Search found 80 matches

by Meghan Krushena 2E
Sun Feb 14, 2021 11:21 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: isochoric / isometric
Replies: 9
Views: 19

Re: isochoric / isometric

isochoric is a thermodynamic process during which the volume of the closed system undergoing such a process remains constant.

I believe isometric is similar to isochoric in that volume is constant but I do not remember discussing this term much (if at all) in lecture
by Meghan Krushena 2E
Sun Feb 14, 2021 11:17 pm
Forum: Student Social/Study Group
Topic: Spontaneous/Favorable
Replies: 4
Views: 13

Spontaneous/Favorable

Can spontaneous and favorable be used interchangeably? Or is there a difference between the two terms?
by Meghan Krushena 2E
Sun Feb 14, 2021 11:14 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: G° vs G
Replies: 25
Views: 72

Re: G° vs G

Dr. Lavelle's lecture slides stated that when ° is used it is referring to the state in standard conditions, so G is not at standard conditions with 1atm and 298K and G° is.
by Meghan Krushena 2E
Sun Feb 14, 2021 11:13 pm
Forum: Student Social/Study Group
Topic: Locked Question
Replies: 1
Views: 11

Locked Question

What does it mean if a previously asked question now says its locked? It was a general question and got plenty of replies so I was not sure if it was locked due to that or if something went wrong? And would this question still count toward my chemistry community participation points?
by Meghan Krushena 2E
Sun Feb 07, 2021 10:42 pm
Forum: Student Social/Study Group
Topic: Bonus Points
Replies: 2
Views: 13

Bonus Points

Anyone know if Dr. Lavelle is going to give another bonus question for Midterm 2? I know he only gave a bonus for Midterm 1 and not 2 in 14A but since the point distribution is even smaller for 14B (harder to get an A) I wasn't sure if he would help us out again for Midterm 2...
by Meghan Krushena 2E
Sun Feb 07, 2021 10:41 pm
Forum: Student Social/Study Group
Topic: Point Distribution
Replies: 1
Views: 18

Point Distribution

Is there any type of curve for this class (whether its stated or unstated)? Because I am looking at the point distribution and how many points one can miss on exams and it seems extremely challenging to get an A so I was not sure how this works due to the short exams and thus less total points?
by Meghan Krushena 2E
Sun Feb 07, 2021 10:40 pm
Forum: Student Social/Study Group
Topic: Midterm 2 Material
Replies: 2
Views: 19

Midterm 2 Material

What outlines does Midterm 2 cover? and I know with Midterm 1 we covered all the information a week before the exam (if I remember correctly), will this be the case for Midterm 2?
by Meghan Krushena 2E
Sun Feb 07, 2021 10:38 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Sapling #20
Replies: 9
Views: 48

Re: Sapling #20

For a system at constant volume

ΔU=q
by Meghan Krushena 2E
Sun Feb 07, 2021 10:33 pm
Forum: Student Social/Study Group
Topic: Post Midterm 1...
Replies: 39
Views: 175

Post Midterm 1...

I came out of midterm 1 extremely confident and felt like I had done everything I could to prepare myself for the exam. My solutions were well worked out and I had done every textbook question (and understood them for prep)...and I still scored below average. Does anyone have any tips? I feel so stu...
by Meghan Krushena 2E
Sun Feb 07, 2021 10:30 pm
Forum: Student Social/Study Group
Topic: Sapling wk 3/4 #18
Replies: 2
Views: 22

Sapling wk 3/4 #18

For question 18 on sapling week 3/4 homework could someone explain the relation that is discussed between Cv and Cp? I ended up getting the right answer but I simply deduced my 7/2 Cp to 5/2 through (educated??) guessing. Thank you!
by Meghan Krushena 2E
Sun Jan 31, 2021 8:38 pm
Forum: Student Social/Study Group
Topic: 14C and CL
Replies: 8
Views: 61

14C and CL

Since Spring course planning was just released on MyUcla, I was wondering if people were planning on taking 14C and 14CL at the same time, or if it is recommended to wait until after completing 14C?
by Meghan Krushena 2E
Sun Jan 31, 2021 8:36 pm
Forum: Student Social/Study Group
Topic: Wrong Group
Replies: 4
Views: 52

