Search found 67 matches

by Sandra Kim 2B
Tue Jan 19, 2021 7:55 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: initial molarity situations?
Replies: 3
Views: 8

initial molarity situations?

Can someone explain to me why sometimes the [H30+] or [OH-] are assumed to have the same initial molarity as the given reactant and how can I tell this will occur when I'm given the reactant and its molarity? (I happened to do 6E1 wrong at first because I carelessly went right ahead solving it witho...
by Sandra Kim 2B
Mon Jan 18, 2021 8:55 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6D9
Replies: 1
Views: 16

6D9

when finding Ka of benzoic acid in a .110M solution with 2.4% percentage deprotonation, what goes in the denominator for the Ka equation? i already know that the numerator is (.00264)^2 but could someone explain what numbers would go in the denominator and why?
by Sandra Kim 2B
Sun Jan 17, 2021 5:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Textbook Problem 6D5
Replies: 1
Views: 25

Textbook Problem 6D5

For the parts in 6D5, how would we find Kb in order to get the value of x ([OH-])? I'm not sure where to go after I made the Kb equation since I only have the molarity of the reactants :/
by Sandra Kim 2B
Sat Jan 16, 2021 8:01 pm
Forum: Student Social/Study Group
Topic: Best Workshops
Replies: 8
Views: 51

Re: Best Workshops

I personally like Hannah Chew! She's really helpful when it comes to questions you may have and going thru the processes imo
by Sandra Kim 2B
Sat Jan 16, 2021 12:48 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pH of conjugate acid/base
Replies: 3
Views: 28

Re: pH of conjugate acid/base

i'm pretty sure finding the pH of a conjugate wouldn't be asked on like an exam since pH is more based on the solution as a whole. I would assume that the strength of it would be considered more rather than pH.
by Sandra Kim 2B
Fri Jan 15, 2021 4:51 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Textbook Problem 5.35
Replies: 2
Views: 14

Textbook Problem 5.35

When calculating the equilibrium constant for problem 5.35, how do you know that each value was a hundredth on the graph? Why isn't it just Pb=5, Pc=10, and Pa=18?
by Sandra Kim 2B
Wed Jan 13, 2021 8:36 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Textbook problem 5J5 (d)
Replies: 2
Views: 24

Textbook problem 5J5 (d)

For letter d of textbook problem 5J5, it said that there was no change to 2HD(g) + H2(g) ⇌ D2(g) when the total pressure increases because there was the same number of moles on each side of the equation. When I look at it, it doesn't look like they have the same number of moles? So I'm pretty confus...
by Sandra Kim 2B
Sun Jan 10, 2021 10:56 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Sapling Week 1&2 Homework Question
Replies: 8
Views: 74

Re: Sapling Week 1&2 Homework Question

based on what was said in the module 4 video, exothermic reactions (releases heat) shift to the right/products and K increases while endothermic reactions (uses up heat) shift to the left/reactants and K decreases. so, you would have to determine the type of reaction it is first if you wanted to see...
by Sandra Kim 2B
Sat Jan 09, 2021 11:51 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sign of x in ICE Box
Replies: 8
Views: 31

Re: Sign of x in ICE Box

^i agree with the person who posted above for forwards reactions but would it be different for chemical reactions that are reverse reactions? or do problems generally not consider reverse reactions?
by Sandra Kim 2B
Sat Jan 09, 2021 6:40 pm
Forum: Ideal Gases
Topic: value of R
Replies: 24
Views: 74

Re: value of R

if you're worried that different units will be on the test for constant R, don't worry! on the constants and equations sheet that we are allowed to use during tests, Dr. Lavelle put the value of R for many different units! you can find the sheet on the 14b website :)
by Sandra Kim 2B
Fri Jan 08, 2021 7:09 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Stability
Replies: 8
Views: 46

Stability

Just to make sure, are products more stable than reactants when Q<K (forward reaction) and reactants more stable when Q>K (reverse reaction)? Also, is this notion about stability applicable when K is large or small respectively?
by Sandra Kim 2B
Thu Jan 07, 2021 10:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Proctored Exam?
Replies: 13
Views: 91

Re: Proctored Exam?

