Search found 80 matches
- Thu Mar 14, 2019 3:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: lyndon's review?
- Replies: 5
- Views: 882
Re: lyndon's review?
Do you guys know what he said he's gonna call his review sheet?
- Sat Mar 09, 2019 8:13 am
- Forum: Administrative Questions and Class Announcements
- Topic: Yekan Discussion slides (1B, 1H, 1J)
- Replies: 9
- Views: 1217
Re: Yekan Discussion slides (1B, 1H, 1J)
Does anyone know how to solve the very last question (labeled Question #1) on Yekan's slides for week 8? It's the one on half life but idk what equation he used to solve for the number of days.
- Sat Mar 09, 2019 6:49 am
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
- Replies: 179
- Views: 25143
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Does anyone know if Karen posted worksheet 9 yet?
- Fri Mar 01, 2019 6:28 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Potentials and Likeliness to be reduced/oxidized
- Replies: 3
- Views: 409
Re: Potentials and Likeliness to be reduced/oxidized
If something has a positive cell potential, it is likely to be reduced. If it has a negative cell potential, it is likely to be oxidized.
- Thu Feb 28, 2019 5:53 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: reducing power
- Replies: 2
- Views: 241
Re: reducing power
If an element is a good reducing agent, it has a high reducing power. This means that it is what is getting oxidized in a reaction, which also means it has a low (negative) E value. The opposite is true for oxidation.
- Thu Feb 28, 2019 5:50 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: water in cell diagram
- Replies: 1
- Views: 241
Re: water in cell diagram
I'm pretty sure you leave it out.
- Mon Feb 25, 2019 5:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
- Replies: 179
- Views: 25143
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Can someone please explain #4 on the electrochem worksheet? I don't understand why the answer is Ag+ not Fe2+
- Sat Feb 23, 2019 3:55 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Quiz 3
- Replies: 3
- Views: 360
Quiz 3
On quiz 3 do we have to know just Galvanic/Voltaic cells or electrolytic cells as well?
- Sat Feb 23, 2019 3:54 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Test 3
- Replies: 14
- Views: 2368
Re: Test 3
Yes, especially know that max work = change in G = -nFE
I believe Professor Lavelle went over this in lecture Friday as well.
I believe Professor Lavelle went over this in lecture Friday as well.
- Sat Feb 23, 2019 3:53 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram
- Replies: 2
- Views: 278
Cell Diagram
if the two ions in the cathode portion are both aqueous, why do we separate them with a comma rather than a solid line when writing the cell diagram?
- Sat Feb 23, 2019 3:51 pm
- Forum: Balancing Redox Reactions
- Topic: Cell Diagram
- Replies: 2
- Views: 263
Cell Diagram
So, just to clarify, if there is not solid in the cathode portion of the cell diagram, we have to add Platinum to it? Can anyone explain why we must do this?
- Wed Feb 20, 2019 7:07 pm
- Forum: Balancing Redox Reactions
- Topic: H+ vs H3O+
- Replies: 10
- Views: 1014
H+ vs H3O+
Does anyone know if it matters whether to use H+ vs H3O+ when writing redox reactions?
I think in the textbook it says to write H+ instead.
I think in the textbook it says to write H+ instead.
- Sat Feb 16, 2019 9:37 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Homework question 9.55
- Replies: 1
- Views: 250
Homework question 9.55
Does anyone know why the solutions manual assumes the temperature is 298K (roomtemp) for the Gibbs Free Energy calculations even if we are not specifically told in the problem?
- Sat Feb 16, 2019 9:35 am
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
- Replies: 179
- Views: 25143
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
So is there no worksheet for this week?
- Thu Feb 07, 2019 3:51 pm
- Forum: Ideal Gases
- Topic: Lyndon's review session
- Replies: 7
- Views: 840
Re: Lyndon's review session
Yea, I don't think he's finished making it yet. It will probably be posted this weeked.
- Wed Feb 06, 2019 8:33 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: 6th Edition Hw #8.11 Reversible/Irreversible
- Replies: 2
- Views: 306
Re: 6th Edition Hw #8.11 Reversible/Irreversible
In a Reversible process, the pressure is not constant (but Temp is constant). For reversible processes use the equation w= -nRTln(V2/V1). In an irreversible process, the pressure is constant and thus the temperature changes. For irreversible processes, use the equation w= -P(change V). In a reversib...
