Search found 108 matches
- Fri Mar 13, 2020 10:59 am
- Forum: Student Social/Study Group
- Topic: notes
- Replies: 1
- Views: 302
Re: notes
I can! Message me on GroupMe!!! Kallie Beltrami is my name to search
- Fri Mar 13, 2020 10:14 am
- Forum: Administrative Questions and Class Announcements
- Topic: Final Topics
- Replies: 10
- Views: 819
Re: Final Topics
kendal mccarthy wrote:I am just going to put together a comprehensive study guide with a ton of example problems from outlines 1-6.
me too, probably with the equations and when they are useful, as well as side notes to remember when working through word problems
- Fri Mar 13, 2020 10:13 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 6.57
- Replies: 1
- Views: 218
Re: 6.57
Parker Smith wrote:I'm having trouble understanding the half reactions of question 6.57. How do I derive the second half reaction from the first half reaction the problem gives?
Not sure, hoping to see the answer.
- Fri Mar 13, 2020 10:11 am
- Forum: General Science Questions
- Topic: Chemistry Final
- Replies: 2
- Views: 370
Re: Chemistry Final
Because there hasn't been exhaustive coverage on thermo on any of the tests, I expect a decent amount of problems for that, as well as kinetics for sure, calorimetry and electrochemistry, and also equilibria. Maybe a thorough multi-part question on each.
- Fri Mar 13, 2020 10:09 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Steady State
- Replies: 2
- Views: 206
Re: Steady State
yes most likely
- Fri Mar 13, 2020 10:09 am
- Forum: Zero Order Reactions
- Topic: All reactants zero order?
- Replies: 7
- Views: 591
Re: All reactants zero order?
Leonardo Le Merle 1D wrote:Could there ever be a reaction in which all reactants are zero order and thus the reaction itself is zeroth order? What would be an example of this?
quoting in case an example comes up
- Fri Mar 13, 2020 10:06 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: How to make ICE box
- Replies: 17
- Views: 1222
Re: How to make ICE box
Unless you are given the precise change, you would just use x as an placeholder. For reactants, the change will be negative x, and for products the change will be positive x. Be sure to also account for the coefficients in the balanced chemical equation, if there is a coefficient of 2, then your ch...
- Fri Mar 13, 2020 10:05 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Closed Systems
- Replies: 14
- Views: 883
Re: Closed Systems
Eva Zhao 4I wrote:In a closed system, energy can be exchanged with surroundings, unlike an isolated system in which nothing can be exchanged with the surroundings. The energy of a closed system can be changed by heating/cooling or compression/expansion (i.e. compressing a piston).
very helpful!
- Fri Mar 13, 2020 10:04 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Free energy
- Replies: 6
- Views: 491
Re: Free energy
Standard free energy is measured in a lab under standard conditions (usually is denoted with a degree symbol). Delta G can be measured in a situation that isn't in standard conditions like in a biological system. So would we need to know anything more than just the sources of error/ comparison betw...
- Fri Mar 13, 2020 10:02 am
- Forum: Phase Changes & Related Calculations
- Topic: phase change
- Replies: 6
- Views: 516
Re: phase change
Like the diagram in class, you can tell that there is a phase change when the heat or enthalpy is increasing, but the temperature is not increasing, or delta T is zero. Can the enthalpy increase AND the temperature remains the same while there still not being a phase change? Like I'm imagining the ...
- Fri Mar 13, 2020 9:59 am
- Forum: Administrative Questions and Class Announcements
- Topic: "Open Book" Final?
- Replies: 30
- Views: 1952
Re: "Open Book" Final?
Brandi 2C wrote:I believe for "open book" it does entail classroom notes, office hour notes, discussion notes and packets, and everything in between.
What about -the internet-?
- Fri Mar 13, 2020 9:58 am
- Forum: Zero Order Reactions
- Topic: All reactants zero order?
- Replies: 7
- Views: 591
Re: All reactants zero order?
