CHEMISTRY COMMUNITY

noelle_lipschutz_3F

Here is a helpful video https://www.youtube.com/watch?v=MXTsUBC0Nlk on Acidic Basic and Neutral Salts

noelle_lipschutz_3F

Can someone explain what it means to be completely ionized (in an aqueous solution eg H2O)?

noelle_lipschutz_3F

Do we need to just memorize strong acids or is there a way to derive them from understanding atomic properties?

noelle_lipschutz_3F

How do you calculate which base is stronger when given two compounds?

noelle_lipschutz_3F

How do you calculate which acid is stronger when given 2 compounds?

noelle_lipschutz_3F

Here is a good video to watch on hybridization: https://www.youtube.com/watch?v=otYj92d7rB0

noelle_lipschutz_3F

Here is a good video to watch on coordination compounds: https://www.youtube.com/watch?v=r4H5XjJPn58

noelle_lipschutz_3F

What is the definition of oxidation number?

noelle_lipschutz_3F

What is the most abundant coordination compound found on Earth?

noelle_lipschutz_3F

What is the difference between coordination numbers and oxidation states?

noelle_lipschutz_3F

What are common molecules that have square planar shape? How does this shape affect their function?

noelle_lipschutz_3F

I am drawing the following Lewis structure: AsO4 3-… why do we disrupt the octet rule for As to make this structure more stable? (Making a double bond) — making expanded octet for As… rather than just doing all single bonds and having it more unstable... Is accounting for stability more important th...

noelle_lipschutz_3F

Lecture #23 question: What does Dr. Lavelle mean by the following: the energy gap between hybridized orbitals and un-hybridized orbitals are smaller than ones of two un-hybridized orbitals?

noelle_lipschutz_3F

What is the main difference between sigma and pi bonds? 

noelle_lipschutz_3F

Can someone explain the concept of expanded octet. Why can Xe in XeF4 have an expanded octet? What qualities of Xe permit this? 

noelle_lipschutz_3F

NVM lolll there are two pages of "My Post" -- I have 35 phew

Thank you all!

noelle_lipschutz_3F

It is end of Week 7 and I have 25 posts for Chem Community... am I on target? I forgot what week we started.

noelle_lipschutz_3F

5. I am doing the following problem: 2C.1 Which of the following species are radicals? (a) NO2−… How is NO2- a radial? The book says it is… is this a mistake?

UPDATED --- The answer key in some books are incorrect. NO2- is NOT a radical.

noelle_lipschutz_3F

4. I am doing the following problem: 2B.15 Draw the Lewis structures that contribute to the resonance hybrid of nitryl chloride, ClNO2 (N is the central atom). How do you know the double bond goes to one of the Os and not the Cl?

noelle_lipschutz_3F

3. I am drawing the Lewis Structure for glycine. How do we know which element bonds to which element with such a large structure?

noelle_lipschutz_3F

2. I am doing the following problem: 2B.9 Draw the complete Lewis structure for each of the following compounds: (a) ammonium chloride; (b) potassium phosphide; (c) sodium hypochlorite. Will we need to know how to derive these formulas or will they be given to us?

noelle_lipschutz_3F

I am working on the following problem: Draw the Lewis Structure of NHF2. N is the central atom in this structure, but will H ever be a central atom in a molecule?

noelle_lipschutz_3F

How do you determine resonance structures when given one structure? Are there specific steps you follow?

noelle_lipschutz_3F

Are Lewis bases and acids on the midterm?

noelle_lipschutz_3F

How do you determine the oxidation number? For example how do you determine the number of chlorine in the percolate ion?

noelle_lipschutz_3F

Can someone explain Lewis acids and bases. I am trying to figure out which one is the base and acid for the following reaction: BF3 + F- ——> BF4- 

How do you know when a molecule can give or take an electron?

noelle_lipschutz_3F

1. I am working on the following problem: “…..However, the formulas of the nitrate ion and phosphate ion contain different numbers of oxygen atoms. This is also true for the formulas of the nitrite ion and phosphite ion. Draw the Lewis structures of the nitrite, nitrate, phosphite, and phosphate ion...

