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Test Grading
Replies: 4
Views: 328

Re: Test Grading

I don't believe he ever mentioned that.
by Troy Tavangar 1I
Sat Mar 17, 2018 5:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Topics
Replies: 3
Views: 204

Re: Final Topics

Pretty sure it is cumulative and will cover all topics according to his website.
by Troy Tavangar 1I
Thu Dec 07, 2017 11:47 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Dipole Moments
Replies: 2
Views: 148

Re: Dipole Moments

Pay attention to the electronegativity. A greater electronegativity means a greater dipole moment.
by Troy Tavangar 1I
Thu Dec 07, 2017 11:46 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and pi
Replies: 12
Views: 599

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.
by Troy Tavangar 1I
Thu Dec 07, 2017 11:43 pm
Forum: Naming
Topic: Finding Coordination Number
Replies: 6
Views: 290

Re: Finding Coordination Number

It is simply the number of molecules attached to the main element.
by Troy Tavangar 1I
Thu Dec 07, 2017 11:41 pm
Forum: Conjugate Acids & Bases
Topic: Chemical Formula
Replies: 5
Views: 281

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.
by Troy Tavangar 1I
Thu Dec 07, 2017 11:39 pm
Forum: Naming
Topic: Order of Ligands
Replies: 8
Views: 356

Re: Order of Ligands

When writing them, they must be in alphabetical order.
by Troy Tavangar 1I
Thu Dec 07, 2017 11:38 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: drawing coordination compounds
Replies: 5
Views: 235

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.
by Troy Tavangar 1I
Thu Dec 07, 2017 11:37 pm
Forum: Hybridization
Topic: Do pi bonds only form with double/triple bonds?
Replies: 5
Views: 293

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.
by Troy Tavangar 1I
Thu Dec 07, 2017 11:35 pm
Forum: Lewis Acids & Bases
Topic: Identifying Lewis Acid
Replies: 3
Views: 189

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.
by Troy Tavangar 1I
Thu Dec 07, 2017 11:32 pm
Forum: Properties of Light
Topic: Amplitude
Replies: 6
Views: 393

Re: Amplitude

Amplitude has no relation ship with the frequency or wavelength
by Troy Tavangar 1I
Thu Dec 07, 2017 11:30 pm
Forum: Properties of Light
Topic: Velocity [ENDORSED]
Replies: 13
Views: 646

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.
by Troy Tavangar 1I
Thu Dec 07, 2017 11:28 pm
Forum: Properties of Light
Topic: Amplitude properties
Replies: 4
Views: 296

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.
by Troy Tavangar 1I
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: 143

Re: Reaction shift

The reaction will shift towards the Reactants in order to maintain equilibrium. In other words, the reaction should shift left.
by Troy Tavangar 1I
Thu Dec 07, 2017 11:06 pm
Forum: Dipole Moments
Topic: How is SiO2 polar?
Replies: 3
Views: 387

Re: How is SiO2 polar?

SiO2 should be nonpolar I believe. Are you thinking of SO2 which is polar?
by Troy Tavangar 1I
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: 174

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.
by Troy Tavangar 1I
Thu Dec 07, 2017 10:56 pm
Forum: Bronsted Acids & Bases
Topic: identifying based on structure
Replies: 4
Views: 210

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.

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