Michelle Song 1I wrote:Yes, it could happen if they all depend on the presence of a catalyst.
How so?
- Fri Mar 13, 2020 9:57 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Negative overall order
- Replies: 4
- Views: 581
Re: Negative overall order
Like first vs second order? Negative as in less than a zero order? What would that be called and can you give an example if you found a problem with it?
- Fri Mar 13, 2020 9:56 am
- Forum: Administrative Questions and Class Announcements
- Topic: Partial Credit
- Replies: 8
- Views: 528
Re: Partial Credit
Does anyone know how to scan from an at home wireless printer?
- Wed Feb 26, 2020 11:58 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Which one is Product? Cathode or Anode?
- Replies: 5
- Views: 451
Re: Which one is Product? Cathode or Anode?
I'm not 100% sure but I've only seen products where the cathode is the product, but I think that's because its dependent on the direction the electrodes are flowing. If the charge is increasing then the product will be that of a greater charge, right? In most cases it is the cathode, as far as I know.
- Wed Feb 26, 2020 10:44 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6M.1
- Replies: 5
- Views: 452
Re: 6M.1
Without seeing your calculations, chances are one of two things happened. Either you did E anode- Ecathode which is backwards (should be Ecathode-Eanode) or you just made a minor calculation error with the double negative. Since the anode has a negative value AND is being subtracted, it will become ...
- Wed Feb 26, 2020 10:35 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: log or ln
- Replies: 6
- Views: 475
log or ln
For the Nernst equation I've seen both ln and log used applied to Q and I'm confused as to which is correct or if they are used in different situations. Khan academy videos on Youtube seem to strictly use log but in lecture and discussion we've used ln.
- Wed Feb 26, 2020 10:33 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic vs. Concentration Cells
- Replies: 6
- Views: 438
Re: Galvanic vs. Concentration Cells
Galvanic cells are also typically separated by a salt bridge whereas concentration cells are separated by a porous wall. In addition, the Ecell is typically lower voltage in concentration cell because the reaction is only driven by the difference in concentrations between the anode and cathode reac...
- Tue Feb 11, 2020 6:56 pm
- Forum: Phase Changes & Related Calculations
- Topic: 4D.7
- Replies: 2
- Views: 264
Re: 4D.7
I believe that Lavelle mentioned that when it doesn't specifically state a temp, we typically assume its 25 degrees C which is 298K. However, I'm not sure if you need to know the temp for this problem.
- Mon Feb 10, 2020 10:11 pm
- Forum: Administrative Questions and Class Announcements
- Topic: memorizing things?
- Replies: 13
- Views: 585
Re: memorizing things?
do we need to know the standard formations for calculating delta H or will they be given to us if there is a question that requires them?
- Sun Feb 09, 2020 6:32 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: First Law
- Replies: 5
- Views: 359
Re: First Law
charleejohnson1L wrote:If we took that into consideration, we could never use measurements because they'd always be expanding or growing or something like that. Chem's a lot easier if you don't think super deep about it haha. :)
Thank you for responding!! This relieved a lot of my anxiety around the subject.
- Sun Feb 09, 2020 4:33 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Free energy
- Replies: 6
- Views: 491
Re: Free energy
Standard free energy is measured in a lab under standard conditions (usually is denoted with a degree symbol). Delta G can be measured in a situation that isn't in standard conditions like in a biological system. So would we need to know anything more than just the sources of error/ comparison betw...
- Sun Feb 09, 2020 4:30 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Calorimeter and Bomb Calorimeter
- Replies: 4
- Views: 414
Re: Calorimeter and Bomb Calorimeter
I don't know what exactly calorimeters are and I don't know what the differences are either. Can someone please explain how we're also going to use them in problems as well? There is a really good video on YouTube that may help you understand the concept: https://www.youtube.com/watch?v=nSh29lUGj00
- Sun Feb 09, 2020 4:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Review session powerpoints
- Replies: 4
- Views: 258
Re: Review session powerpoints
Elizabeth Bowen wrote:Does anyone know where we can find all the powerpoints from the review sessions (/if they're all posted)? Thanks!
