Search found 107 matches

by 105311039
Thu Mar 12, 2020 8:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Topics
Replies: 10
Views: 88

Re: Final Topics

It is cumulative, so everything is fair game.
by 105311039
Thu Mar 12, 2020 8:23 pm
Forum: General Science Questions
Topic: Who makes the Final
Replies: 23
Views: 296

Re: Who makes the Final

The TAs do not even see the final before its released. It is all created by professor Lavelle
by 105311039
Wed Mar 11, 2020 1:20 am
Forum: Student Social/Study Group
Topic: Final Exam
Replies: 22
Views: 469

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!
by 105311039
Tue Mar 10, 2020 12:39 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: deltaG at equilibrium
Replies: 8
Views: 143

deltaG at equilibrium

At equilibrium does deltaG=0? If so why? Thank you!
by 105311039
Mon Mar 09, 2020 2:59 pm
Forum: Environment, Ozone, CFCs
Topic: stoichiometric coefficients
Replies: 9
Views: 69

Re: stoichiometric coefficients

the reaction is correct either way. You can multiply by 2 if you want.
by 105311039
Sun Mar 08, 2020 9:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam Material Distribution
Replies: 6
Views: 57

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.
by 105311039
Sun Mar 08, 2020 4:32 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate Laws
Replies: 3
Views: 21

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
by 105311039
Sat Mar 07, 2020 4:26 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Pre-equilibrium help
Replies: 1
Views: 67

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??
by 105311039
Sat Mar 07, 2020 3:56 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: the intermediate in a reaction
Replies: 10
Views: 126

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 !
by 105311039
Sat Mar 07, 2020 1:21 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate-Limiting Step
Replies: 5
Views: 60

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.
by 105311039
Thu Mar 05, 2020 11:41 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Reducing/Oxidizing agents
Replies: 5
Views: 63

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...
by 105311039
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: 40

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.
by 105311039
Sun Mar 01, 2020 9:40 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: spontaneity
Replies: 34
Views: 499

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!
by 105311039
Sun Mar 01, 2020 9:38 pm
Forum: General Science Questions
Topic: Test 2
Replies: 16
Views: 256

Re: Test 2

Test 2 will cover all of electrochemistry and the second page of thermodynamics.
by 105311039
Sun Mar 01, 2020 9:38 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Kelvin or Celsius?
Replies: 47
Views: 836

Re: Kelvin or Celsius?

you must use Kelvin because of the units in the gas constant R
by 105311039
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: 149

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.
by 105311039
Sun Mar 01, 2020 9:34 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge
Replies: 12
Views: 86

Re: Salt Bridge

The salt bridge is there to balance out the charges to keep the electron flow moving within the cell.
by 105311039
Sun Mar 01, 2020 9:28 pm
Forum: Balancing Redox Reactions
Topic: Cell Diagrams
Replies: 14
Views: 84

Re: Cell Diagrams

When working with a cell diagram, the left must have the anode (oxidation) and the right must have the cathode (reduction).
by 105311039
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: 38

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 .
by 105311039
Sun Feb 23, 2020 5:46 pm
Forum: General Science Questions
Topic: Organic Chemistry Tutor?
Replies: 6
Views: 82

Re: Organic Chemistry Tutor?

Specifically which videos from Dr. Lavelles website did you watch for help? Thank you
by 105311039
Sun Feb 23, 2020 5:45 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Calculating Cell Potentials
Replies: 2
Views: 18

Re: Calculating Cell Potentials

another way you can think about it, that is personally easier for me is to use: Ereduction + Eoxidation = Ecell
by 105311039
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: 57

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!
by 105311039
Tue Feb 18, 2020 7:37 pm
Forum: Balancing Redox Reactions
Topic: Redox Reactions
Replies: 2
Views: 28

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...
by 105311039
Tue Feb 18, 2020 7:28 pm
Forum: Balancing Redox Reactions
Topic: Redox Reactions
Replies: 2
Views: 28

Redox Reactions

how do you identify in redox reactions the reducing and oxidized reagents? I having trouble with this, does anyone have any tips?
by 105311039
Tue Feb 18, 2020 7:24 pm
Forum: Balancing Redox Reactions
Topic: Balancing half reactions
Replies: 11
Views: 75

