Search found 89 matches

by keely_bales_1f
Sun Feb 21, 2021 6:28 pm
Forum: Student Social/Study Group
Topic: Winter GEs?
Replies: 22
Views: 110

Re: Winter GEs?

I really enjoyed my communications class this quarter, COMM 10. It was super interesting and pretty easy. I also enjoyed my literature class, ComLit2CW with professor Komar. It satisfies your diversity requirement and one other requirement (I think your analysis one?), but it is a lot of heavy readi...
by keely_bales_1f
Sun Feb 21, 2021 6:24 pm
Forum: Student Social/Study Group
Topic: Fave food
Replies: 93
Views: 190

Re: Fave food

Popcorn and cinnamon toast are my favorite comfort foods. They always are delicious for any occasion.
by keely_bales_1f
Sun Feb 21, 2021 6:23 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: state functions
Replies: 6
Views: 16

Re: state functions

Heat and Work are not state functions because they are dependent on the path used to go from the initial to final state. State functions by definition only depend on the state of the system, not the path used to get to that state. I hope this explanation was somewhat helpful!
by keely_bales_1f
Sun Feb 21, 2021 6:17 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: R Constant
Replies: 88
Views: 241

Re: R Constant

As students have mentioned above, the R constant you use depends on the context of the problem!
by keely_bales_1f
Sun Feb 21, 2021 6:15 pm
Forum: Student Social/Study Group
Topic: Post Midterm 2 De-stressing
Replies: 85
Views: 220

Re: Post Midterm 2 De-stressing

Yes we love Wanda Vision! I just plan on getting outside, maybe the beach because the sound of the waves crashing on the shore is so therapeutic.
by keely_bales_1f
Sun Feb 14, 2021 4:01 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 236
Views: 36146

Re: Final Jitters

I am super worried for finals this quarter because chemistry is a lot more complex this quarter (thermochemistry is the death of me!). However, power naps and watching comedic relief shows on Netflix or Hulu help relieve some anxiety.
by keely_bales_1f
Sun Feb 14, 2021 3:59 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Sapling week 5/6 question 18
Replies: 6
Views: 54

Re: Sapling week 5/6 question 18

I followed the correct steps (and the same ones I followed for part b), but keep getting a very large number for k. Any idea why this might be? I had the same problem. have you checked all the signs of your values? I realized I didn't carry a negative sign from one of the table values which gave me...
by keely_bales_1f
Sun Feb 14, 2021 3:57 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Is it necessary to memorize Cp,m or Cv,m values? [ENDORSED]
Replies: 26
Views: 109

Re: Is it necessary to memorize Cp,m or Cv,m values? [ENDORSED]

No you do not! I believe that they are on the equation sheet.
by keely_bales_1f
Sun Feb 14, 2021 3:56 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: temperature
Replies: 32
Views: 74

Re: temperature

Depending on the context of the problem you might have to convert a few things, including temperature. Just make sure you pay attention to the wording and context of a problem because it can be the difference between a right answer and a wrong answer!
by keely_bales_1f
Sun Feb 14, 2021 3:54 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Closed vs Isolated System
Replies: 28
Views: 53

Re: Closed vs Isolated System

A closed system can exchange energy with its surroundings (not matter like in an open system), whereas an isolated system cannot exchange matter with either its surroundings nor matter.

Example of Closed System: putting ice on injury
Example of Isolated System: sealed vacuum flask
by keely_bales_1f
Sun Feb 07, 2021 6:48 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8730
Views: 1488861

Re: Post All Chemistry Jokes Here

What's the difference between and optimist, a pessimist, and a chemist?

