CHEMISTRY COMMUNITY

Daniela Alvarado 3B

for #24, why can't we find the oxidation state of Fe by finding the nitrogen' formal charges while attached?

Thanks in advance!

Daniela Alvarado 3B

Question 12.17 on the hw states BaO is a Lewis acid. How do we come to that conclusion? Is it because in the lewis structure O has 2 lone pairs of e- ? If so, then is it safe to say that even when we have a neutral molecule, if it has lone pairs we consider it a base that donates e-?

Daniela Alvarado 3B

The solutions manual doesn't specify, so I was wondering if when they list the acids and bases, they're listing the conjugate acid-base pairs as
"ACID conjugate base, BASE conjugate acid?"

Daniela Alvarado 3B

I’m a bit confused as to if we need to know how to calculate the pH of a weak acid solution. I thought Professor Lavelle said we didn’t, but on the practice probs, box 12.1 is listed and that gives steps on how to find the pH of weak acid solution. Also, exactly what calculations from chapter 12 mus...

Daniela Alvarado 3B

can anyone explain why in part d. H2SO3 is an acid? and why in part e. Ca(OH)2 is a base? Thanks in advance.

Daniela Alvarado 3B

Earlier today someone some one told me that the coordination number was the number of DIFFERENT bonds which threw me off. But what I'm seeing here is that when we have 3 of the SAME atoms bound to a central atom, the coordination # is still 3, right?

Daniela Alvarado 3B

this is what if found online lol "Transition metals can have multiple oxidation states because of their electrons. The transition metals have several electrons with similar energies, so one or all of them can be removed, depending the circumstances. This results in different oxidation states.&q...

Daniela Alvarado 3B

I believe that if the molecule is polar then it has a higher boiling point than something that is non-polar. But when comparing 2 polar molecules' boiling points it is important to recognize what forces are present (hydrogen bonding, LFD, Dipole-dipole) and the one with more forces present has a hig...

Daniela Alvarado 3B

I have a question on part d for this problem. I drew the Lewis structure and placed two lone pairs on the O so that all atoms would have a formal charge of 0. As a result I thought the molecular shape would be bent do the repelling of the lone pairs; however, the solution manual says it’s linear. Wh...

Daniela Alvarado 3B

If we have for example XeF4 (ch. 3.65 6th ed), the formal charge on Xe is zero; however, when we’re looking at the bond pairs and lone pairs there’s 12 electrons around the Xe. Will the charge for atoms w expanded valence shells always be 0?

Daniela Alvarado 3B

Will Lavelle still have O.H. this Wednesday even though we don’t have class? Or are O.H. Cancelled too?

Daniela Alvarado 3B

Enzo_1I wrote:From what i understand it is necessary to know the shape that corresponds to the formula. This means memorizing which formulas are associated to which shape.

do you happen to know if theres anyway to know the corresponding shape aside form the AXE formula? or must we memorize those too?

Daniela Alvarado 3B

What is the relationship between shape and boiling point? Like I know if it's rod-shaped there's a stronger interaction because of the larger distance, but what does that have to do with its higher boiling point? the way I think of it is that when 2 rod shape molecules interact the shape allows the...

Daniela Alvarado 3B

when we draw all possible resonance structures are we required to draw the hybrid with the dashed lines? or is it okay to draw the double headed arrow between the different resonance structures?

Daniela Alvarado 3B

in class when Lavelle showed us the tetrahedral, why couldn't we put a bond at the bottom? how does putting the last bond pointing toward us affect the atom?

Daniela Alvarado 3B

how exactly do we draw these? do we add/ subtract valence electrons (based on the charge given in the chemical formula), and just add a bracket and charge? or is there something else we must do?

Daniela Alvarado 3B

Does the bond length change depending on where the double bond is in the resonance structures?

Daniela Alvarado 3B

Should we know what the chemical formula of a compound is just by looking at the name? For example knowing that potassium phosphate is K3PO4 (chapter 3 #29 6th edition?)

Daniela Alvarado 3B

WHERE IS LAST YEARS MIDTERM?...

Daniela Alvarado 3B

Can someone explain why C has a higher electron affinity than N in more detail plz? It’s confusing having said that N is closer to the right of the periodic table...

Daniela Alvarado 3B

Yeah I have a follow up question...looking at 2.39 6th edition, how can we tell if an electron configuration is in ground state or excited state?

Daniela Alvarado 3B

Since it’s 4p, we know p has 1 subshell (l=1), that subshell has 3 orbitals and all those orbitals will have the same energy level

Daniela Alvarado 3B

also, if I isn't specified its found by all the numbers until n-1

ex// If n=3 then I=0,1,2 (2 is the las one because n-1) and M subscript I= -I,i=I-1,I

Daniela Alvarado 3B

what exactly do the nodal planes help us figure out?

Daniela Alvarado 3B

fundamentals till week 5 Friday, I believe.

Daniela Alvarado 3B

How exactly does the model demonstrate that though? For example, is going from The first line on the left to one on the right an increase in N or something?

Daniela Alvarado 3B

are energy difference (delta E) & E subscript n used interchangeably? what exactly is E subscript n?

Daniela Alvarado 3B

Hello,
I turned in hw #2 last week in discussion and got it back today, however there’s no score on it...so how do I determine my score?

Daniela Alvarado 3B

can anybody explain the procedure for the 4th row ? plz I kept getting a couple digits off...

Daniela Alvarado 3B

In the worked example presented in lecture today when asked if the car has any measurable wave like properties, what exactly helps determine if the answer is yes or no after finding the wavelength?

Daniela Alvarado 3B

When trying to find the molecular formula & we put the molar mass of molecular formula over the mass of the empirical formula we found, is the number supposed to be a whole # or can it be like 1.23? If it can be 1.23, do we round when we multiply it by the subscript of the elements in empirical ...

Daniela Alvarado 3B

Most of the final answers I’ve seen are in scientific notation so I was thinking we actually might have to

Daniela Alvarado 3B

Hey i didn’t do that problem but I think u could check ur answer in the back of the book since it’s an odd #

Daniela Alvarado 3B

Yeah I believe if it’s off and multiplying it will make only make it off by less than .05 then that’s when you multiply it, but all 3 numbers have to be super close to a whole #

CHEMISTRY COMMUNITY

Search found 34 matches

Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]

BaO a Lewis acid ?

homework question 12.11

Calc pH

6th editions Fundamentals J #1

Re: Coordination Number

Re: Transition Metals

Re: Molecular shape in relation to polarity and boiling point

Re: 6th edition 4.13

Formal charge on atom w/ expanded valence shell

Lavelle office hours (week of thanksgiving break)

Re: AXE formula

Re: Shape and Boiling Point

Re: Bond Lengths

Re: Naming the shape

polyatomic ions

Re: Bond Lengths

3.39

Re: Midterm

Re: Electron Affinity

Re: Ground state

Re: degeneracy of the a 4p orbital

Re: Electron Configuration

Re: nodal planes for d-orbitals

Re: Midterm

Re: Series and Wavelengths

energy difference vs. E subscript n

Got my homework back no grade

Re: problem 1. 9 sixth edition

Measurable wave length properties

Going from empirical to Molecular formula

Re: Scientific Notation

Re: HW L1

Re: When to double moles