CHEMISTRY COMMUNITY

Ashley Odibo Dis3E

If given this formula: H2SO4(aq) + H2O (l) → HSO4- (aq) + H3O+ (aq)
H2SO4(aq)= bronsted acid
H2O= bronstead base
HSO4- = conjugate base
H3O= conjugate acid

Ashley Odibo Dis3E

In the reaction Ba(OH)2 + H2O = Ba + 2OH + H2O, the conjugate base is H2O and the conjugate acid is OH. Whatever was the base before the reaction becomes the conjugate acid and whatever was the acid before the problem becomes the conjugate base. Thanks for the explanation, I kept confusing which wa...

Ashley Odibo Dis3E

How do we know if HCO3- is a base or an acid. For example if it reacts with water will it be considered the acid?

Ashley Odibo Dis3E

do we have to know the actual chemical composition of en or can we just memorize that en pairs as a bidentate

Ashley Odibo Dis3E

On question 21, can someone explain why Fe has an oxidation state of +2? I get that this is because of the nitrogens, but how do the nitrogens come to have a charge of -2? I was trying to calculate the formal charge but kept getting a positive charge on the nitrogens, not a negative charge. This is...

Ashley Odibo Dis3E

According to the UA's answer key, 4.

Ashley Odibo Dis3E

What is a porphyrin ligand and will we be asked about ligands like this on the test?

Ashley Odibo Dis3E

Then for the anions why isn’t the order Cl-, S-2, P-3, and I -? I understand That I has more shells therefore has more shielding, but since P,S, and Cl are in the same period and have the same number of shells then wouldn’t the ones with a higher number electrons and lower number of protons have mor...

Ashley Odibo Dis3E

So I was doing some review and ranked the molecules in order of strongest interaction, but my answer was backward. From weakest to strongest the answer was:
H2S, H2Se, and H2Te. I figured that this was because dispersion forces increase with mass. Can someone verify if this is the correct reasoning?

Ashley Odibo Dis3E

Are acids with an A-H bond stronger than acids with an AO-H bond?

Ashley Odibo Dis3E

Thank you so much!

Ashley Odibo Dis3E

Claudia Luong 3G wrote:We do not need to know these for the final. Just in case, I think it would be good to at least keep in mind that pKa is -log(Ka) and that the bigger the value of Ka is the stronger the acid.

Does this also mean the bigger the value of Kb the stronger the base?

Ashley Odibo Dis3E

Why is NH3 neither an Arrhenius acid or base and why is CH3COOH an Arrhenius acid?

Ashley Odibo Dis3E

For the final, are we going to have to memorize the neutral and anionic ligands to name molecules and know its charge, or will they be given?

Ashley Odibo Dis3E

If acidity increases with both electronegativity and size, which one takes precedence. Like if we have molecules like H2Se and HF, which one would be more acidic?

Ashley Odibo Dis3E

So we don't need to know inductive effect at all, just the concept mentioned above? Because my TA mentioned it, but I was a bit confused by his explanation.

Ashley Odibo Dis3E

So if radii takes presedence over charge then when ordering cations (Li+, Ca2+, Cs+,Ba2+) from least to most polarizing power and anions (I-, Cl-, S2-, P3-) from least to most polarizable, would it be:

Least---------> Most
Cs+, Ba2+,Ca2+,Li+

Cl- S2-,P3-, I -

Ashley Odibo Dis3E

Can someone please explain why this is the order?

Ashley Odibo Dis3E

I don't, but when I was talking to my TA for the class he said the best way to study is by doing practice problems, so you may want to review some of Karen's worksheets or the practice for the final wksht you'll get when you look up the word "churro" in chemistry community. I hope this hel...

Ashley Odibo Dis3E

Thank you! This is really appreciated.

Ashley Odibo Dis3E

Sixth Edition: J.9. Hydrochloric acid is a strong acid. Which of the following images best represents a solution of hydrochloric acid? The green spheres represent chlorine and the gray spheres, hydrogen. Why is the answer b? (An image where the spheres of chlorine and hydrogen atoms are not connecte...

Ashley Odibo Dis3E

In reviewing for the final I'm trying to figure out easy ways to remember concepts. So can somebody correct me on whether or not the following concept is correct? When identifying Lewis acids and bases, are the acids typically the molecules without lone pairs on the central atoms while bases are mol...

Ashley Odibo Dis3E

What is the most likely charge for the ions formed by each of the following elements? Why?
a) S
b)Cd
I how to do the problems for example S would become S^-2 and Cd would become Cd^+2, but I don't know how to explain this concept, so how would you explain it?

Ashley Odibo Dis3E

What is the difference between a formal charge and a partial charge and when should you use each?

Ashley Odibo Dis3E

Write the Lewis structure, VSEPR formula, molecular shape, and bond angles for each of the following species: (a) I3-

Why does the central iodine atom have 3 lone pairs instead of forming two double bonds with the other two Iodine atoms since they can all break the octet rule?

Ashley Odibo Dis3E

Generally speaking, when determining the shape of a molecule how can you tell which atoms are going to fall in the same plane?

Ashley Odibo Dis3E

Just for clarification, is the molecule HCN linear because it has a triple bond on the side with a lone pair? Because I though molecules usually slightly bend due to lone pairs.

Ashley Odibo Dis3E

When determining the number of unpaired electrons in an atom do we look at whether electrons in the entire valence shell (n=3,n=4, etc) is full or not or whether electrons in a particular orbital (3s, 4p, 5f, etc) is full or not?

Ashley Odibo Dis3E

Can someone explain what I'm doing wrong? I keep getting 76.5 instead of 76.6. I converted the 35g of NH3 to grams of N2H4 and divided that by the actual yield and my answer continuously comes out to 76.50%

Ashley Odibo Dis3E

Because the problem started out in ml do we have to convert our answers back to ml or would we be fine keeping our final answer in L?

Ashley Odibo Dis3E

If we have another way to do the problem, but come sup with the same answer, will the professor deduct points? I completed the problem by finding the molarity, but I didn't use the m(1)v(1)=m(2)v(2) formula.

CHEMISTRY COMMUNITY

Search found 31 matches

Can someone check if I'm right

Re: Conjugate?

HCO3- an acid or base

Re: Regarding the test... [ENDORSED]

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

Re: Myoglobin and Hemoglobin

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

Re: Ordering Polarizability and Polarizing Power

Dispersion and Mass?

Trends of Acids and Bases

Re: List of strong/weak acids/bases

Re: Ka and Kb on Final

Arrhenius Acids and Bases

Coordination Compounds on the Final

Question on Acidity

Re: Inductive Effect

Re: ordering

Re: Ordering Polarizability and Polarizing Power

Re: Practice/Final Studying

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

Homework Fundamentals J.9

How to Identify Lewis acid and Bases

Electron Configurations for ions

Formal Charge vs Partial charge

Chapter 4 Sixth Edition Number 11

General question on Molecular Shape

Molecule Shape for HCN

Number of Unpaired Electrons

Re: Percent Yield

Re: Homework Question G5

Re: Problem G5