CHEMISTRY COMMUNITY

leediane0916

the lone pair counts as one electron density so you have to consider it!

leediane0916

I’m pretty sure Dr. Lavelle and the UAs have study and review sessions planned because my TA posted about one during dicussion on the board last week

leediane0916

i think he means using the AXE formula and determining the shape!

leediane0916

up to period 2 elements, the electrons can only fill s and p orbitals which is why they can only pair up to 8 electrons. but starting from period 3, there is a d orbital that goes beyond just the s and p orbital which is why if the first two subshells are full, electrons can fill the d subshell, cre...

leediane0916

although the single, double, triple bonds have different orders and strengths, they still represent one type of interaction between two atoms so it counts as one!

leediane0916

from what i've heard the final covers mostly from week 6 to the end but is still cumulative!

leediane0916

if we know what bond contains sigma/pi bonds, what are some usage of these bonds? like what can we calculate about the bond/molecule using the number of sigma and pi bonds?

leediane0916

when we try to determine the shape of a given molecule, do we also have to know the hybridization of it or can we just look at the bonded electrons and lone pairs and figure it out?

leediane0916

in our discussion our TA went over a total of 10? shapes and I think that's all we need to know

leediane0916

how do we use sigma/pi bonds to calculate bond order? (or bond length???)

leediane0916

the elements starting group 3 can contain more than 8 electrons because the d-orbital is added, meaning that more than 8 electrons can bind to these atoms!

leediane0916

the formal charges need to add up to the charge of the entire molecule but the most stable structure is the one where the most atoms contain a FC =0

leediane0916

what exactly is bond order? would we have to know it for the test?

leediane0916

how do you determine what is a lewis acid and what is a lewis base?

leediane0916

how exactly do we determine bond strength? for example trying to find if C2+ or C2 has a stronger bond?

leediane0916

in molecules like ONF, we know that we need a double bond and the central atom is N but how do we determine if that double bond should be made between O-N or O-F?

leediane0916

when we draw our lewis structures, does dr lavelle want us to indicate that triple double single bonds have different bond lengths or can they all just be the same length?

leediane0916

yesterday in class dr lavelle drew the SO4 2- atom's lewis structure and said that it is most accurate when the central atom (s) has two double bonds and two single bonds, which represents 12 electrons - how does that work?

leediane0916

where can we find where we take our midterm next monday? is it in cs24?

leediane0916

so when we draw the lewis structures the central atom is the one with the least electronegativity? if so, is there a specific reason?

leediane0916

can someone define the effective nuclear charge and how it affects electron affinity and/or electronegativity?

leediane0916

When problems ask you if your object (ie. car) has measurable wavelike properties, what it is asking me to identify/decide?

leediane0916

you decide how many electrons to remove depending on the charge on the cation!

leediane0916

the E resulting from this equation should be negative because you are going from a higher E level to a lower E level, during which E is given off as light, so the loss of E as photons are expressed through the negative sign

leediane0916

I think we just need to know the specific range for visible light, and just the order in which the categories range along the spectrum!

leediane0916

in these problems the actual yield should be given (because you can't conduct the experiment by yourself and figure that value out) and the theoretical yield is the amount of the product that you deduce from the given equation!

leediane0916

If the units are specified in the question, you should use that unit but otherwise, I think Professor said you could do either!

leediane0916

Threshold Energy is the minimum required amount of E that a photon should contain for the photon to release an electron from the metal surface. The threshold E + E of the electron is equal to the E of the photon. As explained in the lecture, if the electron's E is 0, that means that the photon's E w...

leediane0916

When I solve problems I don’t round until the very end and keep all my sigfigs but sometimes the answer I get is 0.01-0.02 digits different from the one in the solution manual. Will this be a big problem on the homework/test?

leediane0916

I think if the question starts off with 3 sigfigs you need to include the . at the end of 400 (400.) to make it 3 sigfigs and follow the rules!

leediane0916

I do know that it is easier and less confusing if we write down and cancel out all of our units when calculating with dimensional analysis but does this also apply to when we're using the Avogadros number or any other dimension in the future that contains complicated units?

CHEMISTRY COMMUNITY

Search found 31 matches

Re: lone pairs

Re: Final [ENDORSED]

Re: VSEPR Model

Re: Octet Expansion

Re: e- Density

Re: Final Exam

usage of sigma/pi

hybridization for VSEPR

Re: Test 3

sigma/pi bonds and bond order

Re: Octet

Re: Formal Charge & Stable lewis structures

bond order

lewis acid/base

determining bond strength

determining double bonds

bond length

central atoms with more than 4 bonds

midterm

electronegativity in lewis structures

effective nuclear charge

wavelike properties

Re: Electron Configuration of Cations

Re: Negative Signs

Re: Expected to know?

Re: Percent Yield [ENDORSED]

Re: Changing Units

Re: Threshold Energy

answer accuracy

Re: Sig Figs

units during dimensional analysis