Search found 44 matches

by Emily_4B
Wed Nov 20, 2019 5:05 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: Boiling Point
Replies: 7
Views: 27

Re: Boiling Point

sarahsalama1G wrote:if something had hydrogen bonding, it would have a high boiling point correct?

Yes it’s the second strongest bond after ionic bonding
by Emily_4B
Wed Nov 20, 2019 4:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T-Shaped ??
Replies: 7
Views: 45

Re: T-Shaped ??

sarahsalama1G wrote:What are the bond angles for T-shaped?

They have 90 and 180 degrees angles
by Emily_4B
Sun Nov 17, 2019 12:51 am
Forum: General Science Questions
Topic: Chem BL
Replies: 7
Views: 28

Re: Chem BL

My friend who is currently taking Chem 14B and BL this quarter advised me to not take them at the same time for that reason, so I think it’s true.
by Emily_4B
Sun Nov 17, 2019 12:49 am
Forum: General Science Questions
Topic: Time Management Tips in Test
Replies: 5
Views: 25

Re: Time Management Tips in Test

I find that if I’m taking too long to figure out a problem at the beginning it helps me to skip it and do an easier problem so by the time I go back to the harder question I’m more calm and ready to process it.
by Emily_4B
Sun Nov 17, 2019 12:42 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 6
Views: 32

Re: Lone Pairs

lone pairs count towards molecular geometry not electron domain geometry. so in the case of 4 electron domains (3 bonding and one lone pair), the electron domain geometry would be tetrahedral while the molecular geometry would be trigonal pyramidal. So if asked in a question what shape a certain mo...
by Emily_4B
Wed Nov 13, 2019 8:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Answers
Replies: 10
Views: 88

Re: Midterm Answers

Matt Sanruk 4F wrote:That's because you gotta convert it from kg to g

Wait bro it’s supposed to be in kg
by Emily_4B
Wed Nov 13, 2019 3:42 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Answers
Replies: 10
Views: 88

Re: Midterm Answers

yikes thanks
by Emily_4B
Wed Nov 13, 2019 3:37 pm
Forum: *Shrodinger Equation
Topic: Midterm
Replies: 11
Views: 129

Re: Midterm

Matt Sanruk 4F wrote:I'm going to need to do well on those tests after that midterm!

Same, or miraculously get extra credit opportunities
by Emily_4B
Wed Nov 13, 2019 3:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Answers
Replies: 10
Views: 88

Re: Midterm Answers

Does anyone know why on question 3A. The solutions use 9.109x10^-34 instead of 9.109x10^-31 as it states in the equation sheet for the mass of an electron
by Emily_4B
Thu Nov 07, 2019 7:12 pm
Forum: Photoelectric Effect
Topic: Midterm 1
Replies: 9
Views: 68

Re: Midterm 1

AngieGarcia_4F wrote:
Emily_4B wrote:Do you guys know if we’ll get the midterm back or be able to look at it in office hours to review this question?

My TA went over the midterm during discussion so maybe yours will too.

That sounds really helpful, thanks!
by Emily_4B
Thu Nov 07, 2019 7:08 pm
Forum: Photoelectric Effect
Topic: Midterm 1
Replies: 9
Views: 68

Re: Midterm 1

Do you guys know if we’ll get the midterm back or be able to look at it in office hours to review this question?
by Emily_4B
Thu Nov 07, 2019 6:55 pm
Forum: Ionic & Covalent Bonds
Topic: Bond Strength
Replies: 12
Views: 38

Re: Bond Strength

Ionic bonds tend to be stonger than covalent bonds
by Emily_4B
Thu Nov 07, 2019 6:43 pm
Forum: Lewis Structures
Topic: Exceptions for the octet rule
Replies: 5
Views: 40

Re: Exceptions for the octet rule

Many of the elements with n is greater or equal to 3 can have an expanded octet, for example, chlorine and iodine. In addition, Boron and Aluminum sometimes do not have a complete octet and instead only have 6 valence electrons as it minimizes formal charge (ie BF3). Why do Br and Al not need to ha...
by Emily_4B
Thu Nov 07, 2019 6:34 pm
Forum: General Science Questions
Topic: Week 6 homework problems
Replies: 7
Views: 58

Re: Week 6 homework problems

I would suggest the chemical bonds section because its the last thing we covered.
by Emily_4B
Wed Nov 06, 2019 4:10 pm
Forum: Properties of Light
Topic: test room
Replies: 2
Views: 39

Re: test room

It depends on your lecture time and last name. Go on the class website and click on midterm review sessions and rooms; it’s listed on there. I attached a screenshot of it for convenience
by Emily_4B
Sat Nov 02, 2019 3:00 pm
Forum: Ionic & Covalent Bonds
Topic: Strength of covalent bonds (2d.3)
Replies: 3
Views: 25

