Search found 20 matches
- Thu Dec 07, 2017 4:50 pm
- Forum: Amphoteric Compounds
- Topic: Acidic, basic, or amphoteric? [ENDORSED]
- Replies: 4
- Views: 1990
Re: Acidic, basic, or amphoteric? [ENDORSED]
"Where exactly is the line that separates metals from nonmetals?" Not sure what answer you're exactly looking for but in speaking in terms of properties, metals are conductive, malleable, and solid (at room temp) and non-metals are not conductive, brittle, and gaseous/liquid/solid (at room...
- Thu Dec 07, 2017 4:43 pm
- Forum: Lewis Acids & Bases
- Topic: Identifying Lewis Acid
- Replies: 3
- Views: 646
Identifying Lewis Acid
Why is it important to list the oxidation state when identifying the Lewis Acid? For example, for the Lewis Structure [PtCl4(NH3)2], the Lewis Acid is Pt(IV). Why would it be wrong to just put Pt? thanks
- Thu Dec 07, 2017 4:34 pm
- Forum: Bronsted Acids & Bases
- Topic: Single arrow vs. double arrows
- Replies: 2
- Views: 1309
Re: Single arrow vs. double arrows
Maybe it is because H2SO4 is a polyprotic acid so it has the potential to donate more protons instead of one?
- Thu Dec 07, 2017 4:21 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Formic Acid and Acetic Acid
- Replies: 2
- Views: 752
Re: Formic Acid and Acetic Acid
I'm not really sure but I found this link on Google that may be able to help: https://chemistry.stackexchange.com/que ... cetic-acid
- Wed Nov 29, 2017 8:06 pm
- Forum: Conjugate Acids & Bases
- Topic: Chemical Formula
- Replies: 5
- Views: 741
Re: Chemical Formula
If it's a metal it's a base. If it's a nonmetal it's an acid. For example, KOH and NaOH are bases because they contain alkaline earth metals. HBr and HCl are acids because they contain nonmetals.
- Wed Nov 29, 2017 8:02 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE box
- Replies: 3
- Views: 744
Re: ICE box
-x applies to the reactants and +x applies to the products.
- Sun Nov 19, 2017 4:57 pm
- Forum: Hybridization
- Topic: Shape of Hybrid Orbitals?
- Replies: 2
- Views: 465
Shape of Hybrid Orbitals?
Do hybrid orbitals have a shape? We know the shape of pi and sigma bonds, and I was curious what kind of shape do hybrid orbitals have.
- Sun Nov 19, 2017 4:07 pm
- Forum: Lewis Structures
- Topic: Lewis Structure of CO
- Replies: 2
- Views: 368
Re: Lewis Structure of CO
The second structure is right because carbon needs an octet. In the first structure, carbon needs two more electrons to fufill the octet rule.
- Sun Nov 12, 2017 3:33 pm
- Forum: Lewis Structures
- Topic: atomic structure of HOCO
- Replies: 8
- Views: 1216
Re: atomic structure of HOCO
The H in the molecular formula is next to the O, so when you draw out the lewis structure, you would draw the H bonded with the O and not with C.
- Sun Nov 12, 2017 3:27 pm
- Forum: Dipole Moments
- Topic: Dipole Moments
- Replies: 2
- Views: 400
Re: Dipole Moments
When dipole moments point directly to each other or away from each other with the same strength, they cancel. If they point directly to each other or away, but with different dipole moment strengths the dipole moments wouldn't cancel.
- Sun Nov 12, 2017 3:07 pm
- Forum: Lewis Structures
- Topic: Midterm Question CH3SH
- Replies: 5
- Views: 1064
Midterm Question CH3SH
So I bonded carbon with 3 hydrogens and bonded carbon with sulfur (sulfur has 2 lone pairs) and bonded sulfur with hydrogen. It has a total of 14 e-. Just wanted to compare and check if I got this right. Thanks!
- Mon Nov 06, 2017 5:28 pm
- Forum: Lewis Structures
- Topic: Lone Pairs and H2O
- Replies: 2
- Views: 491
Lone Pairs and H2O
Can someone help clarify why the shape of H2O is not linear but bent? Thanks in advance.
- Sun Oct 29, 2017 4:56 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Valence electrons [ENDORSED]
- Replies: 7
- Views: 2601
Re: Valence electrons [ENDORSED]
Yes, those are the outermost electrons (valence e-).
- Sun Oct 29, 2017 4:53 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Determining Formal Charge [ENDORSED]
- Replies: 3
- Views: 572
Re: Determining Formal Charge [ENDORSED]
Formal charge of 0 corresponds to lower energy and is more stable.
- Sat Oct 21, 2017 10:47 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: s-electrons and p-electrons [ENDORSED]
- Replies: 2
- Views: 437
Re: s-electrons and p-electrons [ENDORSED]
Because of the different shapes of s and p orbitals, in a multi-electron system the energy of s-orbitals is lower than the energy of p-orbitals because of the small differences in attraction they feel from the nucleus. S-orbitals is spherical and symmetrical with no nodal planes, while p-orbitals ar...
- Mon Oct 16, 2017 7:46 pm
- Forum: Photoelectric Effect
- Topic: Post Module #19
- Replies: 3
- Views: 564
Post Module #19
Which one of following is not describing the photoelectric effect?
A. E (photon) – E (remove e-) = E (excess)
B. E (photon) – E (remove e-) = EK (e-)
C. hv - work function = 1/2mv2
D. λv = c
E. None of the above
What is the answer to this and can someone explain why? Thanks!
A. E (photon) – E (remove e-) = E (excess)
B. E (photon) – E (remove e-) = EK (e-)
C. hv - work function = 1/2mv2
D. λv = c
E. None of the above
What is the answer to this and can someone explain why? Thanks!
- Fri Oct 13, 2017 9:56 am
- Forum: Photoelectric Effect
- Topic: Kinetic energy equal to zero?
- Replies: 4
- Views: 2545
Kinetic energy equal to zero?
How do you know when to set the kinetic energy equal to zero? What's the key information they give you? thanks!
- Fri Oct 13, 2017 9:50 am
- Forum: Properties of Electrons
- Topic: Threshold level and Work Function [ENDORSED]
- Replies: 6
- Views: 1080
Threshold level and Work Function [ENDORSED]
Threshold level and Work Function are basically the same thing right?
- Thu Oct 05, 2017 9:46 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Where to find Bruincast?
- Replies: 3
- Views: 820
Where to find Bruincast?
Hi, where can I find the link to Bruincast? Will we have it this year? Not really sure how this works. If someone can explain, thanks!
- Tue Oct 03, 2017 5:02 pm
- Forum: Empirical & Molecular Formulas
- Topic: Problem E5
- Replies: 6
- Views: 3490
Problem E5
(A) The approximate population of Earth is 7.0 billion people. How many moles of people inhabit Earth? (B) If all people were pea pickers, how long would it take for the entire population of Earth to pick 1 mol of peas at the rate of one pea per second, working 24 hours per day, 365 days per year? O...