CHEMISTRY COMMUNITY

Linyu Zeng 1H

Will we be asked to name a compound in final? If so, do we have to memorize some of the ligand names? Yes you do have to memorize the ligand names. Lavelle has a link that leads to the name of the ligands on the class website. https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14A/Naming...

Linyu Zeng 1H

Will we be asked to name a compound in final? If so, do we have to memorize some of the ligand names?

Linyu Zeng 1H

You can whether the anions and cations will form bond with H atom or OH- in the water. For example, when Na2CO3 becomes Na+ and (CO3)2- in water, some of the (CO3)2- will form bond with H atom from water and become (HCO3)-, producing OH-. Thus, the solution should have a pH > 7.

Linyu Zeng 1H

Thank you for your help this quarter!

Linyu Zeng 1H

I think we are not required to draw pi and sigma bonds in 3-D for Test 3. knowing why they form and their differences may be enough.

Linyu Zeng 1H

hybridization helps make VSEPR model closer to the reality by mixing up the orbitals to achieve actual bonding angle.

Linyu Zeng 1H

"Draw the Lewis Structures of (I3)- and (IO3)-..."

Why doesn't Iodine atom form double bond with oxygen atom or with each other? How should we determine whether or not there should be a single bond or double bond?

Linyu Zeng 1H

What is the Lewis structure of (ClO2)-? Is the Cl atom allowed to have more than 8 e- in its bonding pairs and lone pairs?

Linyu Zeng 1H

What is an angular shape? Did I miss something in class? Is is just a bent version of Linear shape?

Linyu Zeng 1H

I'm not sure the reason why it's like this but if you are asking for their strength (from strong to weak): Ion-Ion ---- Hydrogen Bonding ---- Ion-Dipole ---- Dipole-Dipole, Dipole-Induced Dipole, Van Der Waals

Linyu Zeng 1H

bond angles are the angles between two bondings in a atom (consider the bondings as lines and the central atom as the point). I think we can predicts them by putting atoms to achieve a most stable structure (basically by putting the atoms bound to the central one as far apart as possible), and calcu...

Linyu Zeng 1H

I think we are just learning some specific VSEPR structures now. Maybe we can imagine the VSEPR structures of other molecules by drawing out their Lewis Structures and positioning the bondings and lone pairs as far apart as possible while being stable.

Linyu Zeng 1H

Does the Trigonal Planar structure means all the atoms are in the same plane? I'm kinda confused because Professor Lavelle added a 3-D structure of BF3. What is its actual structure? 2-D or 3-D?

Linyu Zeng 1H

I have the 10am lecture. We went over it today. so I guess other lectures will do the same.

Linyu Zeng 1H

I think this is right and easy to remember. Thanks for sharing with us!

Linyu Zeng 1H

Ionization energies usually increase on going from left to right across the periodic table. The ionization energy for oxygen, however, is lower than that of either nitrogen or fluorine. Explain this anomaly. I thought in the review session yesterday 3pm the TA explained that this is because O is clo...

Linyu Zeng 1H

I don't know other trends except ionization energy needed for Lewis structure. But as for ionization energy, it can help us determine the central atom, which tends to have lower IE.

Linyu Zeng 1H

I have a question about rounding my answer. The result I get without any rounding in the calculation process is 753W. But the answer on the book is 750. I don't understand why this difference happens. Should I round 753 to 750?

Linyu Zeng 1H

I think that "bonds" can be seen as something that depicts or represents the interaction and relationship between atoms. just like force in physics. so bonds don't have to be integers like single or double. Both double or single bonds don't exist in real life. we are just trying to describ...

Linyu Zeng 1H

I prefer to understand it this way: when forming covalent bonds, atoms tend to share e- so that they have 8 e- (2 s-election and 6 p-electron) in their outmost shell. so for us, we just try to make all the atoms in a covalent bond formation as close to the 8-electron state as possible.

Linyu Zeng 1H

The actual yield is the weight you actually measured in the lab (which will be given to us in tests since we can't measure it by ourselves". and the theoretical yield is what you calculate to be the weight of the products.

Linyu Zeng 1H

the values of M associated with each L can be determined separately. Just take the integers between + and - values of L.

Linyu Zeng 1H

I don't know if this is correct, but I explain it to myself in this way: The closer an electron is to the nucleus, the greater energy it needs to resist the positive charge of the nucleus. Because the energy of an electron is negative (-), so the greater the "absolute value" of its energy,...

Linyu Zeng 1H

I saw this in the bundle that was recommend. But I got the textbook alone, do I have to invest in this? I believe this is optional. So you don't necessarily have to purchase it. But actually I haven't use it to do anything by now. My suggestion is that if you feel you are falling much behind, you c...

Linyu Zeng 1H

I bought the sampling learning thing as required. But I don't know how I should use it. Will there be any homework we have to do with it? or is it just for extra resources professor may post later? I just found a assignment on it. Is it mandatory and when is it due?

Linyu Zeng 1H

Diana Chavez 1K wrote:If we do not understand what a question on the test asks is it allowed to ask for clarity from our TA's?

I think we can ask what we don't understand first and let the TAs decide whether or not it's ok to explain to us.

Linyu Zeng 1H

Is this question making analogy between baseball and photon? Does baseball follow the rule in quantum world?

Linyu Zeng 1H

This is great! Thank you!

CHEMISTRY COMMUNITY

Search found 28 matches

Re: Do we have to memorize some of the ligand names?

Do we have to memorize some of the ligand names?

Re: 6d11 7th edition

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

Re: Help with Confusion

Re: Purpose of hybridization

7th Edition #2E.13

7th Edition #2E.5(a)

Angular Shape

Re: Hydrogen Bonding versus other Intermolecular forces

Re: Bond Angles

Re: VSEPR Formula

Trigonal Planar

Re: Molecular Shape

Re: Coordinate Covalent Bond Definition

7th Edition #1.13

Re: Periodic Table Trends

7th Edition #1.3

Re: Resonance merging

Re: octet rule

Re: Percent Yield [ENDORSED]

Re: Quantum number M [ENDORSED]

Re: energy in shells closer to the nucleus

Re: How Should We Utilize Sampling

How Should We Utilize Sampling

Re: Number of questions on test one [ENDORSED]

Re: wavelength and ounces

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]