- Wed Feb 06, 2019 8:23 pm
- Forum: Calculating Work of Expansion
- Topic: Pressure Units
- Replies: 7
- Views: 796
Re: Pressure Units
Most of the time, they are provided on the constants and equations sheet. You can check the sheet on his website to see if it is on there. Usually the one on his website reflects what is given to us during the tests & midterms.
- Wed Feb 06, 2019 8:21 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isothermic definition
- Replies: 5
- Views: 912
Re: Isothermic definition
Wait, did Lavelle go over isometric in class? I only recall hearing about isothermal
- Fri Feb 01, 2019 7:41 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Enthalpy vs Internal energy
- Replies: 5
- Views: 568
Re: Enthalpy vs Internal energy
"enthalpy (H), is the sum of the internal energy of the system plus the product of the pressure of the gas in the system times the volume of the system."
- Thu Jan 31, 2019 3:40 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Path function
- Replies: 1
- Views: 232
Path function
Does anyone know what a path function is? Is it just the opposite of a state function?
- Thu Jan 31, 2019 3:37 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Extensive vs. Intensive
- Replies: 5
- Views: 802
Re: Extensive vs. Intensive
Wait so what are extrinsic and intrinsic properties than? Are how are they different than extensive and intensive properties?
- Mon Jan 28, 2019 8:41 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: qp
- Replies: 3
- Views: 553
qp
Can someone explain to me what qp is? Professor Lavelle was going over it in lecture but I'm still a little confused.
- Sun Jan 27, 2019 5:17 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: death in biological systems
- Replies: 5
- Views: 493
Re: death in biological systems
Yea, I'm pretty sure that in lecture he said that something dying means that it goes to equilibrium.
- Wed Jan 23, 2019 8:23 am
- Forum: Ideal Gases
- Topic: units for partial pressure of gases
- Replies: 6
- Views: 740
units for partial pressure of gases
Hey,
Do any of you guys know whether we should use bar or atm when calculating the partial pressures of gases?
My TA said to always convert to bars but a UA said that Lavelle prefers atm.
Do any of you guys know whether we should use bar or atm when calculating the partial pressures of gases?
My TA said to always convert to bars but a UA said that Lavelle prefers atm.
- Tue Jan 22, 2019 11:47 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Conceptual questions
- Replies: 6
- Views: 497
Re: Conceptual questions
Make sure to know Le Chatelier's principle and how a reactions reacts in response to a change in pressure/volume, concentration, temperature, etc
- Tue Jan 22, 2019 11:45 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Given Equilibruim Partial Pressures and a Volume
- Replies: 2
- Views: 210
Re: Given Equilibruim Partial Pressures and a Volume
Yes, the volume would just be a constant.
- Sat Jan 19, 2019 3:38 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Polyprotic Acids and Bases
- Replies: 2
- Views: 154
Re: Polyprotic Acids and Bases
thanks! That helps a lot :)
- Sat Jan 19, 2019 2:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
- Replies: 179
- Views: 25143
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Can someone please explain to me how number 4 part d and number 5 are solved for the the Chemical Equilibrium worksheet?
- Sat Jan 19, 2019 10:52 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Polyprotic Acids and Bases
- Replies: 2
- Views: 154
Polyprotic Acids and Bases
Hi guys,
Does anyone know whether polyprotic acids and bases will be on this upcoming exam because the last couple of homework problems involve polyprotic acids and bases but we haven't covered it in class yet.
Does anyone know whether polyprotic acids and bases will be on this upcoming exam because the last couple of homework problems involve polyprotic acids and bases but we haven't covered it in class yet.
- Fri Jan 18, 2019 10:11 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: The Quadratic Equation
- Replies: 3
- Views: 189
Re: The Quadratic Equation
This is what Professor Lavelle posted previously on this topic: "When K is smaller than 10-3 then X is much smaller than the initial concentration, [I], and therefore: [I] - X is approximately equal to [I]. Note: X is not zero. But X is much smaller than [I] and therefore the difference is appr...
- Fri Jan 18, 2019 10:06 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ka vs. Kb
- Replies: 12
- Views: 4658
Re: Ka vs. Kb
Ka times Kb= Kw = (10^-14)
pKa +pKb = 14
pKa +pKb = 14
- Mon Jan 14, 2019 6:44 pm
- Forum: Student Social/Study Group
- Topic: New to Lavelle
- Replies: 32
- Views: 5366
Re: New to Lavelle
As someone new to Lavelle I would like to ask, how well do the lectures prepare us for the midterm and final ? Is watching the modules absolutely necessary to ace this class or do the lectures go over all the topics well enough ? Also, how rigorous are the tests (not the final and the midterm the o...
