Search found 77 matches

by Brianna Martilla 1C
Sun Jan 24, 2021 11:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 1 Zoom
Replies: 8
Views: 29

Re: Midterm 1 Zoom

Also, do you think we will all be on one large zoom, or further separated like last quarter in our discussion groups?
by Brianna Martilla 1C
Sun Jan 24, 2021 11:02 pm
Forum: Student Social/Study Group
Topic: Favorite Music
Replies: 48
Views: 106

Re: Favorite Music

I mostly listen to alternative or indie rock music, but recently I have enjoyed punk rock or 2000's pop-rock. If anyone has suggestions I'd love to hear them.
by Brianna Martilla 1C
Sun Jan 24, 2021 10:58 pm
Forum: Ideal Gases
Topic: Acids and Bases
Replies: 4
Views: 13

Re: Acids and Bases

Do you mean on the midterm? If so, there is a section on acid and base equilibria, and the corresponding textbook questions are in the syllabus.
by Brianna Martilla 1C
Sun Jan 24, 2021 10:57 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When to use ICE box
Replies: 23
Views: 53

Re: When to use ICE box

You use the ICE box when being asked to find the equilibrium concentration. I think a good way to approach a problem is to see what you are given and what you already know or can determine, and then see what would apply to solve the question.
by Brianna Martilla 1C
Sat Jan 23, 2021 7:02 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8544
Views: 1474104

Re: Post All Chemistry Jokes Here

Man: Is it a crime to throw sodium chloride in your enemy's eyes?

Judge: Yes, that's assault.

Man: I know it's a salt, but is it a crime?
by Brianna Martilla 1C
Sat Jan 23, 2021 6:55 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Tables
Replies: 31
Views: 65

Re: ICE Tables

It only has to do with the coefficients.
by Brianna Martilla 1C
Sat Jan 16, 2021 9:43 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling #5
Replies: 5
Views: 53

Re: Sapling #5

Thank you everyone for the discussion on this problem! It helped me a lot. Are there any problems like this in the textbook we can practice?
by Brianna Martilla 1C
Sat Jan 16, 2021 9:25 pm
Forum: Student Social/Study Group
Topic: Comfort Movies
Replies: 126
Views: 280

Re: Comfort Movies

I love the nostalgia of watching Jurassic Park! However I mostly watch YouTube or shows on Netflix like New Girl.
by Brianna Martilla 1C
Sat Jan 16, 2021 9:23 pm
Forum: Calculating the pH of Salt Solutions
Topic: Textbook Problem 6D.13
Replies: 2
Views: 13

Re: Textbook Problem 6D.13

Make sure you calculated the pH, not pOH.
by Brianna Martilla 1C
Sat Jan 16, 2021 9:17 pm
Forum: Student Social/Study Group
Topic: New Joke Chain
Replies: 33
Views: 102

Re: New Joke Chain

What do you call an acid with an attitude?

A-mean-oh acid
by Brianna Martilla 1C
Wed Jan 13, 2021 7:49 pm
Forum: Administrative Questions and Class Announcements
Topic: What units will be in Midterm 1?
Replies: 6
Views: 36

Re: What units will be in Midterm 1?

I'm guessing we will have time to get to unit 3, and I'm also guessing our TAs will send an email about it too.
by Brianna Martilla 1C
Wed Jan 13, 2021 7:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling #9
Replies: 3
Views: 35

Re: Sapling #9

Also remember to pay attention to the coefficients and use the right amount of significant figures.
by Brianna Martilla 1C
Wed Jan 13, 2021 7:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pH and pOH conceptually
Replies: 3
Views: 17

Re: pH and pOH conceptually

Yes and yes, I believe. Water is necessary for the H3O+ and OH- to form, but water is not included when solving the equation because it is in large excess.
by Brianna Martilla 1C
Sun Jan 10, 2021 3:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling #4
Replies: 4
Views: 37

Re: Sapling #4

I had different initial values, but that answer sounds too high. If I recall it is asking for the total pressure, so you plug your x value into the equilibrium row of the ice table, and add all three values together. (My answer was 0.0910 bars for reference.)
by Brianna Martilla 1C
Sun Jan 10, 2021 3:18 pm
Forum: Ideal Gases
Topic: Advice on how to navigate Chem Community
Replies: 17
Views: 74

