CHEMISTRY COMMUNITY

RandallNeeDis3K

I have a question about this too!

RandallNeeDis3K

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!

RandallNeeDis3K

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.

RandallNeeDis3K

Thank you!!

RandallNeeDis3K

Thank you so much for your advice!

RandallNeeDis3K

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 ...

RandallNeeDis3K

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.

RandallNeeDis3K

To what extent do we need to know the Crystal Field Theory for 14A?

RandallNeeDis3K

Q: If H-two-O is the formula for water, what is the formula for ice?
A: H-two-O-CUBED

RandallNeeDis3K

The previous post perfectly explains this. The answers are therefore basic, acidic, amphoteric, and amphoteric in that order.

RandallNeeDis3K

Thank you for your help everyone!

RandallNeeDis3K

Do we need to know this for the final?

RandallNeeDis3K

pH calculations only follow sig figs after the decimal point! so two sig figs after the decimal point makes sense.

RandallNeeDis3K

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...

RandallNeeDis3K

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...

RandallNeeDis3K

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...

RandallNeeDis3K

Does anyone know any chem professors who do bruincast? Like for 14b/c/d?

RandallNeeDis3K

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?

RandallNeeDis3K

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.

RandallNeeDis3K

@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.)

RandallNeeDis3K

@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.)

RandallNeeDis3K

He really is too good. THE MVP!!!

RandallNeeDis3K

I'd be the photon to your electron and take you to an excited state.

RandallNeeDis3K

Yes they always look for the full octet.

RandallNeeDis3K

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

RandallNeeDis3K

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.

RandallNeeDis3K

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.

RandallNeeDis3K

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.

RandallNeeDis3K

C is the constant for the speed of light. 3.00 x 10^8 m/s

RandallNeeDis3K

What kind of fish is made out of two sodium ions?

2 Na.

RandallNeeDis3K

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!

RandallNeeDis3K

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).

RandallNeeDis3K

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.

RandallNeeDis3K

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.

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