Search found 102 matches
- Tue Mar 10, 2020 9:03 pm
- Forum: Student Social/Study Group
- Topic: Need suggestions on study websites
- Replies: 4
- Views: 462
Re: Need suggestions on study websites
Khan Academy is definitely helpful for me, the organic chemistry tutor I heard is also a good one to check out!
- Tue Mar 10, 2020 8:49 pm
- Forum: Student Social/Study Group
- Topic: Lyndon Review
- Replies: 6
- Views: 686
Re: Lyndon Review
did lyndon already put up the worksheet?
- Tue Mar 10, 2020 8:48 pm
- Forum: Student Social/Study Group
- Topic: Number of Chemistry Community Posts
- Replies: 45
- Views: 2584
Re: Number of Chemistry Community Posts
I was curious about this too and whether or not we simply needed 100 posts by the end of this quarter. I believe I had more than 50 last quarter but was not sure if I would still need 50 more posts this quarter or just the remainder to 100. I would definitely assume that it resets this quarter so t...
- Tue Mar 10, 2020 8:47 pm
- Forum: Student Social/Study Group
- Topic: Number of Chemistry Community Posts
- Replies: 45
- Views: 2584
Re: Number of Chemistry Community Posts
ashwathinair wrote:Sometimes I post multiple times on the same thread - is this counted as separate posts or as just one?
if you post multiple times on the same thread it will still count as separate posts.
- Tue Mar 10, 2020 8:44 pm
- Forum: Student Social/Study Group
- Topic: Curve?
- Replies: 50
- Views: 6384
Re: Curve?
So the syllabus says that a 50% is required o pass the class with at least a C- but at the same time, "there's no curve" is what I've been hearing from most students so if I have a 75% in the class it'll remain the same but if I get a 50% it'll jump up to 70%? The "curve" is bas...
- Tue Mar 10, 2020 8:42 pm
- Forum: Student Social/Study Group
- Topic: The Final
- Replies: 5
- Views: 521
Re: The Final
He hasn't sent an email yet, but I'm assuming the review sessions are cancelled, right?
- Wed Mar 04, 2020 8:55 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6M.1
- Replies: 3
- Views: 306
Re: 6M.1
So just to clarify, if we use the E^o= E^o(Cathode)- E^o(Anode) method, we don't switch the signs but if we use the adding method, we do have to switch the signs?
- Wed Mar 04, 2020 8:49 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6M.1
- Replies: 3
- Views: 306
Re: 6M.1
how is the Cu(s)|Cu2+ the anode if it is on the right of the cell diagram?
- Wed Mar 04, 2020 7:24 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6L.7
- Replies: 3
- Views: 328
Re: 6L.7
for part a) why could we not just split up the half-reactions into Ag and Br separately?
- Wed Mar 04, 2020 7:10 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagrams
- Replies: 7
- Views: 455
Re: Cell Diagrams
Also, why do we not use the balanced redox reaction (and each molecule's stoichiometric coefficients) when writing out the cell diagram?
- Wed Mar 04, 2020 6:57 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagrams
- Replies: 7
- Views: 455
Cell Diagrams
When you have a nonmetal in the reaction, how do you know when to use platinum and when to use graphite as an inert conductor?
- Fri Feb 28, 2020 3:40 pm
- Forum: Balancing Redox Reactions
- Topic: Test 2
- Replies: 10
- Views: 729
Test 2
Can someone please tell me what is being covered on test 2 again?
- Fri Feb 28, 2020 3:36 pm
- Forum: Balancing Redox Reactions
- Topic: REDOX Agents
- Replies: 9
- Views: 785
Re: REDOX Agents
Leslie Almaraz 4G wrote:what is the purpose of identifying the agents?
I think the main reason is just to understand that redox reactions work of each other. A reaction that oxidizes one molecule has to be paired to one that reduces another, and the electrons that are taken from one are given to another.
- Fri Feb 28, 2020 3:34 pm
- Forum: Balancing Redox Reactions
- Topic: REDOX Agents
- Replies: 9
- Views: 785
Re: REDOX Agents
Why are the species that are oxidized called reducing agents and vice versa? something that is oxidized is a reducing agent because in becoming oxidized, it reduces another molecule. the same goes for the other way around: a molecule that was reduced had to have oxidized another for it to reach tha...