Wrong Group

I just realized that I've been posting my chemistry community questions for 14B this quarter in the 14A student social/study group...they still got accurate responses but I was wondering if I would still get credit for those posts?
by Meghan Krushena 2E
Sun Jan 31, 2021 8:33 pm
Forum: Student Social/Study Group
Topic: Midterm Grades
Replies: 15
Views: 87

Midterm Grades

Has Dr. Lavelle mentioned at all how long it will take before midterm grades are released?
by Meghan Krushena 2E
Sun Jan 31, 2021 8:32 pm
Forum: Student Social/Study Group
Topic: Work Life Balance
Replies: 44
Views: 174

Re: Work Life Balance

I feel you! If you feel you can, I've found that Soul Cycle has been really beneficial in helping me mentally and physically. Classes are only 45 min (covid safe) and includes mental healing during the workout! Would definitely recommend looking into it
by Meghan Krushena 2E
Tue Jan 26, 2021 12:00 pm
Forum: Student Social/Study Group
Topic: Textbook Q 5G3
Replies: 2
Views: 24

Textbook Q 5G3

This question asks to write K for the given equation. One of the products of the equation is 2 H2O (g). The solution includes the [H2O] in the equation for K. Is this because water is written as (g) in the reaction instead of (l)? Because I thought water was always excluded from equilibrium equation...
by Meghan Krushena 2E
Sun Jan 24, 2021 10:59 pm
Forum: Student Social/Study Group
Topic: Favorite Music
Replies: 104
Views: 308

Re: Favorite Music

Sometimes when I don't know what I want to listen to/am sick of my music I search up like Coffee shop beats and some cool Low-Fi playlists come up that really boost my concentration while studying!
by Meghan Krushena 2E
Sun Jan 24, 2021 10:57 pm
Forum: Student Social/Study Group
Topic: Average amount of study hours per week
Replies: 28
Views: 139

Re: Average amount of study hours per week

I don't think you should necessarily focus on the set amount of hours as it varies based on each person! Personally, this class is my hardest class and I do not pick up on the material as easily as in other classes, so I devote a good amount of hours per week, but that would not be the case for some...
by Meghan Krushena 2E
Sun Jan 24, 2021 10:54 pm
Forum: Student Social/Study Group
Topic: Exam Duration
Replies: 7
Views: 40

Exam Duration

I know the exam on Friday takes place during the scheduled lecture time, but will we be given any extra time to account for technology issues? Or is it a set 50 minutes?
by Meghan Krushena 2E
Sun Jan 24, 2021 10:32 pm
Forum: Student Social/Study Group
Topic: Midterm Study Tips
Replies: 41
Views: 169

Re: Midterm Study Tips

I found it most beneficial in 14A to do as many practice problems as possible! Redo sapling and the textbook problems and really talk yourself through the steps. A key aspect is to make sure you understand the process and are not just memorizing the steps, this helps for when conceptual questions ar...
by Meghan Krushena 2E
Sun Jan 24, 2021 10:30 pm
Forum: Ideal Gases
Topic: Acids & Bases
Replies: 6
Views: 47

Re: Acids & Bases

A salt will be basic if it contains the conjugate base of a weak acid, and a salt will be acidic if it contains the conjugate base of a weak base. That is what I mostly use to refer to but this video from Khan Academy is also really helpful at teaching how to distinguish whether a salt is acidic, ba...
by Meghan Krushena 2E
Sun Jan 17, 2021 10:51 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q > K, Q< K
Replies: 25
Views: 100

Re: Q > K, Q< K

Whether Q is greater than or less than K indicates the direction of the equation. So, if Q<K the concentration of the products is less than the concentration of the reactants compared to equilibrium, so the reaction moves from R --> P, or "shifts right"! and vice versa
by Meghan Krushena 2E
Sun Jan 17, 2021 10:49 pm
Forum: Student Social/Study Group
Topic: Sapling #10
Replies: 1
Views: 12

Sapling #10

Could someone explain the last part of #10 for the sapling homework? I got a Kc of 11.2 and created my ICE table and then Kc equation, but for some reason when I use the quadratic formula I get x=6.4701 and when I substitute that in my answers are not right.
by Meghan Krushena 2E
Sun Jan 17, 2021 10:46 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Temperature and Kc
Replies: 5
Views: 25

Re: Temperature and Kc

Sapling explains this really well: A positive change in enthalpy indicates an endothermic reaction. For endothermic reactions, an increase in temperature causes an increase in K. The reaction quotient is not affected by the temperature change, since there is no change in concentrations. A negative c...
by Meghan Krushena 2E
Sun Jan 17, 2021 10:44 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling WK 2 #10
Replies: 3
Views: 16