Quoting this because I want to see the responses :)
- Sun Feb 09, 2020 4:26 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: change in entropy
- Replies: 3
- Views: 254
Re: change in entropy
Viviana Velasquez wrote:You can us delta H instead of q because at constant pressure, q(p)= delta H
What is the significance of this notation? Would we be marked down for using q?
- Sun Feb 09, 2020 4:23 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Intensive vs. extensive, state vs. non state
- Replies: 6
- Views: 231
Re: Intensive vs. extensive, state vs. non state
Hui Qiao Wu 1I wrote:I am not sure what you mean by intensive vs. extensive states but if you are referring to the intensive and extensive properties, they are:
Intensive
color, temperature, texture, density
Extensive
mass/weight, length, volume
Which section of the textbook is this in?
- Sun Feb 09, 2020 4:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: memorizing things?
- Replies: 13
- Views: 585
Re: memorizing things?
Anyone have good tips for organizing variables and memorizing which are used for different questions? This unit has very similar variables and similar equations and it's confusing.
- Fri Feb 07, 2020 3:56 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Constant pressure
- Replies: 19
- Views: 630
Re: Constant pressure
Is it always assumed to be 1 atm? What about in a vacuum?
- Fri Feb 07, 2020 3:55 pm
- Forum: Phase Changes & Related Calculations
- Topic: Negative Work
- Replies: 18
- Views: 1384
Re: Negative Work
In the homework problem 4B.7, the answer for work is -1626. However, I got 1626. When should I know to make work negative? I think you just need to know how much work is being done on the system, but I think that means that it was going from the Surroundings to the System vs the System to the Surro...
- Fri Feb 07, 2020 2:32 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: First Law
- Replies: 5
- Views: 359
First Law
I might be way over my head in this concept, but if the Universe is theoretically constantly expanding, how can we say that energy can neither be created or destroyed? Does that mean that matter is just expanding further into the universe and therefore further from the Earth, and consequently the Ea...
- Sun Feb 02, 2020 3:03 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: degeneracy
- Replies: 3
- Views: 146
Re: degeneracy
Angus Wu_4G wrote:Here's a simple website that I used that helped me understand the concept, I hope it helps:
http://hyperphysics.phy-astr.gsu.edu/hb ... ntrop.html
I found this super helpful! thank you!
- Sun Feb 02, 2020 3:01 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Weaker Base, Higher pKb
- Replies: 4
- Views: 247
Re: Weaker Base, Higher pKb
Veronica Lu 2H wrote:the bigger the kb, the lower the pkb (log properties) which also means the stronger the base
so then did Lavelle mean to say that the higher the kb, the stronger the base? because the original post here says that he stated that the higher the kb, the weaker the base. now I'm confused.
- Sun Feb 02, 2020 2:58 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Closed Systems
- Replies: 14
- Views: 883
Re: Closed Systems
Emily Lo 1J wrote:How can you change the energy in a closed system? And does it differ with isolated systems?
Quoting this because I want to see the replies that it gets :)
- Sun Feb 02, 2020 2:56 pm
- Forum: Ideal Gases
- Topic: pv=nrt
- Replies: 9
- Views: 366
Re: pv=nrt
How many variables would we have to be given? All but one? Or are there cases where we are only given two or three variables and we are supposed to find the remaining two? If so, what chemistry knowledge would allow for this, since traditionally in algebra we are seeking the value for a single varia...
- Sun Feb 02, 2020 2:54 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Difference between qv and qp
- Replies: 5
- Views: 386
Re: Difference between qv and qp
Under conditions of constant pressure, the piston has to be freely movable, thus accommodating for the constant pressure when heated. This would mean that under constant pressure the q would be the enthalpy change or equivalent to the amount of heat added. However, under conditions of constant volu...
