Search found 107 matches
- Thu Mar 12, 2020 8:25 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Topics
- Replies: 10
- Views: 774
Re: Final Topics
It is cumulative, so everything is fair game.
- Thu Mar 12, 2020 8:23 pm
- Forum: General Science Questions
- Topic: Who makes the Final
- Replies: 23
- Views: 1307
Re: Who makes the Final
The TAs do not even see the final before its released. It is all created by professor Lavelle
- Wed Mar 11, 2020 1:20 am
- Forum: Student Social/Study Group
- Topic: Final Exam
- Replies: 22
- Views: 1485
Re: Final Exam
Clara Cho 2K wrote:Do you think we will still meet for discussion?
No discussions or classes of any sort will meet in person!
- Tue Mar 10, 2020 12:39 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: deltaG at equilibrium
- Replies: 8
- Views: 680
deltaG at equilibrium
At equilibrium does deltaG=0? If so why? Thank you!
- Mon Mar 09, 2020 2:59 pm
- Forum: Environment, Ozone, CFCs
- Topic: stoichiometric coefficients
- Replies: 19
- Views: 1379
Re: stoichiometric coefficients
the reaction is correct either way. You can multiply by 2 if you want.
- Sun Mar 08, 2020 9:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Material Distribution
- Replies: 6
- Views: 387
Re: Final Exam Material Distribution
it could possibly be heavy on thermodynamics and kinetics. That would be my guess. We were heavily tested on acids and bases already on the midterm.
- Sun Mar 08, 2020 4:32 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Rate Laws
- Replies: 3
- Views: 256
Rate Laws
Do we include liquids like H20 in our rate laws? Or does the concentration of H20 not matter for the rate law? thank you
- Sat Mar 07, 2020 4:26 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Pre-equilibrium help
- Replies: 1
- Views: 248
Pre-equilibrium help
Hello, I was wondering if anyone knew any helpful links to help understand pre-equilibrium that was mentioned in the text book 7C.3 and in lecture this Friday. How do we go about solving these questions??
- Sat Mar 07, 2020 3:56 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: the intermediate in a reaction
- Replies: 10
- Views: 669
the intermediate in a reaction
Can an intermediate always be in the rate law expression? Or is there certain instances where it cannot be placed in the rate law expression and has to be replaced with something other. Thank you !
- Sat Mar 07, 2020 1:21 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Rate-Limiting Step
- Replies: 5
- Views: 328
Re: Rate-Limiting Step
the rate limiting step, is the step that matches the rate law that was originally given. That would be your slow step.
- Thu Mar 05, 2020 11:41 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Reducing/Oxidizing agents
- Replies: 5
- Views: 351
Reducing/Oxidizing agents
What does it mean to be a reducing or oxidizing reagent? I am also having problem understanding this true or false question: " A reaction with a negative standard reduction potential favors oxidation of the reactant" it is true. What does it mean to have a 'negative standard reduction pote...
- Sun Mar 01, 2020 9:45 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst Equation
- Replies: 4
- Views: 337
Re: Nernst Equation
The Nernst equation, can be used for various things in electrochemistry. It can be used to calculate the concentration of a substance, maybe the pH, the cell potential, standard cell potential etc... However, i think the dead give away would be when they give you concentrations and/or pH's.
- Sun Mar 01, 2020 9:40 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: spontaneity
- Replies: 39
- Views: 1769
Re: spontaneity
Gibbs free energy under conditions of constant temperature and pressure! your delta G must be negative because that is the energy free to do work!
- Sun Mar 01, 2020 9:38 pm
- Forum: General Science Questions
- Topic: Test 2
- Replies: 16
- Views: 933
Re: Test 2
Test 2 will cover all of electrochemistry and the second page of thermodynamics.
- Sun Mar 01, 2020 9:38 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Kelvin or Celsius?
