Search found 51 matches

by Veronica Soliman 4H
Tue Dec 04, 2018 7:43 pm
Forum: General Science Questions
Topic: Can We Take The Final In Pencil?
Replies: 8
Views: 172

Can We Take The Final In Pencil?

I do not feel comfortable using pen on exams. Would I be able to take the final in pencil please?
by Veronica Soliman 4H
Mon Dec 03, 2018 12:05 pm
Forum: Polyprotic Acids & Bases
Topic: Polyprotic Question!
Replies: 8
Views: 537

Re: Polyprotic Question!

Poly: more than one
These can lose more than one proton.
by Veronica Soliman 4H
Mon Dec 03, 2018 11:23 am
Forum: Administrative Questions and Class Announcements
Topic: Final Grades
Replies: 10
Views: 177

Re: Final Grades

I think the final grades will be curbed based on the averages for the midterms, quizzes, and finals. So if the average for the midterm was an 83, the highest score would probably set this curve and anyone below this would actually have gotten less than what they got.
by Veronica Soliman 4H
Mon Dec 03, 2018 11:21 am
Forum: Determining Molecular Shape (VSEPR)
Topic: AX3E
Replies: 18
Views: 160

Re: AX3E

If you imagine this in 3D space, you can see that it is trigonal pyramidal tetrahedral. It is easy to confuse this with it being bent but be careful not to make that mistake.
by Veronica Soliman 4H
Mon Dec 03, 2018 11:19 am
Forum: Hybridization
Topic: Double and Triple Bonds
Replies: 17
Views: 140

Re: Double and Triple Bonds

Nope! The only thing that affects hybridization is the electron configuration from what I understand. For example, a linear electron configuration means that the hybridization is sp.
by Veronica Soliman 4H
Mon Dec 03, 2018 11:18 am
Forum: Dipole Moments
Topic: Polarity
Replies: 7
Views: 113

Re: Polarity

It's polar if it's got a dipole moment which means the little arrow with a plus sign points toward the more electronegative element (usually oxygen, occasionally carbon...etc) This is only polar if the dipole moments cancel out. You can have a situation where there are dipole moments and it is nonp...
by Veronica Soliman 4H
Tue Nov 27, 2018 6:21 pm
Forum: Ionic & Covalent Bonds
Topic: greater ionic character
Replies: 5
Views: 70

Re: greater ionic character

005199302 wrote:CO2 is father apart, but CS2 is more electronegative


How do you know this?
by Veronica Soliman 4H
Tue Nov 27, 2018 6:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma and Pi bonds
Replies: 4
Views: 79

Re: Sigma and Pi bonds

Sigma bonds allow bound atoms to rotate resulting, the sigma bond has electron denity and has cylindrical symmetry around the internuclear axis. It is also more stable. Pi Bond make it impossible to rotate or pi bond breaks, restriction on double and triple bonds, when 2 atoms are bound, then addit...
by Veronica Soliman 4H
Tue Nov 27, 2018 6:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polarity vs. nonpolarity
Replies: 8
Views: 96

Re: polarity vs. nonpolarity

LOOK FOR THE DIPOLE MOMENT that doesn't cancel to 0. For example, hydrogen bonding is polar because it is a dipole-dipole interaction whereas weaker intermolecular forces like van der waals are nonpolar.
by Veronica Soliman 4H
Tue Nov 27, 2018 6:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 3
Replies: 38
Views: 550

Re: Test 3

Emily Li 4A wrote:
DavidEcheverri3J wrote:Will we also need to know the degrees of the shapes?


I think it's very likely that we have to know them, but at least we can use simple math to find angles in most of the shapes.


I think it's helpful to know the molecular structure, electron structure, angles, and the way it looks.
by Veronica Soliman 4H
Tue Nov 27, 2018 6:11 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 7
Views: 113

Re: Polarity

It's polar if it's got a dipole moment which means the little arrow with a plus sign points toward the more electronegative element (usually oxygen, occasionally carbon...etc)
by Veronica Soliman 4H
Fri Nov 23, 2018 6:20 pm
Forum: Dipole Moments
Topic: Bond Angles
Replies: 8
Views: 96

Re: Bond Angles

Do lots of problems
by Veronica Soliman 4H
Fri Nov 23, 2018 6:02 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 3
Replies: 10
Views: 190

Re: Test 3

Expect the unexpected.
by Veronica Soliman 4H
Fri Nov 23, 2018 6:01 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework for week 9
Replies: 11
Views: 153