Re: Balancing half reactions

Yes you should be able to cancel out the electrons when you combine both half equations.
by 105311039
Mon Feb 17, 2020 11:22 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Homework question 5G.13
Replies: 2
Views: 39

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.
by 105311039
Mon Feb 17, 2020 11:43 am
Forum: Administrative Questions and Class Announcements
Topic: Step Up Sessions
Replies: 15
Views: 3010

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!
by 105311039
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: 33

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 ...
by 105311039
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: 33

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 ?
by 105311039
Mon Feb 10, 2020 9:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Correct Calculator for Midterm
Replies: 2
Views: 109

Re: Correct Calculator for Midterm

Yes the calculator should be fine!
by 105311039
Sat Feb 08, 2020 1:10 am
Forum: Phase Changes & Related Calculations
Topic: Homework Problem 4C.13
Replies: 3
Views: 41

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.
by 105311039
Sat Feb 08, 2020 1:06 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 4C.3
Replies: 1
Views: 31

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
by 105311039
Tue Feb 04, 2020 1:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 6
Views: 60

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.
by 105311039
Thu Jan 30, 2020 6:29 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Work done by expansion
Replies: 8
Views: 60

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.
by 105311039
Thu Jan 30, 2020 6:27 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Homework question 4B.13
Replies: 2
Views: 36

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...
by 105311039
Wed Jan 29, 2020 9:12 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: HW 4A.5
Replies: 1
Views: 23

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?
by 105311039
Sun Jan 26, 2020 10:19 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy
Replies: 5
Views: 54

Re: Enthalpy

It is because Enthalpy only depends on initial and final values which make the reaction a state function.
by 105311039
Sun Jan 26, 2020 10:16 pm
Forum: Ideal Gases
Topic: Kc vs Kp
Replies: 43
Views: 453

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.
by 105311039
Sun Jan 26, 2020 10:15 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Midterm
Replies: 8
Views: 89

Re: Midterm

It will take place week 6. February 12th
by 105311039
Sun Jan 26, 2020 10:14 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Ka and Kb
Replies: 10
Views: 111

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
by 105311039
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: 98

Re: Week 4 Homework

We wil be covering Outline 4, so I am sure anything from that section would be okay!
by 105311039
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: 143

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
by 105311039
Sun Jan 26, 2020 10:08 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: H2O as a Gas
Replies: 12
Views: 159

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.
by 105311039
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: 79

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.
by 105311039
Sun Jan 26, 2020 10:03 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE BOX
Replies: 27
Views: 221

Re: ICE BOX

when your K value is less than 10^-3 you can assume that it is too small to affect your concentration.
by 105311039
Mon Jan 20, 2020 10:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: homework problem 6D.3
Replies: 2
Views: 41

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...
by 105311039
Mon Jan 20, 2020 9:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: homework problem 6D.3
Replies: 2
Views: 41

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?
by 105311039
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: 56

Re: Weak acids & bases

you would get the ((change in concentration)/(initial concentration) )x100% and that is how you calculate it.
by 105311039
Mon Jan 20, 2020 1:55 pm
Forum: General Science Questions
Topic: Buffers
Replies: 2
Views: 41

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.
by 105311039
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: 30

Re: Pressure changes

If the moles are the same, then there will be no shift in the reaction.
by 105311039
Mon Jan 20, 2020 1:52 pm
Forum: Administrative Questions and Class Announcements
Topic: Workshop Monday
Replies: 2
Views: 72

Re: Workshop Monday

Last Monday's session Lyndon said he will not be having his session today due to the holiday.
by 105311039
Mon Jan 20, 2020 1:50 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 5% Rule
Replies: 6
Views: 51

Re: 5% Rule

Yes, the 5% rule applies to both acid and base and chemical equilibria. They are essentially the same process.
by 105311039
Tue Jan 14, 2020 6:59 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Table
Replies: 8
Views: 79

Re: ICE Table

yes! just make sure everything is in SI units and they are all the SAME. ICE tables are so useful.
by 105311039
Tue Jan 14, 2020 6:58 pm
Forum: Student Social/Study Group
Topic: Peer Learning Sessions in Young Hall
Replies: 5
Views: 79

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!
by 105311039
Tue Jan 14, 2020 6:56 pm
Forum: General Science Questions
Topic: Test 1 [ENDORSED]
Replies: 13
Views: 159

