Search found 91 matches

by Taylor K 2D
Sun Feb 28, 2021 1:57 pm
Forum: Balancing Redox Reactions
Topic: Sapling 7/8 Question 3
Replies: 2
Views: 31

Sapling 7/8 Question 3

Can someone please help me with this? I don't understand what I am doing wrong?
by Taylor K 2D
Thu Feb 25, 2021 11:40 am
Forum: Administrative Questions and Class Announcements
Topic: TA Office Hours
Replies: 7
Views: 32

TA Office Hours

Does anyone know if we can review our Midterms in another TA's office hours? Like if we can't make the time that our own TA has office hours, can we go to a different one's?
by Taylor K 2D
Sun Feb 21, 2021 8:31 pm
Forum: Student Social/Study Group
Topic: Post Midterm 2 De-stressing
Replies: 90
Views: 240

Re: Post Midterm 2 De-stressing

I watched WandaVision and caught up on the Bachelor :)
by Taylor K 2D
Sun Feb 21, 2021 8:30 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Boiling point
Replies: 6
Views: 28

Re: Boiling point

Isabelle Hales 1J wrote:Hi! Going off of this, is the melting point also found at equilibrium (deltaG = 0)?

I would think so! I'm pretty sure that at the temp for all phase changes (melting point, boiling point, etc) that G=0!!
by Taylor K 2D
Sun Feb 21, 2021 8:28 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Work in a Constant Volume
Replies: 13
Views: 34

Re: Work in a Constant Volume

Conceptually: when there is no change in volume, there is no expansion or compression, and therefor no work being done. Mathematically: for the equation w = -P∆V, and so if the change in volume is zero, then the work done will also be zero. for the equation w = -nRT ln V2/V1, the natural log of V2/V...
by Taylor K 2D
Sun Feb 21, 2021 8:24 pm
Forum: Phase Changes & Related Calculations
Topic: State Property
Replies: 44
Views: 141

Re: State Property

A state function is independent of the path or phase changes taken to arrive at the final destination. In other words, it only really cares about the initial and final values.
by Taylor K 2D
Sun Feb 21, 2021 8:23 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Which R Values to use
Replies: 21
Views: 48

Re: Which R Values to use

It honestly depends on which units you need in your final answers. I just keep my equation sheet next to me to help with that!
by Taylor K 2D
Sun Feb 14, 2021 8:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Can We Review our Exams?
Replies: 69
Views: 245

Re: Can We Review our Exams?

I would just email your TA to make sure you can stop by during their office hours and then you should be able to review your midterm :)
by Taylor K 2D
Sun Feb 14, 2021 8:47 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: confusion with notation
Replies: 11
Views: 34

Re: confusion with notation

The d stands for "derivative," but I think that professor Lavelle just used that to explain how he was deriving his equations :)
by Taylor K 2D
Sun Feb 14, 2021 8:45 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Sapling #19
Replies: 4
Views: 24

Re: Sapling #19

The "reverse" of the natural log (ln x) is e^x, so I just raised both sides to look like e^lnk = e^ (the rest of the equation). The e will cancel out with the ln k so you'll end up with k = e^ (the rest of the equation). I hope this helps!
by Taylor K 2D
Sun Feb 14, 2021 8:44 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Sapling Week 5/6 HW #7
Replies: 7
Views: 44

Re: Sapling Week 5/6 HW #7

The first thing that I did was try to convert watts to kilojoules (1W = 1J/s). And then the Hvap = energy of the heater/change in mole. I calculated the change in mole by subtracting the final mass from the initial and then converting from grams to mole for each compound. Once you find the Hvap for ...
by Taylor K 2D
Sun Feb 14, 2021 8:41 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Sapling question 7
Replies: 8
Views: 40

Re: Sapling question 7

I was a little confused on this as well but I think that because it's asking about the entropy of the liquid samples that the order would be reversed, so the molecules with the highest entropy in gaseous form would have the lowest entropy in liquid form? Again I am not completely sure :/
by Taylor K 2D
Sun Feb 07, 2021 2:24 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Equipartition Theorem
Replies: 2
Views: 30

Re: Equipartition Theorem

I'm confused about this also. I wish he had covered this in lecture :/
by Taylor K 2D
Sun Feb 07, 2021 2:18 pm
Forum: Calculating Work of Expansion
Topic: Textbook Problem 4A.13
Replies: 1
Views: 11