I didn't have Dr. Lavelle for 14A and was wondering how tests were formated as well as any other tips to better prepare for the tests? from what i learned from chem 14a with lavelle, what really helps to prepare for the tests is to do the textbook problems in the syllabus and to review them. also, ...
by Sandra Kim 2B
Tue Jan 05, 2021 1:45 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Module Part 2 #29
Replies: 2
Views: 18

Module Part 2 #29

A researcher fills a 1.00 L reaction vessel with 1.84 x 10^-4 mol of BrCl gas and heats it to 500 K. At equilibrium, only 18.3 % of the BrCl gas remains. Calculate the equilibrium constant, assuming the following reaction is taking place. 2BrCl(g) ⇌ Br2 (g) + Cl2(g) I came across a pretty old chemis...
by Sandra Kim 2B
Fri Dec 11, 2020 8:37 pm
Forum: Student Social/Study Group
Topic: Thoughts on Switching Majors?
Replies: 30
Views: 239

Re: Thoughts on Switching Majors?

I originally came in as a Labor Studies major because that's what I put on my application, but I tried to change to Marine Biology at New Student Orientation. Unfortunately the change doesn't seem to have gone through :/ Oh nooo do you know why it didn't go through? I'm a bit worried that my (poten...
by Sandra Kim 2B
Fri Dec 11, 2020 12:05 am
Forum: Polyprotic Acids & Bases
Topic: Calculations of Ka and Kw
Replies: 3
Views: 42

Re: Calculations of Ka and Kw

I feel like a problem where we actually have to calculate something using it won't appear on the final but it would be something to keep in mind for 14b. but maybe knowing the concept of its relation to acidity could come in handy.
by Sandra Kim 2B
Thu Dec 10, 2020 11:58 pm
Forum: Hybridization
Topic: Hybridization (NH3 vs C2H2)
Replies: 2
Views: 29

Re: Hybridization (NH3 vs C2H2)

I think he meant to say that each individual C atom in the C2H2 are sp hybridized (2 bonding regions on each C atom) and as a whole, the molecule has sp2 hybridization. since NH3 only has one N atom, it is solely labeled as sp3 hybridized with N's three bonds and one LP. you could also note that eac...
by Sandra Kim 2B
Thu Dec 10, 2020 11:51 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Strong Acid Question
Replies: 2
Views: 31

Re: Strong Acid Question

One way to distinguish the strength of the acidity between two acids is to look at the bond lengths of H-bonds based on atomic radii (bigger radii-> longer+weaker bond-> more acidic since it loses the H-atom more easily). Another thing to look at is the electronegativity of the compound based on the...
by Sandra Kim 2B
Tue Dec 08, 2020 10:07 pm
Forum: Student Social/Study Group
Topic: Plans for Relaxing After Finals
Replies: 97
Views: 451

Re: Plans for Relaxing After Finals

I know I'm going to be binging a bunch of games with my friends for hours straight once winter break comes :) Even though it's just two weeks, I want to indulge in it as much as I can.
by Sandra Kim 2B
Tue Dec 08, 2020 10:05 pm
Forum: Bronsted Acids & Bases
Topic: 100% ionized
Replies: 3
Views: 13

100% ionized

Just a bit confused but what does it mean when an acid/base is completely/partially ionized in water and how does this relate to how strong/weak an acid/base is?
by Sandra Kim 2B
Tue Dec 08, 2020 4:31 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6B1
Replies: 3
Views: 54

6B1

6B asks for the difference in the pH values of the two solutions when the molar concentration of HCl in hydrochloric acid is reduced to 12% of its initial value by dilution. I'm not even sure how to start this problem; how do you approach a problem where the solution is being diluted and being reduc...
by Sandra Kim 2B
Tue Dec 08, 2020 2:04 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 25 degrees celsius [ENDORSED]
Replies: 6
Views: 37

25 degrees celsius [ENDORSED]

What's the importance of saying that the solution is at 25 degrees celsius? I've seen it in a lot of problems on calculating pH and I was not sure why it specified that.
by Sandra Kim 2B
Sun Dec 06, 2020 5:21 pm
Forum: Naming
Topic: 9C3 (a) and (c)
Replies: 2
Views: 24

Re: 9C3 (a) and (c)