- Mon Jan 14, 2019 6:41 pm
- Forum: Ideal Gases
- Topic: Using Kc or Kp
- Replies: 13
- Views: 1048
Re: Using Kc or Kp
Rachel Yoo 1F wrote:Kp is for partial pressure with units like atm, bar, torr, etc. Kc is for concentrations and will have mol/L for units
Do you know how we would convert between these different units for partial pressure or if it would be necessary?
- Mon Jan 14, 2019 6:40 pm
- Forum: Ideal Gases
- Topic: Using Kc or Kp
- Replies: 13
- Views: 1048
Re: Using Kc or Kp
Since Kc uses concentrations which are approximations, I know that we do not include mol/L units in our calculations. For Kp and partial pressures, do we leave out the units as well? Yes, I believe you can leave out units for both. Although when doing calculations using Partial Pressures, it may be...
- Mon Jan 14, 2019 6:30 pm
- Forum: General Science Questions
- Topic: Lecture Powerpoints
- Replies: 9
- Views: 767
Re: Lecture Powerpoints
Would anyone be able to inform me of what we covered in lecture today 11/14? I wasn't able to make it. Thanks in advance! Yea, we covered Acids and Bases Equilibria in lecture today. We reviewed basics on acids and bases from last quarter and then we learned about the Autoprotolysis constant (Kw). ...
- Wed Dec 05, 2018 10:51 am
- Forum: Lewis Acids & Bases
- Topic: Resonance in acids
- Replies: 3
- Views: 435
Re: Resonance in acids
Resonance stabilizes anions by delocalizing their negative charge. By creating a more stable resulting anion, the relative acidity will increase. Dr. Lavelle stated during lecture that the two things that make an acid a strong acid is: 1. the acid loses H+ easily and 2. the resulting anion must be s...
- Wed Dec 05, 2018 10:46 am
- Forum: Bronsted Acids & Bases
- Topic: How to identify Acids/Bases
- Replies: 4
- Views: 593
Re: How to identify Acids/Bases
Professor Lavelle went over in lecture that Alkali metals(group 1) oxides and hydroxides as well as Alkali Earth metal(group 2) oxides and hydroxides will be strong bases. Some examples he gave of these were Li2O, NaOH, Na2O, KOH, CaO, Ca(OH)2, Mg(OH)2. A lot of strong acids have an element from the...
- Wed Dec 05, 2018 10:37 am
- Forum: Amphoteric Compounds
- Topic: Amphoteric clarification
- Replies: 5
- Views: 565
Re: Amphoteric clarification
Yes, that is correct.
- Wed Dec 05, 2018 10:36 am
- Forum: Naming
- Topic: naming differences
- Replies: 6
- Views: 648
Re: naming differences
When do we use bis-, tris- etc. vs di- tri-, etc? You use bis-, tris-, tetrakis-, pentakis-, etc when the name of the ligand already has a di-, tri-, tetra- inside of it. For example, ethylenediamine already has di inside of the name, so you would say bisethylenediamine, rather than diethylenediami...
- Mon Dec 03, 2018 4:38 pm
- Forum: Naming
- Topic: nitro vs nitrito
- Replies: 3
- Views: 678
Re: nitro vs nitrito
Nitro is NO2 (nitrogen linked to metal) while nitrito is ONO (oxygen is linked to metal)
- Wed Nov 28, 2018 10:11 pm
- Forum: Naming
- Topic: Naming Coordination Compounds
- Replies: 9
- Views: 1105
Re: Naming Coordination Compounds
When does the roman numeral come into play, basically how do you determine what roman numeral to place on a compound? The roman numeral is used to state the oxidation state of the transition metal. It can be figured out by using all the other charges in the coordination compound since you know the ...
- Tue Nov 27, 2018 7:25 pm
- Forum: Ionic & Covalent Bonds
- Topic: Test 3
- Replies: 1
- Views: 322
Re: Test 3
No, I don't think so.
- Tue Nov 27, 2018 7:24 pm
- Forum: Hybridization
- Topic: Empty p orbitals
- Replies: 3
- Views: 1889
Re: Empty p orbitals
So, for example, if a molecule is sp^2 hybridized, than its hybridization will have 3 degenerate sp^2 hybridized orbitals and one leftover unhybridized 2p orbital. This unhybridized p orbital will account for pi bonds in the molecule since pi bonds are not hybridized.
