Search found 101 matches
- Mon Mar 15, 2021 11:45 am
- Forum: Administrative Questions and Class Announcements
- Topic: THANK YOU DR LAVELLE!
- Replies: 47
- Views: 6272
Re: THANK YOU DR LAVELLE!
Thank you Dr Lavelle, Reid, and all the UAs for a great quarter!
- Mon Mar 15, 2021 11:44 am
- Forum: General Science Questions
- Topic: Final thoughts
- Replies: 28
- Views: 4470
Re: Final thoughts
I didn't think that the final was easier or harder than any of the midterms, pretty much a similar difficulty.
- Thu Mar 11, 2021 11:42 am
- Forum: Student Social/Study Group
- Topic: UA Worksheets
- Replies: 3
- Views: 551
Re: UA Worksheets
TYSM!
- Thu Mar 11, 2021 11:41 am
- Forum: Student Social/Study Group
- Topic: Favorite TV shows
- Replies: 277
- Views: 34295
Re: Favorite TV shows
Peaky Blinders is an 11/10
- Thu Mar 11, 2021 11:40 am
- Forum: Student Social/Study Group
- Topic: How are y'all doing?
- Replies: 46
- Views: 2322
Re: How are y'all doing?
I feel so burnt out. I've lost motivation for schoolwork, class, exercising, really everything. I'm at the point where I just want the quarter to end rather than feeling motivated to do my best.
- Wed Mar 10, 2021 1:52 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts in the Slow Step
- Replies: 17
- Views: 865
Re: Catalysts in the Slow Step
The overall reaction should not include a catalyst.
- Wed Mar 10, 2021 1:50 pm
- Forum: Balancing Redox Reactions
- Topic: Studying for finals?
- Replies: 47
- Views: 1993
Re: Studying for finals?
I'm going to review sessions, reviewing discussion slides (which have textbook problems), and reviewing sapling.
- Wed Mar 10, 2021 1:49 pm
- Forum: General Rate Laws
- Topic: Final Exam
- Replies: 19
- Views: 759
Re: Final Exam
it will be cumulative
- Tue Mar 09, 2021 9:17 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: What does kinetically stable mean?
- Replies: 6
- Views: 1220
Re: What does kinetically stable mean?
Kinetic stability has to do with the speed of the reaction. Slower reactions mean higher kinetic stability.
- Tue Mar 09, 2021 9:16 am
- Forum: Student Social/Study Group
- Topic: How do you deal with burnout?
- Replies: 144
- Views: 13089
Re: How do you deal with burnout?
Its hard for me to stay motivated when I'm just sitting at my desk, I miss walking to campus and sitting in a lecture hall a lot more than I thought I would.
- Tue Mar 09, 2021 9:14 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Approximation for Weak Acid/Base
- Replies: 3
- Views: 310
Re: Approximation for Weak Acid/Base
I remember Dr. Lavelle using 10^-3 as sort of the cutoff, but I also heard in a review session last night people saying smaller numbers. I used 10^-3 for the first midterm. I think for questions on the final it will be very obvious if you can approximate or not.
- Tue Mar 09, 2021 9:13 am
- Forum: Student Social/Study Group
- Topic: What do you miss / What are you looking forward to?
- Replies: 92
- Views: 8089
Re: What do you miss / What are you looking forward to?
rende burritos after practice are a big miss
- Sun Mar 07, 2021 11:23 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Change in Cell Potential
- Replies: 5
- Views: 268
Re: Change in Cell Potential
Q shouldn't be affected, because an increase in water will still mean the same proportion of reactants and products.
- Sun Mar 07, 2021 11:19 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy vs Entropy
- Replies: 39
- Views: 3007
Re: Enthalpy vs Entropy
Enthalpy involves heat released, while entropy is the number of states a system can be in.
- Sun Mar 07, 2021 11:18 am
- Forum: Student Social/Study Group
- Topic: Fave food
- Replies: 266
- Views: 28593
Re: Fave food
sushi!