Re: Sapling WK 2 #10

Kc only changes when there is a change in temperature!
by Meghan Krushena 2E
Sun Jan 17, 2021 8:01 pm
Forum: Student Social/Study Group
Topic: Sapling Homework
Replies: 6
Views: 35

Sapling Homework

What happens if we hit 'Give Up' for a question on the sapling homework? I have been working on one problem over and over and cant figure out what I am doing wrong so that button is tempting...
by Meghan Krushena 2E
Sun Jan 10, 2021 10:57 pm
Forum: Student Social/Study Group
Topic: Chemistry Community Posts
Replies: 6
Views: 32

Chemistry Community Posts

Are chemistry community posts graded weekly (5 due Sunday by midnight) or by the total number of posts at the end of the quarter?
by Meghan Krushena 2E
Sun Jan 10, 2021 10:55 pm
Forum: Student Social/Study Group
Topic: Favorite TV shows
Replies: 189
Views: 1226

Re: Favorite TV shows

Bridgerton!!! Super not related to chem but so fascinating! :)
by Meghan Krushena 2E
Sun Jan 10, 2021 10:47 pm
Forum: Student Social/Study Group
Topic: Sapling Homework
Replies: 15
Views: 56

Sapling Homework

Will sapling homework be due weekly for the whole quarter? For 14A I know it would be due every few weeks for multiple weeks instead of one week of material every week so I was wondering if the schedule for Sapling homework is different for this quarter?
by Meghan Krushena 2E
Sun Jan 10, 2021 10:46 pm
Forum: Student Social/Study Group
Topic: Answering Questions with Responses
Replies: 5
Views: 51

Answering Questions with Responses

Do we still get credit for our chemistry community posts if we answer a question that already has other replies? For example, many questions I'll read and want to answer, but when I scroll down to answer there are already other replies answering the topic, so I was wondering if we would still get cr...
by Meghan Krushena 2E
Sun Jan 10, 2021 10:43 pm
Forum: Student Social/Study Group
Topic: Exam Changes
Replies: 12
Views: 80

Exam Changes

Are the midterms exams taken at the same time by all students now? I know for 14A with Dr.Lavelle exams took placed during discussion section so it varied for students, but my impression from the syllabus was that all students will take the exam at once, is this correct?
by Meghan Krushena 2E
Wed Dec 16, 2020 4:59 pm
Forum: Student Social/Study Group
Topic: Final grades
Replies: 8
Views: 62

Final grades

When are final grades posted?
by Meghan Krushena 2E
Wed Dec 16, 2020 4:59 pm
Forum: Student Social/Study Group
Topic: Final grading
Replies: 8
Views: 90

Final grading

Is there partial credit given on the final?
by Meghan Krushena 2E
Wed Dec 16, 2020 4:58 pm
Forum: Student Social/Study Group
Topic: 14B Groupme
Replies: 12
Views: 127

Re: 14B Groupme

Yes! I dont have the link but I know the main 14A groupme just changed to 14B since the majority of the same people are taking it
by Meghan Krushena 2E
Wed Dec 16, 2020 4:57 pm
Forum: Student Social/Study Group
Topic: Course Evals
Replies: 18
Views: 137

Course Evals

What happens if we forgot to fill out course evals? My brain was in finals mode and I completely forgot....
by Meghan Krushena 2E
Sat Dec 12, 2020 3:00 pm
Forum: Student Social/Study Group
Topic: Taking the final on an iPad
Replies: 4
Views: 54

Taking the final on an iPad

Is there anyway to take the exam on an iPad if we still use respondus? Im not sure if Lavelle allows this or not but my computer has been having a lot of issues and Im worried about it crashing during the final.
by Meghan Krushena 2E
Sun Dec 06, 2020 11:04 pm
Forum: Student Social/Study Group
Topic: Study Methods
Replies: 8
Views: 61

Study Methods

Does anyone have like specific study methods that have really helped them on exams? I cant quite figure out what works best for me and did not perform very well on the midterms and am nervous for the final. I've tried a heavy focus on textbook and sapling problems and I tried creating a review guide...
by Meghan Krushena 2E
Sun Dec 06, 2020 11:02 pm
Forum: Student Social/Study Group
Topic: 14BL waitlist
Replies: 1
Views: 14

