Search found 95 matches

by Julianna Shimabukuro 1D
Fri Feb 26, 2021 6:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem 14 B Final
Replies: 34
Views: 161

Re: Chem 14 B Final

Isabel Luu 1I wrote:How long do we get for the final? Is it the full three hours?


I think the final is only for an hour and a half. I believe that's what it said in the syllabus.
by Julianna Shimabukuro 1D
Fri Feb 26, 2021 6:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Grading Point Cuttoff
Replies: 2
Views: 24

Re: Grading Point Cuttoff

I'm not sure if he curves up from 92.5% to an A, but if he does you can miss 30 points. If he doesn't, you can miss 28 points for an A. For an A-, if he does curve, you can miss 42 points, and if not, you can miss 40 points. For a B+, if he curves, you can miss 54 points, and he doesn't, you can mis...
by Julianna Shimabukuro 1D
Fri Feb 26, 2021 6:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 score release
Replies: 13
Views: 146

Re: Midterm 2 score release

The average was an 85% but is there a way for us to see the actual grade distribution with the standard deviation? I know the class isn't curved I am just curious how I did compared to the rest of the class. I don't think there is a way to see the grade distribution unless the professor releases it...
by Julianna Shimabukuro 1D
Fri Feb 26, 2021 6:01 pm
Forum: Balancing Redox Reactions
Topic: Oxidizing vs Reducing
Replies: 55
Views: 126

Re: Oxidizing vs Reducing

OIL RIG is definitely the most common acronym (Oxidizing Is Losing, Reducing Is Gaining), but my TA also taught us "LEO the lion says GER" (Losing Electrons Oxidizing, Gaining Electrons Reducing).
by Julianna Shimabukuro 1D
Fri Feb 26, 2021 5:58 pm
Forum: Administrative Questions and Class Announcements
Topic: struggling
Replies: 73
Views: 271

Re: struggling

I really recommend attending step-up sessions since they go through the practice problems literally step-by-step, which I have found very useful. I also like to watch Organic Chemistry Tutor on YouTube. His explanations are clear and concise, and he goes over practice problems too.
by Julianna Shimabukuro 1D
Fri Feb 19, 2021 7:30 pm
Forum: Student Social/Study Group
Topic: Classes for next quarter?
Replies: 136
Views: 451

Re: Classes for next quarter?

I was planning on taking Chem 14C and Chem 14BL along with LS7B and Stats 13, but seeing as how to 2 of those classes filled up before I could enroll since my enrollment pass time was 11 PM, now I am enrolled in Chem 14BL and Sociology 1. I'm still planning to take LS7B though and possibly a GE as m...
by Julianna Shimabukuro 1D
Fri Feb 19, 2021 7:27 pm
Forum: Student Social/Study Group
Topic: Students Who Have a Job
Replies: 79
Views: 336

Re: Students Who Have a Job

I was recently hired for a UCLA work study position for the Asian American studies center, and I work about 10-12 hours per week. It was a bit difficult to manage at first since I was still getting used to the quarter system, but I do enjoy my job as it exposes me to different tasks and materials. W...
by Julianna Shimabukuro 1D
Fri Feb 19, 2021 7:25 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: q and w for an Isolated System
Replies: 14
Views: 43

Re: q and w for an Isolated System

∆U for isolated systems is 0 since it is insulated, and therefore, the heat and work will be 0 as heat cannot pass through. There will be no work either since there will be no change in the volume.
by Julianna Shimabukuro 1D
Fri Feb 19, 2021 7:20 pm
Forum: Calculating Work of Expansion
Topic: Work Formula
Replies: 15
Views: 46

Re: Work Formula

As others stated, it is only for gases since solids and liquids have an immeasurable amount of change in volume while gases' change in volume can be measured.
by Julianna Shimabukuro 1D
Fri Feb 19, 2021 7:19 pm
Forum: Student Social/Study Group
Topic: Post Midterm 2 De-stressing
Replies: 92
Views: 259

Re: Post Midterm 2 De-stressing

I am planning on having a nice dinner, and I took a nap to catch up on my sleep. I hope everyone treats themselves!
by Julianna Shimabukuro 1D
Sat Feb 13, 2021 10:15 pm
Forum: Student Social/Study Group
Topic: Culinary Chemistry
Replies: 72
Views: 456

Re: Culinary Chemistry

Speaking of culinary chemistry, if anyone has any recipes that can be made with ~microwave~ radiation let me know. Dorm life is a struggle. Trader Joe's has a lot of really nice and delicious frozen food. I really like their potstickers and butter chicken, but they have a lot of variety. I also rec...
by Julianna Shimabukuro 1D
Sat Feb 13, 2021 10:10 pm
Forum: Student Social/Study Group
Topic: Points needed to pass?
Replies: 64
Views: 237

Re: Points needed to pass?