- Sun Mar 07, 2021 11:17 am
- Forum: Balancing Redox Reactions
- Topic: Oxidizing Agent
- Replies: 33
- Views: 1193
Re: Oxidizing Agent
Higher reduction potential = better oxidizing agent
- Sun Mar 07, 2021 11:16 am
- Forum: Balancing Redox Reactions
- Topic: Balancing Reactions Help
- Replies: 5
- Views: 297
Re: Balancing Reactions Help
I went on Youtube and watched a few videos and then did some practice problems and I feel pretty confident now.
- Sun Mar 07, 2021 11:15 am
- Forum: General Rate Laws
- Topic: Youtube Review
- Replies: 17
- Views: 876
Re: Youtube Review
I agree with the two other responses
- Sun Mar 07, 2021 11:15 am
- Forum: Balancing Redox Reactions
- Topic: Balancing Redox
- Replies: 16
- Views: 829
Re: Balancing Redox
Use the charges given and the oxidation numbers to figure out how many e-'s to add
- Sun Feb 21, 2021 7:15 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: 4J.5 Standard change in gibbs free energy
- Replies: 6
- Views: 350
Re: 4J.5 Standard change in gibbs free energy
Its probably just that one question, if we were to get a standards Gibbs free energy calculation question on a test you would be given the values for reactants and products and could use the normal equation.
- Sun Feb 21, 2021 7:13 pm
- Forum: Student Social/Study Group
- Topic: Post Midterm 2 De-stressing
- Replies: 92
- Views: 6089
Re: Post Midterm 2 De-stressing
A little bit of Peaky Blinders for me!
- Sun Feb 21, 2021 7:13 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: State function?
- Replies: 36
- Views: 1276
Re: State function?
Cell potential is not a state function. Usually state functions have a delta value in their equations
- Sun Feb 14, 2021 1:36 pm
- Forum: Student Social/Study Group
- Topic: 14BL next quarter
- Replies: 7
- Views: 426
Re: 14BL next quarter
How is 14bl compared to 14b in terms of content? Are they super related
- Sun Feb 14, 2021 1:17 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Sapling Learning Week 5 and 6 Homework Question 19
- Replies: 5
- Views: 241
Re: Sapling Learning Week 5 and 6 Homework Question 19
How did the partial pressures in bars end up cancelling? I tried converting bars to joules but it isn't on our equations sheet. Do we not have to do that?
- Sun Feb 14, 2021 1:15 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Degeneracy
- Replies: 5
- Views: 292
Re: Degeneracy
Degeneracy is the number of arrangements a molecule can have. I know its a bit confusing since its W and work is w.
- Sun Feb 14, 2021 1:12 pm
- Forum: Calculating Work of Expansion
- Topic: Sign of work
- Replies: 25
- Views: 857
Re: Sign of work
Prof Lavelle has always just said if work is done on the system w is positive and if the system does work then w is negative
- Sun Feb 14, 2021 1:11 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Sapling Week 5/6 #18
- Replies: 5
- Views: 274
Re: Sapling Week 5/6 #18
Does anyone know how the second part would be formatted? I did it the same way as the top part and sapling keeps rejecting my answer as well. I tried a big number and I tried scientific notation.
- Sun Feb 14, 2021 1:02 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Sapling Week 5/6 #18
- Replies: 5
- Views: 274
Re: Sapling Week 5/6 #18
Thanks for the info, sapling is really annoying sometimes where it doesn't take certain answers even though they are right. I was doing the same thing you did and was super frustrated because I knew I wasn't doing anything wrong but couldn't get sapling to accept my answer.
- Sun Feb 14, 2021 12:58 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Likeliness to form products/reactants
- Replies: 27
- Views: 866
Re: Likeliness to form products/reactants
Delta G is negative means more products, and a positive delta G means more reactants.
- Sun Feb 07, 2021 11:01 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Sapling #12 Week 3/4
- Replies: 5
- Views: 185
Re: Sapling #12 Week 3/4
Thank you so much, I struggled for a while with this problem. I was using q=mC(deltaT). Is there a reason why you wouldn't use this equation for this problem? Probably something I missed as to why not to use that formula.