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.
by 105311039
Tue Jan 14, 2020 6:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 1
Replies: 7
Views: 83

Re: Test 1

Most likely on friday professor will let us know everything we need to know for test 1.
by 105311039
Tue Jan 14, 2020 6:31 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Quotient Units
Replies: 10
Views: 56

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.
by 105311039
Tue Dec 03, 2019 8:07 pm
Forum: Bronsted Acids & Bases
Topic: CaO
Replies: 10
Views: 105

CaO

I know CaO is a base, however is it a strong or weak base?
by 105311039
Sun Dec 01, 2019 6:41 pm
Forum: Naming
Topic: Naming an Anion
Replies: 2
Views: 32

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.
by 105311039
Sun Dec 01, 2019 6:31 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Relative acidity
Replies: 7
Views: 132

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.
by 105311039
Sun Dec 01, 2019 2:12 pm
Forum: Bronsted Acids & Bases
Topic: What do we need to know?
Replies: 2
Views: 53

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.
by 105311039
Sun Dec 01, 2019 12:35 pm
Forum: Hybridization
Topic: drawing out hybridization diagrams
Replies: 1
Views: 39

drawing out hybridization diagrams

For the final, would it be necessary to know how to draw out the hybridization diagrams?
by 105311039
Sun Dec 01, 2019 12:32 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Monodentate and Bidentate Ligands
Replies: 2
Views: 34

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...
by 105311039
Mon Nov 25, 2019 11:05 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: anionic ligands
Replies: 1
Views: 26

anionic ligands

I was wondering what the chemical formula for ethylenediaminetetraacetato (edta) would be?
by 105311039
Sun Nov 24, 2019 4:54 pm
Forum: Naming
Topic: coordination compounds
Replies: 4
Views: 37

Re: coordination compounds

305416361 wrote:I think either one is fine, since we were taught both

Sounds good! Thanks
by 105311039
Sun Nov 24, 2019 4:54 pm
Forum: Naming
Topic: coordination compounds
Replies: 4
Views: 37

gbernal1C wrote:Lavelle said to use the one that has the asterisk next to it but he also said in his email that either or is fine.

Thank you!
by 105311039
Sun Nov 24, 2019 4:15 pm
Forum: Naming
Topic: coordination compounds
Replies: 4
Views: 37

coordination compounds

When naming coordination compounds, do we use the original names or the new "IUPAC" convention naming?
by 105311039
Sat Nov 23, 2019 4:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Final exam
Replies: 17
Views: 264

Re: Final exam

yes . Everything from week 1-10.
by 105311039
Sat Nov 23, 2019 4:49 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: IMF [ENDORSED]
Replies: 6
Views: 416

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.
by 105311039
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: 107

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.
by 105311039
Sat Nov 23, 2019 4:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Lecture on 11/27
Replies: 4
Views: 62

Re: Lecture on 11/27

Yes, we will be having lecture . Doctor Lavelle sent an email about it a couple days ago.
by 105311039
Sat Nov 16, 2019 10:20 pm
Forum: Bond Lengths & Energies
Topic: Test 2 Topics
Replies: 40
Views: 731

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!
by 105311039
Sat Nov 16, 2019 10:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: What is VSPER
Replies: 14
Views: 234

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.
by 105311039
Sat Nov 16, 2019 10:13 pm
Forum: Hybridization
Topic: test 2
Replies: 8
Views: 86

Re: test 2

Hybridization is not on test #2 however, sigma and pi bonds are!
by 105311039
Sat Nov 16, 2019 10:10 pm
Forum: General Science Questions
Topic: Midterm
Replies: 7
Views: 122

Re: Midterm

TAs would be the best to head to first!
by 105311039
Sat Nov 16, 2019 10:08 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How to treat Radicals
Replies: 5
Views: 73

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.
by 105311039
Sat Nov 16, 2019 10:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent and Angular?
Replies: 6
Views: 66

Re: Bent and Angular?