As others stated, you would need 200/400 of the points or 50% to get a C- and pass the class.
by Julianna Shimabukuro 1D
Sat Feb 13, 2021 10:06 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: kB
Replies: 3
Views: 11

Re: kB

kB relates the average kinetic energy of molecules of a gas to temperature, and it equals 1.381 x 10^-23 J/K. Hope this helps!
by Julianna Shimabukuro 1D
Sat Feb 13, 2021 10:01 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: Units of W
Replies: 11
Views: 33

Re: Units of W

I looked back at my notes, and it does not have a unit assigned to it. Since it is a quantitative term as Saumya and Lakshmi stated, it won't have any units.
by Julianna Shimabukuro 1D
Sat Feb 13, 2021 9:36 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Sapling question 4
Replies: 9
Views: 27

Re: Sapling question 4

I used ∆S = nRln(V2/V1) as well. I had 1/4 as my ratio, and you put n as 1 mole since it does not state otherwise. For the R, you use 8.314 J/mol*K so that the units cancel. As for the V2/V1, you can write it either as ((1/4)/1) or as (0.25/1), whichever you find easier, and you multiple the moles, ...
by Julianna Shimabukuro 1D
Sat Feb 13, 2021 9:31 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Bozemann's constant
Replies: 4
Views: 13

Re: Bozemann's constant

I don't think there's a difference either. He typically puts the subscript to define it more, and since it's Bozemann's constant, he put a b to signify this constant and make it clearer.
by Julianna Shimabukuro 1D
Sat Feb 06, 2021 10:29 pm
Forum: Administrative Questions and Class Announcements
Topic: tips if you're struggling!
Replies: 77
Views: 415

Re: tips if you're struggling!

I found this very helpful. Thank you! Personally, I also pause the lectures many times to write down my notes thoroughly, which I agree is time consuming but very rewarding since you catch all of the explanations and understand rather than skimming through the lecture.
by Julianna Shimabukuro 1D
Thu Feb 04, 2021 1:04 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: week 3/4 sapling #10
Replies: 3
Views: 22

Re: week 3/4 sapling #10

I also am having trouble with this problem if anyone can help, particularly isolating the final to get the final temperature. Thank you in advance!
by Julianna Shimabukuro 1D
Thu Feb 04, 2021 1:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem Community Grade Error
Replies: 15
Views: 102

Re: Chem Community Grade Error

I also have the same issue where I have 20/25, but so long as we do the chemistry community by the deadlines, it will be updated by the end of the quarter if not earlier.
by Julianna Shimabukuro 1D
Thu Feb 04, 2021 1:01 pm
Forum: General Science Questions
Topic: midterm 1
Replies: 11
Views: 86

I also did terribly on this midterm, and I know how you feel. The only thing we can do is not let this define how well we'll do in the course. We can study even harder and take advantage of all the UA sessions. Also, if you or anyone else wants to form a study group since I know it can be hard to me...
by Julianna Shimabukuro 1D
Thu Feb 04, 2021 12:39 pm
Forum: Ideal Gases
Topic: Chem BL
Replies: 100
Views: 455

Re: Chem BL

I also plan on taking Chem 14BL and Chem 14C together in the spring, but since I have a late enrollment time, I might end up taking Chem 14BL over the summer like others.
by Julianna Shimabukuro 1D
Fri Jan 29, 2021 7:14 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Grades
Replies: 13
Views: 100

Re: Midterm Grades

It probably will be out by the end of next week since they have to make sure that none of the questions had any problems and everything was fair. They also have to check which will get partial credit as others said.
by Julianna Shimabukuro 1D
Fri Jan 29, 2021 7:12 pm
Forum: Ideal Gases
Topic: pv=nRT
Replies: 16
Views: 70

Re: pv=nRT

It is on the equation sheet, but it's always good to know so you don't waste time searching for it on the sheet.
by Julianna Shimabukuro 1D
Fri Jan 29, 2021 7:11 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Calculating standard enthalpy of formation clarification
Replies: 7
Views: 66

Re: Calculating standard enthalpy of formation clarification

Yes. Hess's Law adds the different ∆H together to get the ∆H of the equation you are looking for. It's like Sapling #5 where you have to manipulate the different reactions to get to the reaction at the end. However, for the standard enthalpy of formation, it finds the enthalpy of 1 mole and is the s...
by Julianna Shimabukuro 1D
Fri Jan 29, 2021 7:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Making X negligible
Replies: 34
Views: 99