(a) Potassium hexacyanidochromate (III) is written as K 3 [Cr(CN) 6 ]. We know that Cr has a charge of +3 because of the Roman numeral (III) we see in its name. We also know that (CN) always has a charge of -1. Since there are six (CN) - and one Cr +3 , the overall charge is [Cr(CN) 6 ] -3 . And si...
by Sandra Kim 2B
Sat Dec 05, 2020 12:24 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: ligand names
Replies: 10
Views: 63

ligand names

not sure if this was asked already but are we going to be expected to remember the names of ligands for the final/in general (like en, edta, oxalato, etc.)?
by Sandra Kim 2B
Sat Dec 05, 2020 12:12 am
Forum: Naming
Topic: 9C3 (a) and (c)
Replies: 2
Views: 24

9C3 (a) and (c)

for textbook problems 9C3 (a) and (c), it gives potassium hexacyanidochromate(III) and tetraamminediaquacobalt(III) bromide respectively, and told us to write the formula for them. the potassium in (a) was K3 and the bromide in (c) was Br3. How would you figure out that there were three of those ato...
by Sandra Kim 2B
Fri Dec 04, 2020 5:00 pm
Forum: Student Social/Study Group
Topic: How are you?
Replies: 111
Views: 754

Re: How are you?

like some people have said, i feel like i'm a little behind on classes and prep for finals but also a bit fatigued when i barely have any friends (if at all) in my classes this quarter, so i haven't really had anyone close to reach out to. but in the end, i know the last two weeks will fly by super ...
by Sandra Kim 2B
Fri Dec 04, 2020 4:53 pm
Forum: Student Social/Study Group
Topic: Thoughts on Switching Majors?
Replies: 30
Views: 239

Re: Thoughts on Switching Majors?

Hi there! It's only been a quarter, but there's honestly no problem with switching your major at anytime (as long as you have enough time to finish your lower divisions and upper divisions). Just make sure to pursue something that aligns with your interests and that you are healthy and taking care ...
by Sandra Kim 2B
Wed Dec 02, 2020 4:11 pm
Forum: Student Social/Study Group
Topic: Thoughts on Switching Majors?
Replies: 30
Views: 239

Thoughts on Switching Majors?

the quarter's about to end and i was wondering if anyone is going to/thinking about switching majors! honestly, it's only been one quarter yet i'm realizing more and more that maybe choosing a stem major to please my parents wasn't that great of an idea... and i know switching majors is pretty commo...
by Sandra Kim 2B
Sun Nov 29, 2020 1:20 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: formation of coordination compounds
Replies: 3
Views: 47

Re: formation of coordination compounds

i think this might be how ion-dipole interactions are stronger than dipole-dipole interactions. (but i am also not too sure; there could be more to it)
by Sandra Kim 2B
Sun Nov 29, 2020 1:08 pm
Forum: Hybridization
Topic: 2F17
Replies: 3
Views: 36

Re: 2F17

the s character is the s orbital's contribution in hybridization. This is basically the bond angle from what I can find. So an increase in the s character I believe would = an increase in bond angle because they are proportional. to correct myself, s character isn't the same as bond angle so my sec...
by Sandra Kim 2B
Fri Nov 27, 2020 1:54 am
Forum: Hybridization
Topic: 2F17
Replies: 3
Views: 36

2F17

for textbook problem 2F17, it asks how an increase in s-character in a hybrid would affect its bond angle. Does anyone know what they meant by "s-character" (i just don't recall ever hearing this term) and how its increase would increase the bond angle rather than decrease?
by Sandra Kim 2B
Mon Nov 23, 2020 7:42 pm
Forum: Octet Exceptions
Topic: octet expansions
Replies: 2
Views: 17

octet expansions

In the recent lecture, Dr. Lavelle said that octet expansion involves d-orbitals but I feel like I have seen instances where elements like Si, P, and S have had expanded octets in their Lewis structures. Where do the d-orbitals come into play with these elements in the 3p orbital or is my brain mess...
by Sandra Kim 2B
Mon Nov 23, 2020 6:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 337
Views: 139568

Re: Saying Thank You to Dr. Lavelle

Hello Dr. Lavelle! I just wanted to let you know that the "water on Mars" joke at the end of one of your lectures made me genuinely smile during a long depressive episode. I think it was the first time I really smiled for a while when that happened and I truly always appreciate the positiv...
by Sandra Kim 2B
Fri Nov 20, 2020 6:54 pm
Forum: Student Social/Study Group
Topic: Study Tips for Final Exam
Replies: 57
Views: 410