- Replies: 86
- Views: 5003
Re: Kelvin or Celsius?
you must use Kelvin because of the units in the gas constant R
- Sun Mar 01, 2020 9:36 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: when to use K or Q
- Replies: 18
- Views: 1041
Re: when to use K or Q
you should use K when the problem is at equilibrium, and Q when the problem is not specifically indicated to be at equilibrium.
- Sun Mar 01, 2020 9:34 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Salt Bridge
- Replies: 12
- Views: 615
Re: Salt Bridge
The salt bridge is there to balance out the charges to keep the electron flow moving within the cell.
- Sun Mar 01, 2020 9:28 pm
- Forum: Balancing Redox Reactions
- Topic: Cell Diagrams
- Replies: 14
- Views: 902
Re: Cell Diagrams
When working with a cell diagram, the left must have the anode (oxidation) and the right must have the cathode (reduction).
- Sun Feb 23, 2020 8:42 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst Equation for Concentration Cells
- Replies: 2
- Views: 186
Re: Nernst Equation for Concentration Cells
yes the solutions manual is correct. Make sure you are doubt checking your negatives. When you take the ln of your concentrations it should be a negative value. Then you should multiply that negative value with (-RT/nF) which makes a positive .
- Sun Feb 23, 2020 5:46 pm
- Forum: General Science Questions
- Topic: Organic Chemistry Tutor?
- Replies: 6
- Views: 1910
Re: Organic Chemistry Tutor?
Specifically which videos from Dr. Lavelles website did you watch for help? Thank you
- Sun Feb 23, 2020 5:45 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Calculating Cell Potentials
- Replies: 2
- Views: 194
Re: Calculating Cell Potentials
another way you can think about it, that is personally easier for me is to use: Ereduction + Eoxidation = Ecell
- Thu Feb 20, 2020 10:32 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: homework question 6L.7 part A [ENDORSED]
- Replies: 1
- Views: 166
homework question 6L.7 part A [ENDORSED]
Hello everyone, I have a question on part A of this question because I do not exactly know what to do with redox reactions when they are at equilibrium. Are there specific rules? Or strategies when doing these? Thank you!
- Tue Feb 18, 2020 7:37 pm
- Forum: Balancing Redox Reactions
- Topic: Redox Reactions
- Replies: 2
- Views: 230
Re: Redox Reactions
An oxidizing agent is the substance that causes the oxidation in another substance. Common oxidizing agents include oxygen, hydrogen peroxide and halogens. A reducing agent is a substance that causes another substance to reduce. So to identify an oxidizing agent, simply look at the oxidation number...
- Tue Feb 18, 2020 7:28 pm
- Forum: Balancing Redox Reactions
- Topic: Redox Reactions
- Replies: 2
- Views: 230
Redox Reactions
how do you identify in redox reactions the reducing and oxidized reagents? I having trouble with this, does anyone have any tips?
- Tue Feb 18, 2020 7:24 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing half reactions
- Replies: 11
- Views: 626
Re: Balancing half reactions
Yes you should be able to cancel out the electrons when you combine both half equations.
- Mon Feb 17, 2020 11:22 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Homework question 5G.13
- Replies: 2
- Views: 194
Homework question 5G.13
I had a question regarding when a reaction is spontaneous or not. I thought a reaction is only spontaneous when deltaG is negative. However in this question deltaG is positive and the solutions manual says it is spontaneous. Is there any exceptions to when a reaction is spontaneous or not ? Thank you.
- Mon Feb 17, 2020 11:43 am
- Forum: Administrative Questions and Class Announcements
- Topic: Step Up Sessions
- Replies: 71
- Views: 6431
Re: Step Up Sessions
GFolk_1D wrote:Hi! Will there still be UA review sessions today despite the holiday?
Because of the holiday there will not be a UA session this week!