Yes they are the same thing! However, Professor Lavelle uses Bent so I would stick to that!
by 105311039
Sun Nov 10, 2019 10:16 pm
Forum: Lewis Structures
Topic: Lewis Dot Structures
Replies: 7
Views: 88

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.
by 105311039
Sun Nov 10, 2019 10:13 pm
Forum: Resonance Structures
Topic: Drawing Resonance Structures
Replies: 3
Views: 51

Re: Drawing Resonance Structures

Yes! Draw every possibility of the bond. However, there will always be one "best" structure!
by 105311039
Sun Nov 10, 2019 10:11 pm
Forum: Lewis Structures
Topic: Midterm grades
Replies: 26
Views: 405

Re: Midterm grades

In lecture on friday, Lavelle said that we will get it back on wednesday!
by 105311039
Sun Nov 10, 2019 10:06 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: The exceptions
Replies: 6
Views: 191

Re: The exceptions

The two exceptions are copper and chromium, the rest of the group under those two elements.
by 105311039
Sun Nov 10, 2019 10:04 pm
Forum: Dipole Moments
Topic: Dipole moments
Replies: 3
Views: 37

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".
by 105311039
Sun Nov 10, 2019 10:01 pm
Forum: Bond Lengths & Energies
Topic: Test 2 Topics
Replies: 40
Views: 731

Re: Test 2 Topics

It will cover material from the midterm and on!
by 105311039
Sun Nov 03, 2019 10:38 pm
Forum: Resonance Structures
Topic: Including resonance structures
Replies: 2
Views: 40

Re: Including resonance structures

I think they will specifically ask for resonance structures when they want them.
by 105311039
Sun Nov 03, 2019 10:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterms
Replies: 6
Views: 89

Re: Midterms

Yes, 1 midterm and we will have another test and a final.
by 105311039
Sun Nov 03, 2019 10:33 pm
Forum: Formal Charge and Oxidation Numbers
Topic: formal charge
Replies: 5
Views: 69

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.
by 105311039
Sun Nov 03, 2019 10:30 pm
Forum: Bond Lengths & Energies
Topic: Why Are Double Bonds Shorter
Replies: 16
Views: 331

Re: Why Are Double Bonds Shorter

Double bonds are closer because they have a stronger bond, so they pull the elements closer together.
by 105311039
Sun Oct 27, 2019 10:14 pm
Forum: Ionic & Covalent Bonds
Topic: electron configuration
Replies: 5
Views: 71

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.
by 105311039
Sun Oct 27, 2019 10:11 pm
Forum: Ionic & Covalent Bonds
Topic: Homework
Replies: 13
Views: 194

Re: Homework

Both sections for this week should be okay!
by 105311039
Mon Oct 21, 2019 4:17 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Homework Question 1E.9
Replies: 3
Views: 47

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...
by 105311039
Mon Oct 21, 2019 4:10 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1D. 23
Replies: 4
Views: 59

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...
by 105311039
Mon Oct 21, 2019 4:00 pm
Forum: Quantum Numbers and The H-Atom
Topic: Electron spin
Replies: 5
Views: 64

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.
by 105311039
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: 77

!

Yes! The 4s electrons are removed before the 3d electrons!
by 105311039
Mon Oct 21, 2019 1:24 pm
Forum: Quantum Numbers and The H-Atom
Topic: Spin and orbitals
Replies: 4
Views: 45

Re: Spin and orbitals

This is due to Hund's rule, which was mentioned by Dr. Lavelle in lecture.
by 105311039
Mon Oct 21, 2019 1:21 pm
Forum: Trends in The Periodic Table
Topic: Atomic Radius
Replies: 7
Views: 119

Re: Atomic Radius

Its the distance between two touching atoms and their nuclei.
by 105311039
Mon Oct 21, 2019 1:16 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Spin
Replies: 5
Views: 75

Re: Electron Spin

There can only be two electron spins, which depends on the Ms quantum number.
by 105311039
Mon Oct 21, 2019 1:14 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: What's the right equation?
Replies: 7
Views: 94

Re: What's the right equation?

It should be the first equation!
by 105311039
Sun Oct 13, 2019 1:54 pm
Forum: Properties of Light
Topic: 1A3
Replies: 5
Views: 64

Re: 1A3

Yes! The speed of light is constant! And will never change.
by 105311039
Sun Oct 13, 2019 1:52 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: First Test Result
Replies: 5
Views: 181

Re: First Test Result

Possibly in your discussion this week!
by 105311039
Sun Oct 13, 2019 1:48 pm
Forum: Photoelectric Effect
Topic: Video Modules
Replies: 7
Views: 61

Re: Video Modules

Yes, its recommended to watch them, but not required!

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