Search found 34 matches
- Sun Dec 09, 2018 3:07 am
- Forum: Lewis Acids & Bases
- Topic: Al as a Lewis Acid
- Replies: 2
- Views: 533
Re: Al as a Lewis Acid
I have a question about this too!
- Sun Dec 09, 2018 3:03 am
- Forum: Student Social/Study Group
- Topic: Chemistry News
- Replies: 135
- Views: 170046
Re: Chemistry News
Hilda Sauceda 3C wrote:does anyone know is there is gonna be a study guide?
There will never be a studyguide, but at least Lavelle has many resources we can use like Chem community!
- Sun Dec 09, 2018 3:00 am
- Forum: General Science Questions
- Topic: Can We Take The Final In Pencil?
- Replies: 14
- Views: 1631
Re: Can We Take The Final In Pencil?
I also hate writing in pen, but i usually do problems that have more change of being erased (lewis dot structures) in pencil first, then writing over it in pen once im sure about my answer.
- Sun Dec 09, 2018 2:58 am
- Forum: Student Social/Study Group
- Topic: Bronsted Bases
- Replies: 2
- Views: 613
Re: Bronsted Bases
Thank you!!
- Sun Dec 09, 2018 2:56 am
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student [ENDORSED]
- Replies: 297
- Views: 426791
Re: Advice from a Medical Student [ENDORSED]
Thank you so much for your advice!
- Sun Dec 09, 2018 2:54 am
- Forum: Photoelectric Effect
- Topic: Finding frequency
- Replies: 2
- Views: 2472
Re: Finding frequency
Since we are given the wavelength of an electron, you must use the de Broglie equation, and in this case we would use it to find the velocity of the electron. (wavelength of particle = plancks constant / momentum (mass x velocity)). Since we know all values except for velocity, we can find it. Once ...
- Sun Dec 09, 2018 2:47 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate
- Replies: 3
- Views: 452
Re: Polydentate
Just like these posts have said, a polydentate has more than one ligand bounded to it (transition metal). Therefore, a monodentate is when the metal just has one. Keep in mind that polydentates will forma chelate, which is a ring structure in the molecule.
- Fri Dec 07, 2018 1:55 am
- Forum: *Crystal Field Theory
- Topic: Crystal Field Theory
- Replies: 5
- Views: 1765
Re: Crystal Field Theory
To what extent do we need to know the Crystal Field Theory for 14A?
- Fri Dec 07, 2018 1:54 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3705698
Re: Post All Chemistry Jokes Here
Q: If H-two-O is the formula for water, what is the formula for ice?
A: H-two-O-CUBED
A: H-two-O-CUBED
- Fri Dec 07, 2018 1:52 am
- Forum: Identifying Acidic & Basic Salts
- Topic: HW 12.17
- Replies: 2
- Views: 380
Re: HW 12.17
The previous post perfectly explains this. The answers are therefore basic, acidic, amphoteric, and amphoteric in that order.
- Fri Dec 07, 2018 1:49 am
- Forum: Biological Examples
- Topic: Cisplatin Example
- Replies: 5
- Views: 653
Re: Cisplatin Example
Thank you for your help everyone!
- Fri Dec 07, 2018 1:48 am
- Forum: *Stereochemistry
- Topic: What's a stereocenter?
- Replies: 5
- Views: 2247
Re: What's a stereocenter?
Do we need to know this for the final?
- Fri Dec 07, 2018 1:45 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Are all pH calculations done to 2 decimal places or do we use sig figs in pH calculations? [ENDORSED]
- Replies: 2
- Views: 1417
Re: Are all pH calculations done to 2 decimal places or do we use sig figs in pH calculations? [ENDORSED]
pH calculations only follow sig figs after the decimal point! so two sig figs after the decimal point makes sense.
- Mon Nov 19, 2018 6:34 pm
- Forum: Hybridization
- Topic: Sigma/Pi bonds
- Replies: 6
- Views: 866
Re: Sigma/Pi bonds
A sigma bond (σ bond) is a bond formed by the overlap of orbitals in an end-to-end fashion, with the electron density concentrated between the nuclei of the bonding atoms. A pi bond (π bond) is a bond formed by the overlap of orbitals in a side-by-side fashion with the electron density concentrated...
- Mon Nov 19, 2018 6:31 pm
- Forum: Hybridization
- Topic: electron density in regards to # of hybrid orbitals
- Replies: 4
- Views: 465
Re: electron density in regards to # of hybrid orbitals
Think of it the other way around. The number of electron densities determine the hybridization. For example, 2 e- densities correspond with sp, 3 e- densities correspond with sp2, and so fourth. Keep in mind that once there are 5 e- densities, the hybridization becomes sp3d, or dsp3. We know this fr...
- Mon Nov 19, 2018 6:26 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angle
- Replies: 8
- Views: 798
Re: Bond Angle
Why is the axial bond angle of a seesaw molecule less than 180 degrees but the axial bond angle of a T shape molecule is 180 degrees? Does the T shape molecule not also experience electron repulsions from the lone pairs in the equitorial plane? The seesaw bond angle is less than 180 because there a...