- Fri Feb 05, 2021 3:41 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Key points of First Law
- Replies: 8
- Views: 190
Re: Key points of First Law
Conservation of Energy!
- Fri Feb 05, 2021 3:41 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Constant pressure/ volume
- Replies: 11
- Views: 417
Re: Constant pressure/ volume
No, this is not the case. In fact, when pressure is constant, the volume usually changes and when volume is constant the pressure usually changes. This can be obtained from the ideal gas law.
- Fri Feb 05, 2021 3:39 pm
- Forum: Student Social/Study Group
- Topic: Study routine.
- Replies: 51
- Views: 2288
Re: Study routine.
I go to workshops often and review the hw, but I definitely need to do more textbook problems for practice
- Fri Feb 05, 2021 3:38 pm
- Forum: Student Social/Study Group
- Topic: Studying When You Don't Want to
- Replies: 48
- Views: 2492
Re: Studying When You Don't Want to
I try and schedule my days out really well, so that I know exactly what I have to get done and it helps me feel better knowing I got everything done that I wanted to for a day.
- Sun Jan 31, 2021 2:18 pm
- Forum: Phase Changes & Related Calculations
- Topic: endothermic/exothermic
- Replies: 43
- Views: 4328
Re: endothermic/exothermic
I think of it kind of like a flow chart from solid->liquid->gas. going to the right on that sequence requires energy (endo) and going to the left releases energy (exo).
- Sun Jan 31, 2021 2:17 pm
- Forum: Student Social/Study Group
- Topic: Worried About MT 1 Grades
- Replies: 39
- Views: 1628
Re: Worried About MT 1 Grades
Definitely guessed on 2, and didn't feel great about 1 other question. Maybe professor Lavelle will curve or if not we have another midterm and the final to go!
- Sun Jan 31, 2021 2:15 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Factors that affect the equilibrium constant
- Replies: 31
- Views: 3974
Re: Factors that affect the equilibrium constant
Temperature is the main one
- Sun Jan 31, 2021 2:14 pm
- Forum: Phase Changes & Related Calculations
- Topic: when to assume x is insignificant
- Replies: 86
- Views: 6386
Re: when to assume x is insignificant
You can only assume x is insignificant if the Ka/Kb value is 1x10^-3 times smaller. Basically when Ka or Kb is really really small you can disregard the x
- Sun Jan 31, 2021 2:12 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE Chart Question
- Replies: 26
- Views: 1392
Re: ICE Chart Question
You would still take into account the exponents.
- Sun Jan 24, 2021 12:21 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat released/ gained
- Replies: 22
- Views: 936
Re: Heat released/ gained
Energy is always needed to break bonds and released when forming bonds
- Sun Jan 24, 2021 12:20 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Water as a liquid in a reaction
- Replies: 4
- Views: 182
Re: Water as a liquid in a reaction
If water is the main solvent it is not included.
- Sun Jan 24, 2021 12:18 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE Tables
- Replies: 36
- Views: 1591
Re: ICE Tables
coefficients!
- Sun Jan 24, 2021 12:17 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Studying for Midterm #1
- Replies: 63
- Views: 2406
Re: Studying for Midterm #1
HW and textbook problems are the way to go.
- Thu Jan 14, 2021 7:57 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: sapling #4
- Replies: 4
- Views: 144
Re: sapling #4
Once you get x, plug it into the "equilibrium" section of the ICE box. Also, check if you need to convert moles to M by dividing by the Liters.
- Thu Jan 14, 2021 7:56 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Difference between kA and kB
- Replies: 8
- Views: 290
Re: Difference between kA and kB
You just have to identify the base and the acid, which can be hard. Best way to learn those is thru practice.
