CHEMISTRY COMMUNITY

Allen Chen 1J

Any elements with unfilled d orbitals can have expanded octet.

Allen Chen 1J

The bond angles without lone pairs need to be accurate but as you add lone pair repulsion it becomes impossible to know exact angle so you can only say less than x degrees. I think

Allen Chen 1J

I believe the conjugate acid and bases are on opposite sides of the reaction, as the conjugate acid becomes the conjugate base and vice versa

Allen Chen 1J

WHy do ligands have to have atleast one lone pair?

Allen Chen 1J

From my understanding, tetrahedral is 3D while square planar is only 2D

Allen Chen 1J

Thanks for the wonderful video! It was very helpful and informative and really explained what coordination compounds are.

Allen Chen 1J

How does whether it is a cation or anion affect polarizing power?

Allen Chen 1J

Since it is relative, Do all covalent bonds exhibit some degree of polar nature even if difference in electronegativity is below .4? And if so, do they have dipoles still(just negligible)

Allen Chen 1J

So far, we've went over atomic radius, ionic radius, ionic energy and electron affinity.

Allen Chen 1J

The formal charge is the # of valence electrons – # of lone pair electrons – (1/2)(# of bonded electrons

Allen Chen 1J

I believe, the larger a cation/anion is the more polarizable it is, and the less polarizing power it has

Allen Chen 1J

I think you're thinking of electron affinity bc it is actually how much an element wants an electron, so maybe that will clear things up

Allen Chen 1J

It is just a grey area where we are even more uncertain whether the bond has covalent or ionic character

Allen Chen 1J

The octet rule is the general rule where elements before the d orbital want 8 electrons

Allen Chen 1J

Since Boron "wants" 3 electrons when doing formal charge, and you only count 1 from each bond, boron needs 3 bonds to be the most stable.

Allen Chen 1J

The octet rule just refers to the atoms wanting 8 electrons in order to become stable, but there are many exceptions to this rule when you reach the d orbital, or the 3rd row.

Allen Chen 1J

I believe that since the 1.5 and 2 parameters are merely rough guidelines with uncertainty, then the region in between just has greater uncertainty

Allen Chen 1J

Only 2 electrons can fit in a single orbital, and they cannot both have the same spin

Allen Chen 1J

Electrons and Photons have a 1-1 ratio so it would also be 1000

Allen Chen 1J

Taizha 1C wrote:Has anyone found any other resources outside of class that is useful for preparing for the test? Like any practice exam/test problems?

Looking at the tests from fall quarter as extra practice can be really useful

Allen Chen 1J

yazminedesan1F wrote:
Jocelyn1B wrote:How do you balance your other classes while still studying for chemistry?

I try to go to the peer review sessions before each test.

Allen Chen 1J

I feel as though reading the textbook is not necessarily necessary, but I do find how it works through example problems helpful in particular.

Allen Chen 1J

Yes, compared to part a, part b is just a few extra steps in the beginning; you just need to convert the mg to mols, then to atoms.

Allen Chen 1J

When the energy of the photon is equal or greater than the threshold energy, then an electron can be ejected. By increasing intensity, you are increasing photons, so if and only if we can meet the threshold energy can increasing intensity result in more electrons being ejected.

Allen Chen 1J

The De Broglie equation is just another way of calculating wavelength, but there are also other ways.

Allen Chen 1J

Since the more exact value is 15.9994, 16.00 is actually closer to it than 15.99

Allen Chen 1J

Does a solution of .5 M have a greater amount of solvent than a solution of .6 M?

Allen Chen 1J

If that was the exact value, then rounding up wouldn't be considered wrong since 7 is above or equal to 5 and therefore is rounded up

Allen Chen 1J

There are also many other variables such as T is temperature in kelvins

Allen Chen 1J

Chem_Mod wrote:Accuracy is on target. Precision is how closely you can repeatedly measure a thing.

What is the chemistry context in which these differences will be most important?

Allen Chen 1J

Could someone explain in more detail the "comparing" part of these steps? I do not understand what you do after you have the two different ratios, how do you compare them to know which is your limiting reagent? Here is an example: 2Na+Cl2 = 2NaCl. If 8 g of Na reacts with 8 g of Cl2: you ...

CHEMISTRY COMMUNITY

Search found 31 matches

Re: expanded octet

Re: Drawing Lewis Structures on the Final Exam

Re: Conjugate Acids/Bases

Ligands

Re: Tetrahedral and Square planar

Re: Coordination compounds

Polarizing power

Dipoles [ENDORSED]

Re: Trends? [ENDORSED]

Re: Formal charge?

Re: Polarization

Re: Electron affinity [ENDORSED]

Re: Bonds between 1.5 and 2 [ENDORSED]

Re: Octet rule

Re: in class example bf^3 [ENDORSED]

Re: OCTET RULE [ENDORSED]

Re: Electronegativity

Re: Clarification on Spin Quantum Number

Re: Test 2 final question [ENDORSED]

Re: Reading the textbook

Re: Reading the textbook

Re: Reading the textbook

Re: 1.25 part B

Re: Significance of intensity [ENDORSED]

Re: Wavelength and De Broglie Equation [ENDORSED]

Re: Which mass of oxygen should be used? [ENDORSED]

Molarity [ENDORSED]

Re: Rounding: when and where?

Re: Variables

Re: Accuracy vs Precision

Re: Limiting Reactant