Re: Advice on how to navigate Chem Community

Good question! I normally use the Active topics link under Quick links in the upper lefthand corner to read and respond to more recent posts. To post a question, you create a post and put it within a category. To see how many posts you have per week, you go to Your posts under Quick links, and I cha...
by Brianna Martilla 1C
Fri Jan 08, 2021 8:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Question #2 Sapling
Replies: 2
Views: 24

Re: Question #2 Sapling

You will need to set up an ice table. For initial SO3, find concentration by doing moles divided by liters, which were given. The .120 moles O2 at equilibrium is in the O2 column and row 'E'. Use the exponents to fill in the 'C' row with x's. Now you can solve for x given the O2 value. Figure out th...
by Brianna Martilla 1C
Thu Jan 07, 2021 7:41 pm
Forum: Ideal Gases
Topic: Bars to atm [ENDORSED]
Replies: 35
Views: 173

Re: Bars to atm [ENDORSED]

My TA said that we will be approximating 1 bar = 1 atmosphere because they are similar enough when converting between them.
by Brianna Martilla 1C
Thu Jan 07, 2021 7:38 pm
Forum: Administrative Questions and Class Announcements
Topic: Sapling Assignments
Replies: 26
Views: 138

Re: Sapling Assignments

Those additional ones are optional but were helpful to me when I didn't know how to draw molecules, so they can help prepare you for future assigned Sapling problems.
by Brianna Martilla 1C
Thu Jan 07, 2021 1:53 pm
Forum: Student Social/Study Group
Topic: Learning Sessions
Replies: 24
Views: 121

Re: Learning Sessions

I suggest at least a few times per week, but more if you have time. I guess it just depends on if they work for you too. If you can learn independently, then great. But it's helpful to have an experienced student and others to work with. And before midterms and the final is especially helpful. Also,...
by Brianna Martilla 1C
Tue Jan 05, 2021 10:33 am
Forum: Student Social/Study Group
Topic: Advice for someone who didn't take 14A with professor Lavelle
Replies: 61
Views: 259

Re: Advice for someone who didn't take 14A with professor Lavelle

There a lot of resources available for extra help. UA sessions are where you can be given practice problems, whereas office hours are where you would ask for specific problem help. Of course, make sure you are doing the sapling, chemistry community, and textbook problems. To get used to the general ...
by Brianna Martilla 1C
Sun Dec 13, 2020 9:44 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Textbook Question 6B.3
Replies: 2
Views: 11

Re: Textbook Question 6B.3

pH is determined by -log([H+]), so for part a you just plug in the .025 M for H+ concentration. For part b you take into account the wrong volume flask. You take the -log of 200/250 times the concentration (.025 M). The actual pH should be slightly less acidic.
by Brianna Martilla 1C
Sat Dec 12, 2020 10:35 am
Forum: Student Social/Study Group
Topic: Plans for Relaxing After Finals
Replies: 98
Views: 457

Re: Plans for Relaxing After Finals

I love reading all your responses; they gave me some ideas on what to do. I plan on painting and drawing because it was hard to make time for that during school. Anyone have movie recommendations from Hulu or Netflix?
by Brianna Martilla 1C
Sat Dec 12, 2020 10:32 am
Forum: Student Social/Study Group
Topic: Winter Break
Replies: 44
Views: 254

Re: Winter Break

I think I'm going to make flashcards on the main terms and topics because writing them down helps me retain things better. I feel like that requires the least brainpower during a break, because I don't think I will have the motivation to do practice problems.
by Brianna Martilla 1C
Thu Dec 10, 2020 8:04 pm
Forum: Identifying Acidic & Basic Salts
Topic: Sapling HW 10 Question 11
Replies: 6
Views: 50

Re: Sapling HW 10 Question 11

Based on periodic table trends, an acid is weaker when their bond to H is stronger, because it is harder to give up an H+.
by Brianna Martilla 1C
Thu Dec 10, 2020 8:01 pm
Forum: Bronsted Acids & Bases
Topic: Sapling HW Week 10 #1
Replies: 3
Views: 35

