CHEMISTRY COMMUNITY

Nienjou Claire 1E

would you just have to know which bonds/molecules would produce a charge or is there a way to tell by looking at the structure?

Nienjou Claire 1E

A ligand is basically the atom that binds to the central atom in a coordinate compound.

Nienjou Claire 1E

I'm not quite sure of what you are asking for, but I'll write down my notes from what Professor Lavelle said in class. The bonds basically hold the atoms in a coordinate compound together. Sigma bonds: 2 orbitals, each with 1 electron; interact end-to-end to form 1 sigma-bond; allow bound atoms to r...

Nienjou Claire 1E

Can someone explain how to draw a Lewis structure of an element from the d-block?

Nienjou Claire 1E

I have many chemistry jokes, but I'm afraid they won't get a good reaction.

Nienjou Claire 1E

A coordination compound basically consists of a central atom with ligands attached to it by covalent bonds

Nienjou Claire 1E

I'm not sure if this is correct, but I remember that it is best if the center atom has a formal charge of zero but generally, the idea is to get all elements to be as close to 0 as possible.

Nienjou Claire 1E

The most electrons you can add to an expanded octet is 10 because ultimately, you're filling up the d orbital and that can only hold up to 10.

Nienjou Claire 1E

How does charge influence bond length? Does bond length increase as charge increases as well?

Nienjou Claire 1E

Also, I remember Chem_Mod's answer in another topic, saying that Test 3 will not cover electron configuration since we were already tested about that on the midterm.

Nienjou Claire 1E

I remember my TA saying that you can add up to 10 extra electrons since it is the d block that is involved in the expanded octet and it can hold ten electrons.

Nienjou Claire 1E

For more complicated compounds such as the H2C(NH2)COOH given in part c of 3.41, how would you go about figuring out specifically which elements are bound to which ones and in which order? It seems like a rather arduous process to test out possible combinations until you get one that gives the right...

Nienjou Claire 1E

Thanks so much: the replies really cleared it up! A follow-up question: if the correct lewis structure is a combination of the possible "correct" ones, why would we still need to calculate formal charge? Is that just to determine the result of resonance?

Nienjou Claire 1E

Can someone explain the concept of resonance? I still don't really understand what it is exactly and how it relates to drawing Lewis structures.

Nienjou Claire 1E

Regarding the expanded octet, it's just that elements that are below the 3rd row have a d orbital or more that can bond if needed

Nienjou Claire 1E

For this, you wouldn't need the mass of the molecule. The structures themselves give you the molecular formula since it shows you exactly how many of each element is in the molecule. You can literally count the how many of each element there are and that is basically the molecular formula. To get th...

Nienjou Claire 1E

First off, covalent bonds are between nonmetals and ionic bonds are between a metal and nonmetal. The biggest, and most important, difference is that elements in an ionic bond are more aggressive so it kind of takes the electron, which produces a charge for the overall molecule. Covalent bond elemen...

Nienjou Claire 1E

Also, does anyone know where we can get practice midterms? Does the test bank have any?

Nienjou Claire 1E

Then, you would plug in 6.626 x 10^-34 for the h in h/2pi

Nienjou Claire 1E

How do you know if an element will be a cation or anion if it is the same distance away from 2 different noble gases? Will they provide you with the information?

Nienjou Claire 1E

Can someone explain in simple terms why 4s orbitals are a lower energy than 3d and thus should be written first?

Nienjou Claire 1E

Work function and threshold energy are the same thing.

Nienjou Claire 1E

My TA said that just as you know the general ranges and order of the wavelengths you should be fine. She did say that it would be best if you knew that visible light is 400 to 700 nm.

Nienjou Claire 1E

The average for my section was around a 22/40. My friend told me that her TA said that they would try to make it so that most people at least passed but I don't know how exactly that's gonna happen. They did say that they were aware of how hard it was and that for test number 2, they would include a...

Nienjou Claire 1E

I don't trust atoms...
I heard they make up everything.

Nienjou Claire 1E

You could also see what units the original problem gives for the numbers and follow that.

Nienjou Claire 1E

I think reading the textbook definitely helps. Personally, I feel like it gives me a better overview of the big topics I am supposed to be learning. Professor Lavelle's lecture tend to be a little more focused on one specific topic and one specific example so I read the textbook to link ideas togeth...

Nienjou Claire 1E

Q: what kind of dogs do scientists have?
A: laboratory retrievers

Nienjou Claire 1E

Yes, you are exactly right! The only difference is that an ionic bond is a bond between a metal and a nonmetal and then a metallic bond is between 2 metals. Again, just look at the periodic table to determine whether an element is a nonmetal or metal.

Nienjou Claire 1E

To put it simply, a covalent bond is a bond between 2 nonmetals. You can just look up the elements on the periodic table to determine if it is a nonmetal. They are to the right of the "staircase"-like divider.

CHEMISTRY COMMUNITY

Search found 30 matches

Re: polar and nonpolar molecules

Re: Ligands

Re: pi and sigma bonds

d-block Lewis structures

Re: Post All Chemistry Jokes Here

Re: Coordination compound

Re: Prioritizing Formal Charge

Re: Maximum number of electrons in expanded octet

bond length and charge

Re: Test #3

Re: Exceptions to the Octet

3.41c

Re: resonance

resonance

Re: Expanded Octet

Re: Test 1/ Question 8 [ENDORSED]

Re: Covalent vs. Ionic

Re: Midterm Topics [ENDORSED]

Re: Using the uncertainty principle [ENDORSED]

cation or anion?

3d and 4s orbitals

Re: Threshold Energy [ENDORSED]

Re: Wavelengths

Re: Test Number 1

Re: Post All Chemistry Jokes Here

Re: Units for Answer

Re: Reading the textbook

Re: Post All Chemistry Jokes Here

Re: Types of Bonds

Re: Types of Bonds