- Fri Feb 28, 2020 3:31 pm
- Forum: Balancing Redox Reactions
- Topic: How to tell if its being reduced or oxidized
- Replies: 15
- Views: 2136
Re: How to tell if its being reduced or oxidized
That makes sense but when I tried it for 6K.3 on the hw, I got confused again. How would you write the half reactions for part a?
Cl2 + S2O3^2- goes to Cl^- + SO4^2-
Cl2 + S2O3^2- goes to Cl^- + SO4^2-
- Fri Feb 28, 2020 3:26 pm
- Forum: Balancing Redox Reactions
- Topic: Writing half reactions
- Replies: 9
- Views: 671
Re: Writing half reactions
it makes sense to do it that way, but would it necessarily be wrong to write it the other way around?
- Sat Feb 22, 2020 11:21 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Ways to Calculate Standard Cell Potentials
- Replies: 3
- Views: 393
Re: Ways to Calculate Standard Cell Potentials
You only reverse one of the reactions and change the sign of one of the standard potentials with the first method. If you try reversing and changing the signs with the second method, you get a different value entirely. Conceptually, why can you not reverse the cell potential value of the reversed r...
- Sat Feb 22, 2020 11:15 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Electrode
- Replies: 3
- Views: 303
Re: Electrode
Why is platinum used above graphite and other inert conductors?
- Sat Feb 22, 2020 11:12 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: How to write Cell Diagrams
- Replies: 5
- Views: 455
Re: How to write Cell Diagrams
The basic structure of a cell diagram is (left) anode || (right) cathode, where || represents a salt bridge. You want to put the substance being oxidized on the left and and the substance being reduced on the right so that the voltage is positive. Within the left or right side, you want to write ou...
- Sat Feb 22, 2020 10:48 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Purpose of Salt Bridge
- Replies: 12
- Views: 825
Re: Purpose of Salt Bridge
the purpose of the salt bridge is to neutralize the two reactions.
- Sat Feb 22, 2020 10:44 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic Cells
- Replies: 8
- Views: 486
Re: Galvanic Cells
Orrin Zhong 4G wrote:Galvanic cells use the energy from spontaneous redox reactions. As the electrons go from the anode to the cathode along a wire, the flow of electrons can be used to do work.
Is it possible for the electrons to flow the opposite way?
- Fri Feb 14, 2020 12:02 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Pizza Rolls 6 (pt.1)
- Replies: 10
- Views: 753
Re: Pizza Rolls 6 (pt.1)
Leila_4G wrote:We are never given T so we can't solve the last step for w and therefore q.
You can use pV=nRT to solve for T and then solve for work.
- Thu Feb 13, 2020 11:51 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Pizza Rolls 6 (pt.1)
- Replies: 10
- Views: 753
Re: Pizza Rolls 6 (pt.1)
It is because you are considering delta U and delta S over the ENTIRE process, and because they are state functions, their pathway does not matter. In the problem, the final volume and pressure are the same so the change in either is 0.
- Thu Feb 13, 2020 11:48 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Why is delta U a state function?
- Replies: 4
- Views: 366
Re: Why is delta U a state function?
Why is heat capacity a state function?
- Tue Feb 11, 2020 10:36 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: HW 4I. 5
- Replies: 3
- Views: 323
HW 4I. 5
"Suppose that 50.0g of water at 20.0 C is mixed with 65.0g of water at 50.0 C at constant atmospheric pressure in a thermally insulated vessel. Calculate delta S and delta S total for the process."
How would I go about solving this problem?
How would I go about solving this problem?
- Tue Feb 11, 2020 10:33 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: HW 4F.17
- Replies: 1
- Views: 191
HW 4F.17
I don't know how to calculate this with the information given, but I think it has to do with the nCLn(T2/T1) formula, right? "Calculate the standard entropy of vaporization of water at 85 C, given that its standard entropy of vaporization at 100 C is 109.0 J/Kmol and the molar heat capacities a...