- Sun Jan 19, 2020 7:54 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Pa and Pb
- Replies: 4
- Views: 203
Re: Pa and Pb
Pa is for acids and Pb is for bases I think
- Thu Jan 16, 2020 3:03 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Inert Gas and Le Chatliers
- Replies: 7
- Views: 221
Re: Inert Gas and Le Chatliers
Although adding an inert gas will increase the pressure of a system, the partial pressures of the reactive gases are not changing because the volume has stayed the same. Therefore, K stays the same and there is no shift in the system. so do we not have to be concerned about the change in pressure e...
- Thu Jan 16, 2020 3:01 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Approximation
- Replies: 8
- Views: 269
Re: Approximation
also how do you know if you add or subtract x in the C section of the ICE table?
- Thu Jan 16, 2020 3:00 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ka/Kb of 10^-4
- Replies: 3
- Views: 68
Re: Ka/Kb of 10^-4
It's not "safe" when the value is like 8.5555x10^-4 because that's too close to 10^-3. if its 2.57584 x10^-4 you should be good. he said they would make it obvious on the test though.
- Thu Jan 16, 2020 2:58 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6D.7
- Replies: 2
- Views: 131
Re: 6D.7
Can you solve for the Ka using pH? Like pKa is related to pH enough? Not sure
- Thu Jan 16, 2020 2:57 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Protonation & Deprotonation
- Replies: 9
- Views: 326
Re: Protonation & Deprotonation
To calculate % deprotonation (because this is the most common factor that questions ask for), 1) solve for the x variable in the ICE table 2) put x over the initial concentration (Divide x by initial concentration: x/[R]) 3) multiply by 100 to convert that to number to a % 4) that is your % deproto...
- Thu Jan 16, 2020 2:57 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Protonation & Deprotonation
- Replies: 9
- Views: 326
Re: Protonation & Deprotonation
I think that this is what Lavelle was trying to demonstrate using the Lewis structures in the water example of how pH is decided. Like H3O+ vs OH-, OH- is deprotonated and H3O+ is protonated?
- Thu Jan 16, 2020 2:55 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Units in ICE Table
- Replies: 8
- Views: 214
Re: Units in ICE Table
mol.L^-1
- Thu Jan 16, 2020 2:54 pm
- Forum: Ideal Gases
- Topic: 5I.15
- Replies: 5
- Views: 432
Re: 5I.15
yeah if you have the initial concentration of either the reactants or the products you should put that in for the I in ICE and then generally add or subtract x (since we don't know the factors) and then do the opposite to the other side under C. then just combine those for E and solve for the unknow...
- Thu Jan 16, 2020 2:52 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Help on 5.35
- Replies: 5
- Views: 217
Re: Help on 5.35
then just simplify and you should have all parts to the question answered
- Wed Jan 08, 2020 8:06 pm
- Forum: Ideal Gases
- Topic: Gas Law
- Replies: 6
- Views: 231
Re: Gas Law
Ronak Naik wrote:The gas law is an expression that relates P and V to concentration. Thus it allows you to convert between partial pressures and concentration of a reactant or product that is in equilibrium during a reaction.
When is it relevant to use this?
- Wed Jan 08, 2020 8:05 pm
- Forum: Ideal Gases
- Topic: Dynamic Equilibrium
- Replies: 10
- Views: 357
Re: Dynamic Equilibrium
The reaction never stops when balanced at equilibrium, it just constantly flows in both directions at the same rate.
- Wed Jan 08, 2020 8:04 pm
- Forum: Ideal Gases
- Topic: Equilibrium
- Replies: 7
- Views: 206
Re: Equilibrium
Q is just used to compare to K in order to determine which reaction will proceed (toward product or reactant).
- Wed Jan 08, 2020 8:01 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Partial Pressures
- Replies: 3
- Views: 495
Re: Partial Pressures
Is anyone able to give a simple, direct description of this concept?