Re: Making X negligible

As others stated, x is negligible if the Ka or Kb is less than 10^-4, and once you find x, if the concentration divided by the initial concentration is less than 5%.
by Julianna Shimabukuro 1D
Fri Jan 29, 2021 7:00 pm
Forum: Student Social/Study Group
Topic: Guyssssss...(midterm)
Replies: 22
Views: 185

Re: Guyssssss...(midterm)

hey guys just a reminder that if you're reading this, go treat yourself! we had our first midterm today and it wasn't the easiest, personally. so just a reminder to always keep going and never give up! and yes, it's okay to treat yourself after a very long and hard few weeks. I definitely treated m...
by Julianna Shimabukuro 1D
Fri Jan 22, 2021 10:57 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: H2O and K
Replies: 11
Views: 54

Re: H2O and K

H2O in gas form would be included in the K expression since it is in the gas form, and the change in concentration is measurable. It is not included, as others have stated, when it is in liquid or solid form since the change in concentration is constant or immeasurable.
by Julianna Shimabukuro 1D
Fri Jan 22, 2021 10:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ordering from weakest to strongest Acd/base
Replies: 11
Views: 81

Re: Ordering from weakest to strongest Acd/base

As others have stated, the strong acid has a low pKa and a high Ka value whereas a strong base has a low pKb and a high Kb value. A way to memorize this is that the pKa/pKb is lower, and the Ka/Kb is higher. The pKa/Ka is for acids with the "a," and the pKb/Kb is for the bases with the &qu...
by Julianna Shimabukuro 1D
Fri Jan 22, 2021 10:47 pm
Forum: Ideal Gases
Topic: Gas Constant Value
Replies: 43
Views: 138

Re: Gas Constant Value

The gas constant value will be on the equations sheet that we are allowed to use on the midterm and final. Although there are different R values with different units, you use the one that has the correct units necessary to cancel or that goes with the problem.
by Julianna Shimabukuro 1D
Fri Jan 22, 2021 10:45 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Concentration X
Replies: 4
Views: 19

Re: Concentration X

You can approximate if the K value is less than 10^-4, but if it is greater than 10^-4, you cannot approximate and would use the quadratic formula. Hope this helps!
by Julianna Shimabukuro 1D
Fri Jan 22, 2021 10:43 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Sapling week 2 #1
Replies: 2
Views: 36

Re: Sapling week 2 #1

First you make an ICE table. Then, you have the equation HA + H2O <--> H3O+ + A-. Under HA, it would be (0.23 M - X) since it has a negative change in concentration. For H3O+, it would be +x, and the same goes for A-. H2O is not included since its concentration does not change in a measurable amount...
by Julianna Shimabukuro 1D
Sun Jan 17, 2021 4:36 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling HW #2
Replies: 6
Views: 51

Re: Sapling HW #2

Divide the mol of SO3 by the L to get the concentration and create an ICE table with the concentrations of SO3, SO2, and O2. Put the changes in the "C" section and combine the concentrations and change in the "E" section. To find x, you do not have to use the quadratic formula as...
by Julianna Shimabukuro 1D
Sun Jan 17, 2021 4:29 am
Forum: Student Social/Study Group
Topic: Comfort Movies
Replies: 128
Views: 359

Re: Comfort Movies

I love all of the Studio Ghibli movies! My favorites are the classic My Neighbor Totoro and Spirited Away :) If you haven't seen them, I strongly suggest them.
by Julianna Shimabukuro 1D
Sun Jan 17, 2021 4:25 am
Forum: Ideal Gases
Topic: Gas constant R
Replies: 26
Views: 134

Re: Gas constant R

As others have stated, R is a gas constant (R = 8.3144598 J/mol·K ), and it will be provided on the equations sheet as it was for chemistry 14A.
by Julianna Shimabukuro 1D
Sun Jan 17, 2021 4:21 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: The Quadratic equation
Replies: 7
Views: 43

Re: The Quadratic equation

Gicelle Rubin 1E wrote:I'm also struggling on the application of the quadratic equation. I'm not sure how to use it correctly or when to use it :,)


We use the quadratic equation to find x for the ICE tables. However, as Fiona said, we can use it whenever we need to solve for x :)
by Julianna Shimabukuro 1D
Sun Jan 17, 2021 4:17 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Using Ka vs Kb
Replies: 8
Views: 63

Re: Using Ka vs Kb

As everyone else has stated, Ka is for the formation of acids and Kb is for the formation of bases. A way to memorize this is that Ka has an "a" in it for acids, and Kb has a "b" in it for bases.
by Julianna Shimabukuro 1D
Sun Jan 10, 2021 12:27 am
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Posts in 14B
Replies: 156
Views: 2404

Re: Chemistry Posts in 14B

Sorry if someone already asked this but do the points roll over to the next week? Like do we have to do 5 per week or would 4 one week and then 6 the next be okay? I think that it needs to be five posts per week. I don't believe that the points roll over! The points may not roll over right away, bu...
by Julianna Shimabukuro 1D
Sun Jan 10, 2021 12:25 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Does K refer to Kc or Kp or both?
Replies: 4
Views: 42

Re: Does K refer to Kc or Kp or both?