- Thu Jan 14, 2021 7:55 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Neglecting Water
- Replies: 20
- Views: 985
Re: Neglecting Water
There is so much water, and so little [H30+] and [OH-] are produced in comparison, that the concentration of water basically stays the same. The concentration change is so many decimal points out that it is negligible
- Thu Jan 14, 2021 7:53 pm
- Forum: Student Social/Study Group
- Topic: Advice for someone who didn't take 14A with professor Lavelle
- Replies: 61
- Views: 2676
Re: Advice for someone who didn't take 14A with professor Lavelle
Go to workshops constantly (I try for 2 a week) not just before tests. It really helps
- Thu Jan 14, 2021 7:53 pm
- Forum: General Science Questions
- Topic: Calculating Ka from pKa
- Replies: 7
- Views: 1160
Re: Calculating Ka from pKa
When you have log10(a)=c, to get to exponential form it would be 10^c= a. Thus, since the pka is c in this example, raise 10 to whatever the pka is and it should give you ka. Someone might want to double check me on that one though because its been a while since I've done that kind of math
- Sat Jan 09, 2021 1:22 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q and K
- Replies: 17
- Views: 721
Re: Q and K
K will stay the same, but Q will need to be calculated again and then you can compare the K and Q to determine reaction direction.
- Sat Jan 09, 2021 1:21 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Calculating concentrations using ICE Chart
- Replies: 8
- Views: 352
Re: Calculating concentrations using ICE Chart
I think that most of the time we'll be given larger K values, so that we have to use the quadratic equation.
- Sat Jan 09, 2021 1:20 pm
- Forum: Student Social/Study Group
- Topic: Final Exam Study Tips
- Replies: 48
- Views: 2341
Re: Final Exam Study Tips
Textbook problems and reading, step up sessions, rereading lecture notes are what I've been doing. Hopefully by starting week 1 I'll be better prepared for the midterms and final
- Sat Jan 09, 2021 1:18 pm
- Forum: Ideal Gases
- Topic: Units of Temperature
- Replies: 82
- Views: 3345
Re: Units of Temperature
This should always be in kelvin, and I think the kelvin/celsius conversion formula is on our formula sheet, in case its needed on an exam.
- Sat Jan 09, 2021 1:17 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs. Q
- Replies: 53
- Views: 1919
Re: K vs. Q
Yes, Q just applies to a reaction that is not at equilibrium, while K is at equilibrium. You can compare the two values to determine which direction the reaction is going.
- Tue Dec 15, 2020 11:50 am
- Forum: Student Social/Study Group
- Topic: Changing Study Habits
- Replies: 35
- Views: 1279
Re: Changing Study Habits
The UA sessions are something that I didn't utilize until the final but its something that I'll go to every week in 14b
- Tue Dec 15, 2020 11:48 am
- Forum: Student Social/Study Group
- Topic: Final Exam
- Replies: 49
- Views: 2440
Re: Final Exam
The last two questions were complete guesses for me, 3 minutes per question was way shorter than I thought it would be
- Tue Dec 15, 2020 11:47 am
- Forum: Student Social/Study Group
- Topic: Winter Break
- Replies: 44
- Views: 2026
Re: Winter Break
I'm going to just flip through my 14a notebook occasionally, specifically on sections that were difficult for me in the class
- Tue Dec 08, 2020 3:34 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: wedge and dash
- Replies: 14
- Views: 2562
Re: wedge and dash
A wedge means it is coming towards you (picture straight out of the paper). And the dash means that it is going directly away from you (straight behind the paper). The wedge and the dash are in the same plane, just in opposite directions. Its a 2d representation of where the atoms or molecules are i...
- Tue Dec 08, 2020 3:32 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted vs Lewis
- Replies: 8
- Views: 346
Re: Bronsted vs Lewis
They are just two separate ways of explaining what is happening. Two different POVs If you will.
- Tue Dec 08, 2020 3:31 pm
- Forum: Ionic & Covalent Bonds
- Topic: Comparative strength of sigma bonds
- Replies: 2
- Views: 218
Re: Comparative strength of sigma bonds
The easiest way to determine this is by the length of the bond. Longer bond = weaker bond. In your example, carbon-oxygen bond would be weaker because it is slightly longer than a C-N bond. There are of course other factors but this is the one that professor keeps mentioning the most, so I would ass...
