Search found 28 matches

by Linyu Zeng 1H
Sat Dec 08, 2018 4:45 pm
Forum: Naming
Topic: Do we have to memorize some of the ligand names?
Replies: 3
Views: 93

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

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...
by Linyu Zeng 1H
Sat Dec 08, 2018 3:10 pm
Forum: Naming
Topic: Do we have to memorize some of the ligand names?
Replies: 3
Views: 93

Do we have to memorize some of the ligand names?

Will we be asked to name a compound in final? If so, do we have to memorize some of the ligand names?
by Linyu Zeng 1H
Sat Dec 08, 2018 3:07 pm
Forum: Calculating the pH of Salt Solutions
Topic: 6d11 7th edition
Replies: 2
Views: 224

Re: 6d11 7th edition

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.
by Linyu Zeng 1H
Wed Nov 21, 2018 7:59 pm
Forum: Hybridization
Topic: Help with Confusion
Replies: 6
Views: 130

Re: Help with Confusion

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.
by Linyu Zeng 1H
Wed Nov 21, 2018 7:45 pm
Forum: Hybridization
Topic: Purpose of hybridization
Replies: 4
Views: 100

Re: Purpose of hybridization

hybridization helps make VSEPR model closer to the reality by mixing up the orbitals to achieve actual bonding angle.
by Linyu Zeng 1H
Wed Nov 14, 2018 10:02 pm
Forum: Lewis Structures
Topic: 7th Edition #2E.13
Replies: 3
Views: 120

7th Edition #2E.13

"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?
by Linyu Zeng 1H
Wed Nov 14, 2018 6:20 pm
Forum: Lewis Structures
Topic: 7th Edition #2E.5(a)
Replies: 2
Views: 67

7th Edition #2E.5(a)

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?
by Linyu Zeng 1H
Wed Nov 14, 2018 6:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Angular Shape
Replies: 4
Views: 69

Angular Shape

What is an angular shape? Did I miss something in class? Is is just a bent version of Linear shape?
by Linyu Zeng 1H
Fri Nov 09, 2018 12:40 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: Hydrogen Bonding versus other Intermolecular forces
Replies: 2
Views: 77

Re: Hydrogen Bonding versus other Intermolecular forces

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
by Linyu Zeng 1H
Fri Nov 09, 2018 12:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 13
Views: 277

Re: Bond Angles

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...
by Linyu Zeng 1H
Fri Nov 09, 2018 12:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Formula
Replies: 2
Views: 87

Re: VSEPR Formula

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.
by Linyu Zeng 1H
Fri Nov 09, 2018 12:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Planar
Replies: 8
Views: 136

Trigonal Planar

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?
by Linyu Zeng 1H
Fri Nov 09, 2018 12:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 2
Views: 73

Re: Molecular Shape

I have the 10am lecture. We went over it today. so I guess other lectures will do the same.
by Linyu Zeng 1H
Wed Oct 31, 2018 6:09 pm
Forum: Coordinate Covalent Bonds
Topic: Coordinate Covalent Bond Definition
Replies: 14
Views: 658

Re: Coordinate Covalent Bond Definition

I think this is right and easy to remember. Thanks for sharing with us!
by Linyu Zeng 1H
Wed Oct 31, 2018 6:01 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 7th Edition #1.13
Replies: 1
Views: 62

7th Edition #1.13

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...
by Linyu Zeng 1H
Wed Oct 31, 2018 5:47 pm
Forum: Lewis Structures
Topic: Periodic Table Trends
Replies: 2
Views: 67

Re: Periodic Table Trends

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.
by Linyu Zeng 1H
Wed Oct 31, 2018 5:40 pm
Forum: Einstein Equation
Topic: 7th Edition #1.3
Replies: 1
Views: 279

7th Edition #1.3

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?
by Linyu Zeng 1H
Wed Oct 31, 2018 5:23 pm
Forum: Resonance Structures
Topic: Resonance merging
Replies: 3
Views: 103

Re: Resonance merging

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...
by Linyu Zeng 1H
Wed Oct 31, 2018 5:08 pm
Forum: Ionic & Covalent Bonds
Topic: octet rule
Replies: 11
Views: 215

Re: octet rule

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.
by Linyu Zeng 1H
Fri Oct 19, 2018 4:16 pm
Forum: Limiting Reactant Calculations
Topic: Percent Yield [ENDORSED]
Replies: 13
Views: 784

Re: Percent Yield [ENDORSED]

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.
by Linyu Zeng 1H
Fri Oct 19, 2018 4:06 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum number M [ENDORSED]
Replies: 7
Views: 208

Re: Quantum number M [ENDORSED]

the values of M associated with each L can be determined separately. Just take the integers between + and - values of L.
by Linyu Zeng 1H
Fri Oct 19, 2018 3:54 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: energy in shells closer to the nucleus
Replies: 4
Views: 96

Re: energy in shells closer to the nucleus

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,...
by Linyu Zeng 1H
Wed Oct 17, 2018 8:50 am
Forum: Administrative Questions and Class Announcements
Topic: How Should We Utilize Sampling
Replies: 3
Views: 116

Re: How Should We Utilize Sampling

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...
by Linyu Zeng 1H
Thu Oct 11, 2018 10:17 pm
Forum: Administrative Questions and Class Announcements
Topic: How Should We Utilize Sampling
Replies: 3
Views: 116

How Should We Utilize Sampling

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?
by Linyu Zeng 1H
Thu Oct 11, 2018 10:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Number of questions on test one [ENDORSED]
Replies: 39
Views: 17735

Re: Number of questions on test one [ENDORSED]

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.
by Linyu Zeng 1H
Thu Oct 11, 2018 10:07 pm
Forum: Properties of Electrons
Topic: wavelength and ounces
Replies: 4
Views: 118

Re: wavelength and ounces

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

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