- Tue Nov 27, 2018 7:20 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: diamagnetism and paramagnetism
- Replies: 2
- Views: 348
Re: diamagnetism and paramagnetism
I believe diamagnetism is when a molecule has no unpaired electrons and thus is not attracted to a magnetic field. The opposite is true for paramagnetism, in which the molecule is attracted to an outside magnetic field due to its unpaired electrons.
- Tue Nov 27, 2018 6:59 pm
- Forum: Hybridization
- Topic: Hybridization of Central Atom
- Replies: 3
- Views: 383
Re: Hybridization of Central Atom
This is simply due to the period number of Carbon.
- Tue Nov 27, 2018 6:55 pm
- Forum: Hybridization
- Topic: Lone Electrons and Hybridization
- Replies: 3
- Views: 560
Re: Lone Electrons and Hybridization
Yes. Lone pairs definitely do count as areas of electron density. If you look at a hybridized orbital, the paired electrons in an orbital represents the lone pairs in a molecule.
- Tue Nov 27, 2018 6:54 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Angle Distorted
- Replies: 4
- Views: 425
Re: Angle Distorted
Im guessing it has to do with the distortion of bond angles in a molecule due to lone pair repulsion.
- Tue Nov 27, 2018 6:52 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: dipole-dipole
- Replies: 1
- Views: 186
Re: dipole-dipole
Yes, dipole-dipole interactions only occur between two polar molecules who have partial charges.
- Tue Nov 27, 2018 6:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shape
- Replies: 4
- Views: 367
Re: Molecular Shape
How can you tell whether the compound is polar or nonpolar based on the shape of the Lewis structure? You can tell by drawing in dipoles on all bonds. If the dipole directions do not cancel out completely in a molecule, it is considered polar. A nonpolar molecule will have the same atoms around it ...
- Tue Nov 27, 2018 6:47 pm
- Forum: Dipole Moments
- Topic: LDF
- Replies: 5
- Views: 585
Re: LDF
Yes, all molecules will have London Dispersion forces because it is due to the random distortion of charge and all molecules have an electron cloud and a positively charged nucleus.
- Tue Nov 27, 2018 6:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shape
- Replies: 4
- Views: 367
Re: Molecular Shape
The difference in electronegativity, the amount of bonds, and the melting/boiling point can also tell you whether a bond is strong or not
- Sun Nov 25, 2018 10:11 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Naming the Shape
- Replies: 16
- Views: 1287
Re: Naming the Shape
the chart in the textbook is actually really helpful. As long as you can visualize it, it will be easy to remember the shapes and bond angles.
- Sun Nov 25, 2018 10:09 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Properties and Polarity
- Replies: 1
- Views: 134
Re: Covalent Properties and Polarity
No, I believe that ionic compounds are extremely polar molecules so even if they do show some covalent character, they will always be polar.
- Sun Nov 25, 2018 10:03 pm
- Forum: Hybridization
- Topic: sigma/pi bonds
- Replies: 7
- Views: 714
Re: sigma/pi bonds
Sigma bonds have an end-to-end interaction allowing bound atoms to rotate. They are always the first bond formed in a molecule and are the strongest bond due to the max amount of overlap. Pi bonds have a side-by-side interaction and do not allow bound atoms to rotate. They have e- density on each si...
- Sun Nov 25, 2018 9:59 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 3
- Replies: 38
- Views: 2770
Re: Test 3
I believe intermolecular interactions, bond strengths & lengths, VSEPR, molecular shape & structure, sigma & pi bonds, and hybridization are all the topics that are going to be covered on test 3.
- Sat Nov 17, 2018 10:04 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sigma & Pi bonds
- Replies: 2
- Views: 240
Re: Sigma & Pi bonds
Pi bonds are usually weaker than sigma bonds even though they are more rigid and do not allow bonded atoms to rotate. This is because for sigma bonds, molecules interact end to end linearly while pi bonds interact side-by-side, so there is much less overlap when you are looking at a pi bond.
- Sat Nov 17, 2018 9:59 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR- Polar vs Nonpolar
- Replies: 5
- Views: 288
Re: VSEPR- Polar vs Nonpolar
If you draw in the dipole moments (with the arrows) for all elements within a molecule and all dipole moments cancel each other out, than the molecule is nonpolar. If the dipole moments do not cancel each other out, than the molecule is polar. Also professor Lavelle described it in lecture that if a...