Re: Sapling HW Week 10 #1

Vivian that is a great suggestion! Yeah I think you have to memorize the strong acids and bases, and the rest will all be weak.
by Brianna Martilla 1C
Sun Dec 06, 2020 6:56 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Sigma and Pi bond rotation
Replies: 4
Views: 43

Re: Sigma and Pi bond rotation

Yes I think so because I remember him saying that the pi bonds don't allow rotation because it connects at the two ends, and rotation would break the bond, so for any double or triple bonds that would happen.
by Brianna Martilla 1C
Sun Dec 06, 2020 6:54 pm
Forum: Student Social/Study Group
Topic: Point distribution
Replies: 11
Views: 103

Re: Point distribution

Do not let earning a grade lower than an A discourage you! These tests do not define how much you have learned or are capable of! :) I totally agree! It's too late for me to get an A now considering my past exams, but I've accepted it. I'm still working hard to get a B, even though I wanted to just...
by Brianna Martilla 1C
Sun Dec 06, 2020 6:50 pm
Forum: Student Social/Study Group
Topic: How are you?
Replies: 117
Views: 777

Re: How are you?

Surprisingly okay. Just focusing on studying for finals and staying optimistic for the time I can finally go to campus.
by Brianna Martilla 1C
Sun Nov 29, 2020 9:50 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 120 degree bond angles
Replies: 3
Views: 23

Re: 120 degree bond angles

I found this table to be really useful for studying shapes and angles. https://8dd969e7-a-ff053077-s-sites.googlegroups.com/a/coe.edu/principles-of-structural-chemistry/chemistry-and-climate-change/molecular-shapes/CD%20Spectrum.png?attachauth=ANoY7crF6LZuLn5XS4eaA7LRqj1A37qe5pqikDjjrIUlsarDWzmRkpKP...
by Brianna Martilla 1C
Sun Nov 29, 2020 9:46 am
Forum: General Science Questions
Topic: Electron Affinity
Replies: 4
Views: 36

Re: Electron Affinity

Electron affinity is the change in energy when an electron is added and defines how likely that atom is to gain an electron, so the noble gases have full valence shells and don't want any more electrons so they have an affinity of 0. It is true that they can gain electrons in the same shell, but I t...
by Brianna Martilla 1C
Sun Nov 29, 2020 9:38 am
Forum: Hybridization
Topic: Confusion on certain carbon hybridizations
Replies: 5
Views: 39

Re: Confusion on certain carbon hybridizations

Each carbon atom would be sp2 because there are three regions of electron density (the two single bonds and the one double bond). You have to count that double bond for the other carbon too. Having a visual makes it much easier to see the regions of electron density for any atom. And this works for ...
by Brianna Martilla 1C
Sun Nov 29, 2020 9:35 am
Forum: Student Social/Study Group
Topic: How to study for class
Replies: 30
Views: 177

Re: How to study for class

Hello, I only use the textbook for practice problems, but those are very helpful. To help understand concepts, I like to watch Youtube videos to hear other people teaching me. I really like The Organic Chemistry Tutor, Professor Dave Explains, and CrashCourse.
by Brianna Martilla 1C
Sun Nov 22, 2020 1:08 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: London Dispersion
Replies: 33
Views: 163

Re: London Dispersion

Yes, london dispersion forces are always present, but are very weak until they add up when many molecules are present.
by Brianna Martilla 1C
Sun Nov 22, 2020 1:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape Polarity
Replies: 3
Views: 29

Re: Molecular Shape Polarity

The same shape molecule can be polar or nonpolar, so a certain shape is not always one or the other.