Re: Textbook Problem 4A.13

I was wondering this too but I think it is because the system is at a constant volume, so the volume of the samples is not really something we need to take into account. Additionally, since we aren't asked to find the moles or molarity, and are already given the temperature, we don't need the moles ...
by Taylor K 2D
Sun Feb 07, 2021 2:14 pm
Forum: Student Social/Study Group
Topic: Chemistry Community Posts
Replies: 9
Views: 54

Re: Chemistry Community Posts

I just click "your posts" and use the number at the top.
by Taylor K 2D
Sun Feb 07, 2021 2:12 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: HW Question
Replies: 4
Views: 24

Re: HW Question

To find q requires knowing the molar heat capacity at constant volume. Since CO2 is a linear molecule (if you draw out the lewis structure it shows that CO2 has a linear shape), then the Cv for CO2 is 5/2 R. Use that value for Cv and plug it into your equation for q. For the second part, since the s...
by Taylor K 2D
Sat Feb 06, 2021 1:47 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Week 3/4 Sapling #18
Replies: 4
Views: 44

Week 3/4 Sapling #18

I was able to find q, but I am having a really hard time finding U. Can someone please help?
by Taylor K 2D
Sun Jan 31, 2021 8:35 pm
Forum: Student Social/Study Group
Topic: Midterm Grades
Replies: 15
Views: 87

Re: Midterm Grades

I am not sure but I remember someone saying hopefully by the end of the week?
by Taylor K 2D
Sun Jan 31, 2021 8:32 pm
Forum: Calculating Work of Expansion
Topic: assuming room temperature
Replies: 4
Views: 18

Re: assuming room temperature

I would think that if we aren't given temperature (and aren't being asked to find it) then we can assume room temp or maybe STP? That's a really good question.
by Taylor K 2D
Sun Jan 31, 2021 8:26 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Sapling Week 3/4 #10
Replies: 7
Views: 67

Re: Sapling Week 3/4 #10

I tried to find the q of ice and the q of water, and then use ΔHfus+qice=−qwater to solve for final temp. I hope that helps!
by Taylor K 2D
Sun Jan 31, 2021 8:17 pm
Forum: Calculating Work of Expansion
Topic: Variables in Reversible Expansion
Replies: 1
Views: 16

Re: Variables in Reversible Expansion

I have been wondering this too!
by Taylor K 2D
Sun Jan 31, 2021 8:16 pm
Forum: Student Social/Study Group
Topic: Sapling Week 3 & 4
Replies: 2
Views: 15

Re: Sapling Week 3 & 4

I think it's due next Sunday!!
by Taylor K 2D
Fri Jan 22, 2021 3:05 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 Content
Replies: 18
Views: 103

Midterm 2 Content

Does anyone know up until what content the midterm will cover? Do you think it will cover up until today's lecture?
by Taylor K 2D
Wed Jan 20, 2021 7:58 pm
Forum: Phase Changes & Related Calculations
Topic: 4C.3 textbook problem [ENDORSED]
Replies: 2
Views: 150

Re: 4C.3 textbook problem [ENDORSED]

Im not sure! It looks like you got the same final temperature as the textbook did!
by Taylor K 2D
Wed Jan 20, 2021 7:54 pm
Forum: Ideal Gases
Topic: Inverse Kc [ENDORSED]
Replies: 41
Views: 121

Re: Inverse Kc [ENDORSED]

You use the invert of Kc when using the reverse reaction, and you use Kc^n when multiplying the entire equation by the same coefficient.
by Taylor K 2D
Wed Jan 20, 2021 7:51 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Simplifying K equations (book 5J.3)
Replies: 3
Views: 33

Re: Simplifying K equations (book 5J.3)

I think Professor Lavelle said he wouldn't give us a cubic equation that has a K larger than 1x10^-4 since we did not learn how to do that and it's a lot of extra work.
by Taylor K 2D
Wed Jan 20, 2021 7:49 pm
Forum: Phase Changes & Related Calculations
Topic: enthalpy vs temperature
Replies: 8
Views: 45

Re: enthalpy vs temperature

I think it's because as a gas, the steam or vapor has a higher enthalpy than water and thus a higher internal energy
by Taylor K 2D
Mon Jan 18, 2021 9:55 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Textbook 6D.5
Replies: 3
Views: 16