An optimist sees the glass half full, a pessimist sees the glass half empty, and the chemist sees the glass full with half liquid and half gas.
by keely_bales_1f
Sun Feb 07, 2021 6:41 pm
Forum: Calculating Work of Expansion
Topic: Sapling #18
Replies: 8
Views: 98

Re: Sapling #18

The way to solve for ΔU also depends on the molar specific heat of the gas. For q, you use the constant-pressure molar specific heat, which you are given as 4R. However, the equation for ΔU is ΔU = nCvΔT The ΔU equation requires the constant-volume molar specific heat. So how are constant-pressure ...
by keely_bales_1f
Sun Feb 07, 2021 6:31 pm
Forum: Calculating Work of Expansion
Topic: Sapling #14 for Wk 3 and 4
Replies: 12
Views: 65

Re: Sapling #14 for Wk 3 and 4

The first path is a reversible expansion so you would use w = -nRTln(V2/V1). However you first need to find moles so you would use the ideal gas law to find it (n = PV/RT). Then once you solved for moles you input it in -nRTln(V2/V1). For Path B because it is at a constant pressure, irreversible re...
by keely_bales_1f
Sun Feb 07, 2021 6:16 pm
Forum: Calculating Work of Expansion
Topic: Sapling 15
Replies: 6
Views: 51

Re: Sapling 15

Although great answers have been said above, I will reiterate what they stated. First use stoichiometry to calculate the number of moles of N2 produced. Second use the PV=nRT equation. (Your value for R in this scenario will be 0.0821, the value for your temperature must be in Kelvin...) Third, with...
by keely_bales_1f
Sun Feb 07, 2021 6:09 pm
Forum: Calculating Work of Expansion
Topic: Sapling #14
Replies: 4
Views: 30

Re: Sapling #14

As what other students mentioned above, the many different R values are used depending on the situation of the given problem. I was confused too with all the different R values!
by keely_bales_1f
Sun Jan 31, 2021 12:33 pm
Forum: Student Social/Study Group
Topic: Sapling Homework
Replies: 6
Views: 35

Re: Sapling Homework

As said above, ask questions on chemistry community! Or even in the Chem GroupMe app. Adila helps answering a lot of people's questions. Don't Gove up! You got this :)
by keely_bales_1f
Sun Jan 31, 2021 12:31 pm
Forum: Student Social/Study Group
Topic: Worried About MT 1 Grades
Replies: 39
Views: 235

Re: Worried About MT 1 Grades

Last quarter I struggled with the Lavelle's tests even after studying the best I knew how to. However, going to all the UA sessions helped a lot. As did doing the textbook questions. I too am worried about grades, but remember that we still have two more exams in this class that we can improve upon!...
by keely_bales_1f
Sun Jan 31, 2021 12:29 pm
Forum: Student Social/Study Group
Topic: How to relax
Replies: 125
Views: 690

Re: How to relax

To relax I usually listen to music!
by keely_bales_1f
Sun Jan 31, 2021 12:27 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8730
Views: 1488861

Re: Post All Chemistry Jokes Here

Gold is the best element. Why you ask?

Because it is AU-some.
by keely_bales_1f
Sun Jan 31, 2021 12:18 pm
Forum: Phase Changes & Related Calculations
Topic: Sapling Week 3/4 Q10
Replies: 3
Views: 32

Sapling Week 3/4 Q10

An ice cube with a mass of 50.0 g at 0.0 ∘C is added to a glass containing 387 g of water at 45.0 ∘C. Determine the final temperature of the system at equilibrium. The specific heat capacity of water, Cs is 4.184 J/g⋅∘C and the standard enthalpy of fusion, ΔH∘fus of water is 6.01×10^3 J/mol. Assume ...
by keely_bales_1f
Sat Jan 23, 2021 10:43 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Studying for Midterm #1
Replies: 63
Views: 179

Re: Studying for Midterm #1

Definitely put in the hours to study. I would read the sections of the textbook he assigned in the outlines, as well as the textbook problems. In addition UA session are super helpful!
by keely_bales_1f
Sat Jan 23, 2021 10:42 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework number six
Replies: 4
Views: 31

Re: Homework number six

I would definitely review materials for chem 14a if you had Lavelle, specifically strong acids and bases. This made identifying acidic, basic, and neutral so much easier! I believe a list of the strong acids and bases is on Sapling as well.
by keely_bales_1f
Sat Jan 23, 2021 10:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Tables
Replies: 32
Views: 77

