Search found 87 matches

by Amanda Bueno-Kling
Sun Feb 28, 2021 11:04 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Sapling Week 7 and 8 #7
Replies: 11
Views: 41

Re: Sapling Week 7 and 8 #7

Thank you all. I have gotten it right now. I was wondering why the line diagram wants the chemicals in a different order than they are in in their respective reactions? Is there a convention for this?
by Amanda Bueno-Kling
Sun Feb 28, 2021 10:58 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Sapling Week 7 and 8 #7
Replies: 11
Views: 41

Sapling Week 7 and 8 #7

I am trying to figure out #7 with the diagram of the cell with an anode and cathode. I think I did the anode and cathode parts right, but the correction keeps telling me "The cathode should occupy the right‑hand position of the line diagram." I am not sure what this means or how to fix it?...
by Amanda Bueno-Kling
Sun Feb 28, 2021 10:51 pm
Forum: Balancing Redox Reactions
Topic: Sapling Week 7 and 8 #2
Replies: 4
Views: 23

Re: Sapling Week 7 and 8 #2

Joyce Pang 2H wrote:By summing, it just means to make a net equation from both. So In + Cd2 =>ln2 + cd with whichever coefficients.

Ok, so I would add what I have where I multiple both equations by the coefficients? Like this?
2In+3Cd^2+ ---> 2In^3+ 3Cd
by Amanda Bueno-Kling
Sun Feb 28, 2021 10:45 pm
Forum: Balancing Redox Reactions
Topic: Sapling Week 7 and 8 #2
Replies: 4
Views: 23

Sapling Week 7 and 8 #2

I am having a hard time figuring out this problem. This is the problem I have: Write a balanced overall reaction from these unbalanced half-reactions. In--->In^3+ Cd^2+--->Cd The guidance it gives me is: First, balance the charge of the half‑reactions by adding electrons. Electrons should always be ...
by Amanda Bueno-Kling
Mon Feb 08, 2021 12:15 am
Forum: Student Social/Study Group
Topic: Culinary Chemistry
Replies: 81
Views: 493

Re: Culinary Chemistry

This is a really cool thread! I love reading the replies. I love to cook a lot and I find that learning chemistry helps me understand more about cooking. A while ago I learned about the Maillard reaction, which I'll admit I don't entirely understand the chemistry behind, but I wondered if anyone els...
by Amanda Bueno-Kling
Mon Feb 08, 2021 12:07 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: DeltaE vs DeltaU
Replies: 13
Views: 49

DeltaE vs DeltaU

Is there any difference between Delta U and Delta E? I know the sapling mentioned they are used interchangeably, but is there any rule about when each is used or any difference when using one or the other?
by Amanda Bueno-Kling
Sun Feb 07, 2021 11:58 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Sapling Question #14
Replies: 1
Views: 12

Sapling Question #14

A sample of an ideal gas in a cylinder of volume 3.44 L at 298 K and 2.07 atmexpands to 8.29 L by two different pathways. Path A is an isothermal, reversible expansion. Calculate the work for path A. For #14, why is q not 0 for reaction A? I am not sure if it asking for the work the gas does on the ...
by Amanda Bueno-Kling
Sun Jan 31, 2021 11:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling #8
Replies: 5
Views: 16

Re: Sapling #8

For week 3&4's sapling #8, I'm confused on why I have to divide the standard enthalpy of reaction by number of moles of Carbon in the second part of the question. Can someone explain what standard enthalpy of reaction is and the solution of this problem? Thank you! Hi! The reason we have to do ...
by Amanda Bueno-Kling
Sun Jan 31, 2021 11:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Water as a Reactant
Replies: 9
Views: 36

Re: Water as a Reactant

Would we still disregard water if it was in the gas form, but still very abundant? I know we disregard it if it is a liquid.
by Amanda Bueno-Kling
Sun Jan 31, 2021 11:23 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Telling Apart Weak Bases vs Weak Acids by their Formula
Replies: 11
Views: 35

Re: Telling Apart Weak Bases vs Weak Acids by their Formula

I think the best strategy is to memorize strong acids and bases, and consider all others as weak. I'm not sure what tips there are other than: I know most acids with COOH (carboxyl group) in them are generally weak acids, like acetic acid for example.
by Amanda Bueno-Kling
Sun Jan 31, 2021 11:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: stability of products and reactants
Replies: 2
Views: 16