Re: Textbook 6D.5

I think that for these problems you need to use the Kb and Ka tables (Table 6d1 I believe). It says it right before the 6D questions but I also didn't see it at first.
by Taylor K 2D
Mon Jan 18, 2021 9:53 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: conjugate base
Replies: 14
Views: 67

Re: conjugate base

The conjugate base of a weak acid will be a strong base.
by Taylor K 2D
Thu Jan 14, 2021 9:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling week 1/2 question 5 [ENDORSED]
Replies: 3
Views: 40

Re: Sapling week 1/2 question 5 [ENDORSED]

The best way to calculate this is the same way you would calculate Kc: Q = [products]/[reactants], or in this case, Q = [NH3]^2/[N2][H2]^3 and then you can just plug in the concentrations.
by Taylor K 2D
Thu Jan 14, 2021 9:12 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Which Acids and Bases to remember
Replies: 3
Views: 33

Re: Which Acids and Bases to remember

Based on previous lectures, it seems we only really need to know the six strong acids (HCl, HBr, HNO3, H2SO4, HI, and HClO4), and the general weak ones that he keeps mentioning (acetic acid, H2SO3, HF, HNO2). For bases, I think we just need to know that group one and two oxides/hydroxides are strong...
by Taylor K 2D
Sun Jan 10, 2021 10:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Textbook Problem 5.39
Replies: 6
Views: 79

Re: Textbook Problem 5.39

I am also having this issue. I think that the solution manual has a typo.
by Taylor K 2D
Sun Jan 10, 2021 8:33 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Q5
Replies: 2
Views: 34

Re: Sapling Q5

For problems like these, you first have to look at all of the molecules that make up the products and reactants, in this case that is NH3, 3I2, N2, and 6HI. Then, you can look at the one step equations given and make note of the ones that contain the molecules you got from step one. Then, from the o...
by Taylor K 2D
Wed Jan 06, 2021 8:22 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Q9
Replies: 3
Views: 51

Re: Sapling Q9

I am struggling with this one too.
by Taylor K 2D
Wed Jan 06, 2021 8:19 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Reverse Reactions
Replies: 12
Views: 73

Re: Reverse Reactions

I believe so!
by Taylor K 2D
Wed Jan 06, 2021 8:19 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Calculating reaction quotients when given partial pressures
Replies: 3
Views: 22

Re: Calculating reaction quotients when given partial pressures

Qp = (P product)/(P reactant)

So for this problem, QP = (PNO2)^2/(PN2O4)

QP= (.5)^2/(.5)
by Taylor K 2D
Wed Jan 06, 2021 8:15 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: sapling #2
Replies: 8
Views: 70

Re: sapling #2

First, convert from mol to mol/L, so just divide your given mol values by the 5 L. Then, you can set up your I.C.E. or equilibrium table.
by Taylor K 2D
Sat Dec 12, 2020 8:48 pm
Forum: SI Units, Unit Conversions
Topic: Avogadro's Number
Replies: 12
Views: 131

Re: Avogadro's Number

When going from moles to atoms/molecules, you would divide by Avogadro’s number, and when going from atoms/molecules to moles, you would multiply by Avogadro’s number.
by Taylor K 2D
Sat Dec 12, 2020 8:45 pm
Forum: Conjugate Acids & Bases
Topic: Fundamental J.13 Part C
Replies: 4
Views: 44

Re: Fundamental J.13 Part C

That’s a great question. I don’t know if there would be any conjugate pairs because this reaction is between a strong acid and a strong base.
by Taylor K 2D
Sat Dec 12, 2020 8:42 pm
Forum: Student Social/Study Group
Topic: Pre-Final Rituals
Replies: 12
Views: 148

Re: Pre-Final Rituals

Usually, I either do the same exact thing or the complete opposite: stay up super late studying cause I’m so stressed out and then wake up even more stressed, but this time I’m watching holiday movies and I’m gonna try to go to bed early lol.
by Taylor K 2D
Wed Dec 09, 2020 8:06 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: Favorable forces
Replies: 1
Views: 10

Re: Favorable forces

I think a favorable force just refers to the force that acts as the main intermolecular/bonding force. So in NH3, I think hydrogen would be the more favorable force because it's the strongest IMF for NH3. I hope that helps!
by Taylor K 2D
Wed Dec 09, 2020 8:02 pm
Forum: Hybridization
Topic: What is s-character?
Replies: 1
Views: 17

Re: What is s-character?