- Fri Feb 07, 2020 10:28 am
- Forum: Student Social/Study Group
- Topic: Any Worksheets from UA/TA/etc?
- Replies: 14
- Views: 682
Re: Any Worksheets from UA/TA/etc?
I know that Lyndon always posts a worksheet before his big review session, but I don't think he has uploaded one yet (hopefully soon!)
- Fri Feb 07, 2020 10:25 am
- Forum: Student Social/Study Group
- Topic: Curve?
- Replies: 50
- Views: 6384
Re: Curve?
if anyone knows more about this may they please update us, I have this similar question. As long as you receive half the points in the class, you will pass with at least a C-, but the actual letter grades will vary each quarter depending on class averages (which is why he waits until the end to dec...
- Fri Feb 07, 2020 10:20 am
- Forum: Student Social/Study Group
- Topic: Midterm Topics
- Replies: 12
- Views: 730
Re: Midterm Topics
So I'm assuming that everything covered up through today's lecture (Fri 02/07) is going to be on the midterm, right?
- Fri Feb 07, 2020 10:18 am
- Forum: Student Social/Study Group
- Topic: midterm/final
- Replies: 12
- Views: 2249
Re: midterm/final
i find that the tests are very straightforward and math based questions, but the midterm questions are very implicit and challenging (in my opinion). you really need to know and understand the concepts to be able to solve the questions on the midterms and the final.
- Fri Feb 07, 2020 10:14 am
- Forum: Student Social/Study Group
- Topic: Midterm and Final Question
- Replies: 18
- Views: 1109
Re: Midterm and Final Question
there's no official study guide, but there are plenty of review sessions. the UA's also put together a big review session going over all the topics, and they upload a worksheet for it (which is very helpful).
- Thu Jan 30, 2020 11:46 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 4C.3 Change in Enthalpy
- Replies: 6
- Views: 538
Re: 4C.3 Change in Enthalpy
For question 4C.3, it asks "Calculate the final temperature and the change in enthalpy when 765 J of energy is transferred as heat to 0.820 mol Kr(g) at 298 K and 1.00 atm (a) at constant pressure; (b) at constant vol- ume. Treat the gas as ideal." I understand how to calculate the final ...
- Thu Jan 30, 2020 11:43 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: explain terms
- Replies: 2
- Views: 172
Re: explain terms
I am confused about how finding the standard enthalpy using the standard enthalpies of formation works. How and why does it work? Are the values of the standard enthalpy of formation negative because the molecule is losing energy in creating a bond?
- Thu Jan 30, 2020 11:35 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Delta H v. q
- Replies: 5
- Views: 264
Re: Delta H v. q
Delta H is equal to q only when the gas is at a constant pressure. By definition, enthalpy (deltaH) is the amount of heat released/absorbed at a CONSTANT PRESSURE, so the heat required to change temp of gas at a constant pressure is the same as enthalpy.
- Thu Jan 30, 2020 11:28 am
- Forum: Phase Changes & Related Calculations
- Topic: Molar Heat Capacity at Cp s. Cv
- Replies: 4
- Views: 223
Molar Heat Capacity at Cp s. Cv
I am kinda confused on the differences between the molar heat capacity of a gas at constant volume versus constant pressure. Why does it matter in terms of molar heat (is it applicable for specific heat as well)? Can you use the q=nCdeltaT equation for either situation?
- Thu Jan 30, 2020 11:16 am
- Forum: Phase Changes & Related Calculations
- Topic: 4A. 1 Identifying open and closed system
- Replies: 11
- Views: 2731
Re: 4A. 1 Identifying open and closed system
c) is an isolated system because the calorimeter does not allow exchange of matter or eneergy with the surroundings, and d) is an open system because gasoline in an automobile can change in tempertaure (energy) and in matter (which is why we need to refill our tank).
- Thu Jan 23, 2020 6:33 pm
- Forum: Ideal Gases
- Topic: Acid and Bases
- Replies: 16
- Views: 577
Re: Acid and Bases
Yes, a pH lower than 7 is acidic, and a pH higher than 7 is basic.