Re: Study Tips for Final Exam

Revisiting past textbook and sapling problems along with the notes are probably going to be the biggest form of studying for me since it's hard to go to the UA sessions (just personally can't; though I do hear great things about them!) I wish everyone good luck studying when the time comes around :)
by Sandra Kim 2B
Mon Nov 16, 2020 9:43 pm
Forum: Dipole Moments
Topic: 3F5
Replies: 3
Views: 19

3F5

For part b of 3F5, it said that butanol (C4H9OH) had H-bonding when diethyl ether (C2H5OC2H5) didn't, which made butanol have a higher melting point. I was wondering if anybody knows how you would know one would have H-bonding and one wouldn't when it seems like both would or how you would tell in g...
by Sandra Kim 2B
Mon Nov 16, 2020 8:17 pm
Forum: Trends in The Periodic Table
Topic: Periodic Trends Summarized
Replies: 6
Views: 70

Re: Periodic Trends Summarized

based on the lectures: atomic/ionic radii: increases down (more shells=e- farther from nucleus), decreases across (more nuclear charge pulls e- closer) ionic radii: cations smaller than parent/anion larger than parent ionization energy: decreases down (bigger size=farther e-=less energy req.), incre...
by Sandra Kim 2B
Mon Nov 16, 2020 8:08 pm
Forum: Lewis Structures
Topic: Lewis Structure of PCl3
Replies: 3
Views: 23

Re: Lewis Structure of PCl3

^ yup and also in general, you shouldn't give your halogens a double bond since it would lead to it having a +1 charge instead of its usual -1 charge which would make it more reactive which is bad
by Sandra Kim 2B
Fri Nov 13, 2020 9:57 pm
Forum: Resonance Structures
Topic: Resonance Hybrids
Replies: 2
Views: 21

Re: Resonance Hybrids

generally, you shouldn't make your halogens, like Cl, have a double bond because that would make it have a +1 charge which would make it more unstable (most halogens have a -1 charge to make it stable like a noble gas yk?) so that's why you can only make the resonance structures differ between the O...
by Sandra Kim 2B
Fri Nov 13, 2020 2:56 am
Forum: Lewis Acids & Bases
Topic: Molecules With Polar Double Bonds
Replies: 5
Views: 51

Re: Molecules With Polar Double Bonds

I was having a hard time with the Lewis acids and bases too, can someone please explain the difference. it helps to have a visual structure of the molecules/atoms so you can see whether there are any lone pair electrons that can be shared (Lewis base) or if it's deficient in electrons (Lewis Acid)....
by Sandra Kim 2B
Fri Nov 13, 2020 2:47 am
Forum: Lewis Acids & Bases
Topic: Molecules With Polar Double Bonds
Replies: 5
Views: 51

Re: Molecules With Polar Double Bonds

i think when a molecule has polar double bonds, it has a higher polarizing power (the atom's ability to pull electrons to it) which makes it a Lewis acid (since it would take the electron pair). hope this helped a little :)
by Sandra Kim 2B
Fri Nov 13, 2020 2:30 am
Forum: Student Social/Study Group
Topic: grade worries
Replies: 110
Views: 1171

Re: grade worries

i'm also definitely worried about the grade in general but i wouldn't stay too stressed considering you only need 50% to pass the class. i know it's not ideal to set standards that low haha but knowing that we have that kind of safety net (?) to at least pass is pretty reassuring and decreases the w...
by Sandra Kim 2B
Tue Nov 10, 2020 8:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Question for Students about High School Chem
Replies: 25
Views: 122

Re: Question for Students about High School Chem

I'm in the same boat! I took regular hs chem in 10th grade and definitely haven't seen a lot of the stuff that's been taught this quarter before while just vaguely remembering the stuff in the fundamentals :(
by Sandra Kim 2B
Tue Nov 10, 2020 8:38 pm
Forum: Administrative Questions and Class Announcements
Topic: 14B Next Quarter
Replies: 8
Views: 130

Re: 14B Next Quarter

Massimo_Capozza_1H wrote:If it doesn't fit in our schedule can we still take 14B spring semester or do we have to wait?