Re: Strength of covalent bonds (2d.3)

Recall that ionic bonds form between molecules with a high difference in electronegativity, usually those with a electronegativity difference greater than 2. BaBr2 is the only molecule that primarily forms ionic bonds because the difference in electronegativity between Ba and Br is greater than 2. ...
by Emily_4B
Sat Nov 02, 2019 2:47 pm
Forum: Lewis Structures
Topic: Midterm Topics
Replies: 8
Views: 33

Re: Midterm Topics

In Friday’s lecture Lavelle said that everything up until the last slide he showed that day would be on the midterm, the last slide was interactions between ions and molecules
by Emily_4B
Sat Nov 02, 2019 2:44 pm
Forum: Lewis Structures
Topic: central atom
Replies: 16
Views: 86

Re: central atom

Would using the element with the lowest ionization energy be synonymous to the lowest electronegativity?
by Emily_4B
Sat Nov 02, 2019 2:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Midterm
Replies: 6
Views: 62

Re: Midterm

we didn’t cover it so I don’t think it’ll be on the midterm
by Emily_4B
Sat Nov 02, 2019 2:26 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 4
Views: 15

Re: Drawing Lewis Structures

I believe this is where finding the formal charges for each atom comes in and then placing the double bonds in a position that creates the lowest formal charge possible
by Emily_4B
Thu Oct 24, 2019 6:50 pm
Forum: Resonance Structures
Topic: Different Resonance Structures
Replies: 4
Views: 21

Re: Different Resonance Structures

Dr.Lavelle also mentioned that resonance structures show the limitations of Lewis structures since the actual models tend to have an average of the different bond lengths!
by Emily_4B
Thu Oct 24, 2019 6:43 pm
Forum: Ionic & Covalent Bonds
Topic: Does the Octet Rule apply to Boron?
Replies: 14
Views: 71

Re: Does the Octet Rule apply to Boron?

What other elements are not subject to the octet rule?
by Emily_4B
Wed Oct 23, 2019 5:11 pm
Forum: Ionic & Covalent Bonds
Topic: What topic are we on?
Replies: 11
Views: 78

Re: What topic are we on?

I think you could do problems from either or both topics and be fine since the last topic we covered Monday was still under the Quantum world and today we started the new unit.
by Emily_4B
Wed Oct 23, 2019 5:05 pm
Forum: Lewis Structures
Topic: Ion lewis structure
Replies: 9
Views: 38

Re: Ion lewis structure

Is there any case where the atoms lewis structure doesn’t have a full octet?
by Emily_4B
Wed Oct 23, 2019 4:59 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 2
Views: 18

Re: Electron Configuration

Write the order of the electron configuration from increasing energy level (n=1, 2, 3, etc.). So that's why if you remember in class we put for element Sc's electron configuration the 3d shell before the 4s shell even though, if you read it based off the periodic table 3d comes after the 4s shell. ...
by Emily_4B
Sun Oct 20, 2019 3:49 pm
Forum: *Shrodinger Equation
Topic: Schrodinger Equation
Replies: 3
Views: 34

Re: Schrodinger Equation

Ali Polansky 1A wrote:Ψ means wavefunction.
the equation is E(wavefunction)= H (wavefunction)

where H= hamiltonian (double derivative)
E= energy of the electron

What does the Hamiltonian represent in terms of wavefunction?
by Emily_4B
Sun Oct 20, 2019 3:35 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1.B.15?
Replies: 2
Views: 10

Re: 1.B.15?

Can you post the whole question
by Emily_4B
Sun Oct 20, 2019 3:33 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1.B #27
Replies: 4
Views: 22

Re: 1.B #27

chari_maya 3B wrote:Wouldn't the total uncertainty be 10 m/s, because the uncertainty is 5.00 m/s +/- 5.0 m/s?

Do you always add the numbers to find the total uncertainty?
by Emily_4B
Fri Oct 18, 2019 12:01 am
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 3
Views: 21

Re: Quantum Numbers

how do you know which combinations are possible/not possible for the values?
by Emily_4B
Thu Oct 17, 2019 11:19 pm
Forum: *Shrodinger Equation
Topic: psi vs psi^2
Replies: 7
Views: 48

Re: psi vs psi^2

What do we need to apply psi and psi^2 to, in terms of equations?
by Emily_4B
Thu Oct 17, 2019 11:15 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Lyman vs Balmer Series
Replies: 2
Views: 17