- Sat Nov 17, 2018 9:33 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Seesaw Shape
- Replies: 4
- Views: 429
Re: Seesaw Shape
Yep, that is correct. All angles will be slightly less than 90, 120, and 180 due to the lone pair repulsion.
- Sat Nov 10, 2018 4:30 pm
- Forum: Lewis Structures
- Topic: Molecule Shape
- Replies: 8
- Views: 790
Re: Molecule Shape
Why is Hydrogen bond shape not 90 degrees but 109 degrees I didn't understand that part. This is because in reality, molecules exist in 3 dimension, not 2. So in 3D, a molecule such as CH4 will try to maximize the distance between each bond, which will lead it to have 109.5 degrees between each bon...
- Sat Nov 10, 2018 4:27 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: Hydrogen Bonds
- Replies: 14
- Views: 1058
Re: Hydrogen Bonds
Yep, hydrogen bonding is a dipole-dipole force that is stronger than induced-dipole but weaker than the ion-dipole force.
- Thu Nov 01, 2018 10:44 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis Acids and Bases on Midterm
- Replies: 4
- Views: 530
Lewis Acids and Bases on Midterm
Does anyone know if we will need to know how to identify between lewis acids and bases for the midterm? I feel like we only briefly covered it in lecture.
Also, does anyone know general tips on how to identify between acids and bases when given a compound or molecule?
Also, does anyone know general tips on how to identify between acids and bases when given a compound or molecule?
- Thu Nov 01, 2018 8:22 am
- Forum: Resonance Structures
- Topic: General guideline for drawing structures
- Replies: 4
- Views: 423
Re: General guideline for drawing structures
kellyzhang1210 wrote:when we draw resonance structures, if it has a net overall charge of -2, do we have to bracket the drawing and write subscript -2?
Yes, that is correct
- Wed Oct 31, 2018 1:20 pm
- Forum: Resonance Structures
- Topic: General guideline for drawing structures
- Replies: 4
- Views: 423
Re: General guideline for drawing structures
I think that Lavelle said in lecture that generally, the lower electronegative element will be in the middle of the structure and then the other elements will usually form bonds around it. Also, Hydrogen only can bond once so it is never in the middle of a molecule.
- Wed Oct 31, 2018 1:16 pm
- Forum: Coordinate Covalent Bonds
- Topic: bound atoms vs separate atoms
- Replies: 5
- Views: 811
Re: bound atoms vs separate atoms
Bound atoms are more stable because they have a lower potential energy. If atoms are freely moving, they have a greater potential energy and thus are less stable.
- Mon Oct 29, 2018 4:33 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
- Replies: 121
- Views: 23544
Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Hi, is the review session in Young Hall where our lectures are or is it CS24?
- Wed Oct 24, 2018 10:02 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Extra Practice Problems
- Replies: 2
- Views: 1346
Re: Extra Practice Problems
The link says page not found.
- Wed Oct 24, 2018 8:29 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Degeneracy
- Replies: 7
- Views: 3347
Re: Degeneracy
Im pretty sure that the degeneracy of a 3p orbital would just be 3 since 3px, 3py, and 3pz all have the same energy level in a multi-electron atom.
- Mon Oct 22, 2018 11:31 pm
- Forum: Properties of Light
- Topic: worksheet3 question11
- Replies: 3
- Views: 373
Re: worksheet3 question11
I'm not really sure about why d is false but for part a, I recall that lavelle briefly mentioned that since UV light has a lower wavelength, therefore a higher frequency and energy than visible or infrared lights, most metals will emit light when a UV light is shone on it. Most metals need this high...
- Sun Oct 21, 2018 10:57 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Coulomb's Law and Effective Nuclear Charge on test
- Replies: 2
- Views: 233
Coulomb's Law and Effective Nuclear Charge on test
Do any of you know if we need to know Coulomb's Law and Effective Nuclear Charge for the test? I know Lavelle gave us the equation in lecture Friday but we haven't really done much with it yet.
- Sun Oct 21, 2018 3:48 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Topics We Need to Know for the Test [ENDORSED]
- Replies: 5
- Views: 533
Re: Topics We Need to Know for the Test [ENDORSED]
Would we need to know Coulomb's Law and Effective Nuclear Charge? I know Lavelle gave us the equation in lecture Friday but we haven't really done much with it yet.
- Sun Oct 21, 2018 2:29 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: spin part of orbitals?