Re: ICE Tables

The values of x, or rather the quantity of it, does correspond to the stoichiometric coefficients of the balanced chemical equation.
by keely_bales_1f
Sat Jan 23, 2021 10:37 pm
Forum: Student Social/Study Group
Topic: How to relax
Replies: 125
Views: 690

Re: How to relax

I took a meditating fiat lux class in the fall and it definitely helps me relax. It is nice to just sit and breathe for a minute, and not have to think about anything in particular. If you are interested in meditation I would definitely recommend taking Professor Shorter's Meditation fiat lux if he ...
by keely_bales_1f
Sat Jan 23, 2021 10:35 pm
Forum: Student Social/Study Group
Topic: Favorite TV shows
Replies: 189
Views: 1206

Re: Favorite TV shows

Criminal Minds is always good (if you're into criminology and profiling). If you're looking for something that is more upbeat and funny, I feel like New Girl and Impractical Jokers never fail to make me laugh. As for childhood shows, Big Time Rush was one of my favorites. I also really enjoyed Julie...
by keely_bales_1f
Sat Jan 16, 2021 6:09 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8730
Views: 1488861

Re: Post All Chemistry Jokes Here

What's the dullest element?

Bohrium!
by keely_bales_1f
Sat Jan 16, 2021 5:52 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pH of Weak Acids
Replies: 11
Views: 75

Re: pH of Weak Acids

Yeah I was having similar thoughts. I feel that this would be a good question to bring up to Professor Lavelle during his office hours for a clear and distant answer. (If there is a distinct answer.)
by keely_bales_1f
Sat Jan 16, 2021 5:46 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Using Kw
Replies: 5
Views: 28

Re: Using Kw

Depending on the context of the problem, Kw can be used in a multitude of ways. However, primarily it is used to find the H3O+ and the OH- concentrations. ( [H3O+][OH-]=Kw=1.0 x 10^-14 ) If you are given the pOH of the pH and need to find the other, you could used this equation: pH + pOH = 14. If yo...
by keely_bales_1f
Sat Jan 16, 2021 5:40 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle Basics
Replies: 4
Views: 49

Re: Le Chatelier's Principle Basics

In Dr. Lavelle's lectures for week 1, he covers that chemical reactions adjust to minimize the effect of changes... Le Chatelier's Principle. He also says that Le Chatelier's Priciple applies to changing physical parameters (Pressure and Temperature). I would definitely review that last section of t...
by keely_bales_1f
Sat Jan 09, 2021 5:59 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8730
Views: 1488861

Re: Post All Chemistry Jokes Here

what do you do with a sick chemist?


if you can't helium, and you can't curium, you might as well barium.
by keely_bales_1f
Sat Jan 09, 2021 5:51 pm
Forum: Ideal Gases
Topic: value of R
Replies: 24
Views: 95

Re: value of R

To know which value of R to use, make sure you read the problem that you are doing carefully. It should give you context clues as to whether you are dealing with atms, bars, etc. Then you would use the R value for the specific unit.
by keely_bales_1f
Sat Jan 09, 2021 5:49 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Change in Pressure
Replies: 9
Views: 41

Re: Change in Pressure

By increasing the pressure (only applies to gases), you would be decreasing the overall volume. This would result in an increase of concentration.
by keely_bales_1f
Sat Jan 09, 2021 5:43 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K vs. Q
Replies: 53
Views: 204

Re: K vs. Q

So if we are given Kc and then are told to calculate Q with the given concentrations of the products and reactants, Q would tell us if the reaction is at equilibrium or if the reaction leans toward the products/reactants?
by keely_bales_1f
Thu Jan 07, 2021 6:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: HW problem
Replies: 4
Views: 53

Re: HW problem

I would look at the responses written under the tab of Sapling Problem #5 (Of this section) because students have given very detailed and helpful answers there!
by keely_bales_1f
Thu Jan 07, 2021 6:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling #5
Replies: 4
Views: 48

