CHEMISTRY COMMUNITY

AntonioZarich2E

Does the temperature ever change our answer in questions where we have to find the pH, or is it just kinda there?

AntonioZarich2E

Blake Ballew 1E wrote:Are we expected to know stereochemistry for the final?

I haven't seen stereochemistry on any of the review documents, so I don't think that we will need to know it.

AntonioZarich2E

The ligands go in alphabetical order, but the prefixes do not determine the order, they just go in front of the ligands.

AntonioZarich2E

Ligands always donate their electron pairs and are Lewis bases. They usually bind to the central atom and are transition metals.

AntonioZarich2E

Yes, the lower the pH the greater the strength of the acid. The higher the base, the greater the strength of the base.

AntonioZarich2E

Definitely need to memorize the periodic trends, bond angles, and VESPR. I believe we still have the formula sheet for most of the other stuff.

AntonioZarich2E

Count the atoms connected to the atom that you are finding the hybridization of and add that to the number of lone pairs. After finding that number, use the rules, 2=sp, 3=sp2, etc.

AntonioZarich2E

To find the number of sigma bonds, find the total number of bond interactions. To find the number of pi bonds, count the number of double and triple bonds, 1 for double bonds and two for triple.

AntonioZarich2E

It seems like multiple carbons can form a ring structure, as we have seen multiple examples of that in the lectures, but other than that, I can't say.

AntonioZarich2E

Axial atoms are generally 180 degrees apart, and are on the same plane as the central atom. Equatorial atoms will be the other atoms.

AntonioZarich2E

I'm having a hard time remembering which atoms can have the expanded valence shell when drawing lewis structures. Is there an easy tip that I can use?

AntonioZarich2E

We haven't covered it so far, and I don't see it on the syllabus, so I assume that we will not need to know it in this class.

AntonioZarich2E

Polarizability is basically how difficult it is to distort an electron by pulling apart its shape. London Dispersion forces can change the shapes of molecules by stretching the electron structure of the atoms.

AntonioZarich2E

I believe the electron will be taken from the outermost orbital as that would require less energy than the others.

AntonioZarich2E

Is there a basic rule for whether being in a period or being in a group will change the ionization energy/atomic radius/electronegativity? In short, does going down or across make a bigger difference?

AntonioZarich2E

Dipole-Dipole bonds are formed when each is a polar molecule, independent of the other one.

AntonioZarich2E

It has to be HF because F is the only element out of the options that can bond with hydrogen.

AntonioZarich2E

I don't think that F2 would be able to form a hydrogen bond because it isn't polar, although in the second instance it seems like it would.

AntonioZarich2E

We aren't allowed to annotate our periodic table before the test, but I usually write a annotate one before, and then after the test starts write everything on the page so I don't forget.

AntonioZarich2E

The syllabus says that it is the same number of time as the first midterm.

AntonioZarich2E

Bond length is determined by size and electronegativity. Hydrogen is smaller than O, so the N-H bond will be shorter than the N-O bond.

AntonioZarich2E

Lewis acids are cations and Lewis bases are anions.

AntonioZarich2E

I think you would start by adding the two electrons from the electron configurations given and using the periodic table.

AntonioZarich2E

It seems like there is no way to know for sure, but the models are a good way for us to work around this.

AntonioZarich2E

I usually just go for a walk with my dog and listen to music.

AntonioZarich2E

When I have to really cram for something, I make sure that I am cold and sitting in an uncomfortable spot. It makes me want to study efficiently and makes sure I don't get drowsy.

AntonioZarich2E

With isoelectric ions, the ion with the smallest nuclear charge will have the biggest radius.

AntonioZarich2E

If you're looking for dramas, I've really gotten into All American, Breaking Bad, and Money Heist.

AntonioZarich2E

Is there an easy way to find out if an anion of an element would be bigger than a cation of a different element, if the natural atom of the element corresponding to the anion is smaller than that of the cation?

AntonioZarich2E

Oxygen needs 4 electrons to fill up its shell, while the other two just need 3.

AntonioZarich2E

Is it strictly 5 posts per week in terms of the participation points or is it a total of 50 at the end of the quarter?

AntonioZarich2E

alebenavides wrote:Does anyone know when we get our access code? I bought the book a few days ago but haven't received it so I had to get the free 10 day trial.

I got my access code for sapling in the mail a week or so after buying the book, but haven't gotten a code for the online book yet.

AntonioZarich2E

Kennedi2J wrote:Does anyone know if Sapling is mandatory?

Sapling is listed on the syllabus as worth 5 points per week, so if by mandatory you mean graded, I think it is.

AntonioZarich2E

The step-up sessions are pretty helpful and I've found the material a little bit easier to understand, but if you don't have trouble with the topics in the bookwork problems, you will probably be fine.

AntonioZarich2E

I make this mistake a lot, in this type of problem, you have to start by changing the MHz to Hz, otherwise your conversions will be off later.

AntonioZarich2E

In Debroglie's equation, the mass is in kilograms (kg) and the velocity is in meters per second (m/s).

AntonioZarich2E

I've found the most success when I start with the one that appears in the formula the least and then work my way up. If the equation is especially difficult, I'll make a table with the amount of products and reactants on either side and keep track of it that way.

AntonioZarich2E

I generally leave the numbers as they are on the periodic table in my calculator, and then round to the hundredths in the answer. This worked for the Sapling homework.

AntonioZarich2E

One thing I'm still not really sure of is how many zeros after a sig fig on the right side of the decimal point are sig figs. For example, if I was to determine asked for 0.320 and 0.3200, would they both have three sig figs?

AntonioZarich2E

I was also, a little confused on the difference between the electric and magnetic fields. The main difference that I found online is that a magnetic field is caused by moving electrical charges, while the electrical fields are caused by stationary charges.

AntonioZarich2E

In general, are we supposed to round or truncate, and to how many places if it is not specified in the question?

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