14BL waitlist

Does anyone know what it means if I am enrolled in 14BL but on the waitlist for my lab? Will I be placed in another lab if I do not get off the waitlist or will I not be enrolled in the class at all?
by Meghan Krushena 2E
Sun Dec 06, 2020 11:01 pm
Forum: Student Social/Study Group
Topic: 14BL
Replies: 2
Views: 13

14BL

Does anyone have any advice or know anything about when is best to take 14BL? I am taking 14B next quarter and it works best with my schedule/credits to take BL too but I have very little chem background so I was not sure if people say this is too much to take together?
by Meghan Krushena 2E
Sun Dec 06, 2020 11:00 pm
Forum: Student Social/Study Group
Topic: Recorded Reviews
Replies: 1
Views: 15

Recorded Reviews

Are any of the review sessions/Step Ups/UA workshops recorded? I know Lavelle makes sure to offer many hours to make sure people can attend but I wasn't sure if any of these sessions during week 10 would be recorded?
by Meghan Krushena 2E
Sun Dec 06, 2020 10:59 pm
Forum: Student Social/Study Group
Topic: Curve
Replies: 29
Views: 223

Curve

Is there a curve for this class? I remember in the 7 series there was usually some type of curve but I wasn't sure if there is a curve for this class?
by Meghan Krushena 2E
Sun Nov 29, 2020 7:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Distinguishing Shape from # of Bonds
Replies: 3
Views: 22

Distinguishing Shape from # of Bonds

If we are only given the coordinate number, which is equal to the number of bonds, how do we distinguish between various geometrical shapes with the same number of bonds? For example square planar and tetrahedral both have 4 bonds.
by Meghan Krushena 2E
Sun Nov 29, 2020 7:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: sigma vs pi bonds
Replies: 33
Views: 218

Re: sigma vs pi bonds

a sigma bond is a single bond that allows free rotation. A pi bond does not allow rotation along the internuclear axis. A double bond is consistent of one sigma bond and one pi bond, the order does not matter. A triple bond is one sigma bond and 2 pi bonds
by Meghan Krushena 2E
Sun Nov 29, 2020 7:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles
Replies: 7
Views: 47

Bond angles

In terms of determining bond angles, do we just look at the geometrical shape and take into account any lone pairs? Or are there more factors?
by Meghan Krushena 2E
Sun Nov 29, 2020 7:44 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 5
Views: 45

Re: Ligands

So if all ligands are Lewis bases, does that mean all transitional metals are cations? Or can Lewis base ligands only bond with cation transitional metals?
by Meghan Krushena 2E
Sun Nov 29, 2020 7:40 pm
Forum: Student Social/Study Group
Topic: Expanded Octet
Replies: 4
Views: 37

Expanded Octet

I am still struggling at determining which atoms can accommodate an expanded octet. For example, in #20 of the week 7/8 sapling homework, we had to draw the Lewis structure for AsO4^-3. The correct answer shows As as having a total of 5 bonds (3 single + 1 double). How do I know when drawing the Lew...
by Meghan Krushena 2E
Sun Nov 22, 2020 11:09 pm
Forum: Student Social/Study Group
Topic: Molecule shape
Replies: 1
Views: 40

Molecule shape

So I understand the different shapes of molecules and their names, but I wasn't sure if the exact layout of the molecule matters. Like using a dotted line for distance and solid for facing toward us, can we change the angle at which we are viewing/drawing the model? Or are their certain molecules th...
by Meghan Krushena 2E
Sun Nov 22, 2020 11:06 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent Bonds
Replies: 7
Views: 32

Re: Ionic and Covalent Bonds

Another good trick at visually determining whether a bond is ionic or covalent is to look at the the locations of the atoms on the periodic table. Generally, atoms close together will have mainly covalent bond characteristics, and atoms far apart will have mainly ionic bond characteristics.
by Meghan Krushena 2E
Sun Nov 22, 2020 11:04 pm
Forum: Coordinate Covalent Bonds
Topic: Non-charged molecules becoming Lewis acids/bases
Replies: 3
Views: 43

Re: Non-charged molecules becoming Lewis acids/bases

Just wanted to confirm what everyone else has brought up...just because an atom appears to have no net charge, it can still be a Lewis acid or base because it does not have a full octet of electrons. An atom with lone pair electrons will become a Lewis base and donate the electrons in order get rid ...
by Meghan Krushena 2E
Sun Nov 22, 2020 4:33 pm
Forum: Student Social/Study Group
Topic: Study Tips for Final Exam
Replies: 57
Views: 467