Re: Sapling #5

When looking at this problem yesterday I had no idea how to do it. After my discussion session today where we did a similar problem, I now understand how to go about this problem. First you need to figure out which equations listed have the reactants and products you are looking for (know that you c...
by keely_bales_1f
Wed Dec 16, 2020 10:53 pm
Forum: *Titrations & Titration Calculations
Topic: Titration Curves
Replies: 2
Views: 45

Re: Titration Curves

I believe that Professor Lavelle will go into more detail about titrations in Chem 14B. But based on the last lecture in 14A, the graph he depicted was a titration curve. It showed us the volume of the titrant on the x-axis and the pH on the y-axis. This graph also tells us the stoichiometric or equ...
by keely_bales_1f
Wed Dec 16, 2020 10:48 pm
Forum: Student Social/Study Group
Topic: Existing 14B Groupme
Replies: 4
Views: 44

Re: Existing 14B Groupme

The chemistry 14A GroupMe group chat converted into a Chem 14B group chat. Let me know if you need the link to join!
by keely_bales_1f
Wed Dec 16, 2020 10:45 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 187
Views: 108889

Re: Reading the textbook [ENDORSED]

Are there a lot of topics in the book that are not covered during lecture that show up on tests? I feel that on the midterms, doing the practice problems from the textbook helped a lot. So for next quarter I recommend keeping up with textbook material as it is being taught in lectures. I feel that ...
by keely_bales_1f
Wed Dec 16, 2020 10:43 pm
Forum: Lewis Acids & Bases
Topic: Lewis vs Bronsted
Replies: 20
Views: 109

Re: Lewis vs Bronsted

As stated above, Lewis acids/bases have to deal with electrons whereas Bronsted acids/bases deal with H+ ions.
by keely_bales_1f
Wed Dec 16, 2020 10:38 pm
Forum: Student Social/Study Group
Topic: grade worries
Replies: 110
Views: 1217

Re: grade worries

Hey you guys just remember that it is many of your first quarter at UCLA with everything being virtual. Try not to stress to much!
by keely_bales_1f
Sun Dec 06, 2020 8:36 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8730
Views: 1488861

Re: Post All Chemistry Jokes Here

What do you call and acid with an attitude?



A - meano - acid :)
by keely_bales_1f
Sun Dec 06, 2020 8:33 pm
Forum: Naming
Topic: Number after Metal
Replies: 9
Views: 82

Re: Number after Metal

The Roman numeral after the metal, written in parenthesis, represents the oxidation state of that metal.
by keely_bales_1f
Sun Dec 06, 2020 8:31 pm
Forum: Bronsted Acids & Bases
Topic: Acids as proton donors
Replies: 4
Views: 31

Re: Acids as proton donors

As someone had already said above, the two definitions describe an acid, but the Bronsted definition deals with the protons and the Lewis definition deals with the electrons. I find that reading the textbook clarified these two definitions.
by keely_bales_1f
Sun Dec 06, 2020 8:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Grade
Replies: 9
Views: 134

Re: Final Grade

I am not quite sure when we will receive our final grade, but I assume it will be shortly after we take our final exam.
by keely_bales_1f
Sun Dec 06, 2020 8:28 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Sapling Week 9
Replies: 6
Views: 51

Re: Sapling Week 9

The answer is just octahedral. Octahedral is a COMMON shape for the coordination number 6. I think when I looked at the explanation for this problem it said that pentagonal pyramidal was not common.
by keely_bales_1f
Sun Nov 29, 2020 11:11 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 4
Views: 30

Re: Ligands

Yes! Ligands must have one or more lone pairs. Just a bit of extra information that Lavelle covered in his last lecture (11/26/20) that we need to know is: Ligands bind at: 1 site (donate 1 e- pair) --> Monodentate 2 sites (donate 2e- pair) --> Bidentate 3 sites (donate 3e- pair) --> Tridentate 6 si...
by keely_bales_1f
Sun Nov 29, 2020 11:04 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Number and Regions of density
Replies: 8
Views: 50

Re: Coordination Number and Regions of density

In Lavelle's last lecture (11/26/20), he said that the number of bonds was equal to the coordination number.
by keely_bales_1f
Sun Nov 29, 2020 11:01 am
Forum: Hybridization
Topic: sp and sp2
Replies: 7
Views: 69