Table of molecular shapes being polar or nonpolar:

[url]
https://www.pinterest.com/pin/215117319680930383/[/url]
by Brianna Martilla 1C
Sun Nov 22, 2020 1:01 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Visualizing VSEPR Shapes
Replies: 5
Views: 36

Re: Visualizing VSEPR Shapes

I would practice drawing them the geometric way with the bolded wedge and dashed wedge, instead of just lines, so that you can keep visualizing each molecule.
by Brianna Martilla 1C
Fri Nov 20, 2020 7:54 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle
Replies: 9
Views: 61

Re: Bond Angle

Yes, I think all molecular shape bond angles can differ slightly from what is expected based on what atoms are in it. For example, SF4 has a see-saw geometry but has bond angles of 173 degrees and 102 degrees.
by Brianna Martilla 1C
Fri Nov 20, 2020 2:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR notation
Replies: 9
Views: 32

Re: VSEPR notation

I think it can give us a general idea of the shape, but is not always quantitatively accurate, because if the surrounding atoms are not all the same, the bond angles will differ slightly than 'expected'.
by Brianna Martilla 1C
Mon Nov 16, 2020 7:22 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Problem 2A.17
Replies: 2
Views: 23

Re: Problem 2A.17

Well remember a full valence shell would be 8, so the answer is going to be 8 or less. The way I thought of it was the 3d^3 is the description of the last electrons of the electron configuration, so there must be 3 valence electrons. Another way to think of it is that Mn would normally have 7 valenc...
by Brianna Martilla 1C
Sun Nov 15, 2020 8:11 pm
Forum: Ionic & Covalent Bonds
Topic: D orbitals
Replies: 3
Views: 29

Re: D orbitals

The ground state electron configuration of Ag is [Kr] 5s^{2}4d^{9} , however its actual configuration based on experimentation is [Kr] 5s^{1}4d^{10} so Ag(+1) would be [Kr] 4d^{10} because you take away one electron to make it a positive charge, which you take away from the s subshell because it is ...
by Brianna Martilla 1C
Fri Nov 13, 2020 11:18 am
Forum: Dipole Moments
Topic: Boiling point of molecules
Replies: 5
Views: 30

Re: Boiling point of molecules

The way I think of it is that the stronger the intermolecular bonds, the more energy is required to break those bonds. Heat is a form of energy that will break those bonds and cause it to change states (liquid to gas phase change). This is why hydrogen bonds between water are so important, because i...
by Brianna Martilla 1C
Mon Nov 09, 2020 8:57 pm
Forum: Student Social/Study Group
Topic: Mid-quarter Check in
Replies: 67
Views: 283

Re: Mid-quarter Check in

Hey! I'm honestly really struggling, especially with this class. I only took the basic high school chemistry and took calculus instead of physics, so I find this content very confusing and difficult. I have never struggled with a class like this and I feel like it's even worse through online. I fee...
by Brianna Martilla 1C
Mon Nov 09, 2020 8:52 pm
Forum: Student Social/Study Group
Topic: Step-Up vs. Drop-In Sessions
Replies: 7
Views: 63

Re: Step-Up vs. Drop-In Sessions

I like step-up sessions because they have prepared problems from the topic you are currently on. Drop-in is more for if you have a specific question like a textbook problem you wanted help on. Each has its advantages depending on what you need.
by Brianna Martilla 1C
Mon Nov 09, 2020 8:50 pm
Forum: Bond Lengths & Energies
Topic: Electron Pairs Interacting
Replies: 3
Views: 26

Re: Electron Pairs Interacting

Because electrons all have a negative charge, they will repel each other. This is also why positively charged protons attract electrons.
by Brianna Martilla 1C
Sun Nov 08, 2020 9:46 pm
Forum: Student Social/Study Group
Topic: Studying From Home
Replies: 91
Views: 496

Re: Studying From Home

I also find it hard to study because of distractions at home, such as my family members, noise, my phone, etc. I try to isolate myself from distractions as best as possible and PLAN what I am going to do and by when. Making a plan is like creating short term goals for the day, and will motivate you ...
by Brianna Martilla 1C
Fri Nov 06, 2020 9:41 pm
Forum: Student Social/Study Group
Topic: Making it through Midterm Results
Replies: 13
Views: 141

Making it through Midterm Results

So I'll admit I did not do very well on the midterm. I missed some conceptual problems and also made errors in my calculations that led to wrong answers. Congrats to everyone who did do well though! If you also didn't do well, how do you motivate yourself or make yourself feel better? If you did do ...
by Brianna Martilla 1C
Fri Nov 06, 2020 9:31 pm
Forum: Lewis Structures
Topic: Lecture #16 Question
Replies: 2
Views: 26