I think s-character has to do with the ratio of s to p orbitals in hybridization? So an sp hybrid orbital would have more s character than an sp3 hybrid orbital. I found this chem community post from 2011 that might help more.

viewtopic.php?t=1255
by Taylor K 2D
Sat Dec 05, 2020 9:11 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Textbook 9C Question #5 part b
Replies: 2
Views: 22

Re: Textbook 9C Question #5 part b

This is a really good question. I would assume that it could be monodentate because of its shape and the angles between the two single-bonded oxygens preventing it from successfully bonding to the same metal but I honestly don't know. I found this link from a 2014 chem community post on the same top...
by Taylor K 2D
Sat Dec 05, 2020 9:04 pm
Forum: Naming
Topic: HW Question #1
Replies: 7
Views: 107

Re: HW Question #1

Yes! I got this one too and it took me longer than I'd care to admit lol. The name of that compound is Tetraamminedichlorocobalt(III) chloride. I got this using the rules Professor Lavelle mentioned in class. Tetra because there are four ammonias and ammine from the chart on the chem 14 A website. D...
by Taylor K 2D
Sat Dec 05, 2020 9:00 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Transition metal number of bonds
Replies: 3
Views: 27

Re: Transition metal number of bonds

This is a good question. I don't know if there a specific way to determine the bonding capacity for all transition metals. I know that it's hard to pinpoint and exact number of valence electrons a TM refers, as we've seen with their ability to hold more than a full octet. From what we've done in lec...
by Taylor K 2D
Sat Dec 05, 2020 8:56 pm
Forum: Hybridization
Topic: Unhybridized Orbitals in Relation to Hybridized Orbitals
Replies: 4
Views: 78

Re: Unhybridized Orbitals in Relation to Hybridized Orbitals

Well it depends. If you remember earlier in the quarter, when we first reviewed unhybridized orbitals, we learned that p orbitals have 3 different orientations-- px, py, and pz. Each p orbital was on a different axis. The reason the unhybridized p orbital was perpendicular rather than in plane was ...
by Taylor K 2D
Sat Dec 05, 2020 8:55 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Quick rundown on coordination numbers?
Replies: 4
Views: 43

Re: Quick rundown on coordination numbers?

Hi! Just want to point out the number of bonds and number of ligands are not the same thing. The coordination number is the amount of bonds to the central transition metal atom, but that will not necessarily be the number of ligands. After all, polydentates can form multiple bonds; for example, one...
by Taylor K 2D
Sat Dec 05, 2020 8:53 pm
Forum: Naming
Topic: Diatomic Molecules
Replies: 4
Views: 44

Re: Diatomic Molecules

That's a really good question. Chloride is a diatomic molecule but in one of the sapling questions I got I had to say dichloride and not just chloride so I am not entirely sure. I hope someone else can clear this up because I had a similar question. You might need to say di- regardless of whether or...
by Taylor K 2D
Sun Nov 29, 2020 2:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pair vs radical
Replies: 3
Views: 29

Re: Lone pair vs radical

I'm not entirely sure, but my guess would be that repulsion would be less, as there is less magnitude of negative charge to repel other electrons attached to atoms. I would agree with this. With one less electron, the repulsion will probably be less as the charge cloud is smaller than if there were...
by Taylor K 2D
Sun Nov 29, 2020 2:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Week 8 sapling #18
Replies: 3
Views: 16

Week 8 sapling #18

Can someone explain why the structure for H2CCCCH2 would not by cyclical/have the carbons form a square with one hydrogen attached to each carbon instead of the 4 carbons being in a line?
by Taylor K 2D
Tue Nov 24, 2020 6:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling #6
Replies: 5
Views: 58

Re: Sapling #6

There are two linear structures, just like there are two different "bent" structures. Molecules with 5 charge clouds, 2 bonds, and 3 lone pairs are also considered linear structures. As the others mentioned, this structure is also considered linear because the lone pairs repelling the bond...
by Taylor K 2D
Tue Nov 24, 2020 6:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: carbon hydrogen bonds
Replies: 6
Views: 52

Re: carbon hydrogen bonds

I'm a little confused on your question, but I don't believe this would affect bond angles. In our lewis structures, the surrounding atoms often have lone pairs, otherwise, they wouldn't really be a region of electron density. I hope this helps!
by Taylor K 2D
Tue Nov 24, 2020 6:01 pm
Forum: Administrative Questions and Class Announcements
Topic: Grading Scale
Replies: 4
Views: 43

Re: Grading Scale

I was wondering this too.
by Taylor K 2D
Thu Nov 19, 2020 11:44 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8782
Views: 1491089

Re: Post All Chemistry Jokes Here

What did silver say to gold at the bar?