Re: Study Tips for Final Exam

I cannot stress this enough: The Organic Chemistry Tutor on youtube makes the best videos!! Super helpful and great for studying
by Meghan Krushena 2E
Sun Nov 22, 2020 4:32 pm
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving week lectures
Replies: 5
Views: 63

Re: Thanksgiving week lectures

Im guessing that Wednesday discussions and recorded lectures are being held but I do not think there are discussions Thurs/Fri but make sure to check with your TA
by Meghan Krushena 2E
Sun Nov 15, 2020 10:17 pm
Forum: Student Social/Study Group
Topic: Midterm 2 content
Replies: 20
Views: 178

Midterm 2 content

Are there any equations we need to know for midterm 2? Like I understand all the rules and trends we need to know, but I wasn't sure if we need to know Shrodingers Equation or any other equations...like are there going to be calculation problems?
by Meghan Krushena 2E
Sun Nov 15, 2020 10:15 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Determining Number of Orbitals
Replies: 3
Views: 43

Re: Determining Number of Orbitals

Okay so this confused me a little as well but I think I understand part C at least. When n = 2, it can have the sub shell of p (so l = 1) or s (so l = 0). Within these subshells, there are different number of orbitals. n=2 and l = 0 only has the 0 orbital (so we have +1). Then, for n =2 and l =1, th...
by Meghan Krushena 2E
Sun Nov 15, 2020 10:11 pm
Forum: Formal Charge and Oxidation Numbers
Topic: oxidation numbers
Replies: 4
Views: 60

Re: oxidation numbers

Oxidation numbers, I believe, are the total number of electrons that an atom either gains or loses when forming a bond with another atom
by Meghan Krushena 2E
Sun Nov 15, 2020 10:05 pm
Forum: Electronegativity
Topic: Periodic Table Trends
Replies: 9
Views: 128

Re: Periodic Table Trends

Hi! I know people have already answered the question, but I was struggling with keeping everything straight too with all the trends. If you're having this same issue I found it really helpful to print out a copy of the periodic table and draw arrows for all the trends. I used this doing practice tex...
by Meghan Krushena 2E
Sun Nov 15, 2020 10:03 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: Ionic Bond vs. Hydrogen Bonding
Replies: 10
Views: 69

Re: Ionic Bond vs. Hydrogen Bonding

Ionic bonds are stronger than Hydrogen bonds, which means it takes a higher boiling point to break the bond. So, if I am correct, the stronger the ionic bonds between the two atoms the higher the boiling point, and since hydrogen bonds aren't very strong those molecules tend to have lower boiling po...
by Meghan Krushena 2E
Sun Nov 08, 2020 11:36 pm
Forum: Ionic & Covalent Bonds
Topic: HW Question
Replies: 4
Views: 66

Re: HW Question

The answer would be London dispersion forces and dipole-dipole forces only due to the London dispersion forces always being present, and the polarity of the molecule caused by C and H which means dipole-dipole forces are present.
by Meghan Krushena 2E
Sun Nov 08, 2020 11:33 pm
Forum: Resonance Structures
Topic: Delocalized
Replies: 5
Views: 47

Re: Delocalized

In addition, by definition delocalized electrons are free to move across more than one bond, whereas localized electrons are tied to atoms as lone pairs or in set covalent bonds.
by Meghan Krushena 2E
Sun Nov 08, 2020 11:32 pm
Forum: Student Social/Study Group
Topic: Midterm 2
Replies: 28
Views: 198

Re: Midterm 2

Hi! I also did not do too well on Midterm 1. Some things I'm doing differently for midterm 2 are really making sure I learn as I go along, for example, when new material started to be introduced, I printed out periodic tables and made one for the trends, one of the lewis dot structures, one of the e...
by Meghan Krushena 2E
Sun Nov 08, 2020 11:19 pm
Forum: Student Social/Study Group
Topic: Class grade
Replies: 18
Views: 170

Re: Class grade

Just wanted to confirm that the only way to change to pass/no pass is through my.ucla! Its not official any other way, but make sure you check within the requirements of your major that you can take this pass/no pass because a lot of STEM majors have required letter grades for pre-major classes such...
by Meghan Krushena 2E
Sun Nov 08, 2020 11:17 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Study material
Replies: 2
Views: 53