- Tue Feb 11, 2020 5:53 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: Homework 4G.3
- Replies: 2
- Views: 90
Re: Homework 4G.3
Hi! To answer your question, when we talk about which molecule has more positional or residual entropy we have to take into account of how many microstates the molecule can take because molecules that have more microstates will have more positional entropy. When comparing these two molecules it is ...
- Mon Feb 10, 2020 11:50 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: Homework 4G.3
- Replies: 2
- Views: 90
Homework 4G.3
Hello everyone, I have a question on this specific homework problem. I do not get exactly why COF2 can be more disordered compared to BF3 just because of the different atoms it composes. It there a real explanation for this ?
- Mon Feb 10, 2020 9:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Correct Calculator for Midterm
- Replies: 2
- Views: 290
Re: Correct Calculator for Midterm
Yes the calculator should be fine!
- Sat Feb 08, 2020 1:10 am
- Forum: Phase Changes & Related Calculations
- Topic: Homework Problem 4C.13
- Replies: 3
- Views: 163
Homework Problem 4C.13
For this question, I am confused on why you add the the energy to melt the ice into the MCAT equation? I've never seen a question use this concept and just confused on it.
- Sat Feb 08, 2020 1:06 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: 4C.3
- Replies: 1
- Views: 123
Re: 4C.3
for both parts you want to use q=ncAT. However, since the question says to treat it as an ideal gas, for the heat capacities the calculation will be different. For part a: for C you calculate it using c=(5/2*R). While for part b, you have to use c=(3/2*R). R being equal to 8.314
- Tue Feb 04, 2020 1:25 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 6
- Views: 305
Re: Midterm
I would check the constants and equations sheet from your previous test 1, that is what you will receive on the midterm. So whatever that is not on there will be what you have to memorize. I would make sure to know everything from lecture and the homework.
- Thu Jan 30, 2020 6:29 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Work done by expansion
- Replies: 8
- Views: 128
Re: Work done by expansion
Zoya Mulji 1K wrote:Did we go over the equation for work done by expansion when P is not constant? Is that the same work equation with the integral included?
I am pretty sure we have not went over that.
- Thu Jan 30, 2020 6:27 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Homework question 4B.13
- Replies: 5
- Views: 246
Homework question 4B.13
for part B of this homework question, I keep calculating a different answer than what is on the solutions manual. For my calculation for work i am getting W= -3.18 , while the solutions manual is w= -326. I do not get why that is the solution on the manual if all our work is the same. Is this an err...
- Wed Jan 29, 2020 9:12 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: HW 4A.5
- Replies: 1
- Views: 92
HW 4A.5
On this specific homework question, the questions compares two final work values and asks which one is doing more work.
One answer was w=-122 and the other was w=-344. Why is the answer that is more negative (-344) doing more work? Even though it is a more negative answer?
One answer was w=-122 and the other was w=-344. Why is the answer that is more negative (-344) doing more work? Even though it is a more negative answer?
- Sun Jan 26, 2020 10:19 pm
- Forum: Phase Changes & Related Calculations
- Topic: Enthalpy
- Replies: 5
- Views: 160
Re: Enthalpy
It is because Enthalpy only depends on initial and final values which make the reaction a state function.
- Sun Jan 26, 2020 10:16 pm
- Forum: Ideal Gases
- Topic: Kc vs Kp
- Replies: 109
- Views: 4271
Re: Kc vs Kp
Kp is used with partial pressures like gases such as ATM. But Kc is used when you have things like aq concentrations.
- Sun Jan 26, 2020 10:15 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Midterm
- Replies: 8
- Views: 296
Re: Midterm
It will take place week 6. February 12th
- Sun Jan 26, 2020 10:14 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Ka and Kb
- Replies: 10
- Views: 464
Re: Ka and Kb
Ka and Kb values can also be given to strong acids and bases they will just be excessively big I think
- Sun Jan 26, 2020 10:10 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Week 4 Homework
- Replies: 11
- Views: 274
Re: Week 4 Homework
We wil be covering Outline 4, so I am sure anything from that section would be okay!