- Wed Jan 08, 2020 7:59 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: How to make ICE box
- Replies: 17
- Views: 1222
Re: How to make ICE box
Unless you are given the precise change, you would just use x as an placeholder. For reactants, the change will be negative x, and for products the change will be positive x. Be sure to also account for the coefficients in the balanced chemical equation, if there is a coefficient of 2, then your ch...
- Wed Jan 08, 2020 7:57 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Partial Pressure of gas
- Replies: 5
- Views: 217
Re: Partial Pressure of gas
It really depends on the problem. If it's not given, then just don't use them.
- Tue Dec 03, 2019 9:42 pm
- Forum: Bronsted Acids & Bases
- Topic: CaO
- Replies: 10
- Views: 1506
Re: CaO
how do you know what is a base if it doesn't have OH
- Tue Dec 03, 2019 9:38 pm
- Forum: Biological Examples
- Topic: Polydentate
- Replies: 4
- Views: 249
Re: Polydentate
Polydentate is when a ligand can have multiple bonding sites to the transition metal. An example of this would be ethylenediamine (en) or diethylenetriamine (dien). Polydentates form chelates where the ligand forms a ring of atoms including the transition metal cations. These cations are bound tigh...
- Tue Dec 03, 2019 9:37 pm
- Forum: Lewis Acids & Bases
- Topic: Naming Acids
- Replies: 3
- Views: 219
Re: Naming Acids
Didn't know where else to put this so how do you make a new post?
- Tue Dec 03, 2019 9:36 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Sigma and Pi Bonds
- Replies: 12
- Views: 1026
Re: Sigma and Pi Bonds
Matia Kim 1B wrote:Does a triple bond have 1 sigma bond and two pi bonds? Or is it 2 sigma bonds or something totally different?
there are never 2 sigma bonds connecting two atoms. always start with a sigma and then add pi bonds
- Tue Dec 03, 2019 9:31 pm
- Forum: Hybridization
- Topic: writing hybridization
- Replies: 3
- Views: 287
Re: writing hybridization
it also depends on which one u are hybridizing, if the lone pair is on the N, I think thats sp
- Tue Dec 03, 2019 9:30 pm
- Forum: Hybridization
- Topic: writing hybridization
- Replies: 3
- Views: 287
Re: writing hybridization
2 pi bonds on either side of 1 sigma bond. not sure what ur asking about lone pairs?
- Tue Dec 03, 2019 2:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
- Replies: 115
- Views: 12268
Re: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
For number 4 how does the hybridization become sp2 if there are 4 p electrons and 2 s electrons?
- Wed Nov 20, 2019 12:25 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Sigma and Pi Bonds
- Replies: 12
- Views: 1026
Re: Sigma and Pi Bonds
Lauren Ho 2E wrote:Here's a visual that I hope helps!
what makes the sigma bonds stronger?
- Wed Nov 20, 2019 12:22 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Intermolecular Forces
- Replies: 6
- Views: 359
Re: Intermolecular Forces
MingdaH 3B wrote:the shape, molar mass, and individual atomic electronegativity is generally what you'd need to determine IMF. IMF then determines boiling point / melting point, not the other way around.
where can we find this info?
- Wed Nov 20, 2019 12:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Why is CH2Cl2 polar?
- Replies: 12
- Views: 738
Re: Why is CH2Cl2 polar?
You should think of this molecule in the 3d form. In a tetrahedral, no matter where you put the atoms the Chlorine atoms will always be next to each other. I can't Draw a picture on here, but just look one up it might be helpful. The lewis structure looks like u can orient the chlorines to be oppos...
- Wed Nov 20, 2019 12:19 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Seesaw Shape
- Replies: 12
- Views: 601
Re: Seesaw Shape
any tips on how to easily calculate the angles? or are we better off memorizing them?