- Thu Jan 23, 2020 6:31 pm
- Forum: Ideal Gases
- Topic: solids and K
- Replies: 8
- Views: 350
Re: solids and K
solids do not have concentration or partial pressure.
- Thu Jan 23, 2020 6:30 pm
- Forum: Ideal Gases
- Topic: Kc vs Kp
- Replies: 109
- Views: 4878
Re: Kc vs Kp
connie 2C wrote:when a chemical equation is written and all the reactants and products are gases, do you use Kp rather than Kc? in what cases do you use Kc rather than Kp?
You can use whatever is convenient when they're all gases. You cannot use KP if it's not a gas.
- Thu Jan 23, 2020 6:27 pm
- Forum: Ideal Gases
- Topic: homework #3
- Replies: 16
- Views: 907
Re: homework #3
you can either do acids/bases or thermochemistry.
- Thu Jan 23, 2020 6:23 pm
- Forum: Ideal Gases
- Topic: test 1
- Replies: 9
- Views: 425
Re: test 1
test 1 only covers chemical equilibrium & acids/bases.
- Wed Jan 15, 2020 5:02 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Endothermic and exothermic reactions
- Replies: 11
- Views: 1106
Re: Endothermic and exothermic reactions
If the temperature increases, the reaction will favor the products in an endothermic reaction because it requires heat to form the product. If you add heat, the reaction is going to want to use up that heat. Therefore, in an endothermic reaction, the reaction will continue forward, towards the produ...
- Wed Jan 15, 2020 4:43 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: What is this?
- Replies: 23
- Views: 1474
Re: What is this?
Le Chatelier's principle just emphasizes the fact that reactions like to maintain equilibrium, so if anything disrupts that equilibrium (i.e. change in conc., change in volume/pressure), the reaction will shift in order to get back to that equilibrium state. We just use this knowledge to recognize t...
- Wed Jan 15, 2020 4:30 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: volume change with inert gas
- Replies: 9
- Views: 255
Re: volume change with inert gas
the inert gas will not affect the concentration or partial pressures of the products or the reactants, they will remain constant so the reaction does not shift.
- Wed Jan 15, 2020 4:14 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: volume's effect on K
- Replies: 7
- Views: 234
Re: volume's effect on K
I know Prof. Lavelle mentioned this in lecture briefly, but why are neither the products nor the reactants favored when the volume decreases and the number of moles are equal on both sides?
- Wed Jan 15, 2020 4:01 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Endothermic and Exothermic Reactions Class Example
- Replies: 5
- Views: 207
Re: Endothermic and Exothermic Reactions Class Example
N2 is more stable in that it has a triple bond. energy is always required to break bonds and released to make bonds. since the N2 bonds must be broken, it is an endothermic reaction.
- Fri Jan 10, 2020 4:40 pm
- Forum: Ideal Gases
- Topic: Solving for K (coefficients)
- Replies: 11
- Views: 580
Re: Solving for K (coefficients)
The coefficients go with the molecule it is next to in the chemical reaction. The coefficients will be the exponent the concentration of the respective molecule is raised to.
- Fri Jan 10, 2020 4:32 pm
- Forum: Ideal Gases
- Topic: PV=nRT equation manipulation
- Replies: 13
- Views: 719
Re: PV=nRT equation manipulation
Ok I see, but there won't be any problems that give both concentration and pressure for different elements right? manipulating the ideal gas law equation gives us a way to convert either partial pressure to concentration or vice versa. so, even if a problem provides values both ways, we should be a...
- Fri Jan 10, 2020 4:21 pm
- Forum: Ideal Gases
- Topic: Difference between K and Q
- Replies: 9
- Views: 328
Re: Difference between K and Q
Q is the reaction quotient, which is the ratio of the reaction at any given time, not just when the system is at equilibrium.
- Fri Jan 10, 2020 4:15 pm
- Forum: Ideal Gases
- Topic: R in PV=nRT
- Replies: 34
- Views: 6683
Re: R in PV=nRT
R is the ideal gas constant, which will probably be given to us on a test/exam.