I'm pretty sure the class itself would be available spring quarter but I would take into consideration that it might not be Dr. Lavelle teaching it
by Sandra Kim 2B
Mon Nov 09, 2020 5:33 pm
Forum: Student Social/Study Group
Topic: Mid-quarter Check in
Replies: 67
Views: 278

Re: Mid-quarter Check in

pretty hard to keep up when it's all online and surrounded by distractions haha :) and not doing so well but it is what it is :/ i'll have to change my habits or something for next quarter somehow
by Sandra Kim 2B
Mon Nov 09, 2020 4:37 pm
Forum: Student Social/Study Group
Topic: Discord/Group me
Replies: 3
Views: 26

Re: Discord/Group me

here's the discord!
https://discord.gg/PBKZEzcF
by Sandra Kim 2B
Fri Nov 06, 2020 10:07 pm
Forum: Student Social/Study Group
Topic: Making it through Midterm Results
Replies: 13
Views: 141

Re: Making it through Midterm Results

I didn't do so hot either LOL although it was hard to not beat myself up over it, it's definitely motivation to prepare myself better for the next one. It's also nice to consider this as a good warning about how future midterms could be like and how fast the quarter system is since I'm just a freshm...
by Sandra Kim 2B
Thu Nov 05, 2020 11:43 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1D23
Replies: 3
Views: 25

Re: 1D23

The reason why there's only one orbital is because of the third quantum number. The third quantum number will specify which orbital you're in. We don't know what orbital +1 is referring to (since there's no set standard for ml numbers...for example +1 could be 3dxy or 3dxz), but we know it's referr...
by Sandra Kim 2B
Tue Nov 03, 2020 11:09 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1D23
Replies: 3
Views: 25

1D23

For letter d of 1D23 in the textbook, the solutions manual says that there's only 1 orbital for an atom with quantum numbers n=3, l=2, ml=+1. At first, I thought it would have been 4 orbitals since l=2 has -2, -1, 0, +1, +2, so up to +1 would have been 4 orbitals. Can someone tell me what's incorrec...
by Sandra Kim 2B
Tue Nov 03, 2020 11:04 am
Forum: *Shrodinger Equation
Topic: Midterm Scores
Replies: 30
Views: 336

Re: Midterm Scores

it might take a bit longer than expected since they found an error in a problem recently so they have to go through all the exams again Did you have a problem in your exam too? In one of my questions there wasnt a correct answer in the multiple choice... I thought I was just making a mistake until ...
by Sandra Kim 2B
Sat Oct 31, 2020 7:16 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Sapling Homework
Replies: 8
Views: 56

Re: Sapling Homework

yeah, i'm pretty sure we can just think they want the full electron configurations on sapling as a default
by Sandra Kim 2B
Fri Oct 30, 2020 6:52 pm
Forum: *Shrodinger Equation
Topic: Midterm Scores
Replies: 30
Views: 336

Re: Midterm Scores

it might take a bit longer than expected since they found an error in a problem recently so they have to go through all the exams again
by Sandra Kim 2B
Fri Oct 30, 2020 6:47 pm
Forum: Administrative Questions and Class Announcements
Topic: Curve on Midterm
Replies: 9
Views: 118

Re: Curve on Midterm

I'm also wondering if the midterms are curved :( would love it if it was
by Sandra Kim 2B
Sun Oct 25, 2020 7:33 pm
Forum: Administrative Questions and Class Announcements
Topic: midterm 1
Replies: 10
Views: 93

Re: midterm 1

Eve Gross-Sable 2B wrote:I do not think there will be very many since it's only a 50 minute period, but on a related note, does anyone know the format?

they will be one-part (as in no part a, part b, etc.) multiple-choice questions (thank [censored])
by Sandra Kim 2B
Sun Oct 25, 2020 6:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm scratch work
Replies: 8
Views: 49

Re: Midterm scratch work

We're going to be allowed to have multiple empty sheets of paper for scratch work, right? I feel like just one wouldn't suffice for me :(
by Sandra Kim 2B
Sun Oct 25, 2020 6:38 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Minimum uncertainty problems
Replies: 3
Views: 27

Re: Minimum uncertainty problems

By just using the Heisenberg Uncertainty Principle, it gives you the minimum uncertainty since the principle tells us that the atoms must be bigger than whatever you get for the answer after using the equation (since there is a physical limit to the minimum size that atoms can exist based on physica...
by Sandra Kim 2B
Sun Oct 25, 2020 6:22 pm
Forum: Photoelectric Effect
Topic: Exercise 1B9
Replies: 2
Views: 28