K is the equilibrium constant, but Kc is referring to the concentration whereas Kp is referring to the partial pressure. The problem will most likely specify which we need to find and will tell us which one it is if it's being used in the problem.
by Julianna Shimabukuro 1D
Sun Jan 10, 2021 12:23 am
Forum: Administrative Questions and Class Announcements
Topic: Sapling homework due date
Replies: 14
Views: 88

Re: Sapling homework due date

Yes. It's due on the 17th since I think he wants to allow us to transition into the chemistry mindset and give more leeway for those who are still waiting for their code to ship and arrive.
by Julianna Shimabukuro 1D
Sun Jan 10, 2021 12:21 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating Q
Replies: 8
Views: 38

Re: Calculating Q

As others have stated, Q is calculated the same as K where the concentration of the products is divided by the concentration of the reactants. If Q < K, the products are favored, whereas if Q > K, the reactants are favored.
by Julianna Shimabukuro 1D
Fri Jan 08, 2021 8:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: How to Know Solid from Example in Lecture in H2O
Replies: 3
Views: 20

How to Know Solid from Example in Lecture in H2O

Hi! I was wondering how we know that the Ca(OH)2, the solid from the example at the beginning of lecture #2, is in a liquid? How do we know that we can add H2O to both sides? Maybe I'm overthinking it, but any help would be greatly appreciated. Thank you!
by Julianna Shimabukuro 1D
Sat Dec 12, 2020 7:57 pm
Forum: Naming
Topic: Steps for Naming Coordination Compounds
Replies: 9
Views: 94

Re: Steps for Naming Coordination Compounds

Jacquelyn Challis 1H wrote:Does anyone know where in the book it goes over these steps for naming?

Hi! I believe it is section 9C in the textbook.
by Julianna Shimabukuro 1D
Sat Dec 12, 2020 7:50 pm
Forum: Properties of Light
Topic: wave properties of light
Replies: 4
Views: 50

Re: wave properties of light

In Professor Lavelle's review powerpoint, there is a question asking about the experiment that supports de Broglie's hypothesis of the wave nature of matter, which is the electron diffraction of a crystal. Is this what you're thinking of? Hope this helps, and good luck on the final!
by Julianna Shimabukuro 1D
Sat Dec 12, 2020 7:43 pm
Forum: Naming
Topic: Latin names
Replies: 10
Views: 81

Re: Latin names

Like Astha said, we only use the Latin names with anions. Good luck on the final!
by Julianna Shimabukuro 1D
Sat Dec 12, 2020 7:42 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acids (& Bases) naming conventions
Replies: 4
Views: 62

Re: Acids (& Bases) naming conventions

I agree with the others that we would not be tested on the naming of the acids since we have yet to learn how to do this and will most likely learn it in Chem14B instead if we were to learn it. Good luck on the final!
by Julianna Shimabukuro 1D
Sat Dec 12, 2020 7:40 pm
Forum: Student Social/Study Group
Topic: PUSH THROUGH!!
Replies: 29
Views: 202

Re: PUSH THROUGH!!

Good luck everyone! No matter what the outcome, be proud that you did your best and experienced your first quarter at UCLA even with everything being virtual!
by Julianna Shimabukuro 1D
Thu Dec 03, 2020 5:31 pm
Forum: Naming
Topic: Formula Order
Replies: 4
Views: 52

Re: Formula Order

I also agree that as long as the naming order is correct, the formula order shouldn't matter for the ligands. The transition metal is always first though.
by Julianna Shimabukuro 1D
Thu Dec 03, 2020 5:28 pm
Forum: Naming
Topic: Sapling 1
Replies: 3
Views: 49

Re: Sapling 1

It would be triamminetrichlorocobalt(III). The triammine is because there are three ammonia, but you write ammine instead of ammonia. The trichloro is the three chlorides, and you write chloro since it is inside the brackets. The ligands are also in alphabetical order which is why the chloro comes b...
by Julianna Shimabukuro 1D
Thu Dec 03, 2020 4:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: homework 7/8 #17
Replies: 3
Views: 30