- Sat Nov 28, 2020 1:48 pm
- Forum: Lewis Structures
- Topic: lewis structure resonance
- Replies: 5
- Views: 310
Re: lewis structure resonance
Lewis structures that do not have ideal formal charges would not be incorrect, but rather "less ideal" or more unlikely to occur naturally.
- Sat Nov 28, 2020 1:46 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polarity and Shape
- Replies: 13
- Views: 620
Re: Polarity and Shape
Drawing out the lewis structure with dipole arrows is the best way to figure this out, because you can see if they cancel.
- Sat Nov 28, 2020 1:44 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 15
- Views: 547
Re: Final
I would assume it will probably be proctored on respondus like the midterms.
- Thu Nov 26, 2020 9:53 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pair Placement
- Replies: 4
- Views: 198
Re: Lone Pair Placement
Lone pairs repel each other as well as other atoms +bonds. This is why, in say NH3, the lone pair "on top" of Nitrogen in the lewis structure pushes the N-H bond angles away from it.
- Thu Nov 26, 2020 9:51 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Sigma and Pi Bonds
- Replies: 33
- Views: 1534
Re: Sigma and Pi Bonds
The triple bond will just contain 1 sigma and 2 pi bonds, I think that's all the detail we need to know.
- Thu Nov 26, 2020 9:50 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: What does delocalized π bond mean?
- Replies: 18
- Views: 601
Re: What does delocalized π bond mean?
Think of benzene, where there are 3 double bonds, however, each carbon could theoretically form a double bond. Furthermore, the pi bonds are all in the same plane, allowing a sort of highway where electrons can move freely. Thus at any point the pi bond could be between any two of the carbons in ben...
- Thu Nov 26, 2020 9:47 am
- Forum: Resonance Structures
- Topic: Resonance
- Replies: 9
- Views: 549
Re: Resonance
To add on to everyone else, the easiest way to visualize the resonance structures is to draw the lewis structure. Then, consider where 2 electrons (usually a lone pair or double bond) can be moved to still contribute to a correct structure. Formal charge can then be used to decide which resonance st...
- Tue Nov 17, 2020 8:56 pm
- Forum: Lewis Structures
- Topic: Drawing Lewis Structures for Long Molecules
- Replies: 2
- Views: 107
Re: Drawing Lewis Structures for Long Molecules
^^ I agree, looking into the formula for molecules you already know how to draw is a good way to start.
- Tue Nov 17, 2020 8:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Missed chem community posts
- Replies: 12
- Views: 568
Re: Missed chem community posts
Hopefully y'all are right, I missed a week as well.
- Tue Nov 17, 2020 8:53 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Length vs Size of Molecule
- Replies: 14
- Views: 728
Re: Bond Length vs Size of Molecule
Larger atoms do mean weaker bonds. However, there are other factors that influence a boiling point, so those are probably the reason why the boiling points are what they are.
- Mon Nov 16, 2020 6:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2 Question
- Replies: 12
- Views: 635
Re: Midterm 2 Question
Last midterm I had respondus and the midterm on my laptop and then zoom on my phone and this setup worked pretty well.
- Mon Nov 16, 2020 6:17 pm
- Forum: Electronegativity
- Topic: Partial vs Formal charge
- Replies: 8
- Views: 954
Re: Partial vs Formal charge
To add on to what everyone else said, partial charges are less intense (why they're called partial), can generally fluctuate a bit as the electrons move around, and sometimes only occur at specific moments. A formal charge will not change because it refers to the total number of electrons, and is no...
- Mon Nov 16, 2020 6:15 pm
- Forum: Student Social/Study Group
- Topic: Studying for Midterm 2
- Replies: 4
- Views: 100
Re: Studying for Midterm 2
For MT1 I reviewed HW problems, recommended textbook problems, and UA worksheets and this worked really well for me.