Re: sp and sp2

I am pretty sure we don't need to know what these orbitals look like, rather we just have to know what the hybridization of a molecule will be based off the number of electron densities present on the central atom. However, I would ask this question in office hours with Lavelle to double check!
by keely_bales_1f
Sun Nov 29, 2020 10:58 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Chart
Replies: 18
Views: 106

Re: VSEPR Chart

Hi I found this really good website to study the VSEPR chart. http://intro.chem.okstate.edu/1314F00/Lecture/Chapter10/VSEPR.html Yes! This is the website the Justin recommended during his workshop and it is really helpful for visualizing the molecular shapes. He just reminded us to double check the...
by keely_bales_1f
Sun Nov 29, 2020 10:48 am
Forum: Industrial Examples
Topic: Bond rotations
Replies: 7
Views: 151

Re: Bond rotations

What exactly makes single bonds capable of rotation and double bonds unable to do so? I definitely would rewatch Lavelle's Week 7 Friday Lecture (11/20/20). He draws out sigma and pi bonds and does a demonstration with a pencil that explains why double bonds are incapable of rotating. I have attach...
by keely_bales_1f
Sun Nov 22, 2020 5:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling question
Replies: 4
Views: 27

Re: Sapling question

When I went to Justin's UA session, he said that we are not required to know the exact angle. However, we are supposed to give an approximate angle, such as less than or greater than 90 degrees.
by keely_bales_1f
Sun Nov 22, 2020 5:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling Week 7-8 #2
Replies: 3
Views: 33

Re: Sapling Week 7-8 #2

The answer would be square planar! Check out the website I linked below for more help with identifying molecular geometry!
http://intro.chem.okstate.edu/1314F00/L ... VSEPR.html
by keely_bales_1f
Sun Nov 22, 2020 5:26 pm
Forum: Student Social/Study Group
Topic: Exercising Our Minds and Bodies
Replies: 107
Views: 581

Re: Exercising Our Minds and Bodies

I usually have intermittent dance parties in my room throughout the day. I also watch youtube dance videos and try and copy the choreography, but I am not the best dancer. I try and run but finding the motivation to run can be hard.
by keely_bales_1f
Sun Nov 22, 2020 5:22 pm
Forum: Student Social/Study Group
Topic: Big Sad: Midterm 2
Replies: 86
Views: 930

Re: Big Sad: Midterm 2

Remember, if you struggled with these topics, try and go to as many step-up and UA sessions as possible. They are honestly such a HUGE help since they go over more complex examples and relate it back to the concepts Lavelle discusses in lectures. We also still have a final to take! Try not to stress...
by keely_bales_1f
Sun Nov 22, 2020 5:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving week lectures
Replies: 5
Views: 63

Re: Thanksgiving week lectures

As everyone said above, pretty sure we will still have lectures and discussion sections as scheduled up to Wednesday, but since we have Thursday and Friday off, I would say there are no discussion sections / lectures scheduled. However, I would wait and watch Monday's lecture and keep and ear open f...
by keely_bales_1f
Sun Nov 22, 2020 5:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: different shapes given in notes
Replies: 4
Views: 39

Re: different shapes given in notes

When I went to Justin's UA session, he said that we should know more shapes just to be safe, but also to help us prepare of organic chemistry. He shared a link with us during his Saturday session which allows you to see a visual of each of the shapes in the VSEPR Model. I have attached the link belo...
by keely_bales_1f
Sun Nov 15, 2020 2:05 pm
Forum: Trends in The Periodic Table
Topic: Trends on the Period Table
Replies: 8
Views: 70

Re: Trends on the Period Table

I would definitely recommend reviewing the lectures from Lavelle since he covers all the trends we should know for the upcoming midterm.
by keely_bales_1f
Sun Nov 15, 2020 2:04 pm
Forum: Trends in The Periodic Table
Topic: Atomic radius
Replies: 4
Views: 48

