CHEMISTRY COMMUNITY

ShreyaKannan1B

Someone threw sodium chloride at me.
I yelled, “That’s a salt!”

ShreyaKannan1B

What should you do if no one laughs at your chemistry jokes?
Keep telling them until you get a reaction.

ShreyaKannan1B

I tried writing jokes about the periodic table…
…but I realized I wasn’t quite in my element.

ShreyaKannan1B

There was a question on the final in this section I think that asked what kind of compound some molecules were, what was it asking exactly?

ShreyaKannan1B

Nare Arakelian Dis 3E wrote:I have been wondering this too. All I know is 250/500 is considered a C- and then I think he is just gonna wait to see how the final average comes out and figure out the curve then

Is it true that only people with a c or lower get affected by the curve?

ShreyaKannan1B

Savannah Mance 3B wrote:I think I have the concepts down pretty well from lecture and I do all of the homework problems. But, when I take the tests I kind of blank and I think it's because I get kind of nervous. Does anyone have any advice for that?

Don't drink too much coffee beforehand. Plus do practice problems.

ShreyaKannan1B

Coordination compounds form when neutral molecules or atoms (or anions) supply a central cation (usually a Tx metal) with an electron pair to form a coordinate covalent bond. These often form when Tx metals in solution first form complexes with water as the ligands, which are then replaced by more ...

ShreyaKannan1B

The final exam is cumulative.

ShreyaKannan1B

check out page 723 of the textbook!! but naming goes: [greek prefix; ligand name(s, in alphabetical order); transition metal cation; Roman numeral] the brackets represent coordination sphere the greek prefix (di, tri, tetra, penta) refers ti how many of the ligand there is the ligands have the endi...

ShreyaKannan1B

Is the coordination number just the number of bonds on the central atom?

ShreyaKannan1B

What does it mean when it's a chelating ligand?

ShreyaKannan1B

Aside from the textbook problems and online video modules, I would recommend doing to the Step-Up sessions and the upcoming midterm review sessions if you feel that you study well with others around; it would be a good way to clarify and reinforce concepts. The online modules stopped at a certain p...

ShreyaKannan1B

The geometry of a molecule determines its hybridization. A molecule with 3 bonded atoms and one lone pair has tetrahedral geometry since it has 4 regions of electron density. This is why the molecule has a hybridization of sp 3 even though the molecule only has three bonding regions. Thanks, I was ...

ShreyaKannan1B

Can I just count the bonds on an atom and determine the hybridization by making sure the exponents of the s and p add up to that number? I feel like that's what I did in high school, don't remember exactly though.

ShreyaKannan1B

Cassandra_1K wrote:Does anyone have any advice for remembering molecular shape?

I memorized the AX formula that went along with the shape.

ShreyaKannan1B

What does knowing the oxidation numbers tell you?

ShreyaKannan1B

What's the trend for polarizability?

ShreyaKannan1B

605357751 wrote:Can someone tell me which section of hw problems will be on the test please.

I think it's 3F, 2E, 2F

ShreyaKannan1B

What do equatorial and axial mean?

ShreyaKannan1B

Kendra Barreras 3E wrote:I believe Lavelle said in lecture on Friday that hybridization wouldn't be on the test.

Yeah it's not on the test but sigma and pi bonds will be on there I think.

ShreyaKannan1B

TimVintsDis3C wrote:I would do the online modules and go through the problems assigned for homework. I believe all of the questions will be taken from there, so it's almost like an exact study guide.

Yeah this is probably the best way to study/learn material.

ShreyaKannan1B

At the test bank do they only give you five minutes to find what you're looking for?

ShreyaKannan1B

Which elements does hydrogen form hydrogen bonds with?

ShreyaKannan1B

What do you do if the electronegative difference is between 1.5 and 2?

ShreyaKannan1B

How can you tell if a certain molecule is a solid, liquid, gas, or aqueous? I think Prof Lavelle went over it in a lecture but I didn't understand and know that it's related to bonding, if someone could just clarify?

ShreyaKannan1B

Follow Prof Lavelle's instructions from his lecture ppt and from there it's just practicing getting fast with identifying formal charges.

ShreyaKannan1B

What's the difference between Heisenberg Uncertainty Principle and Shrodinger's? Is it cause Shrodinger deals with the wave function?

ShreyaKannan1B

Due to the fact that orbitals act as waves, a wave function is a mathematical function that shows the wave-like behavior of electron(s) in an atom and the probable location to finding an electron in a specific region around the nucleus of an atom. Thanks! Shrodinger's eqn has a chance of being on t...

ShreyaKannan1B

Threshold energy and ionization energy both have to do with the minimum energy required to remove an electron from an element but threshold energy refers to the energy needed to remove an electron from a metal (photoelectric effect) while ionization energy has to do with the energy needed to remove...

ShreyaKannan1B

Camille 4I wrote:Where did you get the number 4.200x10^-19 from?

Yeah I don't get that either.

ShreyaKannan1B

TimVintsDis3C wrote:Are all of these equations meant to be memorized, or will they be provided on tests?

Rydberg's constant is provided, but the eqn isn't. However, I think you can use E(lowercase n) = -hR/n^2 which is on the constants sheet.

ShreyaKannan1B

Thanks for the advice! Any tips for the midterm?

ShreyaKannan1B

Can someone explain why Cr and Cu are exceptions?

ShreyaKannan1B

Is there any problem where you would use Rydberg with another equation?

ShreyaKannan1B

Find a lounge with a white board and work things out on there, it really helps to have everything larger and in front of you.

ShreyaKannan1B

Can someone put all the formulas that are related to each other in one post?

ShreyaKannan1B

The online modules are pretty helpful, especially taking the post-assessment. The videos aren't too in depth about the harder questions but they cover the basics really well which helps.

ShreyaKannan1B

At least look at all of the questions and their answers if you know you won't have time to physically do them all, because then at least you have some idea of what the test questions could look like.

ShreyaKannan1B

Thanks for the advice, because I'm not sure about the pre-med track so it's nice to hear from someone who has been through it.

ShreyaKannan1B

Find a study room with a white board and find some people who are also in the class so you can talk it through and draw it out on the board, that's what helps me.

ShreyaKannan1B

Make a study group because it really helps to talk things out with others, especially the theoretical stuff we're doing right now with quantum numbers.

ShreyaKannan1B

What is the difference between absorption line and emission line spectrum?

ShreyaKannan1B

What is the experimental setup for a spectroscopic experiment?

ShreyaKannan1B

Do we get all of the equations given to us on the next test?

ShreyaKannan1B

Can someone clarify number 19?

ShreyaKannan1B

Why does the experiment have to happen in a vacuum?

ShreyaKannan1B

For these kinds of questions (like from section G), is it mainly just knowing how to manipulate the mv = mv equation?

ShreyaKannan1B

I’m confused as to how to even start this question, I don’t think I’m understanding it correctly, is there any way for someone to explain it in easier terms?

ShreyaKannan1B

I wrote out the dimensional analysis as 5.15g / 246.37g*mol^-1 * 11 mol oxygen * 6.022e23 which I'm pretty sure is the correct way (maybe not?), but when I put it into my calculator it ends up being around 86 instead of 1.38e23 (I got this answer on my calc once but I don't know how). Am I just doin...

ShreyaKannan1B

Why do I have to multiply by the .100 L that is added to the diluted solution?

ShreyaKannan1B

I was having trouble balancing the second part of H11, where the Fe2O3 reacts with carbon monoxide to make iron and carbon dioxide, can someone tell me how it's supposed to be done?

Search found 51 matches