Re: homework 7/8 #17

They will form a ring, and there will be one double bond between the carbon and the other bonds are single bonds. Then you add the two hydrogen to one carbon, the one not bonded to another carbon with a double bond and add the other two hydrogen to the other carbons, one hydrogen each carbon.
by Julianna Shimabukuro 1D
Thu Dec 03, 2020 4:38 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Tetrahedral vs Square Planar
Replies: 6
Views: 69

Re: Tetrahedral vs Square Planar

As other said, I do not think we will need to distinguish whether it is tetrahedral or square planar. This will most likely be something we learn in chem 14b since it is more complex.
by Julianna Shimabukuro 1D
Thu Dec 03, 2020 4:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Chart
Replies: 4
Views: 58

Re: VSEPR Chart

I use this photo and found it very helpful. Hope it helps! https://study.com/cimages/multimages/16 ... 738491.png
by Julianna Shimabukuro 1D
Sat Nov 28, 2020 5:15 pm
Forum: Sigma & Pi Bonds
Topic: sapling #15
Replies: 24
Views: 138

Re: sapling #15

As Elena said, a single bond has one sigma bond while a double bond has one sigma bond and one double bond. As for a triple bond, it still has one sigma bond but instead has two pi bonds. Hope this helps!
by Julianna Shimabukuro 1D
Sat Nov 28, 2020 5:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: CH2Cl2
Replies: 7
Views: 56

Re: CH2Cl2

It is polar since it is not symmetrical. It would be nonpolar if it was symmetrical and did not have lone pairs on the central atom, but since it has H2 and Cl2, it is not symmetrical.
by Julianna Shimabukuro 1D
Sat Nov 28, 2020 5:10 pm
Forum: Hybridization
Topic: sapling #11
Replies: 11
Views: 68

Re: sapling #11

Another way to look at it is to see how many atoms the element is bonded to and the lone pairs on that atom. If it is bonded to three atoms and has a lone pair, for example N in NH3, then this is considered to have 4 electron densities, so its hybridization is sp3. S only has one orbital, and p has ...
by Julianna Shimabukuro 1D
Sat Nov 28, 2020 5:01 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: pi and sigma bonds
Replies: 17
Views: 123

Re: pi and sigma bonds

As Lucy said, a single bond is one sigma bond, and a double bond is one sigma bond and one pi bond. Then, you have another pi bond but still a single sigma bond for a triple bond. Here's a link to a video I found helpful: https://www.youtube.com/watch?v=pT8nrBrTOm4
by Julianna Shimabukuro 1D
Sat Nov 28, 2020 4:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shape vs Polarity
Replies: 11
Views: 73

Re: Shape vs Polarity

How can you determine if a bond is polar or nonpolar? And from looking at the polarity of the bonds, how would you judge whether the molecule as a whole is polar or nonpolar? If the dipole moments do not cancel out, then it is polar. If they do cancel, it is nonpolar. Also, for the overall molecule...
by Julianna Shimabukuro 1D
Sat Nov 28, 2020 3:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Step Up/UA Sessions
Replies: 10
Views: 120

Re: Step Up/UA Sessions

I go to step up sessions when I can, especially when I am not confident in a certain topic, and I find them helpful since they work through the problems step by step. If you have any questions, you can also get clarification. I also think the sessions are useful as the UAs sometimes provide some tip...
by Julianna Shimabukuro 1D
Sat Nov 28, 2020 3:41 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi Bonds
Replies: 9
Views: 75

Re: Sigma and Pi Bonds

I also had trouble identifying the bonds, but I found this video very helpful! https://www.youtube.com/watch?v=pT8nrBrTOm4
by Julianna Shimabukuro 1D
Sun Nov 22, 2020 6:35 pm
Forum: Electronegativity
Topic: Periodic trend
Replies: 17
Views: 190

Re: Periodic trend

As the others stated, electronegativity increases across a group and decreases down a period. The same goes for electron affinity and ionization energy. As for atomic and ionic radius, they decrease across a group and increase down a period.
by Julianna Shimabukuro 1D
Fri Nov 20, 2020 9:21 pm
Forum: Student Social/Study Group
Topic: grade worries
Replies: 110
Views: 1247

Re: grade worries

Constance Newell wrote:does anyone know if we will be able to review over the questions in midterm 1


Yes. You can review your midterm if you ask your TA and go to their office hours. This is what my TA told my discussion, but I'm sure if you asked your TA, they would do the same.
by Julianna Shimabukuro 1D
Fri Nov 20, 2020 9:19 pm
Forum: Student Social/Study Group
Topic: Study Tips for Final Exam
Replies: 57
Views: 467