- Fri Nov 13, 2020 9:59 pm
- Forum: Trends in The Periodic Table
- Topic: atomic radii
- Replies: 12
- Views: 501
Re: atomic radii
I'm assuming on tests the comparisons will be directly to elements in the same row (i.e. further right has larger radii) or same column (further down = larger radii). Trying to determine the radii in a diagonal fashion is usually too difficult, that would probably be given to us
- Fri Nov 13, 2020 9:57 pm
- Forum: Lewis Structures
- Topic: Hydrogen never being central atom?
- Replies: 2
- Views: 116
Re: Hydrogen never being central atom?
I don't think hydrogen will ever be the central atom. Even though its on the left side of the periodic table I was taught in high school to treat it as sort of its own thing.
- Fri Nov 13, 2020 9:56 pm
- Forum: Lewis Structures
- Topic: Bond Length
- Replies: 3
- Views: 213
Re: Bond Length
This depends on if the bonds are double or single bonds, if resonance structures exists where the type of bond changes, or if there were differences in the two elements (rather than being a N-N bond).
- Fri Nov 13, 2020 9:54 pm
- Forum: Resonance Structures
- Topic: Resonance Hybrids
- Replies: 2
- Views: 164
Re: Resonance Hybrids
Lone pairs determine resonance. Try drawing the structure out and using arrows to show where electrons can be moved to form double bonds or lone pairs. This is how I learned resonance in high school
- Mon Nov 09, 2020 1:32 pm
- Forum: Bond Lengths & Energies
- Topic: Negative energies? [ENDORSED]
- Replies: 7
- Views: 685
Re: Negative energies? [ENDORSED]
When ions form a bond and come together it releases energy, it then requires energy to break that bond again.
- Mon Nov 09, 2020 1:31 pm
- Forum: Electronegativity
- Topic: Finding electronegativity values
- Replies: 6
- Views: 192
Re: Finding electronegativity values
As long as you can make general electronegativity assumptions by looking at a periodic table I think that's good enough
- Sat Nov 07, 2020 1:10 pm
- Forum: Resonance Structures
- Topic: Resonant Structures and Formal Charge
- Replies: 3
- Views: 119
- Sat Nov 07, 2020 1:08 pm
- Forum: Lewis Structures
- Topic: lewis structure
- Replies: 17
- Views: 567
Re: lewis structure
The brackets and charge on the outside of the diagram has to do with the overall charge of the molecule. However, partial positive and negative charges can be attributed to each atom in the molecule.
- Sat Nov 07, 2020 1:06 pm
- Forum: Resonance Structures
- Topic: Resonance structures
- Replies: 3
- Views: 195
Re: Resonance structures
I believe that when there is a resonance structure, there is no way to confirm actual bond lengths, since the bond and electrons can move freely. Thus the experimentally observed average is generally used
- Sat Nov 07, 2020 1:05 pm
- Forum: Electronegativity
- Topic: Noble Gases
- Replies: 40
- Views: 12530
Re: Noble Gases
Noble gasses usually aren't considered. Since they have a full octet, they don't naturally accept electrons due to the energy it would take to accept. However, it can happen in labs and special situations
- Wed Nov 04, 2020 4:32 pm
- Forum: Lewis Structures
- Topic: Lone Pair Electrons
- Replies: 3
- Views: 163
Re: Lone Pair Electrons
I would definitely just put them in, its confusing if they are not there. They also give important info as to what kind of bonds and what elements that the atom in question can bond to.
- Wed Nov 04, 2020 4:31 pm
- Forum: Ionic & Covalent Bonds
- Topic: Different Bonds
- Replies: 8
- Views: 309
Re: Different Bonds
Adding on, covalent bonds are between two nonmetals, while ionic bonds are one metal and a nonmetal.
- Wed Nov 04, 2020 4:30 pm
- Forum: Ionic & Covalent Bonds
- Topic: 2 paired electrons
- Replies: 3
- Views: 88
Re: 2 paired electrons
I believe if there are 2 in the orbital they are always paired, each electron having a different spin direction.