Re: Study material

Hi! I did not take AP Chem in high school so I have struggled with some of the more basic topics too. I have found youtube videos to be super helpful and great resources. One account called Organic Chemistry Tutor makes good videos, alongside with Khan Academy which has videos and other resources fo...
by Meghan Krushena 2E
Sun Nov 01, 2020 11:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Scores
Replies: 28
Views: 272

Re: Midterm Scores

Dr. Lavelle has not stated anything specific regarding midterm scores yet. I know some TA's said scores would be posted after the last discussion section took the exam, but I also heard that there is a possibility for partial credit, which might mean the grading will take a few days.
by Meghan Krushena 2E
Sun Nov 01, 2020 11:31 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Sapling HW #10
Replies: 2
Views: 39

Re: Sapling HW #10

Yes! You are doing it right! I am pretty sure the only reason that it is saying its wrong is because your answer is in meters so just convert is to nanometers and you should be good to go!
by Meghan Krushena 2E
Sun Nov 01, 2020 11:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Sapling Glitch?
Replies: 3
Views: 38

Sapling Glitch?

Is anyone else having a glitch on sapling where when you submit an answer it says that its taken you way more attempts than you actually did? Like I would submit an answer for the first or second try and it says like solved after 8 attempts? I know it doesn't affect your grade how many attempts you ...
by Meghan Krushena 2E
Sun Nov 01, 2020 11:26 pm
Forum: General Science Questions
Topic: Sapling #24
Replies: 1
Views: 23

Sapling #24

Hello! For Sapling question #24 ("Identify the reasons why oxygen has a lower first ionization energy than both nitrogen and fluorine, I understand why the two correct answers are right, but could someone break down/explain the other answer choice that says "the 2p electrons in fluorine ar...
by Meghan Krushena 2E
Sun Nov 01, 2020 11:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Grading
Replies: 4
Views: 42

Midterm Grading

First off congrats to everyone for finishing midterm 1! yay! I was curious if someone knew how grading would work for the exam since it was all multiple choice but noticed for some questions the answer choices included answers for possible mistakes. For example, if the question asked to find the mol...
by Meghan Krushena 2E
Sun Oct 25, 2020 10:53 pm
Forum: Properties of Electrons
Topic: Kinetic energy for electrons
Replies: 3
Views: 43

Re: Kinetic energy for electrons

I do not know if there are set rules to know for when the kinetic energy would be zero in this case, but in lecture one of the examples problems used either this formula or a similar one involving Ek (I cant remember exactly) and it was given in the question that the kinetic energy was zero, so I wo...
by Meghan Krushena 2E
Sun Oct 25, 2020 10:50 pm
Forum: Properties of Electrons
Topic: Work Function
Replies: 3
Views: 40

Re: Work Function

If you are given other information it is possible (I believe, correct me if I'm wrong) to calculate the work function using the Kinetic Energy formula where: Ek = Ephoton - Eremovee- This equation directly translates to... Ek = (hv) - work function (*note the v is frequency not velocity, this comes ...
by Meghan Krushena 2E
Sun Oct 25, 2020 10:46 pm
Forum: Quantum Numbers and The H-Atom
Topic: Rydberg constant
Replies: 7
Views: 81

Re: Rydberg constant

I am not sure why it is not consistent, but the reason for the two different numbers is the units it is in. When R=3.28984 x 10^15 it is in Hertz (given on the equation/constant sheet) but the number that appears on sapling (1.097 x 10^7) is in meters. Hope this helps!
by Meghan Krushena 2E
Sun Oct 25, 2020 10:41 pm
Forum: Properties of Light
Topic: Is c always the speed of light?
Replies: 88
Views: 509

Re: Is c always the speed of light?

As far as we have learned (unless someone correct me if I am wrong), c is a constant that will always be the set number equal to the speed of light. A constant is an unchanging number, thus c will always be the same value and will always represent that value as the speed of light. The only possibili...
by Meghan Krushena 2E
Sun Oct 25, 2020 10:39 pm
Forum: Student Social/Study Group
Topic: Study Approaches
Replies: 4
Views: 51

Study Approaches

Hi everyone! Lately I have been feeling very overwhelmed with the amount of resources given to us as the midterm approaches. Does anyone else feel this way or have any advice? Its almost like I cant decide how to approach studying for the midterm that I end up doing bits and pieces of different proj...
by Meghan Krushena 2E
Sun Oct 18, 2020 6:26 pm
Forum: General Science Questions
Topic: Calculating deltaE for non H-atoms
Replies: 1
Views: 32