Re: Homework for week 9

Hey! you can do any problems from the material that we've previously covered as long as there are 14 (instead of 7) problems completed.
by Veronica Soliman 4H
Mon Nov 19, 2018 2:45 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi Bonds [ENDORSED]
Replies: 2
Views: 44

Re: Sigma and Pi Bonds [ENDORSED]

Ok bonds exist with signma bonds and pi bonds are rigid whereas signma move usually in double bonds.
by Veronica Soliman 4H
Wed Nov 14, 2018 12:53 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Repulsion Strength
Replies: 3
Views: 65

Re: Repulsion Strength

You have to look at this in terms of covalent and ionic bonding.
by Veronica Soliman 4H
Wed Nov 14, 2018 12:51 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 5
Views: 91

Re: Bond Angles

We did a demo in class where if it’s 4 bonds, you just recall it’s a 3d shape so while you would think it is 90 degrees, it’s actually 109 because it’s 3dinensional. The first 3 are pretty self explanatory so 2 bonds would likely be farther apart and are at 180 degrees.
by Veronica Soliman 4H
Wed Nov 14, 2018 12:49 am
Forum: Octet Exceptions
Topic: What are the octet exceptions?
Replies: 9
Views: 134

Re: What are the octet exceptions?

Additionally, anything that is in the 8th valence shell area will not need to have covalent bonds or ionic bonds because noble gases are already full and happy.
by Veronica Soliman 4H
Thu Nov 08, 2018 8:11 pm
Forum: Student Social/Study Group
Topic: Homework 6
Replies: 5
Views: 130

Homework 6

For homework 6 are we allowed to answer any problems from any previous sections that we've learned or is there a cutoff for which problems we are allowed to do?
by Veronica Soliman 4H
Mon Nov 05, 2018 8:40 am
Forum: Octet Exceptions
Topic: Formal charge
Replies: 7
Views: 112

Re: Formal charge

YES! 1. Count valence electrons (left to right on periodic table using s and p only - I think) 2. Create molecule's lewis structure 3. Find the FC of each molecule, Subtract the valence # of each molecule by the amount of dots and lines for each. 4. Try to rearrange to get it to be the most stable i...
by Veronica Soliman 4H
Mon Nov 05, 2018 8:36 am
Forum: General Science Questions
Topic: MIDTERM PEN
Replies: 1
Views: 72

MIDTERM PEN

Can we use a pen with erasable ink?

Thank you.
by Veronica Soliman 4H
Mon Nov 05, 2018 8:33 am
Forum: Properties of Electrons
Topic: How do we determine the possible number of electrons when given ml?
Replies: 4
Views: 168

Re: How do we determine the possible number of electrons when given ml?

ml specifies a specific orbital. The D subshell itself has 5 orbitals (ml= -2, -1, 0, +1, +2) and therefore two electrons in each (10 total). However, the ml= -2 specifies that it is one of these 5 orbitals, which can only contain two electrons. Can you further explain this? Still confused. Sure! T...
by Veronica Soliman 4H
Mon Nov 05, 2018 8:26 am
Forum: Sigma & Pi Bonds
Topic: Midterm1
Replies: 10
Views: 204

Re: Midterm1

Where is our midterm held today??? If you are in the 2pm lecture, it is at Moore 100 It's based on last name and we are split into multiple rooms. MT is from 6-8 pm The rest of the information is from Dr. Lavelle's post on his website: 14A-1, 10am class: Last name A-L in HAINES 39. Last name M-Z in...
by Veronica Soliman 4H
Sat Nov 03, 2018 1:16 pm
Forum: Properties of Electrons
Topic: How do we determine the possible number of electrons when given ml?
Replies: 4
Views: 168

Re: How do we determine the possible number of electrons when given ml?

Sona Hakobyan 3J wrote:ml specifies a specific orbital. The D subshell itself has 5 orbitals (ml= -2, -1, 0, +1, +2) and therefore two electrons in each (10 total). However, the ml= -2 specifies that it is one of these 5 orbitals, which can only contain two electrons.



Can you further explain this? Still confused.
by Veronica Soliman 4H
Sat Nov 03, 2018 1:14 pm
Forum: General Science Questions
Topic: How do we determine number of unpaired electrons?
Replies: 1
Views: 77

How do we determine number of unpaired electrons?

Referring to chapter 2 in 6th edition #'s 2.53 and 2.51

Asking to find unpaired e- in Bi, Si, Ta, and Ni
Also how many unpaired e- in Ga, Ge, As, Se, and Br? How do you solve these?
by Veronica Soliman 4H
Sat Nov 03, 2018 12:37 pm
Forum: Properties of Electrons
Topic: How do we determine the possible number of electrons when given ml?
Replies: 4
Views: 168

How do we determine the possible number of electrons when given ml?