- Fri Jan 10, 2020 4:13 pm
- Forum: Ideal Gases
- Topic: What is the Importance of homogeneous vs heterogeneous equilibria [ENDORSED]
- Replies: 12
- Views: 532
Re: What is the Importance of homogeneous vs heterogeneous equilibria [ENDORSED]
It's also important to note that for a homogeneous gas equilibrium, we can calculate Kp, but we cannot calculate Kp for a heterogeneous equilibrium that involves both gas and aqueous species. Thank you for pointing that out! We would have to convert everything into concentrations, not partial press...
- Sat Dec 07, 2019 10:26 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 363479
Re: Final Jitters
I just try to go over as much as I can without overwhelming myself; when I start to get stressed I just stop and do something I enjoy to distract myself. sometimes I will come back to studying later if I feel I need it.
- Sat Dec 07, 2019 6:49 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis vs Bronsted
- Replies: 3
- Views: 231
Re: Lewis vs Bronsted
yea, bronsted def has to do with protons while lewis def does not
- Sat Dec 07, 2019 6:47 pm
- Forum: SI Units, Unit Conversions
- Topic: midterm/final
- Replies: 18
- Views: 1482
Re: midterm/final
the test will prob consist more of calculation with a few concept questions thrown in, but you need to know all the concepts to answer the questions.
- Sat Dec 07, 2019 6:43 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: chelating ligands [ENDORSED]
- Replies: 51
- Views: 98151
Re: chelating ligands [ENDORSED]
Elizabeth Harty 3A wrote:How do you know if there are sigma bonds available for rotation?
all sigma bonds can rotate, but pi bonds cannot
- Sat Dec 07, 2019 6:03 pm
- Forum: Student Social/Study Group
- Topic: amphoteric vs. amphiprotic
- Replies: 4
- Views: 459
amphoteric vs. amphiprotic
is there a difference between amphiprotic and amphoteric?
- Tue Nov 26, 2019 5:48 pm
- Forum: Student Social/Study Group
- Topic: Cyano vs. Cyanido
- Replies: 3
- Views: 375
Cyano vs. Cyanido
What is the difference between cyano and cyanido when naming coordination complexes?
- Tue Nov 26, 2019 5:47 pm
- Forum: Student Social/Study Group
- Topic: Grades
- Replies: 18
- Views: 1187
Re: Grades
KayleyW_3L wrote:In addition to wondering when the Test 1 grades will be posted, I am also curious whether there is partial credit on the exams?
definitely!! show as much work as possible, and if you show that know the concept, you will get at least a couple points.
- Tue Nov 26, 2019 5:44 pm
- Forum: Student Social/Study Group
- Topic: -ate Nomenclature for final?
- Replies: 2
- Views: 138
Re: -ate Nomenclature for final?
If anything, it might be covered in the next few lectures.
- Tue Nov 26, 2019 5:43 pm
- Forum: Student Social/Study Group
- Topic: Test 2 and Final
- Replies: 18
- Views: 936
Re: Test 2 and Final
I heard that the final is 8 questions and will cover all the topics, but there will be quite a bit on quantum.
- Tue Nov 26, 2019 5:41 pm
- Forum: Student Social/Study Group
- Topic: Test 2 and Final
- Replies: 18
- Views: 936
Re: Test 2 and Final
AlyshaP_3G wrote:205150314 wrote:Does anyone know if we will get some sort of study tools again?
I'm sure Lavelle will be coordinating review sessions like he did for the midterm.
yea my TA said they are going to be holding multiple review sessions covering all the topics we've learned.
- Tue Nov 26, 2019 5:41 pm
- Forum: Student Social/Study Group
- Topic: Test 2 and Final
- Replies: 18
- Views: 936
Re: Test 2 and Final
AlyshaP_3G wrote:205150314 wrote:Does anyone know if we will get some sort of study tools again?
I'm sure Lavelle will be coordinating review sessions like he did for the midterm.
yea my TA said they are going to be holding multiple review sessions covering all the topics we've learned.