Re: stability of products and reactants

Generally, we use 10^-3 as a metric, I believe.
If K is smaller than 10^-3, then K is small, and reactants are favored.
If K is greater than 10^-3, then K is large, and products are favored.
by Amanda Bueno-Kling
Fri Jan 29, 2021 12:11 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Sapling Week 3/4 #7
Replies: 2
Views: 25

Sapling Week 3/4 #7

I am stuck on #7 for week 3/4. It asks: Calculate the standard enthalpy change for the reaction at 25 degrees C. MgCl2(s)+H2O(l)⟶MgO(s)+2HCl(g) I looked up the standard enthalpy of formation values in the table and plugged them into sum(products) - sum(reactants). However, I keep getting the wrong a...
by Amanda Bueno-Kling
Wed Jan 27, 2021 10:42 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Taking the Anti-Log
Replies: 37
Views: 126

Taking the Anti-Log

How do we take the anti-log to go from pKa back to Ka? Will this be important for the rest of the class?
by Amanda Bueno-Kling
Sun Jan 24, 2021 11:52 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Week 2 Sapling #5
Replies: 6
Views: 35

Re: Week 2 Sapling #5

The way I did it was to first find the pOH (14-pH), then find the concentration of the -OH by using 10^-pOH. This will act as the X in the ICE table Next, we can solve for our missing/needed value by setting up the equation Kb=[BH][OH]/[B] where be is our original base and BH is its conjugate acid,...
by Amanda Bueno-Kling
Sun Jan 24, 2021 11:41 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Temperature Given in Problems
Replies: 6
Views: 14

Re: Temperature Given in Problems

Thank you everyone! I am assuming later we will see problems where the temperature changes and thus has an effect? I just wanted to make sure I wasn't missing something at this time. I appreciate all your replies.
by Amanda Bueno-Kling
Sun Jan 24, 2021 11:39 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Week 2 Sapling #5
Replies: 6
Views: 35

Re: Week 2 Sapling #5

The way I did it was to first find the pOH (14-pH), then find the concentration of the -OH by using 10^-pOH. This will act as the X in the ICE table Next, we can solve for our missing/needed value by setting up the equation Kb=[BH][OH]/[B] where be is our original base and BH is its conjugate acid,...
by Amanda Bueno-Kling
Sun Jan 24, 2021 11:27 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Temperature Given in Problems
Replies: 6
Views: 14

Temperature Given in Problems

A lot of the problems give a temperature in them, but I don't know when we have to take it into account and when we don't. When reactions take place at the same temperature, like for example in #7 and #8 on the Week 2 Sapling the Ka and Kb take place under the same conditions, I've been told we can ...
by Amanda Bueno-Kling
Sun Jan 24, 2021 11:21 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: H2O as a Gas
Replies: 69
Views: 461

Re: H2O as a Gas

Do we ignore both aqueous and liquid and only consider it when it is a gas?
by Amanda Bueno-Kling
Sun Jan 24, 2021 11:16 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Sapling week 2 #8
Replies: 9
Views: 53

Re: Sapling week 2 #8

Hi Lexy! This personally how I went about solving this problem: 1. Since Kb is given to you in this problem and the constant for Kw is known as 1.0 x 10^-14, I solved for Ka using the equation: Ka x Kb = Kw. 2. Once you calculate the value for Ka, you should notice that it is significantly small; t...
by Amanda Bueno-Kling
Sun Jan 24, 2021 11:03 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Week 2 Sapling #5
Replies: 6
Views: 35

Week 2 Sapling #5

I am not sure how to start solving #5 on the week 2 Sapling. I am wondering if anyone can walk me through the steps? I know I need to set up an Ice table, but I'm not sure exactly the order of how I should approach the problem. The Kb for an amine is 7.624×10^−5. What percentage of the amine is prot...
by Amanda Bueno-Kling
Sun Jan 24, 2021 10:09 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Sapling Week 2 #7 and #8
Replies: 2
Views: 29

Sapling Week 2 #7 and #8

For the other questions on the Week 2 homework, I was able to figure them out, but I am not sure how to approach #7 and #8. This is what I have for #7: HClO is a weak acid (Ka=4.0×10−8) and so the salt NaClO acts as a weak base. What is the pH of a solution that is 0.065 M in NaClO at 25 °C? And thi...
by Amanda Bueno-Kling
Sun Jan 17, 2021 11:56 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: equilibrium shifts: left of right?
Replies: 13
Views: 34

Re: equilibrium shifts: left of right?

