CHEMISTRY COMMUNITY

Jazmin 1H

Florence-1F wrote:So does that mean that 250 up to 350 = C-?

yes, that is what someone said above.

Jazmin 1H

To avoid getting a different answer, you should not round or alter significant figures until you complete the problem that you are doing!

Jazmin 1H

Although significant figures did not matter on the first test, I'm pretty sure we are expected to be exact with our significant figures, just as we were on the midterm because it is something that we were taught in class.

Jazmin 1H

I am also having some trouble with pi and sigma bonds, but I found these two videos that helped me have a better understanding. I hope they help! https://www.youtube.com/watch?v=ree49ge4VA4&feature=youtu.be
https://www.youtube.com/watch?v=pT8nrBrTOm4

Jazmin 1H

I believe that the 2 came from balancing the equation; if there weren't a 2 next to OH, it would not be balanced correctly.

Jazmin 1H

Should we focus on the new material or the old material more? Which one will be more heavily concentrated on the exam? I would assume that new material would be more heavily concentrated since we were already tested on old material, but as others have said, it may be a mix of questions, as it is cu...

Jazmin 1H

I think that the final will cover everything we have learned in chemistry because it is cumulative.

Jazmin 1H

When I read this on the syllabus, I interpreted it as: if you get a 50% to less than 70%, it will be treated as if you got a C-. Because of this, I think 250 points does mean that you are guaranteed a C-, but I may have interpreted incorrectly.

Jazmin 1H

Dear Dr. Lavelle, I appreciate all of the effort you put into helping all of your students succeed--all the resources that you provide truly do help. Also, your enthusiasm for teaching chemistry made me excited to go to class every time, even though chemistry can be tough sometimes. Thank you so muc...

Jazmin 1H

I don't think we will have to draw coordination compounds, but I'm pretty sure we should be able to know them!

Jazmin 1H

I do not think we have to memorize it, as it is a constant, so it will most likely be provided for us.

Jazmin 1H

I don't think that there is an exact numerical cutoff, but the wavelength can not be extremely small because then it will not be able to be detected. For example, a wavelength of 1 x 10 -34 would be too small. I agree with the previous response that 1 x 10 -18 would be the smallest wavelength that c...

Jazmin 1H

I am confused about this too. In my notes, I wrote that chelate is a complex containing a ligand that forms a ring of atoms with a central metal atom, but I do not really understand what that means.

Jazmin 1H

I think that mono-, bi-, tri-, and hexo- dentates are just the names of the ligands that have a certain amount of electron pairs. For example, mono dentate ligands only have one electron pair to donate. Bi dentate ligands have two electron pairs, tri dentates have three electron pairs, and hexo dent...

Jazmin 1H

I believe the lewis structure should look like this.

Jazmin 1H

I believe that you'd have to look at the formal charge to decide which to add; if the lewis structure has a lower formal charge with a double bond,then that should be added, and vice versa. I hope that helped!

Jazmin 1H

Hydrogen has a charge of +1, as it says on the periodic table.

Jazmin 1H

I am confused as to why there are exceptions for these elements as well. I would appreciate if someone explained this!

Jazmin 1H

Hi, on Friday, we were told that one structure would be sufficient unless we are specifically asked to give all the possible resonance structures. For your last question, I believe that it would be two different types of questions. I hope that helps!

Jazmin 1H

You're right, hydrogen can only have one electron, but in the s-orbital, you can have a two electrons. If you do electron configurations using the periodic table, you can see that the s-orbital, which is the first two columns, allows for a total of two electrons. I attached a picture to help visuali...

Jazmin 1H

To add on to that, you can use Ar because its outer shell, along with the outer shells of the other noble gases, is full, which makes it easier to have Ar as the reference point. Hopefully that helps!

Jazmin 1H

I took the test today, and we were not provided with the wavelengths. You should have a general idea of the sizes though--for example, x-rays<UV<visible light<infrared<microwaves. The front of the test only has constants and equations, as it did for the previous test.

Jazmin 1H

You do not have to worry about memorizing the conversion because it is given on the front of the test.

Jazmin 1H

Zuri Smith 1A wrote:Okay thank you! And just to reconfirm, the limiting reagent is basically just the reactant that has the smallest # of moles (and thus runs out the quickest)?

I would say that you are correct about the limiting reactant.

Jazmin 1H

I am not sure about your first question, but for your second question, I would say that we have to remember what series matches with what radiation. I think Dr. Lavelle said that for tests, he'll give us constants and equations, but not that.

CHEMISTRY COMMUNITY

Search found 25 matches

Re: Grading question

Re: Calculations

Re: Sig Figs for Final

Re: pi bonds and sigma bonds [ENDORSED]

Re: equation

Re: Final [ENDORSED]

Re: Final [ENDORSED]

Re: Grading question

Re: Saying Thank You to Dr. Lavelle

Re: Drawing coordination compounds

Re: Memorization

Re: Wave-like Properties of Electron

Re: Chelate

Re: Ligand terms

Re: homework problem 4.35 part c

Re: When to use lone pairs or bonds

Re: 3.25 c)

Re: Exceptions [ENDORSED]

Re: Resonance Structure Problems

Re: 2.25 [ENDORSED]

Re: orbitals

Re: Information Provided on Exam

Re: converting from keV to joules

Re: Question from test 1 [ENDORSED]

Re: Remembering hydrogen spectral series and associated radiation