- Sun Jan 26, 2020 10:09 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: exo thermic
- Replies: 11
- Views: 334
Re: exo thermic
Exothermic indicates that the heat is in the products, and you can treat heat as a molecule in a sense. So if the heat is increased then you can see that the reaction will shift to the left
- Sun Jan 26, 2020 10:08 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: H2O as a Gas
- Replies: 69
- Views: 6050
Re: H2O as a Gas
Within your ICE table, you should only include aq solutions and gases. If H2O is presented as a gas then you should still put it in the ICE table.
- Sun Jan 26, 2020 10:05 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Gas Constant
- Replies: 13
- Views: 503
Re: Gas Constant
Every question can possibly be different, so you can necessarily pinpoint down one equation. It just depends on the question and units.
- Sun Jan 26, 2020 10:03 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE BOX
- Replies: 27
- Views: 717
Re: ICE BOX
when your K value is less than 10^-3 you can assume that it is too small to affect your concentration.
- Mon Jan 20, 2020 10:17 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: homework problem 6D.3
- Replies: 2
- Views: 129
Re: homework problem 6D.3
I wondered the same thing. I just thought the solutions manual to be wrong and wrote the equation as HClO2 + H2O ⇌ ClO2 + H3O+ After this, I calculated the concentration of H3O+ from the pH value. Now I'm trying to solve for the Ka but I was wondering, is 0.10 M of HClO the equilibrium concentratio...
- Mon Jan 20, 2020 9:41 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: homework problem 6D.3
- Replies: 2
- Views: 129
homework problem 6D.3
This question has created some confusion for me just now. HClO2 is a weak acid however, it seems to completely ionize in the solutions manual. A weak acid should contain a reverse reaction correct? Can somebody please explain why this question is worked out this way?
- Mon Jan 20, 2020 2:00 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Weak acids & bases
- Replies: 7
- Views: 296
Re: Weak acids & bases
you would get the ((change in concentration)/(initial concentration) )x100% and that is how you calculate it.
- Mon Jan 20, 2020 1:55 pm
- Forum: General Science Questions
- Topic: Buffers
- Replies: 2
- Views: 119
Re: Buffers
A buffer solution is a reaction with contains a weak acid and its conjugate weak base in a reaction, as far as how much do we need to know about them? I am not exactly sure. I would check the learning outcomes on the website.
- Mon Jan 20, 2020 1:53 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Pressure changes
- Replies: 5
- Views: 195
Re: Pressure changes
If the moles are the same, then there will be no shift in the reaction.
- Mon Jan 20, 2020 1:52 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Workshop Monday
- Replies: 2
- Views: 131
Re: Workshop Monday
Last Monday's session Lyndon said he will not be having his session today due to the holiday.
- Mon Jan 20, 2020 1:50 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: 5% Rule
- Replies: 6
- Views: 317
Re: 5% Rule
Yes, the 5% rule applies to both acid and base and chemical equilibria. They are essentially the same process.
- Tue Jan 14, 2020 6:59 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE Table
- Replies: 8
- Views: 249
Re: ICE Table
yes! just make sure everything is in SI units and they are all the SAME. ICE tables are so useful.
- Tue Jan 14, 2020 6:58 pm
- Forum: Student Social/Study Group
- Topic: Peer Learning Sessions in Young Hall
- Replies: 5
- Views: 296
Re: Peer Learning Sessions in Young Hall
Lavelle will post the young hall peer learning session on the website when they are ready. They'll probably cover recent material, it just depends on the UA!
- Tue Jan 14, 2020 6:56 pm
- Forum: General Science Questions
- Topic: Test 1 [ENDORSED]
- Replies: 13
- Views: 436
Re: Test 1 [ENDORSED]
It will be during week 3 in discussion, Lavelle will probably go over everything that will be on the quiz friday in lecture.