Re: Lecture #16 Question

Silver halides are just an exception to the rules about covalent bonds, that you couldn't figure out on your own without experimentation. So you are correct if you refer to other bonds and their characteristics.
by Brianna Martilla 1C
Thu Nov 05, 2020 10:01 pm
Forum: Lewis Structures
Topic: How to assign formal charge
Replies: 3
Views: 24

Re: How to assign formal charge

For finding formal charge in general, I found this video really helpful. It has multiple examples and is easy to understand.

https://youtu.be/C2l-76VP8s0
by Brianna Martilla 1C
Wed Nov 04, 2020 4:59 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbital vs Subshell
Replies: 7
Views: 76

Re: Orbital vs Subshell

The orbital is the magnetic quantum number ( m_{l} ) whereas the subshell is the angular momentum quantum number (l). Orbital is given in terms from -l...0...l, and describes the pathway of an electron in a certain shell, while subshell is the l value, and is a math function that describes the wave-...
by Brianna Martilla 1C
Tue Nov 03, 2020 7:11 pm
Forum: Quantum Numbers and The H-Atom
Topic: Are there subshells past f?
Replies: 28
Views: 166

Re: Are there subshells past f?

I recall Professor Lavelle saying that there are also g, h, i (and so on) subshells, but we won't need to worry about that, especially in this class.
by Brianna Martilla 1C
Tue Nov 03, 2020 7:08 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: valence electrons in d block
Replies: 3
Views: 30

Re: valence electrons in d block

Remember that when you start writing the electron configurations for d-block metals that the d-block goes before the s-block. So d-block metals will usually have 2 valence electrons because of this. There are some exceptions where there is only 1 valence electron, for example, copper, which is why i...
by Brianna Martilla 1C
Tue Nov 03, 2020 7:01 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Formation of Ions
Replies: 5
Views: 49

Re: Formation of Ions

Yes, you are correct. You fill up the 4s orbital first because it has lower energy and orbitals are filled from lowest to highest energy. Once the d orbital is full, it has more energy now and 4s is no longer the lowest energy, so 3d electrons must be removed first. Essentially 4s is only lower when...
by Brianna Martilla 1C
Mon Nov 02, 2020 7:36 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Lecture Concept Question
Replies: 4
Views: 35

Re: Lecture Concept Question

Orbitals are like a math function because it is like a prediction and description for its location in relation to the nucleus. I think of it as a coordinate system where the nucleus is the origin. He doesn't want us to think of it like hotel rooms because the three quantum numbers are not the litera...
by Brianna Martilla 1C
Sun Nov 01, 2020 9:53 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Ground State Electron Configuration
Replies: 4
Views: 47

Re: Ground State Electron Configuration

You can tell it is excited if the electron configuration has a section that is not 'full'. For example, if you were given 1s^{2}2s^{2}2p^{6}3s^{1}3p^{2} , you may realize that the 3s^{1} is not full, and should be 3s^{2} if it were in its ground state, yet the electron configuration keeps going. Thi...
by Brianna Martilla 1C
Sun Nov 01, 2020 9:39 am
Forum: Student Social/Study Group
Topic: Favorite TV shows
Replies: 178
Views: 882

Re: Favorite TV shows

I loved Gravity Falls as a kid and still do now. Some great shows I've watched recently are New Girl, Sherlock, and Bojack Horseman. I also plan on watching Brooklyn 99.
by Brianna Martilla 1C
Wed Oct 28, 2020 8:17 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect post module
Replies: 4
Views: 61

Re: Photoelectric Effect post module

This looks like the same example Professor Lavelle did in his lecture on October 14. You rearrange E=hv and c=lambda*v to get lambda=(hc)/E. E is given and h and c are constants.
by Brianna Martilla 1C
Wed Oct 28, 2020 8:06 pm
Forum: Properties of Electrons
Topic: Sapling hw #13
Replies: 3
Views: 86

