Search found 38 matches
- Sun Feb 03, 2019 3:00 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Midterm Exam Content
- Replies: 4
- Views: 427
Re: Midterm Exam Content
I would suggest going through the outlines Lavelle has on his website and reading the bullet points for an even more in depth understanding on what you should know
- Sun Feb 03, 2019 2:39 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Gas vs solid
- Replies: 5
- Views: 522
Gas vs solid
Why is the entropy of a gas in an aqueous solution less than the entropy of a solid in an aquesous solution?
- Sun Feb 03, 2019 1:58 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Clarification on Gibbs
- Replies: 2
- Views: 333
Clarification on Gibbs
why can some energy not be lost? Is the energy represented by H the energy within the bonds? Which part of that equation accounts for the attractive/repulsive forces between the molecules?
- Sun Jan 27, 2019 3:29 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pKa values
- Replies: 3
- Views: 471
pKa values
Where can I find an index of pKa values?
- Sun Jan 27, 2019 2:58 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs Free Energy Concept
- Replies: 1
- Views: 267
Gibbs Free Energy Concept
is Gibbs free energy literally the useable energy of a system, or is it just arbitrarily called Gibbs Free Energy? When free energy is released, what does it do? I understand that if it is "absorbed," it is made into chemical potential energy.
- Sun Jan 27, 2019 2:56 pm
- Forum: Calculating Work of Expansion
- Topic: WORK
- Replies: 1
- Views: 265
WORK
Basically, the first law of thermodynamics emphasizes that heat exchange (q) between the system and the surroundings added to the work (w) done on (or by) the system results to the change in the internal energy (change in U) of a system. How exactly is “work” defined in this equation? How can work b...
- Wed Jan 09, 2019 1:07 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE Tables
- Replies: 3
- Views: 630
ICE Tables
Can someone explain how to use ICE Tables or possibly post a link to a video that explains it? Thank you!
- Wed Jan 09, 2019 1:04 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: What does it mean when a reaction is at equilibrium?
- Replies: 4
- Views: 457
What does it mean when a reaction is at equilibrium?
What I have is far is concentrations will not change, rates forward/back are equal, and rate constants are not. Is there anything else that I am missing? Is there no net change as well?
- Wed Jan 09, 2019 1:01 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Favoring Products/Reactants
- Replies: 3
- Views: 421
Favoring Products/Reactants
What does it mean when equilibrium favors either the products or reactants and what is the significance of a side being favored ?
- Sun Dec 09, 2018 10:04 am
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: Final Exam
- Replies: 8
- Views: 2435
Re: Final Exam
Pka is a measure of how much acid dissociates
- Fri Dec 07, 2018 8:16 pm
- Forum: General Science Questions
- Topic: Finals
- Replies: 4
- Views: 744
Re: Finals
i know we briefly went over MO diagrams, but does anyone know if we'll be tested on them?
- Fri Dec 07, 2018 8:15 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Final Exam
- Replies: 3
- Views: 419
Re: Final Exam
according to the outline, we need to know (structure and properties of inorganic, organic, and biological acids and bases; amphoteric compounds; Bronsted and Lewis acids and bases; conjugate acids and bases; polyprotic acids and bases; pH scale; pH calculations involving strong acids and bases; cati...
- Fri Dec 07, 2018 12:46 am
- Forum: Administrative Questions and Class Announcements
- Topic: Lavelle's review
- Replies: 1
- Views: 298
Lavelle's review
Does anyone know if Lavelle will be going through different exam questions in each of his review sessions or will he stick to the same ones?
- Wed Nov 28, 2018 11:28 am
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 12
- Views: 1747
Re: Final
I believe it's mostly on the new stuff we're learning in class like ligands and acids and bases so I would focus on that
- Sun Nov 25, 2018 9:01 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: MO theory
- Replies: 2
- Views: 338
MO theory
Hello everyone, I don't fully understand how to figure out the electron configuration in MO theory, especially what order to fill the orbitals, when and orbital is bonding or antibonding and how to calculate bond order. Does anyone have a super simple explanation?
- Sun Nov 25, 2018 8:58 pm
- Forum: Hybridization
- Topic: orbital hybridization and polarity
- Replies: 1
- Views: 450
orbital hybridization and polarity
Is there a trick for finding out orbital hybridization and polarity if you know the molecular shape?
- Fri Nov 23, 2018 2:12 pm
- Forum: Lewis Structures
- Topic: Homework #4.13 (C)
- Replies: 2
- Views: 356
Homework #4.13 (C)
According to the answer in the textbook, Iodine forms a single bond with oxygen. My question is why can't Iodine form double bonds with all three oxygen molecules? In the end, I still managed to have a VSEPR of Ax3E with a trigonal pyramid shape, less than 109.5
- Sun Nov 11, 2018 11:20 pm
- Forum: Electronegativity
- Topic: ChemistryHow are electronegativity values for elements determined?
- Replies: 3
- Views: 414
ChemistryHow are electronegativity values for elements determined?
I understand that electronegativity is the tendency for elements to attract electrons, but I was wondering how the specific values for each element is calculated?
- Sun Nov 11, 2018 11:17 pm
- Forum: Lewis Structures
- Topic: VSEPR theory
- Replies: 1
- Views: 254
VSEPR theory
according to VSEPR theory, lone pair- lone pair repulsion is greater than bonding-pair repulsion. Why is this?
- Sun Nov 11, 2018 11:12 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Why do the orbitals of an atom only hold a certain amount of electrons?