- Sun Nov 11, 2018 9:16 pm
- Forum: General Science Questions
- Topic: BruinCast [ENDORSED]
- Replies: 4
- Views: 778
Re: BruinCast [ENDORSED]
Does anyone know any chem professors who do bruincast? Like for 14b/c/d?
- Sun Nov 11, 2018 9:15 pm
- Forum: Student Social/Study Group
- Topic: Study Group Chat?
- Replies: 4
- Views: 641
Study Group Chat?
I was wondering if there was a Chem 14A group chat on facebook or even a group me? If not is anyone willing to join?
- Sun Nov 04, 2018 2:04 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 3
- Views: 481
Re: Formal Charge
The key is to minimize the charges to the charge of the molecule given. An quicker way to see the formal charge of an atom is to: 1) Find out how many valence electrons there is and 2) subtract the number of dots (lone pair electrons, count each one) and lines (shared bonds) around it.
- Sun Nov 04, 2018 1:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
- Replies: 121
- Views: 20107
Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
@Kevin Tang, This is because Chromium strives to fulfill the half-filled orbital energy, making it more stable. So instead of 3p4 4s2, it is 3p5 4s1. This is (I think) the only exception when it comes to electron configuration. (as well as all elements in the same group.)
- Sun Nov 04, 2018 1:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
- Replies: 121
- Views: 20107
Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
@Kevin Tang, This is because Chromium strives to fulfill the half-filled orbital energy, making it more stable. So instead of 3p4 4s2, it is 3p5 4s1. This is (I think) the only exception when it comes to electron configuration. (as well as all elements in the same group.)
- Sun Nov 04, 2018 1:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
- Replies: 121
- Views: 20107
Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
He really is too good. THE MVP!!!
- Sun Oct 28, 2018 4:36 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3705698
Re: Post All Chemistry Jokes Here
I'd be the photon to your electron and take you to an excited state.
- Sun Oct 28, 2018 4:30 pm
- Forum: Ionic & Covalent Bonds
- Topic: the Octet rule
- Replies: 21
- Views: 4144
Re: the Octet rule
Yes they always look for the full octet.
- Sun Oct 28, 2018 4:26 pm
- Forum: *Shrodinger Equation
- Topic: Using the Schrodinger Equation
- Replies: 3
- Views: 678
Re: Using the Schrodinger Equation
You use the Schrodinger equation to find the allowed energy levels of quantum mechanical systems, like atoms. The wavefunction gives the probability of finding the particle at a certain position x. However, I do not think we are required to know exactly how it works for an exam/test
- Sun Oct 21, 2018 4:30 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: spin part of orbitals?
- Replies: 5
- Views: 477
Re: spin part of orbitals?
Lavelle introduced spin by explaining the electron spin experiment in class. It just demonstrates the spin on the electron, but nothing to do with the orbital itself.
- Sun Oct 21, 2018 4:27 pm
- Forum: *Black Body Radiation
- Topic: Test
- Replies: 9
- Views: 1297
Re: Test
I asked my TA and black body radiation is not focused on in this class, let alone for this test. I think Lavelle just mentioned it in class to prove a point.
- Sun Oct 21, 2018 4:26 pm
- Forum: Properties of Light
- Topic: Test 2
- Replies: 7
- Views: 626
Re: Test 2
Adding onto this, my TA said that test 2 is going to be a lot more conceptual based, so I think it's important to study the concepts that Lavelle goes through in class.
- Sun Oct 14, 2018 10:20 pm
- Forum: Properties of Light
- Topic: C=Wavelength*Frequency
- Replies: 11
- Views: 3249
Re: C=Wavelength*Frequency
C is the constant for the speed of light. 3.00 x 10^8 m/s
- Sun Oct 14, 2018 10:17 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3705698
Re: Post All Chemistry Jokes Here
What kind of fish is made out of two sodium ions?
2 Na.
2 Na.
- Sun Oct 14, 2018 10:15 pm
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 445093
Re: Rusty on High School Chem [ENDORSED]
I'm in the same position. I'm sure that as long this course isn't taken lightly and you try your hardest, utilizing all of the resources given to us, you will do well!
- Thu Oct 04, 2018 8:11 pm
- Forum: Empirical & Molecular Formulas
- Topic: F5 (6TH EDITION)
- Replies: 5
- Views: 525
Re: F5 (6TH EDITION)
You have to find the overall mass of C7H15NO3, then divide that mass by the mass of each element. Remember each atom too, for example, it's not just 1 Carbon you divide, but 7 (the mass).
- Thu Oct 04, 2018 8:09 pm
- Forum: Significant Figures
- Topic: Determining Sig Figs
- Replies: 6
- Views: 457
Determining Sig Figs
I get confused on when to "obey" the sig figs given in a question, and when not to. I overheard someone saying if there's multiplication, then you use the sig figs given in the question? Can someone clarify this for me, thanks.
- Thu Oct 04, 2018 8:06 pm
- Forum: Balancing Chemical Reactions
- Topic: Order of balancing an equation
- Replies: 8
- Views: 674
Re: Order of balancing an equation
To add on to this, for me it depends. If there is a longer molecule that you know is not balanced on both sides, I try to solve this first. If both sides are pretty simple, I just balance what I see in order from left to right.