Re: Sapling hw #13

I was also having trouble with this problem but I figured it out. After rearranging the de Broglie equation and E=1/2mv^2, you should get to solve for the energy of the electron.
by Brianna Martilla 1C
Wed Oct 28, 2020 6:07 pm
Forum: DeBroglie Equation
Topic: sapling hw problem
Replies: 5
Views: 113

sapling hw problem

The E. coli bacterium is about 1.9 μm long. Suppose you want to study it using photons of that wavelength or electrons having that de Broglie wavelength. What is the energy of the electron? I figured out the answer to the first part of the problem, but I'm having trouble with this part. The feedback...
by Brianna Martilla 1C
Sat Oct 24, 2020 12:47 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1B.25
Replies: 3
Views: 35

1B.25

What is the minimum uncertainty in the speed of an electron confined within a lead atom of diameter 350. pm? Model the atom as a one-dimensional box with a length equal to the diameter of the actual atom. I was trying to solve a problem using the equation \bigtriangleup p\bigtriangleup x\geq \frac{h...
by Brianna Martilla 1C
Wed Oct 21, 2020 6:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Homework up to Q19 and Midterm 1 [ENDORSED]
Replies: 7
Views: 137

Re: Homework up to Q19 and Midterm 1 [ENDORSED]

I am wondering if sapling is not in the same order for everyone because some of my questions 1-19 do cover material we have not yet learned such as quantum numbers and some questions past 19 cover material that we have learned such as DeBroglie. Is there anyway that a list of the specific questions...
by Brianna Martilla 1C
Wed Oct 21, 2020 4:27 pm
Forum: Properties of Electrons
Topic: Properties of Electrons and Matter as a Whole
Replies: 5
Views: 53

Re: Properties of Electrons and Matter as a Whole

Yes that is correct. Electrons have wavelike properties because they can be diffracted by light, and particle-like properties because they have a mass that can collide with other masses (other particles/electrons). The reason larger objects in classical mechanics do not possess wavelike properties i...
by Brianna Martilla 1C
Wed Oct 21, 2020 9:39 am
Forum: Administrative Questions and Class Announcements
Topic: Respondus Setup factored in Midterm time?
Replies: 2
Views: 26

Re: Respondus Setup factored in Midterm time?

I highly doubt they would ever take away time from the midterm from us. I took a Respondus test for another class and the timer at the top didn't start until I finished taking the pictures and setting up. Also, my TA said if we want we should show up early to the discussion so that we can set up, an...
by Brianna Martilla 1C
Wed Oct 21, 2020 9:33 am
Forum: DeBroglie Equation
Topic: Sapling Question #10
Replies: 8
Views: 108

Re: Sapling Question #10

Use lambda=h/mv. h is a constant and velocity is given to us. To find m, divide the mass of two fluorine molecules by Avogadro's number to get the mass of one particle, then convert that value to kg because h, Planck's constant, is in units of Js, or kg*(m^2)*(s^-2)*s. Lastly, remember to use the co...
by Brianna Martilla 1C
Wed Oct 21, 2020 9:20 am
Forum: Empirical & Molecular Formulas
Topic: Diatomic Elements
Replies: 3
Views: 21

Re: Diatomic Elements

I believe the problem will state it is diatomic.
by Brianna Martilla 1C
Mon Oct 19, 2020 11:25 pm
Forum: Einstein Equation
Topic: Sapling homework Question 9
Replies: 3
Views: 51

Re: Sapling homework Question 9

Whenever I am given a problem I always see what is given and what I am being asked to find. We are given the value for energy and we are asked to find the wavelength. We can use E=hc/lambda, rewrite that as lambda=hc/E, then solve for lambda because h and c are constants. Just make sure to convert y...
by Brianna Martilla 1C
Sat Oct 17, 2020 8:12 pm
Forum: Properties of Light
Topic: Frequency vs Wavelength
Replies: 22
Views: 141

Frequency vs Wavelength

Hey everyone I have a clarification question. I know that we organize and separate waves by their wavelength, but does the frequency have any effect on what type of wave it is? I understand what each term means and its significance to solving equations, but I was just wondering if frequency has a di...
by Brianna Martilla 1C
Sat Oct 17, 2020 8:04 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 203
Views: 1295

Re: How are you studying?

