CHEMISTRY COMMUNITY

chrisdinkel_4E

Can someone please explain to me the relationship between Internal Energy (U) and Enthalpy (H)

chrisdinkel_4E

I'm assuming we have to know the concept behind the integral equations (for example the reversible isothermal reaction), but will we need to know how to use it in mathematical practice?

chrisdinkel_4E

why does Li+ have more polarizing power than Mg^2+ even though Mg^2+ has a stronger positive charge?
Why is Br- more polarizable than P^3- for the same logic??

chrisdinkel_4E

Do we need to know which atom in the ligand is attached to the central atom? For example, do we need to write out -kE (E being the attached atom) when writing the formula name out?

chrisdinkel_4E

Should we memorize all of the strong acids/bases by name? Or are they going to give us the molecular formula?
I can just imagine an easy question that could be asked but not knowing the formula for the acid messes everything up

chrisdinkel_4E

I understand the electron/proton acceptor/donor concept, but how can you tell if a molecule is a Lewis acid/base or Bronsted acid/base?
Examples would be much appreciated

chrisdinkel_4E

in the equation CH3COOH + NH3 ---> CH3CONH2 + H2O
Why is this not a proton transfer?
It seems to me that the H+ proton from the NH3 combines with the OH from the compound, no?

chrisdinkel_4E

Is it expected that we know the Latin names, like Ferrum (Fe) for example

chrisdinkel_4E

sheesh I ain't ready

chrisdinkel_4E

We fr need to memorize all those names???

chrisdinkel_4E

how can we know if the dipole moment is strong enough for the molecule to be considered "polar"?

chrisdinkel_4E

VSPER? I hardly know her!!

chrisdinkel_4E

SO2 has a bent shape because of the lone pair. Because the electronegativities are different between S and O, there is said to be a dipole moment with the O's being negative and the S being positive.

Where does the Lone Pair come into play though? why doesn't the lone pair cancel S's positive charge?

chrisdinkel_4E

When replacing an atom with a lone pair (molecule with 3 bonds and 2 electron pairs), why do you take away from the equatorial atoms and not the axial atoms?

chrisdinkel_4E

do we have to determine relative Electronegativites by periodic trends or is it given?

chrisdinkel_4E

How do radicals influence hybridization of an atom?

chrisdinkel_4E

Why can group 13 elements have incomplete octets?

chrisdinkel_4E

12b) Draw the lowest energy Lewis structure for ClO4- Why is the lowest energy Lewis structure have one of the three Oxygen atoms with 6 lone pairs instead of doing a double bond with Cl and 4 lone pairs like the rest of the oxygen atoms? The formal charges are the same, either Cl has -1 or the O h...

chrisdinkel_4E

Olivia L 3D wrote:For question 12c, why is it better to have a triple bond with the two nitrogen atoms instead of double bonds on nitrogen and oxygen? The charge is both the same.

It is better to have a triple bond as opposed to a double bond because Oxygen is the more electronegative atom.

chrisdinkel_4E

For question 13A, can someone please explain why the answer is 2.681x10^-26? I got the 2.681, but for some reason I got x10^-23.

chrisdinkel_4E

this question covers the rydberg equation. in the solution, it assumes that n(final) is 1 and uses that assumption to find that n(initial) is 3.
Can someone explain if this assumption is always valid? Thanks

chrisdinkel_4E

Ahh thanks!

chrisdinkel_4E

Is this formula basically only used to prove why electrons cannot exist directly on the nucleus because their velocity would be higher than the speed of light?

chrisdinkel_4E

I am confused by if two different atom have the same valence (i.e. one atom gain/lost an electron) why they wouldn't have the same structural size.
It makes sense that they would have very different properties.

chrisdinkel_4E

For test 2 specifically, is it relevant to memorize the electromagnetic spectrum?
As in, the nm boundaries for the wavelengths of light

chrisdinkel_4E

So, say for Ca, the quantum numbers would be:
n=4 (4th row)
l=0 (s block)
ml=0 (s block)
ms= -1/2 (2nd one of the s block)

chrisdinkel_4E

Can someone please explain how to find these quantum numbers?

chrisdinkel_4E

We will always be given equations and constants for the exams, midterm, and final.

chrisdinkel_4E

The orbitals are also relevant with energy levels. For example, s-electrons have a lower energy state than p-electrons in the same shell.
Within the shell, the order is s<p<d<f.

chrisdinkel_4E

Throughout the course, I have just been writing down everything that is on the powerpoint slides and some extra clarification notes from how he explains the concepts. This strategy will probably not work out well in the end because I have no idea to do the homework problems!

chrisdinkel_4E

Yes, all relevant constants will be given as well.

chrisdinkel_4E

Is mass percent composition simply the percent of each atom in a molecule based on the molar mass of each atom?

chrisdinkel_4E

We can choose to do problems from chemistry review and/or from the quantum world, correct?

CHEMISTRY COMMUNITY

Search found 33 matches

Internal Energy and Enthalpy

Integrals

Polarizing Power and Polarizability

Do we need to know which atom in the ligand is attached to the central atom?

Memorizing Acids by name

How to tell the difference between Lewis + Bronsted

Why is this not a proton transfer. (7th ed. 6A.9)

Latin Names

Re: Naming

Naming

Dipole Moments signifying polarity

Re: Post All Chemistry Jokes Here

SO2

Trigonal Bipyramidal

Electronegativity

hybridization and radicals

EXPANDED OCTET

Re: Garlic Bread Review 12b

Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]

Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]

Chapter 1.15 6th Edition

Re: Isoelectronic Atoms

Heisenberg Indeterminacy Equation

Isoelectronic Atoms

Electromagnetic Spectrum

Re: Help on how to find l, ml, and ms

Help on how to find l, ml, and ms

Re: Exam 2

Re: Atomic Orbitals

Re: Note Taking

Re: Equations

Mass percent composition [ENDORSED]

Homework Week 2