- Fri Nov 22, 2019 4:42 pm
- Forum: Coordinate Covalent Bonds
- Topic: Dissociation energy
- Replies: 3
- Views: 364
Re: Dissociation energy
Just in terms of the number of bonds, a molecule with two double bonds would have a higher dissociation energy than one with two single bonds, granted there are no lone pairs on either molecule?
- Fri Nov 22, 2019 4:37 pm
- Forum: Coordinate Covalent Bonds
- Topic: Coordinate vs polar covalent
- Replies: 10
- Views: 2492
Re: Coordinate vs polar covalent
Okay, so just to clarify, lewis acids are the electron donors that give up the electrons and lewis bases receive those electrons, right?
- Fri Nov 22, 2019 4:32 pm
- Forum: Coordinate Covalent Bonds
- Topic: coordinate covalent bond
- Replies: 9
- Views: 661
Re: coordinate covalent bond
Do coordinate covalent bonds occur between atoms in one molecule or between two or more molecules?
- Fri Nov 22, 2019 4:28 pm
- Forum: Coordinate Covalent Bonds
- Topic: bond question
- Replies: 5
- Views: 408
Re: bond question
In general I think pretty much all of the stuff we talk about in this class occurs in nature. You can think of bonds as attempts to lower the energy of the atom. If forming a coord. covalent bond brings the atom to a lower energy that it had with a lone pair, it will do it. Probably a dumb question...
- Fri Nov 22, 2019 4:26 pm
- Forum: Coordinate Covalent Bonds
- Topic: Coordinate covalent bonds
- Replies: 9
- Views: 796
Re: Coordinate covalent bonds
Do coordinate covalent bonds happen only in transition metals?
And does it occur in all transition metals or are there exceptions?
And does it occur in all transition metals or are there exceptions?
- Sat Nov 16, 2019 5:27 pm
- Forum: Student Social/Study Group
- Topic: chem 14b + cehm14bl
- Replies: 9
- Views: 725
Re: chem 14b + cehm14bl
honestly, it's just preference, but I would personally take the lab with the class just bc every topic covered will stay fresh in your mind as you do the lab for that specific topic.
- Sat Nov 16, 2019 5:22 pm
- Forum: Student Social/Study Group
- Topic: Study Tips
- Replies: 58
- Views: 4538
Re: Study Tips
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! I think you can definitely try it both ways and see which works best for you!,...
- Sat Nov 16, 2019 5:15 pm
- Forum: Student Social/Study Group
- Topic: Dipole Moment
- Replies: 5
- Views: 259
Re: Dipole Moment
A dipole moment happens when there is a separation of charge. It can occur in both ionic bonds and covalent bonds and are due to difference in electronegativity. It describes two opposite charges separated by distance.Essentially, it is a measure of the polarity of the molecule. so a compound is po...
- Sat Nov 16, 2019 5:09 pm
- Forum: Student Social/Study Group
- Topic: Dipole Moment
- Replies: 5
- Views: 259
Re: Dipole Moment
Basically, in really broad terms, a dipole moment is found between two atoms who are sharing an electron. Due to one's higher electron affinity, it might hold the electron closer to it than its partner. The increase in negativity as the electron is closer to an atom is what the dipole moment is, if...
- Sat Nov 16, 2019 5:07 pm
- Forum: Student Social/Study Group
- Topic: Test 2
- Replies: 7
- Views: 499
Re: Test 2
so, just to clarify, test 2 covers dipoles and molecular shapes?
- Fri Nov 08, 2019 3:17 pm
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 11
- Views: 800
Re: Final
Yes, it is on Sunday Dec 8 at 11:30 am
- Fri Nov 08, 2019 3:15 pm
- Forum: Student Social/Study Group
- Topic: Dipole Moment
- Replies: 5
- Views: 259
Dipole Moment
Can someone explain what a dipole moment is exactly?
- Fri Nov 08, 2019 3:14 pm
- Forum: Student Social/Study Group
- Topic: Class Grading
- Replies: 44
- Views: 3734
Re: Class Grading
KayleyW_3L wrote:The good thing is he will never curve down, only up.
Wait, so is there a curve or not?