- Wed Oct 28, 2020 6:41 pm
- Forum: Photoelectric Effect
- Topic: Chapter Readings for the 2nd Midterm
- Replies: 6
- Views: 284
Re: Chapter Readings for the 2nd Midterm
I would assume that it's the next two outlines as long as the remainder of outline 2
- Sun Oct 25, 2020 10:32 pm
- Forum: SI Units, Unit Conversions
- Topic: conversion factors
- Replies: 8
- Views: 411
Re: conversion factors
I don't think so. I'm focusing on remembering all of the one's that aren't specifically given (like what units make up a Joule, etc.)
- Sun Oct 25, 2020 10:30 pm
- Forum: General Science Questions
- Topic: Fundamentals
- Replies: 4
- Views: 198
Re: Fundamentals
I believe fundamentals will be on the midterm.
- Sun Oct 25, 2020 10:30 pm
- Forum: DeBroglie Equation
- Topic: De Broglie's Derived Eq
- Replies: 3
- Views: 183
Re: De Broglie's Derived Eq
If you are talking about for the midterm, the equation will be given, so I don't think we have to memorize as long as you know what the variables stand for. As for how he derived it, I doubt we need to know exact steps, maybe just know the general equations that he used.
- Sun Oct 25, 2020 10:28 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: orbital concepts
- Replies: 6
- Views: 264
Re: orbital concepts
To add onto everyone else, also as you go higher up in atomic numbers on the periodic table the number of orbitals increases (more electrons) and the letters do as well. There's a specific order and the letters don't always go in order.
- Sun Oct 25, 2020 10:25 pm
- Forum: SI Units, Unit Conversions
- Topic: Do I need to do very single textbook question on the syllabus?
- Replies: 34
- Views: 1429
Re: Do I need to do very single textbook question on the syllabus?
Yea, I'm feeling the same. But I'm doing a couple every night to prepare for the midterm.
- Sun Oct 18, 2020 2:58 pm
- Forum: *Black Body Radiation
- Topic: Black Body Radiation
- Replies: 6
- Views: 495
Re: Black Body Radiation
Black body is totally hypothetical. Black cloth does absorb more light than say a white cloth, but there is no real thing that can emit and absorb all wavelengths of light.
- Sun Oct 18, 2020 2:56 pm
- Forum: Student Social/Study Group
- Topic: studying for exams
- Replies: 21
- Views: 2368
Re: studying for exams
I think rewriting notes and going thru practice problems, and then quizzing myself on topics with a friend Is going to be my strategy
- Sun Oct 18, 2020 2:54 pm
- Forum: Properties of Light
- Topic: Equation masterlist
- Replies: 6
- Views: 342
Re: Equation masterlist
I think they are given to us during the exam anyway.
- Sun Oct 18, 2020 2:52 pm
- Forum: Properties of Light
- Topic: Energy from shorter wavelength
- Replies: 5
- Views: 224
Re: Energy from shorter wavelength
I believe it means the energy of the photon. That's what the equation is solving for.
- Sun Oct 18, 2020 2:50 pm
- Forum: DeBroglie Equation
- Topic: Names of equations
- Replies: 8
- Views: 300
Re: Names of equations
The equations are given, so as long as we know what each variable is and when to use the equation I don't think we need to know the names
- Sun Oct 18, 2020 2:48 pm
- Forum: Student Social/Study Group
- Topic: How are you studying?
- Replies: 204
- Views: 17469
Re: How are you studying?
Totally agree. It's key to expose yourself to as many types of problems as possible before the test.
- Sun Oct 11, 2020 6:56 pm
- Forum: Limiting Reactant Calculations
- Topic: Sapling HW 10
- Replies: 9
- Views: 805
Re: Sapling HW 10
Thanks everyone, I struggled with this too and this thread helped a ton. Thanks to everyone
- Sun Oct 11, 2020 12:35 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2988676
Re: Post All Chemistry Jokes Here
What's the dullest element?
Bohrium!
Bohrium!
- Sat Oct 10, 2020 7:23 pm
- Forum: Empirical & Molecular Formulas
- Topic: Ratios for empircal formulas
- Replies: 6
- Views: 429
Re: Ratios for empircal formulas
When you get the number of moles, you want to divide by the smallest number to get (hopefully) whole numbers for the empirical formula