Number 29 in chapter 2 asks to give the number of electrons when given a certain n, l, or ml value. Part b says n=4 l=2 and ml=-2. I get that it would be 4d and without the ml value it would have 10 electrons, but the solutions manual says it only has 2 electrons and I was wondering how the ml would...
by Veronica Soliman 4H
Sat Nov 03, 2018 10:16 am
Forum: General Science Questions
Topic: Schrodinger
Replies: 2
Views: 63

Schrodinger

Hi,

I was wondering if schrondinger's equation would be on the midterm? We barely covered it in lecture and there is no module to teach it. Is there someone who can explain it or let me know if we need to study this topic?

Thanks.
by Veronica Soliman 4H
Wed Oct 31, 2018 10:21 pm
Forum: Octet Exceptions
Topic: 7th Edition 2C5.A
Replies: 2
Views: 58

Re: 7th Edition 2C5.A

I think this might have to do with the octet rule, but I am not certain.
by Veronica Soliman 4H
Wed Oct 31, 2018 10:20 pm
Forum: Properties of Electrons
Topic: Test #2 Question 3C
Replies: 2
Views: 155

Re: Test #2 Question 4C

Hi I haven't received my test 2 back yet, but when I do, I will be sure to reply here. Could you post the actual question on here so I can assist?
by Veronica Soliman 4H
Wed Oct 31, 2018 10:17 pm
Forum: SI Units, Unit Conversions
Topic: Test and Exam Dates
Replies: 10
Views: 317

Re: Test and Exam Dates

I believe they will be after the midterm and after thanksgiving
by Veronica Soliman 4H
Tue Oct 23, 2018 5:14 pm
Forum: DeBroglie Equation
Topic: Modules for Test 2
Replies: 2
Views: 90

Modules for Test 2

Which modules are recommended for module 2? They weren't listed in outline 2 so i'm uncertain.
by Veronica Soliman 4H
Tue Oct 23, 2018 2:54 pm
Forum: Properties of Light
Topic: Is light in waves or photons?
Replies: 10
Views: 222

Is light in waves or photons?

I'm v confused because one module spent 26 mins talking about how light was in waves and that mu*lambda= velocity (c speed of light) and another said that light wasn't in waves. So I'm v confused. Can someone explain this please?
by Veronica Soliman 4H
Tue Oct 23, 2018 11:18 am
Forum: Trends in The Periodic Table
Topic: 1 F 11
Replies: 2
Views: 51

Re: 1 F 11

Dr. Lavelle has a list of solution manual errors. This one is not on there, but here's the link for reference:
https://lavelle.chem.ucla.edu/wp-conten ... rs_6Ed.pdf
by Veronica Soliman 4H
Tue Oct 23, 2018 11:05 am
Forum: *Black Body Radiation
Topic: Intensity of radiation
Replies: 2
Views: 164

Re: Intensity of radiation

I do not think we need to know the Black Body effect. Dr. Lavelle discussed this in lecture and said he did not want to spend too much time on it.
by Veronica Soliman 4H
Tue Oct 16, 2018 8:19 pm
Forum: DeBroglie Equation
Topic: Formulas
Replies: 5
Views: 64

Re: Formulas

daisyjimenezt wrote:No need to memorize, they'll be provided. If you do want to remember them, focus on memorizing their derivations
'

Anyone know if they're provided on the mCAT also?
by Veronica Soliman 4H
Tue Oct 16, 2018 8:18 pm
Forum: SI Units, Unit Conversions
Topic: Test and Exam Dates
Replies: 10
Views: 317

Re: Test and Exam Dates

Josephine Chan 1B wrote:Yes, according to the test and exam schedule, we have the midterm on Nov 5 and then the next test is on the week after Thanksgiving break.


When is thanksgiving break? During which week and is it just thursday friday? 4 day weekend?
by Veronica Soliman 4H
Tue Oct 16, 2018 8:16 pm
Forum: Properties of Light
Topic: 6th Edition 1.13(a)
Replies: 2
Views: 41

Re: 6th Edition 1.13(a)

R=3.29*10^15 s^-1 which helps s calculate c=v*lambda v= R ((1/n1^2 - 1/n2^2) so when plugginf this into c=v*lambda, we get c= 2.997 * 10^8 m/s which is in velocity units... so after finding all variables, we now want to solve for lambda which can be found by plugging in n1^2=4 and n2^2=16 I hope thi...
by Veronica Soliman 4H
Tue Oct 16, 2018 8:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 96
Views: 29368

Re: Advice from a Medical Student [ENDORSED]