Exercise 1B9

I saw in the student solution manual for exercise 1B9 that they used the function: E=hcλ^-1 to find how many photons are generated. I just want to know how they got this equation to solve the problem.
by Sandra Kim 2B
Mon Oct 19, 2020 5:37 pm
Forum: Balancing Chemical Reactions
Topic: H7
Replies: 4
Views: 54

H7

This fundamentals exercise gives names of the compounds being reacted/produced (like (a) Calcium metal reacts with water to produce hydrogen gas and aqueous calcium hydroxide.). I was just wondering if we are going to be expected to know how to write it into an actual chemical equation given just th...
by Sandra Kim 2B
Sun Oct 18, 2020 8:11 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 203
Views: 1286

Re: How are you studying?

Doing all the textbook problems has been a good way to memorize the concepts and steps to solving problems :)
by Sandra Kim 2B
Sun Oct 18, 2020 6:52 pm
Forum: Empirical & Molecular Formulas
Topic: F3 Part A (Textbook)
Replies: 6
Views: 47

Re: F3 Part A (Textbook)

So we aren't expected to memorize them, right?
by Sandra Kim 2B
Sat Oct 17, 2020 11:52 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E1
Replies: 9
Views: 1235

Re: E1

Is there a reason why it was specifically converted to km in the answer key? I don't see the question asking for the answer to be in km
by Sandra Kim 2B
Sat Oct 17, 2020 6:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Question about Midterms
Replies: 9
Views: 102

Re: Question about Midterms

lol sorry for replying again but I just saw that we will probably be given the same periodic table for the exams so that everyone would use the same numbers for things like molar mass!
by Sandra Kim 2B
Sat Oct 17, 2020 5:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Question about Midterms
Replies: 9
Views: 102

Re: Question about Midterms

I'm pretty sure we aren't expected to memorize the constants and will be allowed to have sheets of both the periodic table and constants with us. But I'm sure it would be nice to memorize some of the constants that are often used.
by Sandra Kim 2B
Sat Oct 17, 2020 5:32 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: delta E
Replies: 10
Views: 61

Re: delta E

I think negative it's because delta E is the difference between two energy levels so the electron's energy has decreased as it's released as electromagnetic radiation so you are right about it being released
by Sandra Kim 2B
Sat Oct 10, 2020 12:44 pm
Forum: Molarity, Solutions, Dilutions
Topic: Stuck on Sapling HW
Replies: 14
Views: 199

Re: Stuck on Sapling HW

like the hint on the problem suggests, you need to find CuNO3 in moles, so you first have to get the molar mass of the compound and convert to moles with the molar mass and the given mass. Then, you take the formula M=n/V but isolate V. Then, you plug in everything you have to get V which is in lite...
by Sandra Kim 2B
Sat Oct 10, 2020 11:59 am
Forum: Limiting Reactant Calculations
Topic: #10 Week 1 HW
Replies: 8
Views: 92

#10 Week 1 HW

What does the variable 'd' represent in #10 of the week 1 homework?? I was assuming that it was the molar mass but I'm not too sure :/
by Sandra Kim 2B
Thu Oct 08, 2020 10:48 pm
Forum: SI Units, Unit Conversions
Topic: Acronym for prefixes
Replies: 7
Views: 86

Re: Acronym for prefixes

Thank you so much!! This is definitely gonna help me remember whenever it comes up :)
by Sandra Kim 2B
Thu Oct 08, 2020 10:41 pm
Forum: Empirical & Molecular Formulas
Topic: Issue with Sapling Drawing Practice Question 9
Replies: 1
Views: 26

Re: Issue with Sapling Drawing Practice Question 9

hey marc!
i was stuck on that problem too until I looked up what a NO3 structural model was supposed to look like, so all you gotta do is make the positioning of the positive charge identical. (or at least that's what i did)
by Sandra Kim 2B
Thu Oct 08, 2020 10:31 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molar Mass and Molecular Mass Difference?
Replies: 21
Views: 255

Molar Mass and Molecular Mass Difference?

Was just wondering what's different between molar mass and molecular mass since the process for finding both seem to be practically identical (correct me if I'm wrong please I forgot everything about chem since hs). Or is this just not something I should worry about?

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