"Ay you (Au), get outta here!"
by Taylor K 2D
Thu Nov 19, 2020 11:42 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8782
Views: 1491089

Re: Post All Chemistry Jokes Here

Two chemists walk into a bar. One tells the bartender, "I'll have an H2O." The other says, "I'll have an H2O too!" The second chemist dies.
by Taylor K 2D
Thu Nov 19, 2020 11:40 am
Forum: Resonance Structures
Topic: Resonance Structure + Energy
Replies: 2
Views: 38

Re: Resonance Structure + Energy

That's a good question. I would assume that resonance structures exist to demonstrate the possibility of different ways the compound can exist, and then the formal charges help us figure out the probability of those structures and their contribution to the resonance hybrid and the actual bond length...
by Taylor K 2D
Thu Nov 19, 2020 11:34 am
Forum: Lewis Structures
Topic: H2O Lone Pairs
Replies: 5
Views: 55

Re: H2O Lone Pairs

The lone pairs are drawn that way also because the two hydrogen bonds cannot be directly across from each other, because the repulsion from the two lone pairs would be too strong. The only stable way to place the lone pairs is "next" to each other.
by Taylor K 2D
Thu Nov 19, 2020 11:31 am
Forum: Resonance Structures
Topic: 2.7 Resonance of N5 cation
Replies: 2
Views: 43

Re: 2.7 Resonance of N5 cation

For things like this, I usually also guess and check, or try and calculate the formal charge because that helps me identify where the issues with my structures are.
by Taylor K 2D
Sun Nov 15, 2020 6:07 pm
Forum: Bond Lengths & Energies
Topic: Textbook question
Replies: 3
Views: 23

Re: Textbook question

The lewis structure of AsF3 reveals that there is one lone pair on the central atom, As, with three single bonds. This shows that AsF3 is a polar molecule (its not symmetrical and there is a clear dipole). AsF5, on the other hand, is nonpolar, as revealed by its symmetrical lewis structure. Polar mo...
by Taylor K 2D
Sun Nov 15, 2020 6:03 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Textbook 1E#11
Replies: 4
Views: 50

Re: Textbook 1E#11

Im not completely sure, but I believe the 5s sub shell comes before the 4d sub shell only when the 5s sub shell is incomplete and the 4d sub shell has no electrons. If the 5s sub shell is complete and there is electrons in the 4d subshell, then the 4d subshell will be placed and filled before the 5s...
by Taylor K 2D
Sun Nov 15, 2020 5:59 pm
Forum: Lewis Structures
Topic: Textbook Problem 2D.3
Replies: 2
Views: 11

Re: Textbook Problem 2D.3

Great question! Ba-Br does have a greater EN difference than Be-Br because Ba is less electronegative. As you pointed out, EN increases going up and across the periodic table. Br is much more electronegative than Ba and Be. Be is more electronegative than Ba. This means that the greatest difference ...
by Taylor K 2D
Wed Nov 11, 2020 5:29 pm
Forum: Dipole Moments
Topic: Sapling #17
Replies: 7
Views: 154

Re: Sapling #17

London (dispersion) forces were referred to as Van Der Waals forces and induced dipole-induced dipole forces in lecture. I believe that Professor Lavelle usually refers to them as induced dipole-induced dipole forces because that helps clarify and remind exactly what those forces do. These forces ex...
by Taylor K 2D
Wed Nov 11, 2020 5:24 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 Content
Replies: 2
Views: 46

Midterm 2 Content

I understand that the Midterm will cover material from the last 8 topics in Outline 2 to the end of Outline 3. In outline 2, it is mentioned that we will need to be able to "Describe the interpretation of atomic orbitals in terms of probability". In the textbook section 1D.4, there is an o...
by Taylor K 2D
Sat Nov 07, 2020 4:16 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Element orbital representation
Replies: 4
Views: 76

Re: Element orbital representation

Catherine Bubser 2C wrote:Does is matter the order in which these orbitals are written as long as the n number are in order?