- Replies: 5
- Views: 486
spin part of orbitals?
Hey guys,
I was just wondering whether or not spin counted as being a part of an orbital. In the textbook questions, I don't think they were counted but im unsure as to why they aren't.
I was just wondering whether or not spin counted as being a part of an orbital. In the textbook questions, I don't think they were counted but im unsure as to why they aren't.
- Thu Oct 18, 2018 7:03 pm
- Forum: Einstein Equation
- Topic: wave vs particle behavior equations
- Replies: 2
- Views: 336
wave vs particle behavior equations
Just to clarify, the Einstein Equation and the Photoelectric Effect describe particle behavior while the Debroglie Equation is used to describe wave behavior?
Also these equations the Uncertainty Principle px= h/4pi and E= -hR/n^2 describing energy levels work for both wave and particles?
Also these equations the Uncertainty Principle px= h/4pi and E= -hR/n^2 describing energy levels work for both wave and particles?
- Thu Oct 18, 2018 6:54 pm
- Forum: DeBroglie Equation
- Topic: wave property
- Replies: 4
- Views: 375
wave property
Hey guys,
So just to clarify, we cannot use the DeBroglie equation for light/photons since this is only applicable to things with resting mass?
So just to clarify, we cannot use the DeBroglie equation for light/photons since this is only applicable to things with resting mass?
- Thu Oct 18, 2018 6:37 pm
- Forum: Photoelectric Effect
- Topic: units
- Replies: 12
- Views: 1156
units
Hey guys, I'm really confused about the units that we use in the Quantum World. So if you're given the wavelength in nm, should we convert it to meters before solving the problem? Also what are the units for Energy? I know that energy can be given as Joules, eV, cal, and Watts. So if we are given on...
- Thu Oct 11, 2018 11:08 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: En= -hR/n^2
- Replies: 3
- Views: 234
En= -hR/n^2
So during lecture Professor Lavelle stated that this equation could only be used for Hydrogen atoms. Does this mean there are separate equations for other atoms that we will have to know or will we only be solving questions for H atoms for this class?
- Thu Oct 11, 2018 11:05 am
- Forum: Limiting Reactant Calculations
- Topic: Homework question L.35 part 1 [ENDORSED]
- Replies: 1
- Views: 456
Homework question L.35 part 1 [ENDORSED]
Hi, can someone help me figure out how to solve L.35 part one of the homework question? A 1.50-gram sample of metallic tin was placed in a 26.45 g crucible and heated until all the tin had reacted with the oxygen in air to form an oxide. The crucible and product together were found to weigh 28.35 g....
- Thu Oct 11, 2018 11:01 am
- Forum: Empirical & Molecular Formulas
- Topic: Homework question M.5 part b [ENDORSED]
- Replies: 1
- Views: 276
Homework question M.5 part b [ENDORSED]
Hi, can someone help me figure out how to solve part b of M.5?
The question asks: The reaction 6CLO2 + 2BrF3 -> 6CLO2F + Br2, is carried out with 12 mol ClO2 and 5 mol BrF3.
Estimate how many moles of each product will be produced and how many moles of the excess reactant will remain.
The question asks: The reaction 6CLO2 + 2BrF3 -> 6CLO2F + Br2, is carried out with 12 mol ClO2 and 5 mol BrF3.
Estimate how many moles of each product will be produced and how many moles of the excess reactant will remain.
- Wed Oct 03, 2018 10:20 am
- Forum: SI Units, Unit Conversions
- Topic: Converting between Temperatures (K,C,F)
- Replies: 4
- Views: 441
Converting between Temperatures (K,C,F)
Hey, do any of you guys know whether there is a way to convert from Fahrenheit to Kelvin and vice versa without converting to Celsius first?
- Wed Oct 03, 2018 10:16 am
- Forum: Balancing Chemical Reactions
- Topic: Combustion
- Replies: 6
- Views: 641
Combustion
Hey, do any of you guys know what the problem is telling us if it says that there is a combustion of whatever molecule? If we were writing a chemical equation for that would it just be whatever molecule + O2 ?
- Wed Oct 03, 2018 10:10 am
- Forum: Significant Figures
- Topic: Calculating Sig Figs
- Replies: 3
- Views: 376
Re: Calculating Sig Figs
For all addition, subtraction, multiplication, and division, the number of decimal places in the result should be the same as the smallest number of decimal places in the data/question. When rounding, if the last digit of the number is >5, round up. If the last digit is <5, round down, and if the la...