- Fri Nov 08, 2019 3:11 pm
- Forum: Student Social/Study Group
- Topic: Midterm
- Replies: 3
- Views: 302
Midterm
Can someone explain the first question about finding the empirical formula of that compound that was on the midterm?
- Mon Nov 04, 2019 11:19 pm
- Forum: Student Social/Study Group
- Topic: HW 2D13
- Replies: 1
- Views: 134
HW 2D13
Could someone help me with this problem?
it is asking to list the following molecules/ions in order of decreasing bond lengths and explain your reasoning:
a) the CO bond in CO, CO2, CO3 2-
b) the SO bond in SO2, SO3, SO3 2-
c) the CN bond in HCN, CH2NH, CH3NH2
it is asking to list the following molecules/ions in order of decreasing bond lengths and explain your reasoning:
a) the CO bond in CO, CO2, CO3 2-
b) the SO bond in SO2, SO3, SO3 2-
c) the CN bond in HCN, CH2NH, CH3NH2
- Thu Oct 31, 2019 6:14 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation [ENDORSED]
- Replies: 73
- Views: 9061
Re: Rydberg equation [ENDORSED]
ShreyaKannan1B wrote:Is there any problem where you would use Rydberg with another equation?
from my understanding, you would only use the Rydberg EQ when you are looking for the change in energy when an electron moves from one energy level to another.
- Thu Oct 31, 2019 6:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice on Homework
- Replies: 13
- Views: 1642
Re: Advice on Homework
sbeall_1C wrote:Hey! I am planning on doing all the questions listed on the syllabus. Should I turn in all of them or just 5 of them?
you can turn in just 5 or all of them, I don't think it matters. the TA will probably just grade the first 5 if you turn all of them in.
- Thu Oct 31, 2019 6:08 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 16
- Views: 732
Re: Midterm
everything covered so far up to focus 2D will be on the midterm, but I wouldn't worry too much about the fundamentals because we already had a test covering that material. I would still look over it though :)
- Thu Oct 31, 2019 6:06 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Do Midterm Review Sessions Repeat Topics?
- Replies: 4
- Views: 198
Re: Do Midterm Review Sessions Repeat Topics?
there are many review sessions covering the same topic, so if you can't make one, don't worry about it! for specifics, the schedule is posted on the website
- Thu Oct 31, 2019 6:04 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Study Tips!
- Replies: 7
- Views: 329
Re: Study Tips!
all those tips are really helpful! in addition, i would go over all the problem sets again and see if you can solve them without too much help from the textbook and your notes
- Thu Oct 24, 2019 12:21 pm
- Forum: Student Social/Study Group
- Topic: Ionization Energy vs. e- Affinity
- Replies: 3
- Views: 312
Ionization Energy vs. e- Affinity
What is the difference between an atom's ionization energy and the e- affinity, and what are the trends on the periodic table for both?
- Thu Oct 24, 2019 12:19 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 150606
Re: Reading the textbook
Are the hw problems for week 5 from the quantum topic set still or from the chemical bonds set?
- Thu Oct 24, 2019 12:18 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 150606
Re: Reading the textbook
KTran 1I wrote:Are there a lot of topics in the book that are not covered during lecture that show up on tests?
I don't think topics not covered during lecture will ever show up on any exam.
- Thu Oct 24, 2019 12:14 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation [ENDORSED]
- Replies: 73
- Views: 9061
Re: Rydberg equation [ENDORSED]
i understand why the first equation prof. lavelle showed us is negative (-hR/n^2). when he derived the second equation (-R[1/n1^2-1/n2^2]) he kept the negative in front but my TA showed that equation as positive. Which is correct?
- Thu Oct 24, 2019 12:08 pm
- Forum: DeBroglie Equation
- Topic: Photon Equation
- Replies: 4
- Views: 238
Re: Photon Equation
no need to worry about it! Prof Lavelle mentioned the tests would already provide the photon's momentum!
- Thu Oct 17, 2019 10:24 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Wavelength Plausibility
- Replies: 31
- Views: 2690
Re: Wavelength Plausibility
APatel_4A wrote:He said that it is 720 to 400 but that we can just remember 700 to 400 since it's easier!