- Wed Nov 20, 2019 12:18 pm
- Forum: Sigma & Pi Bonds
- Topic: Why are sigma bonds stronger than pi bonds?
- Replies: 6
- Views: 365
Re: Why are sigma bonds stronger than pi bonds?
AArmellini_1I wrote:Because in a sigma bond the orbitals can overlap to a greater extent where as with pie bonds they are overlapping indirectly which means they can't overlap as much as sigma bond. The more they over lap, the stronger the pull
what do you mean by "overlap"?
- Wed Nov 13, 2019 5:46 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sulfur Hexafluoride VSEPR
- Replies: 3
- Views: 700
Re: Sulfur Hexafluoride VSEPR
Kate Osborne 1B wrote:Octahedral shape describes a compound with 6 shared pairs of electrons and since there are 6 bonds in SF6 it is octahedral.
the term is just misleading
- Wed Nov 13, 2019 5:44 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Class grading
- Replies: 12
- Views: 749
Re: Class grading
it says on the syllabus that 50% in the class is a C-, is this true?
- Wed Nov 13, 2019 5:43 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Exam 2
- Replies: 3
- Views: 165
Re: Exam 2
does it include the midterm topics?
- Wed Nov 13, 2019 5:42 pm
- Forum: SI Units, Unit Conversions
- Topic: Memorizing Conversions
- Replies: 25
- Views: 1294
Re: Memorizing Conversions
id say just memorize everything you can!
- Wed Nov 13, 2019 5:41 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Week 9 homework
- Replies: 11
- Views: 701
Re: Week 9 homework
Katherine Chhen 3I wrote:Since week 9 is thanksgiving break and I have discussion on Thursday, would homework still be due for that week?
maybe the monday after? let us know if u find out!
- Wed Nov 13, 2019 5:40 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Linear VSEPR model
- Replies: 21
- Views: 1258
Re: Linear VSEPR model
So the number of lone pairs can also determine the molecular shape of a molecule? Yes, lone pairs can influence the molecular shape of a molecule but as mentioned by the previous responses we have not gone over it yet. However, to have an idea of some examples I provided an image below that shows y...
- Wed Nov 13, 2019 5:39 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Linear VSEPR model
- Replies: 21
- Views: 1258
Re: Linear VSEPR model
I know that when the central atom has only two bonding pairs as far as possible, forming an 180 degree angle, it is considered to be a linear shape, but what if the central atom has lone pairs in addition to the two bonds? I was also confused about this in the homework, I think it depends on the an...
- Wed Nov 13, 2019 5:39 pm
- Forum: Lewis Structures
- Topic: Curiosity [ENDORSED]
- Replies: 6
- Views: 1184
Re: Curiosity [ENDORSED]
Yeah, hi, just wondering if anyone would give any tips on how to draw the Lewis Structure for the chemical compound mentioned in 3F1c. H2SeO4... The problem never asked for the Lewis structure, but I'm just asking out of curiousity's sake:) (and plus, it'd probably really help to find the solution,...
- Wed Nov 13, 2019 5:38 pm
- Forum: Lewis Structures
- Topic: Curiosity [ENDORSED]
- Replies: 6
- Views: 1184
Re: Curiosity [ENDORSED]
Yeah, hi, just wondering if anyone would give any tips on how to draw the Lewis Structure for the chemical compound mentioned in 3F1c. H2SeO4... The problem never asked for the Lewis structure, but I'm just asking out of curiousity's sake:) (and plus, it'd probably really help to find the solution,...
- Wed Nov 13, 2019 5:37 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR model angles
- Replies: 7
- Views: 383
Re: VSEPR model angles
at least be able to figure them out conceptually if asked. 360/3 planes = 120 is how I think of it but make it the avg
- Wed Nov 13, 2019 5:36 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 7
- Views: 437
Re: Formal Charge
705198479 wrote:when is will we know to calculate a formal charge, will it be noticeable in the question or are there key words
do it when drawing lewis structures
- Wed Nov 13, 2019 5:35 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 7
- Views: 437
Re: Formal Charge
try to calculate the lowest charges overall...