If the question gives you the initial concentration of the products and reactants, then they add more moles to the reactants and let it go to equilibrium, which way does it shift and why? It helps me to imagine the reaction like one of those old fashioned scales. When you put more on one side, the ...
by Amanda Bueno-Kling
Sun Jan 17, 2021 11:52 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc and Kp and Keq and Q
Replies: 6
Views: 39

Re: Kc and Kp and Keq and Q

The three K terms are all different ways of saying the same thing. Kp is when you are using equilibrium partial pressures. Kc is when you're using the equilibrium concentration values. Keq is just a general equilibrium constant. All of these ways of denoting K are the same thing, and calculated the ...
by Amanda Bueno-Kling
Sun Jan 17, 2021 11:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling #5
Replies: 8
Views: 67

Re: Sapling #5

Hi! I can try to help. You need to take the given equations and combine them in a way that is similar to the original, which is 2NH3(g)+3I2(g)↽⇀N2(g)+6HI(g). I used the following to do so: H2(g)+I2(g)↽⇀2HI(g) Ka=160 N2(g)+3H2(g)↽⇀2NH3(g) Kc=3.6×10^−2 However, you have to make sure to reverse the sec...
by Amanda Bueno-Kling
Sun Jan 17, 2021 11:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Week 1 #5
Replies: 8
Views: 69

Re: Sapling Week 1 #5

You multiply them, but make sure to inverse for a reaction going in reverse! Also make sure to put any exponents you need to scale the given values up. For my problem, I multiplied 27.7778 (the inverse of 3.6×10^−2) with 160^3 (the third power was to scale the 2HI in the given equations with the 6HI...
by Amanda Bueno-Kling
Sun Jan 17, 2021 11:35 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Question Week 1 #10
Replies: 7
Views: 48

Re: Sapling Question Week 1 #10

Thank you Rachel! I tried both, but when used the smaller of the two solutions, I got the correct answer for the problem. I am wondering how one can tell which solution to the quadratic equation to use? Do you always use the smaller one? Or do you just use whichever seems to make most sense?
by Amanda Bueno-Kling
Sun Jan 17, 2021 11:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Question Week 1 #10
Replies: 7
Views: 48

Sapling Question Week 1 #10

For #10, I am getting two solutions when I do the quadratic formula. I get both 5.7247997665174 and 0.23232253598261 as solutions, but I don't know which one to use to find the equilibrium concentrations. Does anyone know what we should do if we get two solutions like this?
by Amanda Bueno-Kling
Sun Jan 17, 2021 9:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Week 1 #3
Replies: 2
Views: 24

Sapling Week 1 #3

I am confused on #3 for Week 1 Sapling. I tried to do the products/reactants = Kc, but I kept getting the wrong answer and sapling showed me the following message. Does anyone know why this is the case? I am confused as to why the numerator and denominator change like this after the square root is t...
by Amanda Bueno-Kling
Sun Jan 10, 2021 10:43 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling #3
Replies: 4
Views: 37

Re: Sapling #3

I took a screenshot of the feedback Sapling gives on how to set up the equation. I think it's a helpful example of how it should look. For me it is working with the balanced reaction: H2(g) + I2(g) <=> 2HI(g) and gives the Kc expression: Kc = [HI]^2/[H2][I2] It should be Kc = [products]/[reactants] ...
by Amanda Bueno-Kling
Sun Jan 10, 2021 10:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Favoring Products or Reactants
Replies: 1
Views: 27

Favoring Products or Reactants

How rare is it for neither products or reactants to be favored? I would think it would be very rare or almost impossible in reality, since Dr. Lavelle said that the more stable structure will have lower energy and be favored, and it seems unlikely that products and reactants will have the exact same...
by Amanda Bueno-Kling
Sun Jan 10, 2021 10:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K Favors Products or Reactants
Replies: 20
Views: 101

Re: K Favors Products or Reactants

Typically, what counts as a large k value is >10^3 and what counts as a small k value is <10^-3. However, essentially I use 1 as a sort of threshold for k. Whenever k is lower than 1, the reactants are favored. Whenever k is higher than 1, the products are favored. I hope this helps! This is really...
by Amanda Bueno-Kling
Sun Jan 10, 2021 9:51 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K Favors Products or Reactants
Replies: 20
Views: 101