From what I've noticed Professor Lavelle stresses doing the homework problems which are on the syllabus. When I do the problems, I make sure not to check the textbook answer guide until I am done so that I'm not relying on it subconsciously. Also of course going to the drop-in sessions, office hours...
by Brianna Martilla 1C
Sat Oct 17, 2020 8:00 pm
Forum: Administrative Questions and Class Announcements
Topic: STEP UP SESSIONS
Replies: 3
Views: 19

Re: STEP UP SESSIONS

I have not attended a full one, but instead I like to pop in and listen. They were doing practice problems one at a time, chosen by the UA.
by Brianna Martilla 1C
Sat Oct 17, 2020 7:55 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Midterm #1
Replies: 3
Views: 33

Re: Midterm #1

It's a bit late, but someone posted these videos about the Heisenberg Uncertainty Principle. by Mackenzie Van Valkenburgh 3G » Sat Oct 17, 2020 7:25 pm These videos give some background information and explanations of the Heisenberg Uncertainty Principle. I found them helpful, so hopefully someone e...
by Brianna Martilla 1C
Sat Oct 17, 2020 7:49 pm
Forum: Properties of Light
Topic: Conversions of Units and Equations
Replies: 3
Views: 31

Re: Conversions of Units and Equations

I think we will be allowed to use the one on his website, but I'm not sure about the conversions. I would just know m to nm because it is common for the quantum questions.
by Brianna Martilla 1C
Tue Oct 06, 2020 4:21 pm
Forum: Limiting Reactant Calculations
Topic: Sapling HW 10
Replies: 3
Views: 60

Re: Sapling HW 10

Thank you Mary, I finally got it!
by Brianna Martilla 1C
Tue Oct 06, 2020 3:20 pm
Forum: Limiting Reactant Calculations
Topic: Sapling HW 10
Replies: 3
Views: 60

Sapling HW 10

I have looked through every post about question 10 and still can't figure my problem out. Any help is appreciated. Problem: Consider the nucleophilic addition reaction of 2‑butanone with excess propyl magnesiumbromide, made in situ by reacting 1‑bromopropane with metallic magnesium, to make 3‑methyl...
by Brianna Martilla 1C
Tue Oct 06, 2020 2:51 pm
Forum: Molarity, Solutions, Dilutions
Topic: Sapling HW Question 5
Replies: 10
Views: 111

Re: Sapling HW Question 5

Thank you all. I realized I was using the molar mass of N (nitrogen), not Na (sodium). I don't know why but I always mix those up.
by Brianna Martilla 1C
Tue Oct 06, 2020 12:33 pm
Forum: Molarity, Solutions, Dilutions
Topic: Sapling HW Question 5
Replies: 10
Views: 111

Sapling HW Question 5

Calculate the percent composition by mass of each element in NaClO3. Na= 14.37% Cl= 36.38% O= 49.25% These are my answers for question 5 but it's incorrect. I solved by dividing the molar mass of each element over the molar mass of the whole molecule, then changing it to a percentage, so I don't kno...
by Brianna Martilla 1C
Tue Oct 06, 2020 12:00 pm
Forum: Administrative Questions and Class Announcements
Topic: UA and Workshops
Replies: 2
Views: 28

Re: UA and Workshops

Go to his website and click on the link called "Peer Learning Sessions and Step-up Program". The zoom links are hyper-linked and colorcoded within the schedule.
by Brianna Martilla 1C
Tue Oct 06, 2020 11:57 am
Forum: Student Social/Study Group
Topic: Zoom Lectures
Replies: 11
Views: 96

Re: Zoom Lectures

Professor Lavelle's lectures are pre-recorded yes, besides his office hours. But the TAs and UAs all have live sessions throughout the week. The schedule is on his website and there are several every day.
by Brianna Martilla 1C
Tue Oct 06, 2020 10:11 am
Forum: Significant Figures
Topic: Sig Figs for Molar Mass
Replies: 14
Views: 115

Re: Sig Figs for Molar Mass

I think we should use the most sig figs that are available when solving, then round the answer's sig figs to the number in the problem with the least sig figs.
by Brianna Martilla 1C
Tue Oct 06, 2020 10:03 am
Forum: Significant Figures
Topic: Tips for counting sig figs?
Replies: 9
Views: 86

Tips for counting sig figs?

I am working on week 1 homework, question 4, and I am quite rusty on counting significant figures. Does anyone have any tips or ways they remember? thanks

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