## Search found 31 matches

Sat Dec 08, 2018 11:27 pm
Forum: Conjugate Acids & Bases
Topic: Can someone check if I'm right
Replies: 2
Views: 381

### Can someone check if I'm right

If given this formula: H2SO4(aq) + H2O (l) → HSO4- (aq) + H3O+ (aq)
H2SO4(aq)= bronsted acid
HSO4- = conjugate base
H3O= conjugate acid
Sat Dec 08, 2018 11:17 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Conjugate?
Replies: 5
Views: 432

### Re: Conjugate?

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...
Sat Dec 08, 2018 11:01 pm
Forum: Conjugate Acids & Bases
Topic: HCO3- an acid or base
Replies: 2
Views: 656

### HCO3- an acid or base

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?
Sat Dec 08, 2018 10:46 pm
Forum: Naming
Topic: Regarding the test... [ENDORSED]
Replies: 12
Views: 4553

### Re: Regarding the test...[ENDORSED]

do we have to know the actual chemical composition of en or can we just memorize that en pairs as a bidentate
Sat Dec 08, 2018 8:47 pm
Forum: Administrative Questions and Class Announcements
Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Replies: 118
Views: 13716

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

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...
Sat Dec 08, 2018 8:34 pm
Forum: Biological Examples
Topic: Myoglobin and Hemoglobin
Replies: 1
Views: 275

### Re: Myoglobin and Hemoglobin

According to the UA's answer key, 4.
Sat Dec 08, 2018 8:33 pm
Forum: Administrative Questions and Class Announcements
Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Replies: 118
Views: 13716

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

What is a porphyrin ligand and will we be asked about ligands like this on the test?
Sat Dec 08, 2018 3:19 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Ordering Polarizability and Polarizing Power
Replies: 4
Views: 788

### Re: Ordering Polarizability and Polarizing Power

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...
Sat Dec 08, 2018 12:14 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Dispersion and Mass?
Replies: 1
Views: 287

### Dispersion and Mass?

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?
Sat Dec 08, 2018 11:05 am
Forum: Lewis Acids & Bases
Topic: Trends of Acids and Bases
Replies: 2
Views: 186

### Trends of Acids and Bases

Are acids with an A-H bond stronger than acids with an AO-H bond?
Sat Dec 08, 2018 10:21 am
Forum: Bronsted Acids & Bases
Topic: List of strong/weak acids/bases
Replies: 3
Views: 233

### Re: List of strong/weak acids/bases

Thank you so much!
Sat Dec 08, 2018 10:18 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Ka and Kb on Final
Replies: 9
Views: 2250

### Re: Ka and Kb on Final

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?
Sat Dec 08, 2018 10:00 am
Forum: Bronsted Acids & Bases
Topic: Arrhenius Acids and Bases
Replies: 1
Views: 122

### Arrhenius Acids and Bases

Why is NH3 neither an Arrhenius acid or base and why is CH3COOH an Arrhenius acid?
Fri Dec 07, 2018 12:25 pm
Forum: Naming
Topic: Coordination Compounds on the Final
Replies: 2
Views: 158

### Coordination Compounds on the Final

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?
Fri Dec 07, 2018 11:58 am
Forum: Bronsted Acids & Bases
Topic: Question on Acidity
Replies: 1
Views: 114

### Question on Acidity

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?
Fri Dec 07, 2018 11:49 am
Forum: Conjugate Acids & Bases
Topic: Inductive Effect
Replies: 5
Views: 268

### Re: Inductive Effect

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.
Thu Dec 06, 2018 9:44 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: ordering
Replies: 2
Views: 406

### Re: ordering

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 -
Thu Dec 06, 2018 8:24 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Ordering Polarizability and Polarizing Power
Replies: 4
Views: 788

### Re: Ordering Polarizability and Polarizing Power

Can someone please explain why this is the order?
Thu Dec 06, 2018 8:18 am
Forum: Administrative Questions and Class Announcements
Topic: Practice/Final Studying
Replies: 2
Views: 233

### Re: Practice/Final Studying

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...
Thu Dec 06, 2018 8:11 am
Forum: Administrative Questions and Class Announcements
Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Replies: 118
Views: 13716

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

Thank you! This is really appreciated.
Tue Dec 04, 2018 10:03 pm
Forum: Bronsted Acids & Bases
Topic: Homework Fundamentals J.9
Replies: 1
Views: 172

### Homework Fundamentals J.9

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...
Tue Dec 04, 2018 12:57 pm
Forum: Lewis Acids & Bases
Topic: How to Identify Lewis acid and Bases
Replies: 4
Views: 652

### How to Identify Lewis acid and Bases

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...
Tue Dec 04, 2018 12:44 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations for ions
Replies: 2
Views: 208

### Electron Configurations for ions

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?
Wed Nov 28, 2018 12:09 am
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge vs Partial charge
Replies: 4
Views: 883

### Formal Charge vs Partial charge

What is the difference between a formal charge and a partial charge and when should you use each?
Tue Nov 27, 2018 2:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Chapter 4 Sixth Edition Number 11
Replies: 1
Views: 102

### Chapter 4 Sixth Edition Number 11

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?
Tue Nov 27, 2018 8:52 am
Forum: Determining Molecular Shape (VSEPR)
Topic: General question on Molecular Shape
Replies: 2
Views: 55

### General question on Molecular Shape

Generally speaking, when determining the shape of a molecule how can you tell which atoms are going to fall in the same plane?
Tue Nov 27, 2018 8:40 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecule Shape for HCN
Replies: 2
Views: 303

### Molecule Shape for HCN

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.
Tue Oct 30, 2018 12:42 am
Forum: Ionic & Covalent Bonds
Topic: Number of Unpaired Electrons
Replies: 3
Views: 238

### Number of Unpaired Electrons

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?
Fri Oct 05, 2018 12:18 am
Forum: Limiting Reactant Calculations
Topic: Percent Yield
Replies: 5
Views: 510

### Re: Percent Yield

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%
Fri Oct 05, 2018 12:12 am
Forum: Molarity, Solutions, Dilutions
Topic: Homework Question G5
Replies: 3
Views: 89

### Re: Homework Question G5

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?
Fri Oct 05, 2018 12:08 am
Forum: Molarity, Solutions, Dilutions
Topic: Problem G5
Replies: 8
Views: 405

### Re: Problem G5

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.