K Favors Products or Reactants

How can we tell if the products or reactants are favored using K? I know a large K value shows that the products are favored, but what qualifies as large or small K values?
by Amanda Bueno-Kling
Sun Jan 10, 2021 9:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Substances for Calculating K
Replies: 4
Views: 13

Substances for Calculating K

Why are liquids and solids excluded from calculations for K? My lecture notes say that it's because the molar concentration of a pure substance does not change in a reaction, but I am confused as to what this means. Could anyone explain this to help me understand?
by Amanda Bueno-Kling
Wed Dec 16, 2020 9:43 pm
Forum: Student Social/Study Group
Topic: Plans for Relaxing After Finals
Replies: 98
Views: 573

Re: Plans for Relaxing After Finals

I'm going to get enough sleep and try to take it easy. I'll also be doing some gardening, watching movies with my mom and sister, and playing online games with my friends! I hope everyone else can relax and stay healthy too.
by Amanda Bueno-Kling
Wed Dec 16, 2020 9:37 pm
Forum: Student Social/Study Group
Topic: Final grades
Replies: 8
Views: 62

Re: Final grades

I would assume so, but if you have concerns about your grade I would suggest emailing Dr. Lavelle. He would be able to explain or answer questions.
by Amanda Bueno-Kling
Wed Dec 16, 2020 9:35 pm
Forum: Student Social/Study Group
Topic: Course Evals
Replies: 18
Views: 137

Re: Course Evals

I know course evals were extended, but when do they close? I also forgot to do them, but will do them if they're still open.
by Amanda Bueno-Kling
Wed Dec 16, 2020 9:30 pm
Forum: Naming
Topic: Resources for Help With Naming
Replies: 2
Views: 12

Re: Resources for Help With Naming

Thank you so much Emma! I hope you're doing well too. I really appreciate you sharing that website, I'll definitely use it.
by Amanda Bueno-Kling
Wed Dec 16, 2020 9:29 pm
Forum: Student Social/Study Group
Topic: 14B Groupme
Replies: 12
Views: 131

Re: 14B Groupme

Thank you! I really appreciate it.
by Amanda Bueno-Kling
Wed Dec 16, 2020 9:26 pm
Forum: Student Social/Study Group
Topic: grade calculation
Replies: 12
Views: 125

Re: grade calculation

I like to use this one, as it has percentage breakdowns of the weight of each assignment. https://www.calculator.net/grade-calculator.html If this one doesn't work well for you or you prefer another one, make sure to search "final grade calculators with percentages" or something like that ...
by Amanda Bueno-Kling
Wed Dec 16, 2020 9:23 pm
Forum: Student Social/Study Group
Topic: Winter Break Study Group
Replies: 6
Views: 70

Winter Break Study Group

Does anyone want to make a groupme or study group and start reading the chapters for 14B topics over winter break together? Nothing too rigorous, because we all need a break, but just to get a head start on the concepts. We could do practice problems or share YouTube videos and study resources that ...
by Amanda Bueno-Kling
Wed Dec 16, 2020 9:20 pm
Forum: Student Social/Study Group
Topic: Preparing for 14B
Replies: 6
Views: 65

Re: Preparing for 14B

I could be mistaken, but I thought there would be some for 14B as well? I just don't think we have access to them yet.
by Amanda Bueno-Kling
Wed Dec 16, 2020 9:19 pm
Forum: Student Social/Study Group
Topic: HUGE THANK YOU to Dr. Lavelle, the UAs, TAs!
Replies: 14
Views: 322

Re: HUGE THANK YOU to Dr. Lavelle, the UAs, TAs!

Thank you all for providing lots of resources and support for students! The amount of time and work put into study sessions and worksheets by Dr. Lavelle and the TAs was amazing.
by Amanda Bueno-Kling
Wed Dec 16, 2020 9:17 pm
Forum: Student Social/Study Group
Topic: 14B Groupme
Replies: 12
Views: 131

Re: 14B Groupme

If there isn't already a 14B groupme, we should make one! It was really helpful this quarter to have others share review videos and study tips that they found useful.
by Amanda Bueno-Kling
Wed Dec 16, 2020 9:14 pm
Forum: Student Social/Study Group
Topic: grade calculation
Replies: 12
Views: 125