Re: Atomic radius

If you want more clarification for atomic radii, I would look at the period table that Lavelle had put in his lectures. I have attached the link to a similar one below... I hope this helps! https://www.google.com/url?sa=i&url=http%3A%2F%2Fcrystalmaker.com%2Fsupport%2Ftutorials%2Fatomic-radii%2Fi...
by keely_bales_1f
Sun Nov 15, 2020 1:58 pm
Forum: Student Social/Study Group
Topic: Midterm 2
Replies: 22
Views: 135

Re: Midterm 2

For the midterm I am reviewing my lecture notes, doing practice worksheets from the UA sessions, and working on textbook problems. I personally like making flash cards for each of the concepts on the outlines, to know what I have to study more.
by keely_bales_1f
Sun Nov 15, 2020 1:54 pm
Forum: Ionic & Covalent Bonds
Topic: Metals and Nonmetals in p block
Replies: 3
Views: 33

Re: Metals and Nonmetals in p block

Before the exam, you can only have a periodic table that is on Lavelle’s website. However, once the exam starts you can draw whatever you want on the period table, including trends and the line that distinguishes metals from non metals in the p-block.
by keely_bales_1f
Sun Nov 15, 2020 1:47 pm
Forum: Coordinate Covalent Bonds
Topic: Lewis Acid Identification
Replies: 3
Views: 53

Re: Lewis Acid Identification

I had a clarification question about Lewis Acids and Bases. I know that Lewis Acids accept an electron pair and a Lewis Base donates and electron pair. I also know that acids and bases combine to form a coordinate covalent bond. I was wondering if there is a trick to identifying Lewis Acids and Base...
by keely_bales_1f
Sun Nov 08, 2020 5:10 pm
Forum: Student Social/Study Group
Topic: grade worries
Replies: 110
Views: 1217

Re: grade worries

I feel like worrying about grades is common grounds for all students, especially us UCLA overachiever students. However, just do your best because that's all you can do. But if you continue to worry, it's all good. Only 4 more weeks to go!
by keely_bales_1f
Sun Nov 08, 2020 5:06 pm
Forum: Administrative Questions and Class Announcements
Topic: MIDTERM 2 Textbook Sections
Replies: 6
Views: 40

Re: MIDTERM 2 Textbook Sections

I am not sure up to exactly where in the textbook (for Midterm 2), however, completing the problems that are covering the same topics as lectures would be the safest bet. As well as following the outlines.
by keely_bales_1f
Sun Nov 08, 2020 4:57 pm
Forum: Electronegativity
Topic: periodic table
Replies: 16
Views: 129

Re: periodic table

I found this image that has a summarization of periodic table trends. I have attached the image below. Hope you find it helpful!
by keely_bales_1f
Sun Nov 08, 2020 4:50 pm
Forum: Student Social/Study Group
Topic: Midterm 2 Study Group
Replies: 25
Views: 164

Re: Midterm 2 Study Group

This is amazing! I will definitely join this group me to get as much extra help and studying in as possible.
by keely_bales_1f
Sun Nov 08, 2020 4:48 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 236
Views: 36146

Re: Final Jitters

This year I have been taking a meditation course that has been helping me with my anxiety. Just taking a few minutes out of your day to focus on your breathing has been a big help for me personally. However, if you have more final jitters regarding content, making a study guide and a study group wou...
by keely_bales_1f
Sun Nov 01, 2020 8:28 pm
Forum: Properties of Light
Topic: Sapling #10
Replies: 11
Views: 97

Re: Sapling #10

Did you convert from meters to nanometers correctly? Or did you type an error into your calculator by accident? Those are the only issues I can seem to think of.
by keely_bales_1f
Sun Nov 01, 2020 8:23 pm
Forum: Student Social/Study Group
Topic: Sappling week 2 problem #23
Replies: 1
Views: 35

Re: Sappling week 2 problem #23

To solve this problem you must first use the equation E=(hc)/lamda. Once you find the energy using this equation, convert to electron volts. (This constant value can be found on the Constants and Equations Worksheet provided by Lavelle.) Then make sure you take the difference of this value that you ...
by keely_bales_1f
Sun Nov 01, 2020 8:15 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: sapling 13
Replies: 7
Views: 67