Thank you so much! I hope all is well in med school!
by Veronica Soliman 4H
Tue Oct 09, 2018 10:24 pm
Forum: SI Units, Unit Conversions
Topic: Atoms and Molecules
Replies: 5
Views: 114

Atoms and Molecules

Can we use atoms or molecules interchangeably when solving for problems that ask for converting moles to either or?
by Veronica Soliman 4H
Mon Oct 08, 2018 8:28 pm
Forum: Molarity, Solutions, Dilutions
Topic: Homework problem E.21
Replies: 1
Views: 42

Re: Homework problem E.21

I don't have this directly in front of me, however, as a general rule of thumb, look in the question itself for the number with the least sig figs reflect that in your answer.
by Veronica Soliman 4H
Mon Oct 08, 2018 8:27 pm
Forum: Properties of Light
Topic: Formula for energy of a photon
Replies: 4
Views: 57

Re: Formula for energy of a photon

Christine Chow 4G wrote:i dont have the seventh edition, but the energy of a photon = h (Planck's constant)* v (frequency)


However, v is actually "mu" not v.
by Veronica Soliman 4H
Mon Oct 08, 2018 8:26 pm
Forum: Balancing Chemical Reactions
Topic: States of Matter
Replies: 11
Views: 152

Re: States of Matter

In addition to everyone's comments, I'd recommend you be very careful when determining the state of water (because it has 3 states), it is best to read the question carefully and determine if the other reactants and products are hot/cold/room temperature.
by Veronica Soliman 4H
Mon Oct 08, 2018 8:23 pm
Forum: Balancing Chemical Reactions
Topic: Balancing reactions tips
Replies: 29
Views: 607

Re: Balancing reactions tips

One important tip that my TA actually spoke about was if you keep going back and forth while balancing reactions, it's probably wrong and it's best to attempt that problem from the start.
by Veronica Soliman 4H
Sun Oct 07, 2018 10:02 pm
Forum: Molarity, Solutions, Dilutions
Topic: Fundamentals E.15
Replies: 3
Views: 136

Fundamentals E.15

For e.15 on the homework, can someone explain what is meant by M? There’s no element that’s just M? I’m so confused
by Veronica Soliman 4H
Thu Oct 04, 2018 6:31 pm
Forum: Limiting Reactant Calculations
Topic: Defining compounds in equations
Replies: 3
Views: 59

Defining compounds in equations

When we write out chemical equations for either balancing or finding yield, is it necessary to define whether each compound is a liquid, solid, gas, aqueous? Additionally, would someone mind explaining in the simplest terms what aqueous means? I haven't taken basic/regular chem since 4 years ago so ...
by Veronica Soliman 4H
Tue Oct 02, 2018 10:43 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: rounding [ENDORSED]
Replies: 10
Views: 275

Re: rounding [ENDORSED]

Also, would someone let me know how to post a question? I couldn't figure out how and I've tried reading the FAQs
by Veronica Soliman 4H
Tue Oct 02, 2018 10:42 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: rounding [ENDORSED]
Replies: 10
Views: 275

Re: rounding [ENDORSED]

I don't know how to post a question, but related to this topic of rounding:

if your emperical ratio is 1:6.012 can your final answer be for example C1H6 or does it have to be to the next nearest whole number of 5 and 30? Could that work?
by Veronica Soliman 4H
Mon Oct 01, 2018 6:26 pm
Forum: SI Units, Unit Conversions
Topic: Grams/mole
Replies: 12
Views: 251

Re: Grams/mole

In short, yes both of these mean the same thing. It is a large textbook and has been edited several times before publishing, therefore, different authors may have changed the notation. They still mean the same thing. Hope this helps.
by Veronica Soliman 4H
Mon Oct 01, 2018 6:19 pm
Forum: Balancing Chemical Reactions
Topic: Law of Conservation of Mass [ENDORSED]
Replies: 7
Views: 141

Re: Law of Conservation of Mass [ENDORSED]

It's literally what happens at the beginning (or the mass at the start (mass initial)) is going to be equal to the mass final. This is usually done as was done in lecture today where we were given n = Moles*liters and given a question would just plug in the given values of of (M)*(v-liters) initial ...
by Veronica Soliman 4H
Mon Oct 01, 2018 6:14 pm
Forum: Balancing Chemical Reactions
Topic: States of Atoms
Replies: 7
Views: 104

Re: States of Atoms

Hi, since we're still doing homework and still haven't been taught this, I'd just say to look it up. Some things we can memorize later on, but for now, I think it is thoughtful to google search this if possible. I hope that if we aren't taught this by the first midterm, that we can be provided with ...

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