Re: grade calculation

There's plenty of online calculators that will allow you to put in grades and the weight of grades to estimate your final grade. Google something like "final grade calculator" or "percentage grade calculator". Use the syllabus and grade book to fill them out with the grades we ha...
by Amanda Bueno-Kling
Wed Dec 16, 2020 9:10 pm
Forum: Student Social/Study Group
Topic: Participation
Replies: 45
Views: 406

Re: Participation

I think it depends on the TA, some TAs have said that you can make-up points I believe. I would email your TA if you are unsure.
by Amanda Bueno-Kling
Wed Dec 16, 2020 9:05 pm
Forum: Student Social/Study Group
Topic: Preparing for 14B
Replies: 6
Views: 65

Re: Preparing for 14B

Once the outlines with recommended practice problems are up, my friend who took 14B previously recommended getting a head start on reading through the textbook and doing practice problems. You could probably try problems in the sections Dr. Lavelle just mentioned in the meantime.
by Amanda Bueno-Kling
Wed Dec 16, 2020 9:02 pm
Forum: Naming
Topic: Resources for Help With Naming
Replies: 2
Views: 12

Resources for Help With Naming

I had a difficult time learning to name coordination compounds. Does anyone know of resources or tips that make it easier? I saw flashcards suggested for memorizing certain parts of naming, but are there any good videos or websites to review the naming? I know it will come up again and I want to mak...
by Amanda Bueno-Kling
Sun Nov 29, 2020 11:57 pm
Forum: Student Social/Study Group
Topic: Molecule Modeling tool
Replies: 4
Views: 40

Re: Molecule Modeling tool

Thank you for this! I am a visual learner so this is a great resource.
by Amanda Bueno-Kling
Sun Nov 29, 2020 11:56 pm
Forum: Student Social/Study Group
Topic: Chemistry Among Us
Replies: 43
Views: 530

Re: Chemistry Among Us

This is such a cool idea! I think I would stick with purple but cautiously befriend green.
by Amanda Bueno-Kling
Sun Nov 29, 2020 11:55 pm
Forum: Student Social/Study Group
Topic: Final Exam Structure
Replies: 12
Views: 122

Re: Final Exam Structure

I don't think this has been announced yet. I checked the syllabus and it does not specify the content distribution of the exam, so I think we will have to wait for Dr. Lavelle to notify us.
by Amanda Bueno-Kling
Sun Nov 29, 2020 11:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Easiest Way to Memorize Shape Names
Replies: 9
Views: 90

Re: Easiest Way to Memorize Shape Names

I also find that drawing them out helps a lot. In my notes, I drew them as Dr. Lavelle showed them in lecture, since I tend to learn visually. It really helps me to draw them and practice seeing how they build up. Reviewing the lectures where Dr. Lavelle showed us the shapes with his 3D models might...
by Amanda Bueno-Kling
Sun Nov 29, 2020 11:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Cyclic Structure
Replies: 3
Views: 38

Re: Cyclic Structure

A cyclic structure is a ring structure, or one that is not linear. A molecule like Benzene would have a cyclic structure, as it forms a hexagon shape with the carbons. A cyclic structure would form a triangle, hexagon, or other shape instead of a straight line (linear structures form more straight l...
by Amanda Bueno-Kling
Sun Nov 29, 2020 11:40 pm
Forum: Hybridization
Topic: Determining the number of sigma and pi bonds
Replies: 8
Views: 57

Re: Determining the number of sigma and pi bonds

I counted one sigma bond for every bond in the molecule, since single, double, and triple bonds all have one sigma bond. Then, I counted one pi bond for every double bond, and two pi bonds for every triple bond. This gave me the right answer on that Sapling question.
by Amanda Bueno-Kling
Sun Nov 29, 2020 11:38 pm
Forum: Octet Exceptions
Topic: Which Elements have Expanded Octets
Replies: 3
Views: 35

Which Elements have Expanded Octets

How can we tell which elements have expanded octets? Is there a specific region of the periodic table that tells us this, or is it based on the number of valence electrons each element has? Do we memorize them, or is there a rule or technique to figure it out?
by Amanda Bueno-Kling
Sun Nov 29, 2020 11:37 pm
Forum: Sigma & Pi Bonds
Topic: Sigma Bond Rotation
Replies: 1
Views: 16

Sigma Bond Rotation

The lectures said that sigma bonds can rotate freely, whereas pi bonds cannot. How would this look in a molecule? If two halves of the molecule were bound by a sigma bond, could they rotate clockwise and counterclockwise from each other? I am a little unsure what this rotation would look like, and w...
by Amanda Bueno-Kling
Sun Nov 29, 2020 11:32 pm
Forum: Hybridization
Topic: Sapling Hybridization Problems
Replies: 4
Views: 39