Re: sapling 13

In Lavelle's lectures, he talked about what each of the variables represent. I believe it was his week 3 Friday Lecture. I have attached a picture that should help with this problem.
by keely_bales_1f
Sun Nov 01, 2020 8:09 pm
Forum: Properties of Electrons
Topic: Sapling Question (Bohr and Broglie Models of Electrons)
Replies: 4
Views: 63

Re: Sapling Question (Bohr and Broglie Models of Electrons)

When answering this problem, remember that the wave must interfere constructively with itself. In other terms, it must be complete wavelengths. (Whole number of wavelengths).
by keely_bales_1f
Mon Oct 26, 2020 7:40 pm
Forum: Photoelectric Effect
Topic: Sapling Week 2 HW_problem #25
Replies: 3
Views: 33

Re: Sapling Week 2 HW_problem #25

When solving this problem, the 2.4 micro meter is the wavelength. So knowing this, you can still use the E = hv equation, but you also must use the c=wavelength(frequency) equation to substitute your known variables to find the energy of the photon. You will eventually get E=h(c/wavelength). When yo...
by keely_bales_1f
Sun Oct 25, 2020 8:15 pm
Forum: *Black Body Radiation
Topic: Midterm
Replies: 14
Views: 240

Re: Midterm

How do we know what will be on the midterm please help i am freaking out. Is there a place where we can figure this out or do we just go to office hours. The syllabus has a bunch of practice problems that Lavelle recommends doing. Those questions are fair game for the midterm, so I would definitely...
by keely_bales_1f
Sun Oct 25, 2020 8:11 pm
Forum: Properties of Light
Topic: Midterm
Replies: 42
Views: 390

Re: Midterm

It's still a bit unclear about the amount of material we are able to use for the midterm; I thought I heard he was going to provide a printout sheet for the formulas, but I have not gotten an email about this. We are able to use a sheet of constants and equations that he provides to us and a period...
by keely_bales_1f
Sun Oct 25, 2020 8:03 pm
Forum: Empirical & Molecular Formulas
Topic: Periodic Table and Calculations
Replies: 20
Views: 167

Re: Periodic Table and Calculations

Are we able to use graphing calculators for the midterm? I heard some TAs are accepting them but I'm not sure if this is true for every section. I am pretty sure if you have a graphing calculator (the TI-84), it is acceptable. My TA said that because the majority of students have that calculator fr...
by keely_bales_1f
Sun Oct 25, 2020 2:32 pm
Forum: Naming
Topic: Formulas based on names
Replies: 8
Views: 144

Re: Formulas based on names

Professor Lavelle does go over a lot of high school chemistry, but he didn't go over nomenclature. He also said all necessary tools to solve a problem will be given to us on an exam. However, when doing examples in my discussion session with my TA, she says that a lot of molecular compound names sho...
by keely_bales_1f
Sun Oct 25, 2020 2:26 pm
Forum: SI Units, Unit Conversions
Topic: units to know for midterm
Replies: 11
Views: 150

Re: units to know for midterm

On the constants and equations worksheet from Professor Lavelle's chem14a website, there is something listed as "1 atm = 101.325 kPa"
Could someone please explain what this means?
by keely_bales_1f
Thu Oct 22, 2020 4:49 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: What is a nodal plane?
Replies: 4
Views: 52

What is a nodal plane?