Re: Study Tips for Final Exam

I like to use the textbook problems as practice, but I tend to focus on the ones that are on topics that I struggle with or may not have fully understood. I also attend step up workshops as they work through the problems step by step. I found these to be really helpful!
by Julianna Shimabukuro 1D
Fri Nov 20, 2020 9:14 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Lewis acids and bases
Replies: 22
Views: 135

Re: Lewis acids and bases

I remember the Lewis acids with the "a" in acids and "a" in accept as well. However, if that doesn't help you, you can always determine which is a Lewis acid and base by drawing the Lewis structures to see which has a lone pair of electrons. The one that has a lone pair of electr...
by Julianna Shimabukuro 1D
Fri Nov 20, 2020 5:02 pm
Forum: Lewis Structures
Topic: Single electron in a Lewis Structure
Replies: 6
Views: 62

Re: Single electron in a Lewis Structure

Yes. If there is a single unpaired electron in a lewis structure, this is a radical as the others said.
by Julianna Shimabukuro 1D
Fri Nov 20, 2020 4:58 pm
Forum: Lewis Structures
Topic: Expanded Valence
Replies: 11
Views: 65

Re: Expanded Valence

As the others said, it is the elements in group 3 and above, so groups 3, 4, 5, and so on. Common examples of these are sulfur, phosphorus, and chlorine.
by Julianna Shimabukuro 1D
Fri Nov 13, 2020 6:36 pm
Forum: Electronegativity
Topic: Finding electronegativity values
Replies: 6
Views: 43

Re: Finding electronegativity values

Hi! As the others mentioned, you will be given the actual number/value, but you should know that electronegativity increases across across a period and decreases down a group.
by Julianna Shimabukuro 1D
Fri Nov 13, 2020 6:31 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures on Midterm
Replies: 31
Views: 164

Re: Drawing Lewis Structures on Midterm

Yes. I would advise drawing the structure with the least formal charges since this is considered the most plausible unless otherwise told. However, you should be able to identify the resonance structures if they have different placements of the double bonds and different formal charges on the struct...
by Julianna Shimabukuro 1D
Fri Nov 13, 2020 6:28 pm
Forum: Resonance Structures
Topic: Resonance Hybrid Structures
Replies: 6
Views: 33

Re: Resonance Hybrid Structures

Hi! I agree with the others that you most likely will not have to draw it out as the midterm is multiple choice like the previous midterm. However, it would be beneficial to know how to draw the resonance hybrid structures so you can easily identify it for the test.
by Julianna Shimabukuro 1D
Fri Nov 13, 2020 6:23 pm
Forum: Resonance Structures
Topic: plausible perchlorate ion
Replies: 3
Views: 50

Re: plausible perchlorate ion

Hi! I interpreted it to be asking which structure has the least formal charges. Therefore, the answer would be C and D since the other structures have more than one formal charge. The more formal charges the structure has, the less plausible the structure is.
by Julianna Shimabukuro 1D
Fri Nov 13, 2020 6:20 pm
Forum: Resonance Structures
Topic: lewis base or acid
Replies: 15
Views: 126

Re: lewis base or acid

Lewis acids can accept electrons, which tends to be if they do not have a complete octet or are exceptions where they can have expanded octets. Lewis bases donate electrons, so they have lone pair electrons.
by Julianna Shimabukuro 1D
Sun Nov 08, 2020 12:29 am
Forum: Trends in The Periodic Table
Topic: Group/Period Trends
Replies: 7
Views: 63

Re: Group/Period Trends

As the others previously stated, I also learned to prioritize the vertical trend over the horizontal trend due to the less amount of elements in a group compared to a period.
by Julianna Shimabukuro 1D
Sun Nov 08, 2020 12:24 am
Forum: Trends in The Periodic Table
Topic: Sapling Question (Radius)
Replies: 10
Views: 68

Re: Sapling Question (Radius)

As others have mentioned, cations are smaller than their parent atoms, and anions are larger. From Dr. Lavelle's lecture, he used an example where fluorine increased in size from about 100 to 180 due to anions being larger than the neutral parent atom and the addition of an electron in its outer she...
by Julianna Shimabukuro 1D
Sun Nov 08, 2020 12:16 am
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 250
Views: 36388

Re: Final Jitters

I also get testing anxiety, but try to be confident in yourself. Having self doubt will only increase the possibility of you forgetting the information or doing it wrong. Also, do something you enjoy before the test to take your mind off of it such as playing with your pets, playing a video game, or...
by Julianna Shimabukuro 1D
Sun Nov 08, 2020 12:10 am
Forum: Determining Molecular Shape (VSEPR)
Topic: n, l, mi
Replies: 8
Views: 63