#of electrons in valence shell - [# of electrons in lone pairs + (# bonded electrons/2)]
#of electrons in valence shell - [# of electrons in lone pairs + (# bonded electrons/2)]
- Wed Nov 13, 2019 5:33 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Memorization
- Replies: 15
- Views: 955
Re: Memorization
but for the names, i think so
- Wed Nov 13, 2019 5:32 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Memorization
- Replies: 15
- Views: 955
Re: Memorization
you should be able to figure them out by conceptualizing them
- Wed Nov 13, 2019 5:32 pm
- Forum: Empirical & Molecular Formulas
- Topic: empirical = molecular?
- Replies: 15
- Views: 905
Re: empirical = molecular?
If the questions asks to find the molecular and empirical formula, first try to find the empirical formula which is to covert the grams into moles that’s given for each element. Then divide each element by the smallest mole value (for empirical). Remember that the coefficient can only be a whole in...
- Wed Nov 13, 2019 5:31 pm
- Forum: Bond Lengths & Energies
- Topic: Bond lengths in molecules
- Replies: 7
- Views: 463
Re: Bond lengths in molecules
Bonds are longer or shorter depending on the distance between the two atoms. If there are multiple bonds, there are more shared electrons, so the atoms are more closely held together and the bonds are shorter. Also, if the atoms are smaller they can be closer together, so smaller atoms also make sh...
- Thu Oct 31, 2019 1:06 pm
- Forum: Lewis Structures
- Topic: Drawing lewis structures
- Replies: 8
- Views: 228
Re: Drawing lewis structures
it doesn't matter until we cover shaping
- Thu Oct 31, 2019 1:06 pm
- Forum: Dipole Moments
- Topic: van der waal
- Replies: 4
- Views: 258
Re: van der waal
are we supposed to know this already???
- Thu Oct 31, 2019 1:05 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 2
- Views: 144
Re: Midterm
its everything until section 2D??? of bonds
- Thu Oct 31, 2019 12:44 pm
- Forum: Lewis Structures
- Topic: Creating Lewis Structures
- Replies: 7
- Views: 277
Re: Creating Lewis Structures
the middle one is the one that creates the most bonds, and also its normally always carbon if carbon is one of the elements. oxygen and sulfur are also typical centered.
- Thu Oct 31, 2019 12:43 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Study Tips!
- Replies: 7
- Views: 295
Re: Study Tips!
make your own graphic organizer!! Use formulas as main headlines and write a checklist of things you know and things you don't know.
- Wed Oct 23, 2019 11:27 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Spin Quantum Number
- Replies: 6
- Views: 191
Re: Spin Quantum Number
Parker Smith wrote:the +1/2 and the -1/2 are used to signify the spin of the electron. So if you are only drawing the arrows, you probably don't need to use the ms numbers because the arrows signify spin direction already. It depends on what the problem asks of you.
how do you know which direction it goes though?
- Wed Oct 23, 2019 11:26 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Sonia Week 4 Worksheet
- Replies: 2
- Views: 158
Re: Sonia Week 4 Worksheet
Thank you for sharing!
- Wed Oct 23, 2019 11:26 am
- Forum: Quantum Numbers and The H-Atom
- Topic: 1D. 23)
- Replies: 5
- Views: 286
Re: 1D. 23)
On problem 1D.23 I am having trouble. How do I begin to know how many orbitals can have the following quantum numbers in an atom? The concept, in general, confuses me, not just this specific question. I believe we went over it in class. I would check google images for a diagram to be sure of the nu...
- Wed Oct 23, 2019 11:24 am
- Forum: DeBroglie Equation
- Topic: Velocity
- Replies: 13
- Views: 873
Re: Velocity
If we calculate a velocity for an electron, proton or neutron that is higher than the speed of light, should we assume we did something wrong, or is there possibility for this to be an answer and we have to say that this is "unreasonable?" I think we did an example problem like this, I do...