- Tue Jan 14, 2020 6:51 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 1
- Replies: 7
- Views: 192
Re: Test 1
Most likely on friday professor will let us know everything we need to know for test 1.
- Tue Jan 14, 2020 6:31 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Reaction Quotient Units
- Replies: 10
- Views: 255
Re: Reaction Quotient Units
Q will also be unitless since it is calculated the same way as K. Just make sure you are using the correct units for molarity.
- Tue Dec 03, 2019 8:07 pm
- Forum: Bronsted Acids & Bases
- Topic: CaO
- Replies: 10
- Views: 1470
CaO
I know CaO is a base, however is it a strong or weak base?
- Sun Dec 01, 2019 6:41 pm
- Forum: Naming
- Topic: Naming an Anion
- Replies: 2
- Views: 180
Re: Naming an Anion
You just have to assume the charges of the molecules or atoms. For cyanide you have to know that the charge is negative one so you would add the "O". Chlorine most likely also has a negative one charge. You have to learn these charges it is not really specifically given.
- Sun Dec 01, 2019 6:31 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Relative acidity
- Replies: 7
- Views: 493
Re: Relative acidity
Im pretty sure that has to do with the size difference between F and I. HI is a much bigger molecule than HF which leads to it being more acidic.
- Sun Dec 01, 2019 2:12 pm
- Forum: Bronsted Acids & Bases
- Topic: What do we need to know?
- Replies: 2
- Views: 130
Re: What do we need to know?
I would just depend on the homework problems. Get all of them down and then begin asking your TA for a more specific layout of what you need to know. Homework problems are really helpful.
- Sun Dec 01, 2019 12:35 pm
- Forum: Hybridization
- Topic: drawing out hybridization diagrams
- Replies: 1
- Views: 133
drawing out hybridization diagrams
For the final, would it be necessary to know how to draw out the hybridization diagrams?
- Sun Dec 01, 2019 12:32 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Monodentate and Bidentate Ligands
- Replies: 2
- Views: 308
Re: Monodentate and Bidentate Ligands
How I look at it when i am determining such things like monodentate or polydentate is the charges. On CO3^2- there are two oxygens with a negative charge and one without. Therefore, there can either be two places for a transition metal to attach since they are both negatively charged. Or the transit...
- Mon Nov 25, 2019 11:05 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: anionic ligands
- Replies: 1
- Views: 125
anionic ligands
I was wondering what the chemical formula for ethylenediaminetetraacetato (edta) would be?
- Sun Nov 24, 2019 4:54 pm
- Forum: Naming
- Topic: coordination compounds
- Replies: 4
- Views: 217
Re: coordination compounds
305416361 wrote:I think either one is fine, since we were taught both
Sounds good! Thanks
- Sun Nov 24, 2019 4:54 pm
- Forum: Naming
- Topic: coordination compounds
- Replies: 4
- Views: 217
- Sun Nov 24, 2019 4:15 pm
- Forum: Naming
- Topic: coordination compounds
- Replies: 4
- Views: 217
coordination compounds
When naming coordination compounds, do we use the original names or the new "IUPAC" convention naming?
- Sat Nov 23, 2019 4:51 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final exam
- Replies: 17
- Views: 835
Re: Final exam
yes . Everything from week 1-10.
- Sat Nov 23, 2019 4:49 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: IMF [ENDORSED]
- Replies: 6
- Views: 888
Re: IMF [ENDORSED]
These "induced-dipoles" are referring to the repulsions of the electrons in an element. They are instantaneous and all always happening . It is the weakest IMF but is involved with every element.
- Sat Nov 23, 2019 4:45 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: 3F 15
- Replies: 5
- Views: 896
Re: 3F 15
Dipole- Dipole is a stronger IMF than LDF so that is why AsF3 has the higher boiling point. Yes AsF5 has higher LDF but it does not matter due to the Dipole-Dipole.