Calculating deltaE for non H-atoms

Dr. Lavelle discussed in Friday's lecture how deltaE = - hR/n^2 can only be used when looking at H-atoms (if I misunderstood this statement, please correct me). Would we ever be asked to solve for a non H-atom? If so how would we go about doing that? Is there a different formula that accommodates to...
by Meghan Krushena 2E
Sun Oct 18, 2020 6:21 pm
Forum: Administrative Questions and Class Announcements
Topic: Exam format
Replies: 1
Views: 16

Exam format

Due to the now online exams, is our exam modified at all to fit the online learning format? Or is this the same exam, with the same timing, that we would have been taking in an in person class? Meaning, is the format of the exam and its time distribution adjusted to fit to unique needs of online lea...
by Meghan Krushena 2E
Sun Oct 18, 2020 6:19 pm
Forum: General Science Questions
Topic: External Webcam/Exam procedure
Replies: 4
Views: 37

External Webcam/Exam procedure

Can someone explain to me why people are inquiring about buying an external webcam? I am a little confused about the set up for the midterm because if we are required to be on Zoom and use respondus, would we just be able to use our phone for zoom? Is that why an external webcam would be needed, or ...
by Meghan Krushena 2E
Sun Oct 18, 2020 6:15 pm
Forum: General Science Questions
Topic: Sig Figs
Replies: 14
Views: 99

Re: Sig Figs

Another good tip for Sig Figs is to put your answer in the same amount of Sig Figs as the numbers that are given in the question...for example if we are given in a number in the question with 3 Sig Figs, round/write your answer so it has the same amount. If you get marked down for incorrect Sig Figs...
by Meghan Krushena 2E
Sun Oct 18, 2020 6:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Exam
Replies: 7
Views: 77

Re: Exam

I am not sure on the exact protocol, but my input is that considering we need to know the mass of elements (such as Carbon, Oxygen, etc) we will either be allowed to have a physical periodic table, or we will be given any masses necessary in the question. As for your iPad, I doubt we will be allowed...
by Meghan Krushena 2E
Sun Oct 11, 2020 10:01 pm
Forum: SI Units, Unit Conversions
Topic: Showing Unit Conversions in work
Replies: 7
Views: 107

Re: Showing Unit Conversions in work

I don't think that you would ever be marked down for not including all exact conversion units, but it is definetly an easy step that helps avoid silly mistakes. I'm usually lazy with units too but I've found that in the past ( my high school chemistry) it is easier to get partial points or figure ou...
by Meghan Krushena 2E
Sun Oct 11, 2020 9:59 pm
Forum: Student Social/Study Group
Topic: High School Chemistry Review/Resources
Replies: 6
Views: 89

High School Chemistry Review/Resources

Hi! I know Dr. Lavelle posted a lot of resources to review high school fundamental concepts, but my high school chemistry was basic and slightly unorthodox in the topics covered so I was wondering if anyone has any resources (other than videos/etc that come from Dr. Lavelle) that they found useful o...
by Meghan Krushena 2E
Sun Oct 11, 2020 9:57 pm
Forum: General Science Questions
Topic: Step Up Session Question
Replies: 5
Views: 82

Step Up Session Question

Since there are so many available step up sessions I was confused on if each session does the same problems every week, or if each session is different. I went to one last year and was not sure if it is beneficial to attend more than one session per week or if the sessions on different days within t...
by Meghan Krushena 2E
Sun Oct 11, 2020 9:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Sapling Homework
Replies: 5
Views: 52

Re: Sapling Homework

There is a little green bar on the left side of the screen that shows your % completion as you work, once that hits 100% you're all set! No need for any further submission after completion.
by Meghan Krushena 2E
Sun Oct 11, 2020 9:44 pm
Forum: Significant Figures
Topic: Sig Fig for numbers like 200, 3300, 4000
Replies: 6
Views: 49

Re: Sig Fig for numbers like 200, 3300, 4000

200 versus 200.00 actually makes a very big difference in terms of Sig Figs and the significance of zero. For 200 alone, the zeros do not count as significant and there is only 1 Sig Fig (the 2), whereas the inclusion of a decimal causes the zeros, as well as the original non zero numbers, to be sig...

Go to advanced search