Re: Sapling Hybridization Problems

Both bonds and lone pairs are areas of electron density. Regions of electron density = the number of hybrid orbitals. So say you have two bonds and one lone pair. That would be three regions of electron density, and you would have three hybrid orbitals. This would be one s orbital combined with two ...
by Amanda Bueno-Kling
Thu Nov 19, 2020 11:35 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs. Covalent Compounds
Replies: 7
Views: 90

Ionic vs. Covalent Compounds

Can anyone explain why NaCl is an ionic compound and HCl is a molecular compound? Can we figure this out just by looking at the periodic table?
by Amanda Bueno-Kling
Sun Nov 15, 2020 10:19 pm
Forum: Student Social/Study Group
Topic: Midterm 2 content
Replies: 20
Views: 178

Re: Midterm 2 content

I believe any equations that we need will be provided to us. The exam is probably more focused on if we know how to use an equation than if we can memorize it.
by Amanda Bueno-Kling
Sun Nov 15, 2020 9:18 pm
Forum: Resonance Structures
Topic: Sapling Resonance Structure Question
Replies: 3
Views: 21

Re: Sapling Resonance Structure Question

Thank you both! That is very helpful and I have figured it out now.
by Amanda Bueno-Kling
Sun Nov 15, 2020 9:01 pm
Forum: Resonance Structures
Topic: Sapling Resonance Structure Question
Replies: 3
Views: 21

Sapling Resonance Structure Question

For the sapling question: "Add formal charges to each resonance form of HCNO." I am stuck and am having a hard time figuring out the charges. The hint it gives when I am wrong is cut off, so I cannot see the equation it gives for figuring out formal charges. Can anyone help me figure out t...
by Amanda Bueno-Kling
Sun Nov 08, 2020 11:08 pm
Forum: SI Units, Unit Conversions
Topic: conversion factors
Replies: 8
Views: 62

Re: conversion factors

I agree with familiarizing yourself with the SI units and their conversions. These were not given on the last midterm and I had to try to remember them, so memorizing them will be very helpful.
by Amanda Bueno-Kling
Sun Nov 08, 2020 11:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 [ENDORSED]
Replies: 11
Views: 139

Re: Midterm 2 [ENDORSED]

Will Midterm 2 have the same format as Midterm, with a small number of questions each worth a large number of points? Or will the points be more broken up among more questions? I know on the last midterm, missing even one question really detracted from one's grade.
by Amanda Bueno-Kling
Sun Nov 08, 2020 11:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 1 answer key
Replies: 13
Views: 110

Re: Midterm 1 answer key

Unfortunately, no. Dr. Lavelle said he'd go over some that want of us missed, but so far I have been unable to review my answers and have heard it will stay that way due to the online format of the exam.
by Amanda Bueno-Kling
Thu Nov 05, 2020 3:21 pm
Forum: Administrative Questions and Class Announcements
Topic: Reviewing Answers for Midterm 1
Replies: 13
Views: 133

Reviewing Answers for Midterm 1

Hello,
I am wondering if it will be possible for us to view our Midterm 1 and see which questions we got correct and incorrect? Currently, all I can see is a score and not which questions were correct/incorrect, which I think would be helpful for us to learn from our mistakes.
Thank you!
by Amanda Bueno-Kling
Sun Nov 01, 2020 11:18 pm
Forum: Properties of Light
Topic: Amplitude and Intensity Relationship
Replies: 4
Views: 29

Amplitude and Intensity Relationship

Can anyone explain the relationship between the amplitude of the wave and the intensity of the light? I am curious to know why they are related the way that they are. I know increasing the amplitude should increase the intensity, but I don't know why.
by Amanda Bueno-Kling
Sun Nov 01, 2020 11:16 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm grades
Replies: 19
Views: 243

Re: Midterm grades

I believe by the end of Week 5, since some people had their midterm on Friday of Week 4.
by Amanda Bueno-Kling
Sun Nov 01, 2020 11:11 pm
Forum: SI Units, Unit Conversions
Topic: Memorizing SI Units
Replies: 14
Views: 116