- Wed Oct 23, 2019 11:22 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Atomic Radius
- Replies: 18
- Views: 605
Re: Atomic Radius
Tai Metzger 3K wrote:In general, the periodic table has the following trends for atomic radius:
As you move down a column, atomic radius increases.
As you move from left to right along a row, the atomic radius decreases.
Do we need to know the exact number though?
- Fri Oct 18, 2019 4:21 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Hund's Rule
- Replies: 4
- Views: 193
Re: Hund's Rule
Suraj Doshi 1L wrote:Can an two electrons within the same subshell have different energies associated with them?
I thought he said something like this in class, but I don't know.
- Fri Oct 18, 2019 4:20 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: wave functions/orbitals/quantum numbers
- Replies: 2
- Views: 139
Re: wave functions/orbitals/quantum numbers
Ashley Tran 4B wrote:How are wave functions/orbitals connected to quantum numbers? I'm confused... isn't the wave function about the whole atom and the quantum number refers to individual electrons?
Not electrons but photons.
- Fri Oct 18, 2019 4:19 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: wave functions/orbitals/quantum numbers
- Replies: 2
- Views: 139
Re: wave functions/orbitals/quantum numbers
I'm not sure about quantum numbers specifically, but it all just represents the behavior of photons in different scenarios.
- Fri Oct 18, 2019 4:17 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Electron configuration with s and d subshells
- Replies: 4
- Views: 146
Re: Electron configuration with s and d subshells
Isn't there an exception? I'm also confused.
- Fri Oct 18, 2019 4:16 pm
- Forum: *Black Body Radiation
- Topic: Will this concept be tested
- Replies: 8
- Views: 1174
Re: Will this concept be tested
Which concept are you talking about?
- Fri Oct 18, 2019 4:15 pm
- Forum: Einstein Equation
- Topic: HW 1B. 7
- Replies: 6
- Views: 417
Re: HW 1B. 7
First use the E=hc/wavelength formula to find the energy. Then, multiply that my the mols of Na and avagadros number to get the energy for 5g of Na. After that, multiple avagadros number to the number you calculated in part a to find the energy for 1mol of Na. So avogadro's number is how you get it...
- Fri Oct 18, 2019 4:14 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Spin State
- Replies: 17
- Views: 368
Re: Spin State
Let's talk about spin. What is even going on and how do we know if it's positive or negative?
- Fri Oct 11, 2019 3:32 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 334337
Re: Final Jitters
I have this issue and it happened today for a quiz. Honestly just think of it of an assessment of how much you know and try not to anticipate questions having the purpose of confusing you. If you know things, you have the opportunity to demonstrate it. I wish I would have thought of it this way.
- Fri Oct 11, 2019 3:30 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Chemical Reactions
- Replies: 20
- Views: 1070
Re: Balancing Chemical Reactions
I'm still having some difficulty balancing equations that require more than just inspection. Is there another, possibly longer but more accurate method to balancing "harder" chemical reactions. For example: Cu + HNO3 → Cu(NO3)2 + NO + H2O All I know is you should start with the least freq...
- Fri Oct 11, 2019 3:28 pm
- Forum: DeBroglie Equation
- Topic: When to use DeBroglie Equation
- Replies: 16
- Views: 639
Re: When to use DeBroglie Equation
Doesn't it have to do with when there is a quantifiable mass given and there are wave-like and particle-like properties both?
- Fri Oct 11, 2019 3:27 pm
- Forum: Student Social/Study Group
- Topic: Study Tips
- Replies: 58
- Views: 4318
Re: Study Tips
Drake Choi_1I wrote:Is it a good idea to review online modules before lectures so that I can be familiar with what is going to be lectured on? Or should I review after I have had the lecture? Thank you :)
YES this is what helps me the most!