Search found 38 matches

by Jennifer Guzman 4C
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: 88

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
by Jennifer Guzman 4C
Sun Feb 03, 2019 2:39 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Gas vs solid
Replies: 5
Views: 92

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?
by Jennifer Guzman 4C
Sun Feb 03, 2019 1:58 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Clarification on Gibbs
Replies: 2
Views: 78

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?
by Jennifer Guzman 4C
Sun Jan 27, 2019 3:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pKa values
Replies: 3
Views: 71

pKa values

Where can I find an index of pKa values?
by Jennifer Guzman 4C
Sun Jan 27, 2019 2:58 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy Concept
Replies: 1
Views: 67

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.
by Jennifer Guzman 4C
Sun Jan 27, 2019 2:56 pm
Forum: Calculating Work of Expansion
Topic: WORK
Replies: 1
Views: 72

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...
by Jennifer Guzman 4C
Wed Jan 09, 2019 1:07 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE Tables
Replies: 3
Views: 97

ICE Tables

Can someone explain how to use ICE Tables or possibly post a link to a video that explains it? Thank you!
by Jennifer Guzman 4C
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: 76

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?
by Jennifer Guzman 4C
Wed Jan 09, 2019 1:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Favoring Products/Reactants
Replies: 3
Views: 65

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 ?
by Jennifer Guzman 4C
Sun Dec 09, 2018 10:04 am
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Final Exam
Replies: 8
Views: 888

Re: Final Exam

Pka is a measure of how much acid dissociates
by Jennifer Guzman 4C
Fri Dec 07, 2018 8:16 pm
Forum: General Science Questions
Topic: Finals
Replies: 4
Views: 318

Re: Finals

i know we briefly went over MO diagrams, but does anyone know if we'll be tested on them?
by Jennifer Guzman 4C
Fri Dec 07, 2018 8:15 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Final Exam
Replies: 3
Views: 105

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...
by Jennifer Guzman 4C
Fri Dec 07, 2018 12:46 am
Forum: Administrative Questions and Class Announcements
Topic: Lavelle's review
Replies: 1
Views: 100

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?
by Jennifer Guzman 4C
Wed Nov 28, 2018 11:28 am
Forum: Student Social/Study Group
Topic: Final
Replies: 12
Views: 604

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
by Jennifer Guzman 4C
Sun Nov 25, 2018 9:01 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: MO theory
Replies: 2
Views: 104

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?
by Jennifer Guzman 4C
Sun Nov 25, 2018 8:58 pm
Forum: Hybridization
Topic: orbital hybridization and polarity
Replies: 1
Views: 66

orbital hybridization and polarity

Is there a trick for finding out orbital hybridization and polarity if you know the molecular shape?
by Jennifer Guzman 4C
Fri Nov 23, 2018 2:12 pm
Forum: Lewis Structures
Topic: Homework #4.13 (C)
Replies: 2
Views: 92

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
by Jennifer Guzman 4C
Sun Nov 11, 2018 11:20 pm
Forum: Electronegativity
Topic: ChemistryHow are electronegativity values for elements determined?
Replies: 3
Views: 84

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?
by Jennifer Guzman 4C
Sun Nov 11, 2018 11:17 pm
Forum: Lewis Structures
Topic: VSEPR theory
Replies: 1
Views: 66

VSEPR theory

according to VSEPR theory, lone pair- lone pair repulsion is greater than bonding-pair repulsion. Why is this?
by Jennifer Guzman 4C
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: 316

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?
by Jennifer Guzman 4C
Thu Nov 01, 2018 3:14 pm
Forum: Administrative Questions and Class Announcements
Topic: Questions on Midterm
Replies: 4
Views: 143

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
by Jennifer Guzman 4C
Thu Nov 01, 2018 3:10 pm
Forum: Lewis Structures
Topic: Central Atom
Replies: 13
Views: 229

Re: Central Atom

The least electronegative atom will be central. Hydrogen is never central.
by Jennifer Guzman 4C
Thu Nov 01, 2018 3:07 pm
Forum: Bond Lengths & Energies
Topic: Bond Strength and Resonance
Replies: 2
Views: 134

Re: Bond Strength and Resonance

Why can we only have up to triple bonds?
by Jennifer Guzman 4C
Tue Oct 23, 2018 2:36 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energies
Replies: 3
Views: 114

Ionization Energies

Can someone explain the difference between the first ionization energy and the second ionization energy please ? Thank you!!
by Jennifer Guzman 4C
Mon Oct 22, 2018 2:19 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Topics discussed in today's lecture
Replies: 3
Views: 54

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 !
by Jennifer Guzman 4C
Sun Oct 21, 2018 7:33 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Equation
Replies: 6
Views: 168

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
by Jennifer Guzman 4C
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: 92

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?
by Jennifer Guzman 4C
Thu Oct 18, 2018 7:06 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Video Modules
Replies: 7
Views: 155

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?
by Jennifer Guzman 4C
Mon Oct 15, 2018 8:04 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Textbook pages
Replies: 3
Views: 115

Re: Textbook pages

Thank you so much!!! <3
by Jennifer Guzman 4C
Mon Oct 15, 2018 7:54 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Textbook pages
Replies: 3
Views: 115

Textbook pages

Can anyone inform me of the textbook pages we covered in today's lecture revolving around Quantum mechanics? Thank you!!!
by Jennifer Guzman 4C
Sun Oct 14, 2018 4:06 pm
Forum: SI Units, Unit Conversions
Topic: Unit Conversions
Replies: 3
Views: 184

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!
by Jennifer Guzman 4C
Thu Oct 11, 2018 2:05 pm
Forum: Properties of Light
Topic: frequency and electrical field
Replies: 1
Views: 54

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!
by Jennifer Guzman 4C
Tue Oct 09, 2018 7:41 pm
Forum: Properties of Light
Topic: Balmer series vs Lyman series
Replies: 4
Views: 87

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!
by Jennifer Guzman 4C
Thu Oct 04, 2018 1:50 pm
Forum: Molarity, Solutions, Dilutions
Topic: Atomic Weight, Molecular Weight, Formula Weight [ENDORSED]
Replies: 2
Views: 87

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?
by Jennifer Guzman 4C
Wed Oct 03, 2018 3:00 pm
Forum: Molarity, Solutions, Dilutions
Topic: Coefficients and Subscripts
Replies: 4
Views: 112

Coefficients and Subscripts

Hi all! Can someone explain to me why we only multiply Stoichiometric coefficients and not also the subscript. Much appreciated, thanks!
by Jennifer Guzman 4C
Tue Oct 02, 2018 6:57 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: number of moles, molecules, and formula units?
Replies: 3
Views: 79

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!
by Jennifer Guzman 4C
Wed Apr 18, 2018 8:20 pm
Forum: Photoelectric Effect
Topic: Chapter 1 HW problem 33
Replies: 1
Views: 99

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...

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