Re: n, l, mi

Hi! From my understanding, n is the principle quantum number which determines the energy and size, or the shell. For example, in 3d^6, n = 3. l is the angular momentum quantum number which gives the shape of the orbital, whether it be s, p, d, or f. In the previous example, l = 2 since l = 0 is the ...
by Julianna Shimabukuro 1D
Sat Nov 07, 2020 11:47 pm
Forum: Student Social/Study Group
Topic: Studying From Home
Replies: 91
Views: 597

Re: Studying From Home

Hi! Like many others, I have found it difficult to concentrate while studying at home, but I have a desk that I sit at and close my door while I am trying to intensely focus. Otherwise, I like to sit outside on my patio while studying or opening my window to get a fresh breeze. Without fresh air, it...
by Julianna Shimabukuro 1D
Wed Oct 28, 2020 1:14 pm
Forum: Einstein Equation
Topic: Sapling #5
Replies: 7
Views: 104

Re: Sapling #5

Hello! C is the speed of light, a constant that we are given in the equations sheet. C = (3.00 x 10^8) m/s
by Julianna Shimabukuro 1D
Wed Oct 28, 2020 1:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Modules
Replies: 7
Views: 60

Re: Chemistry Modules

Hello! Someone asked this question in his office hours before, and he said that he would not continue posting modules for the future units since he is swamped with grading and ensuring that everything runs smoothly in terms of Chemistry Community, CCLE, etc. He said that instead we should take advan...
by Julianna Shimabukuro 1D
Wed Oct 28, 2020 1:07 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation question (sapling hw2 #12)
Replies: 3
Views: 50

Re: Rydberg Equation question (sapling hw2 #12)

Hello! n1 = 1 and n2 = 3 since n1 is the final energy level of the electron, and n2 is the initial energy level of the electron. Also, even if you do confuse the two, wavelength is always positive. It cannot be negative. Hope this helps!
by Julianna Shimabukuro 1D
Wed Oct 28, 2020 12:41 pm
Forum: DeBroglie Equation
Topic: When to Use De Broglie
Replies: 16
Views: 131

Re: When to Use De Broglie

As previously stated by the other commenters, you use de Broglie with electrons since electrons have a mass while photons do not use de Broglie as they have no mass. Instead, you would use e = hc/lambda for photons, which is E = hv and c = lambda(v) combined. In c = lambda(v), v is isolated to give ...
by Julianna Shimabukuro 1D
Wed Oct 28, 2020 12:27 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: preparing for midterm
Replies: 2
Views: 48

Re: preparing for midterm

Hello! I think he just wanted you to read it to get an understanding on the concept, but anything after Wednesday's lecture from last week will not be on the midterm as he stated. Good luck on the midterm!
by Julianna Shimabukuro 1D
Sun Oct 25, 2020 7:20 pm
Forum: Administrative Questions and Class Announcements
Topic: midterm 1
Replies: 10
Views: 94

Re: midterm 1

Hi! As the others said, no one knows for sure, but my TA and some of the UAs said that it would most likely be a mixture of easier conceptual questions, a few that you have to use the formulas for, and then a few that are supposed to be more difficult. Hope that helps!
by Julianna Shimabukuro 1D
Fri Oct 23, 2020 2:26 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Spin States
Replies: 4
Views: 37

Spin States

Hi! Can someone explain how we know which spin state the electron is in? When do we use ms = -1/2 vs ms = 1/2?
by Julianna Shimabukuro 1D
Tue Oct 20, 2020 11:53 am
Forum: Student Social/Study Group
Topic: discussion quiz
Replies: 2
Views: 28

Re: discussion quiz

I'm pretty sure my TA said that it would not be worth a grade, and it's instead to see if everyone's Respondus works before the midterm.
by Julianna Shimabukuro 1D
Tue Oct 20, 2020 11:07 am
Forum: Properties of Light
Topic: Tips to memorize wavelengths of the spectrum
Replies: 7
Views: 68

Re: Tips to memorize wavelengths of the spectrum

I thought he also previously stated in his lecture that we just need to know that 400-700 nm is visible light and that violet is 400 nm while red is 700 nm while the middle is yellow and green. He also said we would focus more from microwave to x-ray, but I think for right now, we just need to know ...
by Julianna Shimabukuro 1D
Tue Oct 20, 2020 10:56 am
Forum: Properties of Electrons
Topic: Wave Properties of Electrons and Diffraction Patterns
Replies: 2
Views: 22

Wave Properties of Electrons and Diffraction Patterns

Hello! In yesterday's lecture, Dr. Lavelle stated that the diffraction patterns result from the waves in phase (constructive) and out of phase (destructive), but I am confused on this concept. Is there a way to tell when they are constructive or destructive? Thank you.
by Julianna Shimabukuro 1D
Fri Oct 16, 2020 12:56 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr Frequency Condition
Replies: 2
Views: 16