- Sat Nov 23, 2019 4:40 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lecture on 11/27
- Replies: 4
- Views: 315
Re: Lecture on 11/27
Yes, we will be having lecture . Doctor Lavelle sent an email about it a couple days ago.
- Sat Nov 16, 2019 10:20 pm
- Forum: Bond Lengths & Energies
- Topic: Test 2 Topics
- Replies: 40
- Views: 1989
Re: Test 2 Topics
Elizabeth Johnson 1I wrote:105311039 wrote:It will cover material from the midterm and on!
ah wait so are you saying that the material on the midterm is fair game?
No, sorry like material from after the midterm and on!
- Sat Nov 16, 2019 10:16 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: What is VSPER
- Replies: 14
- Views: 916
Re: What is VSPER
VSEPR stands for Valence Shell Electron Pair Repulsion theory. I do not think we need to memorize it but it would not hurt to actually know it.
- Sat Nov 16, 2019 10:13 pm
- Forum: Hybridization
- Topic: test 2
- Replies: 8
- Views: 438
Re: test 2
Hybridization is not on test #2 however, sigma and pi bonds are!
- Sat Nov 16, 2019 10:10 pm
- Forum: General Science Questions
- Topic: Midterm
- Replies: 7
- Views: 499
Re: Midterm
TAs would be the best to head to first!
- Sat Nov 16, 2019 10:08 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: How to treat Radicals
- Replies: 5
- Views: 274
Re: How to treat Radicals
Yes it should be treated as a whole region of electron density. It would still cause repulsion, however, I do not think it would be the same amount as a complete lone pair.
- Sat Nov 16, 2019 10:05 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent and Angular?
- Replies: 6
- Views: 330
Re: Bent and Angular?
Yes they are the same thing! However, Professor Lavelle uses Bent so I would stick to that!
- Sun Nov 10, 2019 10:16 pm
- Forum: Lewis Structures
- Topic: Lewis Dot Structures
- Replies: 7
- Views: 355
Re: Lewis Dot Structures
I do not think for now it matters what side the single electron goes on since we have not discussed shape yet.
- Sun Nov 10, 2019 10:13 pm
- Forum: Resonance Structures
- Topic: Drawing Resonance Structures
- Replies: 3
- Views: 239
Re: Drawing Resonance Structures
Yes! Draw every possibility of the bond. However, there will always be one "best" structure!
- Sun Nov 10, 2019 10:11 pm
- Forum: Lewis Structures
- Topic: Midterm grades
- Replies: 26
- Views: 1306
Re: Midterm grades
In lecture on friday, Lavelle said that we will get it back on wednesday!
- Sun Nov 10, 2019 10:06 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: The exceptions
- Replies: 6
- Views: 369
Re: The exceptions
The two exceptions are copper and chromium, the rest of the group under those two elements.
- Sun Nov 10, 2019 10:04 pm
- Forum: Dipole Moments
- Topic: Dipole moments
- Replies: 3
- Views: 201
Re: Dipole moments
Dipole occurs when two atoms are bonded, and they have a large difference in electronegativity. The most electronegative atom will pull the electrons more to one side of the bond causing a "dipole".
- Sun Nov 10, 2019 10:01 pm
- Forum: Bond Lengths & Energies
- Topic: Test 2 Topics
- Replies: 40
- Views: 1989
Re: Test 2 Topics
It will cover material from the midterm and on!
- Sun Nov 03, 2019 10:38 pm
- Forum: Resonance Structures
- Topic: Including resonance structures
- Replies: 2
- Views: 167
Re: Including resonance structures
I think they will specifically ask for resonance structures when they want them.
- Sun Nov 03, 2019 10:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterms
- Replies: 6
- Views: 380
Re: Midterms
Yes, 1 midterm and we will have another test and a final.