It does matter the order in which they are written because different orbitals have different energy levels so electron configuration should be arrange in a specific order.
by Taylor K 2D
Sat Nov 07, 2020 4:13 pm
Forum: Octet Exceptions
Topic: Octet Exception for H, He, Li, and Be
Replies: 5
Views: 47

Re: Octet Exception for H, He, Li, and Be

Yup! That looks right to me!
by Taylor K 2D
Thu Nov 05, 2020 2:04 pm
Forum: General Science Questions
Topic: Grade Breakdown
Replies: 32
Views: 372

Grade Breakdown

Does anyone know Lavelle's grade breakdown/rubric, i.e. how many points equal an A/A-/B/etc.?
by Taylor K 2D
Tue Nov 03, 2020 11:52 pm
Forum: Student Social/Study Group
Topic: Favorite TV shows
Replies: 189
Views: 1216

Re: Favorite TV shows

I loved Gravity Falls as a kid and still do now. Some great shows I've watched recently are New Girl, Sherlock, and Bojack Horseman. I also plan on watching Brooklyn 99. Omg I love all of those shows (except Bojack Horseman cause I haven't seen that one yet). I also love this show called Psych, but...
by Taylor K 2D
Tue Nov 03, 2020 10:46 pm
Forum: Resonance Structures
Topic: Bond Length Measurements
Replies: 2
Views: 27

Re: Bond Length Measurements

wait wow I feel stupid now. Thank you lol
by Taylor K 2D
Tue Nov 03, 2020 10:43 am
Forum: Resonance Structures
Topic: Bond Length Measurements
Replies: 2
Views: 27

Bond Length Measurements

In Monday's lecture, Professor Lavelle mentioned that bond length was measured in amperes. I thought amperes were a measure of energy, so why are they used as the units for a measurement of length?
by Taylor K 2D
Sun Nov 01, 2020 9:39 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Avogadro constant
Replies: 16
Views: 186

Re: Avogadro constant

when converting to moles from number of atoms or vice versa, you would need to use Avogadro's constant.
by Taylor K 2D
Sun Nov 01, 2020 9:34 pm
Forum: Photoelectric Effect
Topic: N initial vs. N final
Replies: 7
Views: 107

Re: N initial vs. N final

Yup! It also helps to know which energy levels correspond with which series/radiation (Lyman= uv = n=1 and Blamer=visible=n=2).
by Taylor K 2D
Thu Oct 29, 2020 3:03 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8782
Views: 1491089

Re: Post All Chemistry Jokes Here

Here are some chem memes I made in my high school chem class lol
by Taylor K 2D
Thu Oct 29, 2020 2:52 pm
Forum: Student Social/Study Group
Topic: Lavelle's Jokes
Replies: 18
Views: 248

Re: Lavelle's Jokes

These are memes I made when I took chem in high school lol.
by Taylor K 2D
Wed Oct 28, 2020 1:30 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Simplification for Electron Configuration
Replies: 3
Views: 44

Re: Simplification for Electron Configuration

You can only simplify to the previous noble gas (last column in the periodic table). This is because the noble gases have their respective orbitals and sub shells completely filled. You cannot simplify using any other elements. For example, if you were writing the electron configuration for Aluminum...
by Taylor K 2D
Wed Oct 28, 2020 1:27 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Lecture 11
Replies: 2
Views: 52

Lecture 11

In Monday’s lecture, Professor Lavelle talked about how for multi-electron atoms after atomic # 20, 4s is higher energy than 3d but I’m still confused as to why. Could someone maybe clarify that please?
by Taylor K 2D
Sat Oct 24, 2020 9:31 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Sapling hw 11
Replies: 3
Views: 44

Re: Sapling hw 11

"ℓ" is the quantum number that represents the angular momentum of an electron. It is used to identify which orbital the electron is in (via shape). In this case, n=6 and ℓ=0 because in an s-orbital, ℓ=0. I hope that helps!
by Taylor K 2D
Sat Oct 24, 2020 9:26 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework 2, 3, 4
Replies: 3
Views: 58