Bohr Frequency Condition

Can someone explain to me the Bohr Frequency Condition? I'm still confused on what this means and how we know when it applies. Also, when would we use its equation of delta E = hv?
by Julianna Shimabukuro 1D
Fri Oct 16, 2020 12:49 am
Forum: Significant Figures
Topic: SI UNITS
Replies: 12
Views: 109

Re: SI UNITS

The amount of sig figs depends on the lowest number of sig figs in the numbers within the problem, or if you're adding the masses of elements from the periodic table, you use the lowest amount of sig figs for your answer when adding the masses together. However, I would not advise you to use sig fig...
by Julianna Shimabukuro 1D
Fri Oct 16, 2020 12:46 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Can an electron stay in its excited state? [ENDORSED]
Replies: 18
Views: 127

Re: Can an electron stay in its excited state? [ENDORSED]

No. Electrons will eventually want to go back to their ground state. This was a question asked in Dr. Lavelle's discussion on Wednesday, but they cannot stay in their excited state for a long period of time and will eventually go back down to the ground state.
by Julianna Shimabukuro 1D
Fri Oct 16, 2020 12:41 am
Forum: Administrative Questions and Class Announcements
Topic: Historical Figures in Science
Replies: 5
Views: 49

Re: Historical Figures in Science

I agree with the others. I don't think that it's absolutely necessary to memorize the historical figures, but it will make it easier to relate your previous knowledge with new knowledge if you see a familiar name. They also will most likely have a few questions regarding some important historical fi...
by Julianna Shimabukuro 1D
Fri Oct 16, 2020 12:37 am
Forum: General Science Questions
Topic: Polyatomic Ions
Replies: 6
Views: 72

Re: Polyatomic Ions

Hi! Like Natalie said above, I think Dr. Lavelle said he would give us the formulas since he wants us to understand the concept rather than just simply memorizing the numbers. However, it never hurts to know the basic ones.
by Julianna Shimabukuro 1D
Tue Oct 06, 2020 12:53 pm
Forum: Molarity, Solutions, Dilutions
Topic: Sapling HW Question 5
Replies: 10
Views: 114

Re: Sapling HW Question 5

Check your sig figs. It should be the smallest number of sig figs based on the molar masses that you used to add up. In my case, it was 2 so my answers were Na 19%, Cl 29%, and O 52% :)
by Julianna Shimabukuro 1D
Tue Oct 06, 2020 12:00 pm
Forum: Significant Figures
Topic: Sig Figs for Molar Mass
Replies: 14
Views: 117

Re: Sig Figs for Molar Mass

Depending on how many sig figs you use from the molar mass, your answer may be off by only 0.01, but typically this is allowed since it's so close to the original answer, and answers will vary depending on rounding and sig figs. I have been using the whole molar mass that they give, but I don't thin...
by Julianna Shimabukuro 1D
Tue Oct 06, 2020 11:53 am
Forum: Student Social/Study Group
Topic: Textbook Readings on Fundamental Topics
Replies: 5
Views: 63

Re: Textbook Readings on Fundamental Topics

I think only the parts of the readings that are discussed and applied to what we're working on will be used in tests since we'll need to use them to solve a problem. However, I can't give you a definitive answer about the content that we don't discuss. I think you should maybe try emailing him about...
by Julianna Shimabukuro 1D
Tue Oct 06, 2020 11:48 am
Forum: Limiting Reactant Calculations
Topic: Sapling #10 Walkthrough
Replies: 6
Views: 71

Sapling #10 Walkthrough

Does someone mind walking me through how to do #10 on Sapling? I know that you're supposed to find the mass of the reactant by multiplying the density and the volume of the reactant, but I'm confused on what to do next.
by Julianna Shimabukuro 1D
Tue Oct 06, 2020 1:00 am
Forum: Empirical & Molecular Formulas
Topic: Sapling #9 When to Use Molar Ratio
Replies: 3
Views: 55

Re: Sapling #9 When to Use Molar Ratio

Thank you, both Jenny and Zaid! That helped a lot :)
by Julianna Shimabukuro 1D
Tue Oct 06, 2020 12:03 am
Forum: Empirical & Molecular Formulas
Topic: Sapling #9 When to Use Molar Ratio
Replies: 3
Views: 55

Sapling #9 When to Use Molar Ratio

I know that you need to use the molar ratio in order to find the moles of C and H, but can someone explain when we use it? I'm confused on how to tell when you need to use it or not. Is it when you don't have the grams for one of the elements (in this case, O)? Also, what does the +/- 10 g/mol mean ...

Go to advanced search