CHEMISTRY COMMUNITY

Briana Perez 3A

I believe that they will be accepting both answers because they don't expect us to be able to tell the difference with what we have learned.

Briana Perez 3A

Lavelle said that both will be accepted. One is just an older way to name while so since the change happened recently, they will be fine with either one.

Briana Perez 3A

I am wondering the same thing something similar, as I have heard two different opinions. I have heard that we do need to memorize all the ligand names but I have also heard that we can simply work out the Lewis Structure and find the charge on the test. Does anyone know which is preferred?

Briana Perez 3A

I believe we will get out Test 3 back this week so that we can look over it before the final. The TA's are also usually pretty fast at grading them and getting them back to us in time.

Briana Perez 3A

Rather than acting as simply a base or simply an acid, an amphoteric compound can act as both. Water is a prime example of this.

Briana Perez 3A

Determine which are basic, acidic, or amphoteric.. a. BaO b. SO3 c: As2O3 d: Bi2O3 For these problems, would it help to draw out the Lewis structures? Or do you simply follow the rules stating that metals form basic oxides, nonmetals form acidic oxides, and the diagonal bar forms amphoteric? Can som...

Briana Perez 3A

When a molecule has a dipole - dipole moment it means that it is polar. In order to find this out, you must draw the Lewis structure.

Briana Perez 3A

Also, I believe only the cis molecules work in regards to chemotherapy because unlike trans, it can shut down and block the cancer in two places.

Briana Perez 3A

When the shape is linear, sometimes the repulsion of the lone pairs will cancel out and therefore not influence the direction of the atoms. In this case, we do not know if there are lone pairs or not because they could be there but just canceled out.

Briana Perez 3A

When finding the dipole moment, I was wondering if the arrow should point toward the more electronegative atom or towards the less electronegative atom? I believe in the past it was pointed toward the less, and now it is the other way. But I just want to clarify! Thanks

Briana Perez 3A

I haven't heard an exact answer yet. But I agree, I think we will have to draw the Aufbau diagram and from that just write which bonds are sigma and which bonds are pi.

Briana Perez 3A

The bold and dashed lines are just a better way to represent a 3D figure. The bold line means that the element is coming forward while the dashed line means that it is towards the back. This is easy to remember because when something is closer is it more prominent, therefore bold and as it gets fart...

Briana Perez 3A

I believe that all discussions are still in session unless otherwise cancelled by your TA. I have a Tuesday discussion and I got a confirmation email the day before stating that we will still meet. However, homework is not due until week 9.

Briana Perez 3A

If I understand correctly, yes 250 points will allow you to pass the class. However I have heard from past students that he also adjusts the grading scale a little bit based on the average of the class, that is why there are so many A's in his classes on Bruinwalk.

Briana Perez 3A

I was also confused by this because a few I read that the lone pairs should be placed in the equatorial. But then on some of the answers in the solution manual, the lone pairs were on the axis... Can someone please explain this

Briana Perez 3A

Does anyone know if/when the midterm grades will be posted on MyUcla? I think it was mentioned by a few TA's that they would be in, but I'm not sure how soon before the quarter ends.

Briana Perez 3A

I am assuming that the review sessions today have been cancelled due to Veteran's day? Just wanted to clarify..

Briana Perez 3A

One quick and easy way to tell if an element is a radical is by counting the number of valence electrons. If it comes out to an odd number then one electron will be unpaired and will therefore be a radical. If it comes out to an even number then there will be no unpaired electrons and therefore is n...

Briana Perez 3A

It is an exception to the period table and just has to be memorized. Because the 3d orbital is so much larger than the 4s, it pulls one electron to fill its empty space and is therefore full. Essentially, it is more stable in this configuration.

Briana Perez 3A

Why do Gallium and Indium have equal electron affinities?
Why does Sulfur have a higher electron affinity than oxygen?

Briana Perez 3A

I am assuming that we will not need blue books because they have been printing everything for us. I think it is easier to use what they print so there are no transferring errors us as well as easier to for them to grade.