noelle_lipschutz_3F

How can you determine bond lengths given a certain bond?

noelle_lipschutz_3F

Can someone explain what resonance is?

noelle_lipschutz_3F

What type of technology is used to determine the placement of electrons for a certain element?

noelle_lipschutz_3F

I am still a bit confused with the concept of principle quantum numbers. Is n = the # of shells for a certain element (and placement for electrons?) How does n relate to the valence electrons/shell?

noelle_lipschutz_3F

1. I am doing the following Sapling problem: Draw the structure of CH2O, including lone pairs. Can someone explain to me what lone pairs are?

noelle_lipschutz_3F

Can someone help me define a unit? What is eV and how does it relate to the units Joules?

noelle_lipschutz_3F

How was the Heisenberg uncertainty principle derived? I am still so fascinated how humans can derive these equations…

noelle_lipschutz_3F

This is a random question that popped into my head while doing SI units. Why hasn’t the US converted to SI units?

noelle_lipschutz_3F

Can someone explain how to use the periodic table to determine electron affinity?

noelle_lipschutz_3F

I am working on the following problem: “Identify the neutral element represented by this excited-state electron configuration, then write the ground-state electron configuration for that element. Excited State: 1s2 2s2 2p2 3s1. Can someone explain the difference between ground state and excited state?

noelle_lipschutz_3F

Avogrado's Constant is 6.02214x10^23 mol-1 Avogadro's number, number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.02214076 × 10^23. The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the...

noelle_lipschutz_3F

How is work function for specific materials calculated? What technology is used to find work function?

noelle_lipschutz_3F

So we're going to be in a zoom call with our whole discussion group? Doesn't that mean that we'll be able to see each other's work? Yes, I'm pretty sure we will be in a zoom call with our group, however I think it will be quite hard to cheat off of each other since the TA will be watching your scre...

noelle_lipschutz_3F

https://www.youtube.com/watch?v=JeSSucG-CVw

Hey everyone,

I found this Youtube video to be really helpful when reviewing Empirical formulas!

noelle_lipschutz_3F

Hi there,

Is there anyway to access our Sapling textbook without going through CCLE?

noelle_lipschutz_3F

Does anyone have good tutoring options now that we're gonna be online for the rest of the semester and most likely the rest of the year? Preferably for students not in westwood/on campus. I really recommend utilizing Dr. Lavelle's programs put in place: Step Up program and UA help Workshops! Also, ...

noelle_lipschutz_3F

I don't think CC is available for Dr. Lavelle's videos. We should ask him if the BruinCast crew can enable them!

noelle_lipschutz_3F

Maybe could Dr. Lavelle say the title of the song before lecture? I am so curious haha! Thank you Dr. Lavelle for being so interactive this online quarter!

noelle_lipschutz_3F

For those who have been to the Step Up Sessions, how long did they last for? 1 hr? 1.5 hrs?

noelle_lipschutz_3F

Amazon! Also Dr. Lavelle emailed us a link to good webcams!

noelle_lipschutz_3F

Hi there,

I was wondering if there are some students on campus taking 14A this quarter. Maybe we can do Zoom sessions and social distanced study groups here @ UCLA! Please reply if interested.

noelle_lipschutz_3F

Thank you so much! And when we calculate molar mass, we are determining the mass based on the size of the atoms of an element?

noelle_lipschutz_3F

I have a question for the Sapling Week 1 hw. For problem #10, 2-butanone was in the problem. We were given the structure and name. How do you find the molar mass given these two pieces of info?

noelle_lipschutz_3F

I also found it helpful to reload the page when you are on CCLE and another tab opens. This worked for me for Launch Pad as well for the 7 series.

noelle_lipschutz_3F

How many students are in a Step Up session?

noelle_lipschutz_3F

Can someone explain what a mole is. I still am having a hard time grasping this number.

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