In the lecture on Wednesday (10/21), Professor Lavelle was talking about orbitals. He mentioned that orbitals p, d, and f have a nodal plane. Could someone explain what a nodal plane is please?
by keely_bales_1f
Sun Oct 18, 2020 4:37 pm
Forum: Properties of Electrons
Topic: Wave properties of elecrons
Replies: 5
Views: 75

Re: Wave properties of elecrons

Hi! When two waves are in the same path, energy is always conserved and the end results will depend on the waves. For constructive waves, two waves will combine energies together usually because they are in phase (their crests line up), ultimately increasing the amplitude of the wave. The opposite ...
by keely_bales_1f
Sun Oct 18, 2020 4:27 pm
Forum: Photoelectric Effect
Topic: Short/high wavelength
Replies: 7
Views: 57

Re: Short/high wavelength

What is the actual reason for the fact that shorter wavelength/higher frequency light can eject electrons but longer wavelength/lower frequency light cannot? Each photon must have enough energy to eject an electron, and low frequency light has no photons with sufficient energy to f=do this. Increas...
by keely_bales_1f
Sun Oct 18, 2020 4:13 pm
Forum: Properties of Light
Topic: Balmer Series vs Lyman Series
Replies: 3
Views: 25

Re: Balmer Series vs Lyman Series

Just remember that Balmer series is in the visible region whereas the Lyman series is in the UV region. I also attached a diagram that was included in Lecture 6 that I drew out in my notes. I hope you find it helpful!
by keely_bales_1f
Sun Oct 18, 2020 4:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Exams
Replies: 12
Views: 99

Re: Exams

Also regarding exams, I wanted to confirm that constants will be given to us. This is correct right? Because I remember him saying that we didn't need to memorize constants in one of our lectures.
by keely_bales_1f
Sun Oct 18, 2020 4:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Downloading Chemistry Textbook
Replies: 1
Views: 18

Downloading Chemistry Textbook

When I went to Lavelle's office hours, he said that there was an app that we needed to install on our computer order to download the textbook onto our computers. Does anyone know what app this might have been?
by keely_bales_1f
Sun Oct 11, 2020 5:12 pm
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 133
Views: 18196

Re: All students read this sig fig post [ENDORSED]

In my discussion class, my TA said that 0.500g is only 1 significant figure. I am pretty sure it was 3 significant figures, but I just wanted to double check here. I'm certain 0.500 has 3 significant figures because trailing zeroes are taken into account because there's a decimal point. Leading zer...
by keely_bales_1f
Sun Oct 11, 2020 5:11 pm
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 133
Views: 18196

Re: All students read this sig fig post [ENDORSED]

In my discussion class, my TA said that 0.500g is only 1 significant figure. I am pretty sure it was 3 significant figures, but I just wanted to double check here. The Sig figs sheet on Lavelle's website states that trailing zeros with a decimal point are counted as significant. Take a look at that...
by keely_bales_1f
Sat Oct 10, 2020 5:17 pm
Forum: Empirical & Molecular Formulas
Topic: Sapling Hw Week 1 #10
Replies: 20
Views: 303

Re: Sapling Hw Week 1 #10

When I was doing this problem there was this equation that was shown in the feedback system.

Mass of Reactant (g) = density of reactant (g/mL) X volume reactant (mL)

Where and when did we learn this equation?
by keely_bales_1f
Sat Oct 10, 2020 4:56 pm
Forum: Limiting Reactant Calculations
Topic: Last Question on the Sapling Hw (Week 1)?
Replies: 12
Views: 165

Re: Last Question on the Sapling Hw (Week 1)?

Unless you just had chemical formulas and molar masses memorized, this was the kind of information that we had to look up in order to complete the problem. Had we been given the chemical formulas we could have been expected to find the molar mass by going through and adding each atom's individual m...
by keely_bales_1f
Sat Oct 10, 2020 4:52 pm
Forum: Molarity, Solutions, Dilutions
Topic: What does mmol stand for?
Replies: 33
Views: 356

Re: What does mmol stand for?

If you consider the prefixes for units, "m" stands for milli, which means 10^-3. So this would means that mol is a millimole. Example: I have 43mmol of Calcium Carbide. How many moles of Calcium Carbide do I have? This would be a simple conversion question, and if you know your prefixes to...
by keely_bales_1f
Sat Oct 10, 2020 2:39 pm
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 133
Views: 18196

Re: All students read this sig fig post [ENDORSED]

In my discussion class, my TA said that 0.500g is only 1 significant figure. I am pretty sure it was 3 significant figures, but I just wanted to double check here.

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