Briana Perez 3A

How do you determine the number of valence electrons in the d block? Does it have to be either one or two since?

Briana Perez 3A

Does anyone have an easy way to remember all the periodic trends that occur?
Please share if so!
Thanks

Briana Perez 3A

I suggest just knowing which series responds to which energy level and nature of light, for example either visible or ultraviolet but I do not think it is necessary to know much more beyond that.

Briana Perez 3A

The step up and workshop sessions are very helpful as well. Kahn Academy has videos online that cover all of the material discussed thus far in class and cover all the basics in a slow and detailed manner. Professor's videos on his website are also very helpful because you can pause and rewind as mu...

Briana Perez 3A

If I understand correctly, it is actually easier to remove the second electron. However there are cases when the second electron fills the orbital completely and therefore a higher ionization energy is needed in order to remove the electron.

Briana Perez 3A

Although I don't think Lavelle will directly ask which light corresponds to which frequency or wavelength, I think it is a good idea to have a general understanding of it. It will not only help make sense of the detailed problems, but will allow you to check your answer at the end to make sure it is...

Briana Perez 3A

After reading the syllabus I am a bit confused on the grading of this class. I did well on the first test, however just below average. So what does that mean in terms of how it will come out in the end? For example, since I did well is that all that matters or does the class average play a role on m...

Briana Perez 3A

I think that the two words are interchangeable, however; Lavelle prefers not to use uncertainty because it is often synonymous with "unpredictability and unreliability". Where as indeterminacy can be taken as simply "not precisely determined or fixed" which makes more sense for t...

Briana Perez 3A

It is necessary to have different equations because during Bohr's experiments, he was able to derive an equation that correctly predicted the various energy levels in the hydrogen atom (which has one electron) which then corresponded directly to the emission lines in the spectrum. However, it failed...

Briana Perez 3A

Professor Lavelle connected the word "work function" to "threshold energy" -- in other words, the minimum energy needed to eject an electron. In class he made an anology to a cross country team that was unable to jump a hurdle and therefore did not advance any further in the race...

Briana Perez 3A

I think that being able to solve the problems quickly and in time will come with doing lots of practice problems. I think that if you get toward the end of time and realize that you will not be able to finish, at least find the problems that you recognize and will be able to solve quickly in order t...

Briana Perez 3A

In a few practice problems there were names of certain compounds listed and we were expected to write them out. For example, 7th edition. Fundamental F #3 "Write the formula for nitric acid"

Are we going to be expected to name the compounds like this for the tests?

Briana Perez 3A

Will there ever be a case where your answer contains less sig figs than there should be? And if so do you add a decimal point and trailing zeros? Or will this never happen?

Briana Perez 3A

Edition 7. Fundamental G. #19 "A sample of 1.345 M K2SO4 of volume 12.56 mL is diluted to 250.0 mL. What is the molar concentration of K2SO4 in the diluted solution? I understand how to solve the problem by multiplying (1.345 mol L)(0.01256 L) / 0.2500 L. The answer comes out to be 0.06757 mol ...

CHEMISTRY COMMUNITY

Search found 35 matches

Re: Tetrahedral and Square Planar Complexes

Re: Chloro v/s chlorido

Re: Ligand Names

Re: Test 3

Re: Definition

7th Edition Q6A #1

Re: Intermolecular forces

Re: Cis and Trans

Re: Problem 2E # 1 7th edition

Dipole Moment

Re: For the Test

Re: Bold/Dashed Lines in Bonds

Re: Discussion

Re: Grades

Re: The difference between placing lone pairs in certain positions?

Posted Grades

Step Up Sessions

Re: Radicals

Re: Copper

Electron Affinity

Re: Blue Book Midterm

Valence Electrons in d orbital

Periodic Trends

Re: Balmer, Lyman, Paschen Series

Re: Quantum Test

Re: Removing 2nd Electron

Re: Expected to know?

Grades w/ Test Average

Re: Indeterminacy vs. Uncertainty?

Re: H-Atom and multi-electron atoms

Re: work function

Re: Test 1

Compound Names

Number of Sig Fig

Units on Fundamental G#19