Memorizing SI Units

Are we expected to memorize SI units? I have some of them memorized, but could not remember what power of 10 a picometer was on the exam. I didn't see SI units given on the exam or on the formulas sheet, so I am guessing we should memorize them? Does anyone have any tricks they use to memorize them,...
by Amanda Bueno-Kling
Sun Nov 01, 2020 11:06 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Combustion analysis rounding
Replies: 5
Views: 85

Re: Combustion analysis rounding

I usually don't round until the end if possible, but if I do round, I try to keep at least 3 or more sig figs. It's best to not round if possible, but rounding a little bit should not throw your answer off entirely, since the moles of each element are usually just one step towards the final answer, ...
by Amanda Bueno-Kling
Sun Nov 01, 2020 11:03 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Sapling #21
Replies: 4
Views: 52

Sapling #21

The question asks: How many electrons in an atom could have these sets of quantum numbers? n=2 n=5, l=3 n=7, l=2, ml=-1 How do we figure this out? I had a hard time and was wondering if anyone is able to succinctly explain the process. I tried to look up a few YouTube tutorials and websites explaini...
by Amanda Bueno-Kling
Sun Nov 01, 2020 10:55 pm
Forum: SI Units, Unit Conversions
Topic: Converting Electron Volts per Atom to Kilojoules Per Mole
Replies: 3
Views: 58

Re: Converting Electron Volts per Atom to Kilojoules Per Mole

Thank you so much! That really helps and now I figured it out.
by Amanda Bueno-Kling
Sun Nov 01, 2020 10:30 pm
Forum: SI Units, Unit Conversions
Topic: Converting Electron Volts per Atom to Kilojoules Per Mole
Replies: 3
Views: 58

Converting Electron Volts per Atom to Kilojoules Per Mole

I am trying to convert 1.029 Electron Volts per Atom to Kilojoules per Mole. I am having a hard time with this and wondered how I should be setting up the conversion? The problem says: "Calculate electron affinity in kilojoules per mole from the electron affinity in electron volts per atom by u...
by Amanda Bueno-Kling
Sun Oct 25, 2020 9:35 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Equations Coefficient Question
Replies: 15
Views: 114

Balancing Equations Coefficient Question

Sometimes when I am balancing chemical equations, I end up with coefficients that are not whole numbers. For example, there are 15 mols of O on one side, and on the other side I have to add a coefficient before O2. I can't put 7.5, even though 7.5 * 2 = 15, because I know coefficients have to be who...
by Amanda Bueno-Kling
Sun Oct 25, 2020 9:28 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity Question
Replies: 3
Views: 55

Molarity Question

Hi, I had a question about the molarity of a solution. Am I correct in assuming that the molarity of a solution is the same in the whole sample as it would be in a small fraction of the sample? For example, if I had 100 mL of 0.04 Molarity solution, and I took 20 mL out, would the 20 mL still have t...
by Amanda Bueno-Kling
Sun Oct 25, 2020 9:23 pm
Forum: Properties of Light
Topic: How does an atom continuously emit light?
Replies: 4
Views: 87

Re: How does an atom continuously emit light?

The way vision works, when you see a certain color, you are seeing what is not being absorbed by the object you are looking at. If I look at a leaf and it is green, it's because the molecules of the leaf absorb all wavelengths of light except green. The green light that bounces off the leaf due to n...
by Amanda Bueno-Kling
Sun Oct 25, 2020 9:15 pm
Forum: Photoelectric Effect
Topic: Conceptual understanding of the photoelectric experiment
Replies: 5
Views: 57

Re: Conceptual understanding of the photoelectric experiment

Do we need to know the details about the experiment needing to take place in a vacuum, how the detector works, or why a metal must be used? I am much clearer on the other concepts you mentioned, but am not as knowledgeable about the specifics of the experimental design.
by Amanda Bueno-Kling
Sun Oct 25, 2020 9:12 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Decreasing Energy of Electron
Replies: 1
Views: 11

Decreasing Energy of Electron

As electrons move down from a higher energy level to a lower one, they are "losing energy", as they emit photons while moving down through orbitals towards the ground state. Since the electron has an energy of zero at the reference point, how is it possible for them to move down and lose e...
by Amanda Bueno-Kling
Sun Oct 18, 2020 10:11 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Preference on Scientific Notation
Replies: 13
Views: 169