- Sun Nov 03, 2019 10:33 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: formal charge
- Replies: 5
- Views: 344
Re: formal charge
Formal charge helps you determine whether you have drawn the best structure possible, but you should not have to necessarily write it out unless it is asked.
- Sun Nov 03, 2019 10:30 pm
- Forum: Bond Lengths & Energies
- Topic: Why Are Double Bonds Shorter
- Replies: 16
- Views: 5928
Re: Why Are Double Bonds Shorter
Double bonds are closer because they have a stronger bond, so they pull the elements closer together.
- Sun Oct 27, 2019 10:14 pm
- Forum: Ionic & Covalent Bonds
- Topic: electron configuration
- Replies: 5
- Views: 180
Re: electron configuration
It is more stable to have 10 electrons in the D orbital, rather than 9 in the D orbital and 2 in the S orbital, therefore you move one electron to the D orbital to make it as stable as possible.
- Sun Oct 27, 2019 10:11 pm
- Forum: Ionic & Covalent Bonds
- Topic: Homework
- Replies: 13
- Views: 589
Re: Homework
Both sections for this week should be okay!
- Mon Oct 21, 2019 4:17 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Homework Question 1E.9
- Replies: 3
- Views: 150
Re: Homework Question 1E.9
Can someone explain to me why the quantum numbers for 1E.9 part B are not possible? I understand part A and C, but something about B is really throwing me off. Thanks so much! - For this question 1e.9 part B is not possible because of if the Ml value. Since l is equal to 0, Ml can only also equal 0...
- Mon Oct 21, 2019 4:10 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 1D. 23
- Replies: 4
- Views: 248
Re: 1D. 23
How many orbitals can have the following quantum numbers in an atom: (a) n=2, l=1 (b) n=4, l=2, ml= -2 (c) n=2 (d) n=3, l=2, ml= +1? For (b) and (c), how does the magnetic quantum number tell you how many orbitals there are? I don't understand how to find the number of orbitals with ml. -Ml specifi...
- Mon Oct 21, 2019 4:00 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Electron spin
- Replies: 5
- Views: 160
Re: Electron spin
The electron spin is all determined by the quantum number Ms. There are two possible values for Ms which are 1/2 and -1/2. If Ms=1/2 then the electron is spinning upward, however if the Ms value is -1/2 the electron is spinning downward.
- Mon Oct 21, 2019 3:53 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Are electrons always removed from the 4s orbital before the 3d orbital?
- Replies: 6
- Views: 555
!
Yes! The 4s electrons are removed before the 3d electrons!
- Mon Oct 21, 2019 1:24 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Spin and orbitals
- Replies: 4
- Views: 108
Re: Spin and orbitals
This is due to Hund's rule, which was mentioned by Dr. Lavelle in lecture.
- Mon Oct 21, 2019 1:21 pm
- Forum: Trends in The Periodic Table
- Topic: Atomic Radius
- Replies: 7
- Views: 422
Re: Atomic Radius
Its the distance between two touching atoms and their nuclei.
- Mon Oct 21, 2019 1:16 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Spin
- Replies: 5
- Views: 288
Re: Electron Spin
There can only be two electron spins, which depends on the Ms quantum number.
- Mon Oct 21, 2019 1:14 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: What's the right equation?
- Replies: 7
- Views: 225
Re: What's the right equation?
It should be the first equation!
- Sun Oct 13, 2019 1:54 pm
- Forum: Properties of Light
- Topic: 1A3
- Replies: 5
- Views: 170
Re: 1A3
Yes! The speed of light is constant! And will never change.
- Sun Oct 13, 2019 1:52 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: First Test Result
- Replies: 5
- Views: 263
Re: First Test Result
Possibly in your discussion this week!
- Sun Oct 13, 2019 1:48 pm
- Forum: Photoelectric Effect
- Topic: Video Modules
- Replies: 7
- Views: 292
Re: Video Modules
Yes, its recommended to watch them, but not required!