- Replies: 7
- Views: 1071
Why do the orbitals of an atom only hold a certain amount of electrons?
we know that orbitals are given by s, p, d, and f subshells, and we know that each of these can hold 2, 6, 10, and 14 electrons, respectively. But where do those numbers come from?
- Thu Nov 01, 2018 3:14 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Questions on Midterm
- Replies: 4
- Views: 461
Re: Questions on Midterm
I'm not sure if the test bank at the student's activities center has any of his old exams but you can try looking there
- Thu Nov 01, 2018 3:10 pm
- Forum: Lewis Structures
- Topic: Central Atom
- Replies: 13
- Views: 937
Re: Central Atom
The least electronegative atom will be central. Hydrogen is never central.
- Thu Nov 01, 2018 3:07 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Strength and Resonance
- Replies: 2
- Views: 385
Re: Bond Strength and Resonance
Why can we only have up to triple bonds?
- Tue Oct 23, 2018 2:36 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energies
- Replies: 3
- Views: 471
Ionization Energies
Can someone explain the difference between the first ionization energy and the second ionization energy please ? Thank you!!
- Mon Oct 22, 2018 2:53 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Topics discussed in today's lecture
- Replies: 3
- Views: 288
Re: Topics discussed in today's lecture
Thank you so much!
- Mon Oct 22, 2018 2:19 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Topics discussed in today's lecture
- Replies: 3
- Views: 288
Topics discussed in today's lecture
Hi all!
I woke up extremely sick this morning and missed today's lecture. Could someone please inform me about the topics that were discussed or the pages we went over from the sixth edition. It would be extremely appreciated. Thank you !
I woke up extremely sick this morning and missed today's lecture. Could someone please inform me about the topics that were discussed or the pages we went over from the sixth edition. It would be extremely appreciated. Thank you !
- Sun Oct 21, 2018 7:33 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Equation
- Replies: 6
- Views: 690
Re: Equation
Layla Manoochehri wrote:im confused, is it h/4π or is it h(bar)/2? or are they the same thing?
From my understanding, They are the same thing but most physic majors tend to use h(bar)/2
- Sun Oct 21, 2018 7:24 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Finding an electron at a certain location
- Replies: 2
- Views: 274
Finding an electron at a certain location
Are we suppose to know how to calculate the probability of finding an electron at a certain location?
- Thu Oct 18, 2018 7:06 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Video Modules
- Replies: 7
- Views: 764
Video Modules
Does anyone know if the video modules end on Heisenberg's uncertainty principle or is there a different link that will give me a second set of video modules for the upcoming chapters?
- Mon Oct 15, 2018 8:04 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Textbook pages
- Replies: 3
- Views: 363
Re: Textbook pages
Thank you so much!!! <3
- Mon Oct 15, 2018 7:54 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Textbook pages
- Replies: 3
- Views: 363
Textbook pages
Can anyone inform me of the textbook pages we covered in today's lecture revolving around Quantum mechanics? Thank you!!!
- Sun Oct 14, 2018 4:06 pm
- Forum: SI Units, Unit Conversions
- Topic: Unit Conversions
- Replies: 3
- Views: 513
Unit Conversions
Does anyone have an easy way to memorize all the SI units? Or at least any tips for memorizing them? It would be much appreciated, thanks!
- Thu Oct 11, 2018 2:05 pm
- Forum: Properties of Light
- Topic: frequency and electrical field
- Replies: 1
- Views: 123
frequency and electrical field
Hi all!
can someone please clarify the relationship between frequency and the change in the electrical field because I'm still a little confused about it.
Thanks!
can someone please clarify the relationship between frequency and the change in the electrical field because I'm still a little confused about it.
Thanks!
- Tue Oct 09, 2018 7:41 pm
- Forum: Properties of Light
- Topic: Balmer series vs Lyman series
- Replies: 4
- Views: 234
Balmer series vs Lyman series
Can someone explain to me when to use the Balmer series and when to use the Lyman series as the textbook doesn't necessarily specify. Thanks!
- Thu Oct 04, 2018 1:50 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Atomic Weight, Molecular Weight, Formula Weight [ENDORSED]
- Replies: 2
- Views: 267
Atomic Weight, Molecular Weight, Formula Weight [ENDORSED]
I noticed the only difference between atomic weight, molecular weight, and formula weight is wether it was an element, molecular compound, or ionic compound but is there any other difference between atomic weight, molecular weight, and formula weight? or are they basically the same thing?
- Wed Oct 03, 2018 3:00 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Coefficients and Subscripts
- Replies: 4
- Views: 1647
Coefficients and Subscripts
Hi all! Can someone explain to me why we only multiply Stoichiometric coefficients and not also the subscript. Much appreciated, thanks!
- Tue Oct 02, 2018 6:57 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: number of moles, molecules, and formula units?
- Replies: 3
- Views: 391
number of moles, molecules, and formula units?
can someone explain to me the difference between number of moles, molecules, and formula units? I’m a bit confused. Thank you!
- Wed Apr 18, 2018 8:20 pm
- Forum: Photoelectric Effect
- Topic: Chapter 1 HW problem 33
- Replies: 1
- Views: 182
Chapter 1 HW problem 33
The problem gives the velocity of an electron emitted from a metallic surface by a photon (3.6x10^3 km/s). Part A asks for the wavelength of the ejected electron. I used the formula for calculating wavelength, Wavelength= h/m*v, in which m= 9.109x10^31 and v = 3.6x10^3. Is this the correct first ste...