Re: Lyman vs Balmer Series

As long as the electron returns back to n=1, it is called the Lyman series (UV light) and for the Balmer series the electron returns to n=2 (visible light)
by Emily_4B
Wed Oct 09, 2019 9:37 pm
Forum: Molarity, Solutions, Dilutions
Topic: Fundamentals G
Replies: 4
Views: 43

Re: Fundamentals G

Do the same steps you did for part (a) except now use the molar mass of CuSO4•5H20, which is 249.68. So you’d have to multiply (.2 M)(0.250 L)(249.68 g/mol)=12 g of CuSO4•5H20
by Emily_4B
Wed Oct 09, 2019 9:18 pm
Forum: Properties of Light
Topic: Atomic Spectra
Replies: 7
Views: 58

Re: Atomic Spectra

Yes, in the Lyman series an electron goes from n ≥ 2 to n = 1, while in the balmer series an electron goes from n ≥ 3 to n = 2.
by Emily_4B
Wed Oct 09, 2019 9:10 pm
Forum: Quantum Numbers and The H-Atom
Topic: Frequency
Replies: 15
Views: 113

Re: Frequency

Energy is directly proportional to frequency according to the equation E = hν. So, the trend in increasing energy matches the trend in increasing frequency.
by Emily_4B
Wed Oct 09, 2019 9:05 pm
Forum: Properties of Light
Topic: Constants in the Quantum World
Replies: 6
Views: 37

Re: Constants in the Quantum World

so the constants will be given, but will the formulas that use the constants be given or do we have to memorize the different formulas?
by Emily_4B
Wed Oct 09, 2019 8:55 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 1067

Re: Week 2 Homework Problems [ENDORSED]

Does anyone know the energy of microwaves? Arrange the following types of photons of electromagnetic radiation in order of increasing energy: g -rays, visible light, ultraviolet radiation, microwaves, x-rays. Microwaves fall between radio waves and infrared, so from lowest to highest energy it woul...
by Emily_4B
Wed Oct 09, 2019 8:00 pm
Forum: SI Units, Unit Conversions
Topic: Test 1_Supplies [ENDORSED]
Replies: 5
Views: 74

Re: Test 1_Supplies [ENDORSED]

Do remember to take your own calculator though!
by Emily_4B
Fri Oct 04, 2019 4:13 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: sig figs
Replies: 20
Views: 129

Re: sig figs

Yes as the previous post mentioned you want to round off your number of significant figures to the same amount of sig figs that the question has :)
by Emily_4B
Fri Oct 04, 2019 4:08 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Theoretical vs. Actual Yield
Replies: 38
Views: 273

Re: Theoretical vs. Actual Yield

Can't the theoretical yield also be higher than the actual yield? For example if you incorrectly weighed something or there were impurities in the final product, then the mass would increase and be greater. Yes the theoretical yield is higher than the actual yield since the theoretical yield repres...
by Emily_4B
Fri Oct 04, 2019 4:01 pm
Forum: Empirical & Molecular Formulas
Topic: Difference between empirical and molecular formulas
Replies: 6
Views: 54

Re: Difference between empirical and molecular formulas

Sometimes I remember them by thinking that an (E)mpirical formula is an (E)asier simplification of the molecular formula’s ratios.
by Emily_4B
Fri Oct 04, 2019 3:57 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E.16
Replies: 2
Views: 31

Re: E.16

The chloride is MCl, and to find the molar mass you would first find the molar mass of the M in M2O. 231.74 = 2(molar mass of M) + 16. Then by solving this you find that the molar mass of M = 107.87 g/mol. Now you can use this molar mass to find the molar mass of the chloride, MCl. The molar mass of...
by Emily_4B
Fri Oct 04, 2019 3:43 pm
Forum: Balancing Chemical Reactions
Topic: Strategies for Balancing Chemical Equations
Replies: 12
Views: 65

Re: Strategies for Balancing Chemical Equations

It might also help to examine the full equation and start with the elemnts or molecules taht appear the least amount of times on each side and work your way up. Yes I totally agree with this. One of the TA’s in the step up program recommended we balance equations this way and it’s actually been ver...
by Emily_4B
Fri Oct 04, 2019 3:33 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 129
Views: 75226

Re: Reading the textbook [ENDORSED]

Reading the textbook can sometimes intimidate me, especially when I look at certain homework problems and they incorporate elements we didn’t specifically learn about. If any of you could recommend YouTube channels or other online videos/websites you guys use to help better understand the course mat...
by Emily_4B
Tue Oct 01, 2019 6:58 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 117
Views: 1714

Re: Advice from a Medical Student - Part II [ENDORSED]

Thank you for taking time out of your probably busy schedule to help all of us! I was wondering if you had any specific advice on time management and studying tips that you’ve learned over the years.

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