Re: Preference on Scientific Notation

I think both are able to be understood, but I see the E notation less commonly. I'd suggest using the ^ notation, as that is what I see most often. However, you can look at the problems in the exam and see which notation they use and use that for your answer.
by Amanda Bueno-Kling
Sun Oct 18, 2020 10:07 pm
Forum: General Science Questions
Topic: Writing Formulas
Replies: 10
Views: 80

Re: Writing Formulas

Usually the problem will list the formula, at least from what I have seen so far and what I encountered in high school chem. I believe we would be notified if we had to memorize nomenclature for the exam, so my assumption is that the problems will give the formula and we will not have to figure it o...
by Amanda Bueno-Kling
Sun Oct 18, 2020 10:02 pm
Forum: General Science Questions
Topic: Sig Figs
Replies: 14
Views: 100

Re: Sig Figs

I agree, it's best to use the number of sig figs used in the problem, and wait to round until you are done. I was taught in high school to default to three sig figs otherwise. However, if there are different numbers of sig figs in each number in the problem, use the lowest number of sig figs.
by Amanda Bueno-Kling
Sun Oct 18, 2020 9:57 pm
Forum: Student Social/Study Group
Topic: Respondus Tutorial
Replies: 1
Views: 10

Respondus Tutorial

Hello, I am still confused on how to get on zoom and Respondus at the same time. I do not have an external webcam. When I tried, Respondus would not let me open Zoom while in Respondus. I could only access the exam in Respondus but was unable to also run the Zoom simultaneously. Would it be possible...
by Amanda Bueno-Kling
Sun Oct 18, 2020 9:45 pm
Forum: Student Social/Study Group
Topic: studying for exams
Replies: 21
Views: 350

Re: studying for exams

A study group is a great idea and I would be interested in joining! I am going to study by practicing textbook problems and reviewing homework and my notes. Doing problems is the best way to study. My roommate who took this class last year suggested that practice problems, especially the ones given ...
by Amanda Bueno-Kling
Sun Oct 18, 2020 9:43 pm
Forum: Electronegativity
Topic: periodic table
Replies: 16
Views: 133

Re: periodic table

I find a visual to be very helpful for me when studying trends. Images like this one help me to visualize the concept and remember it. In high school chemistry, I found it useful to draw out the trends a few times to really get them down. https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.pin...
by Amanda Bueno-Kling
Sat Oct 10, 2020 8:12 pm
Forum: Student Social/Study Group
Topic: Forming Virtual Study Group
Replies: 31
Views: 202

Re: Forming Virtual Study Group

I would also be interested in joining! Perhaps we can make a GroupMe and set up weekly zoom meetings? Also, a really good idea someone in one of my other classes had was to record study sessions if everyone is ok with it. That way, we can refer to them later and anyone who has a time conflict can wa...
by Amanda Bueno-Kling
Sat Oct 10, 2020 8:05 pm
Forum: Electronegativity
Topic: Periodic Table Trend
Replies: 37
Views: 402

Re: Periodic Table Trend

When we learned about periodic table trends in high school chemistry, my teacher had us draw arrows to represent the trends in our notes. If you're a visual learner, it can be very helpful! Here's an example of this. I find it useful to refer to. https://www.google.com/url?sa=i&url=https%3A%2F%2...
by Amanda Bueno-Kling
Sat Oct 10, 2020 7:50 pm
Forum: General Science Questions
Topic: Textbook
Replies: 9
Views: 175

Re: Textbook

I second the suggestions to use Chrome! I've noticed that most issues I have with Macmillan products (Launchpad, Sapling) can be solved by switching to Chrome. In fact, I once emailed Macmillan about an issue and their solution was "switch to Chrome". If it still won't open there, I would ...
by Amanda Bueno-Kling
Sat Oct 10, 2020 7:04 pm
Forum: SI Units, Unit Conversions
Topic: Do I need to do very single textbook question on the syllabus?
Replies: 34
Views: 300

Re: Do I need to do very single textbook question on the syllabus?

As far as I understand, you don't have to do any of them, they're just recommended for your benefit. My roommate, who took 14A last academic year, said that she found them really helpful in reviewing concepts from high school and preparing for exams. If you have the time to work through some or all ...
by Amanda Bueno-Kling
Sat Oct 10, 2020 7:02 pm
Forum: SI Units, Unit Conversions
Topic: #10 in the sapling
Replies: 6
Views: 90

Re: #10 in the sapling

Are there any resources that are good for reviewing these structures and how to figure out which atoms they contain? I really struggled with this problem as I did not know how to figure out what the diagrams meant.

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