Because it differs so much according to different tables, I think it will be fine if you just remember 700 to 400
- Thu Oct 17, 2019 10:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: How to find my posts
- Replies: 163
- Views: 167062
Re: How to find my posts
Liza Hayrapetyan-3K wrote:I just want to be clear, so there is no way to get notifications if Professor Lavelle has posted anything?
I don't think you will get actual notifications, you just have to look on the class announcements page.
- Thu Oct 17, 2019 10:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Tutoring? [ENDORSED]
- Replies: 121
- Views: 265124
Re: Tutoring? [ENDORSED]
Also, do the workshops go over what we talk about in lecture?
- Thu Oct 17, 2019 10:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Tutoring? [ENDORSED]
- Replies: 121
- Views: 265124
Re: Tutoring? [ENDORSED]
I attended a step up session the other day, but the pace was way too slow for me? I'm thinking I should just attend the workshops. Does anyone know how the pace is for the workshops?
- Thu Oct 17, 2019 10:04 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Test 1 [ENDORSED]
- Replies: 107
- Views: 21104
Re: Test 1 [ENDORSED]
I can't find my test grades on ccle, where do I go?
- Thu Oct 10, 2019 11:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 7692
Re: Week 2 Homework Problems [ENDORSED]
For homework assignment week 3 would we be able to do week 2 homework problems as well or is it just going to be week 3 homework problems? Week 3 homework is only on Quantum Mechanics; the only reason Prof Lavelle allowed us to use the fundamentals for week 2 homework is because he was giving us th...
- Thu Oct 10, 2019 11:21 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 150606
Re: Reading the textbook
ktran Disc 1I wrote:Are there a lot of topics in the book that are not covered during lecture that show up on tests?
I don't think so. I think everything that will be on a test will be covered in lecture or otherwise noted in the outlines for each topic.
- Thu Oct 10, 2019 12:16 am
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 7692
Re: Week 2 Homework Problems [ENDORSED]
Does anyone know if we will be on the quantum topic for more than just one week? I just want to know if the homework set for quantum will be used for both weeks 3 and 4. Thanks!
- Thu Oct 10, 2019 12:08 am
- Forum: Limiting Reactant Calculations
- Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
- Replies: 68
- Views: 6971
Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Because each question is worth so many points, it would be wise to show at least the basic steps that you used to get to your solution.
- Mon Oct 07, 2019 11:38 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 363479
Re: Final Jitters
What works for me is to study the concepts that I struggle with, just look over the ones I know just to make sure I have them down, but not to psych myself out studying until the last minute. I tend to overstudy, and I've learned over the years that if I take the time just before a test to just rela...
- Thu Oct 03, 2019 9:12 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Help on HW: Fundamentals G5
- Replies: 3
- Views: 332
Re: Help on HW: Fundamentals G5
I would start by using the equation for molarity and go from there: Molarity = number of mols/volume for part a, we can find the numbers of mols of Na2CO3 by taking 2.111 grams and dividing it by the molar mass of Na2CO3, which is about 106. Hence, we get 2.111/106 = 0.01992 mol Na2CO3. To find the...
- Thu Oct 03, 2019 1:31 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Solving for Volume G.5 a)
- Replies: 8
- Views: 584
Re: Solving for Volume G.5 a)
So this problem is asking us to determine the volume of the solution should be transferred into a flask in order to obtain 2.15 mmol of Na+ . Importantly, this is not a dilution problem. Therefore, we won't be using the M1V1=M2V2 equation. The molarity of the solution won't be changing when we tran...
- Thu Oct 03, 2019 1:04 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Help on HW: Fundamentals G5
- Replies: 3
- Views: 332
Help on HW: Fundamentals G5
Could someone please help me solve this problem? I got as far as converting 2.111g to moles (.020 mol) and finding the molarity (.8 mol.L-1). I don't know how to solve the rest. Thank you! (p. F58) G.5 A student prepared a solution of sodium carbonate by adding 2.111 g of the solid to a 250.0-mL vol...