Re: Homework 2, 3, 4

We can't really know for sure unless the professor posts the correct 19 questions :(
by Taylor K 2D
Thu Oct 22, 2020 3:37 pm
Forum: *Shrodinger Equation
Topic: Electron Density
Replies: 4
Views: 51

Re: Electron Density

Ok that makes more sense thank you so much!
by Taylor K 2D
Thu Oct 22, 2020 3:34 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Showing our Work on the Midterm
Replies: 10
Views: 106

Showing our Work on the Midterm

Does anyone know if we are allowed to have scratch paper on the midterm?
by Taylor K 2D
Wed Oct 21, 2020 6:13 pm
Forum: *Shrodinger Equation
Topic: Electron Density
Replies: 4
Views: 51

Electron Density

In lecture today, Professor Lavelle mentioned this equation briefly:

ψ²≡ e⁻ρ distribution

And I am very confused. I don’t really know what this means. Can someone please explain this to me?
by Taylor K 2D
Tue Oct 20, 2020 2:13 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation
Replies: 2
Views: 35

Re: Rydberg equation

I think its 1/lambda
by Taylor K 2D
Fri Oct 16, 2020 5:00 pm
Forum: DeBroglie Equation
Topic: Problem 1B.15
Replies: 3
Views: 52

Re: Problem 1B.15

I believe it is because kg is the fundamental SI unit for mass. But I'm not sure.
by Taylor K 2D
Thu Oct 15, 2020 9:10 pm
Forum: *Black Body Radiation
Topic: What is Black Body?
Replies: 35
Views: 572

Re: What is Black Body?

A black body is something that absorbs all light, but Lavelle said we didn't need to know that.
by Taylor K 2D
Wed Oct 14, 2020 6:15 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Spectral Lines
Replies: 2
Views: 45

Spectral Lines

I'm probably overthinking this, but I don't really understand how to determine the number of spectral lines based on given energy levels.
by Taylor K 2D
Tue Oct 13, 2020 1:54 pm
Forum: Properties of Light
Topic: Memorizing Wavelengths
Replies: 10
Views: 95

Memorizing Wavelengths

Will we need to memorize which wavelengths belong where on the spectrum/ which types of light correspond with which wavelength? If not do you think we'll be given access to this during the test?
by Taylor K 2D
Sun Oct 11, 2020 6:29 pm
Forum: Empirical & Molecular Formulas
Topic: Finding Empirical Formula
Replies: 10
Views: 100

Re: Finding Empirical Formula

Hi! Great question. Empirical formulas require whole numbers, so you wouldn’t be able to have, for example, an empirical formula of C1.5H2O4. If you get a ratio that doesn’t contain whole numbers, you have to multiply by a common number until all the numbers in the ration are whole numbers. So in th...
by Taylor K 2D
Fri Oct 09, 2020 9:49 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Stochiometric Coefficients
Replies: 6
Views: 63

Re: Stochiometric Coefficients

I don’t believe stoichiometric coefficients are measured in any units. They are just there to clarify the ratio of the products and the reactants.
by Taylor K 2D
Wed Oct 07, 2020 10:51 am
Forum: Significant Figures
Topic: How man Sig Figs to use in the Textbook Problems
Replies: 7
Views: 80

Re: How man Sig Figs to use in the Textbook Problems

HI! Great question! I believe the number of sig figs used in an answer is specific to the problem you are solving. For this reason, it is also important to remember the rules of determining sig-figs. Since there is no predetermined amount to use, you have to determine that for yourself. I wish there...
by Taylor K 2D
Mon Oct 05, 2020 8:00 pm
Forum: Limiting Reactant Calculations
Topic: Determining Limiting Reactant
Replies: 7
Views: 58

Re: Determining Limiting Reactant

Hi John! This is a great question! When finding a limiting reactant, I usually determine the moles of the respective reactants first. After that, I multiply each of the reactant's moles by their stoichiometric coefficient and dividing it by the stoichiometric coefficient of one of the products (what...
by Taylor K 2D
Mon Oct 05, 2020 3:24 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 231
Views: 118062

Re: Advice from a Medical Student [ENDORSED]

Thank you for these words of encouragement! It's great to know that these classes will not only be helpful now, but in the future as well!

Go to advanced search