Search found 35 matches
- Sat Dec 08, 2018 11:45 pm
- Forum: Amphoteric Compounds
- Topic: Amphiprotic vs. Amphoteric
- Replies: 7
- Views: 983
Re: Amphiprotic vs. Amphoteric
I believe not all amphoteric compounds are amphiprotic because as they're acting as both an acid and a base, it could involve the electron transfer instead of the hydrogen transfer.
- Sat Dec 08, 2018 11:41 pm
- Forum: Hybridization
- Topic: Hybrid Orbitals
- Replies: 1
- Views: 421
Hybrid Orbitals
I have an example problem I'm not sure what it's asking exactly or how to solve:
Identify the hybrid orbital used by the atom (bolded and underlined) in the molecule CH3CCCH3 (second carbon)
Identify the hybrid orbital used by the atom (bolded and underlined) in the molecule CH3CCCH3 (second carbon)
- Sat Dec 08, 2018 11:37 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 3
- Views: 518
Re: Bond Angles
If a molecule is bent, wouldn't the angle be slightly less than 120 or 109.5 degrees since there would be a stronger repulsion by the lone pair of electrons?
- Fri Dec 07, 2018 11:18 pm
- Forum: Naming
- Topic: mono- prefix
- Replies: 2
- Views: 438
mono- prefix
When are we supposed to use the mono prefix? Is it just if the first ligand in alphabetical order is singular? Will we get marked incorrect if we always include the prefix?
- Fri Dec 07, 2018 11:16 pm
- Forum: Naming
- Topic: Final Exam
- Replies: 9
- Views: 902
Re: Final Exam
For Gail's review session she recommended that we do know both just in case. The chemical formula of EN is C2H8N2. The chemical formula of EDTA is C10H16N2O8. I think I was told to memorize them how they are on the Ligand Names in Coordination Compounds chart on Lavelle's website. Ethylenediamine h...
- Fri Dec 07, 2018 10:56 pm
- Forum: Naming
- Topic: Chloro v/s chlorido
- Replies: 6
- Views: 846
Re: Chloro v/s chlorido
Is there any instance that you would you "chlorine" when naming or just "chloride"? What's the explanation behind using either?
- Fri Dec 07, 2018 10:54 pm
- Forum: Dipole Moments
- Topic: London Dispersion Forces vs Dipole Dipole
- Replies: 3
- Views: 956
Re: London Dispersion Forces vs Dipole Dipole
In problems where one molecule has stronger dipole-dipole forces while the other molecule has stronger London dispersion forces, why would the molecule with stronger London dispersion forces have a higher melting point? Isn't dipole-dipole stronger than LDF in terms of intermolecular forces?
- Fri Dec 07, 2018 10:51 pm
- Forum: Hybridization
- Topic: lone pairs of e-
- Replies: 4
- Views: 449
Re: lone pairs of e-
There was a lone pair hybridization problem on one on the review worksheets from a UA. It was a lone pair on the nitrogen and the hybridization was sp. Are the lone pair of electrons on an atom always going to be hybridized?
- Wed Dec 05, 2018 1:11 am
- Forum: Bronsted Acids & Bases
- Topic: Memorizing Acid and Bases
- Replies: 2
- Views: 341
Re: Memorizing Acid and Bases
J.11 (6th edition) asks to identify the acid and bases in the chemical reactions given. Part C gives the reaction: 2 HI + CaO --> CaI 2 + H 2 O. I don't understand how HI is the acid and CaO is the base. Is this something we're supposed to memorize or is there a way to tell which direction the proto...
- Wed Dec 05, 2018 12:57 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligands
- Replies: 7
- Views: 597
Re: Ligands
I'm confused about 17.33 (6th edition) on the homework which asks which ligands can be polydentate. Part B gives the molecule CO32-. Why is the answer that it can bind through either one or two oxygen atoms? Why isn't the answer definite? Why can't it bind to all three oxygens?
- Tue Dec 04, 2018 2:23 pm
- Forum: Resonance Structures
- Topic: Delocalization
- Replies: 6
- Views: 1194
Re: Delocalization
Does delocalization have anything to do with hybridization? Like does in happen in conjunction with only pi bonds?
- Tue Dec 04, 2018 2:20 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted v Lewis
- Replies: 3
- Views: 415
Re: Bronsted v Lewis
Will we ever have to determine if a compound is a Bronsted acid or Lewis acid on a test? If so, how would you determine if an electron or proton is being moved?
- Tue Dec 04, 2018 2:18 pm
- Forum: Naming
- Topic: Prefix bis, tris, tetrakis, etc. [ENDORSED]
- Replies: 5
- Views: 773
Re: Prefix bis, tris, tetrakis, etc. [ENDORSED]
Vicky Lu 1L wrote:Di-, tri-, and tetra- should be used for multiple monodentate ligands while bis-, tris-, tetrakis- would be used for for multiple polydentate ligands.
What is a monodentate ligand and what's a polydentate ligand? I don't understand the difference.
- Tue Dec 04, 2018 2:16 pm
- Forum: Naming
- Topic: Ligand Names In Coordination Compounds
- Replies: 1
- Views: 247
Ligand Names In Coordination Compounds
Do we need to know all of this sheet, like both the name column and the New IUPAC Name Convention? Also, when writing ethylenediamine and diethylenediamine do we need to write all of it out or can we just use (en) and (dien)?
- Sun Nov 18, 2018 11:59 pm
- Forum: Resonance Structures
- Topic: Drawing resonance
- Replies: 17
- Views: 1890
Re: Drawing resonance
SophiaKohlhoff4B wrote:It is important to draw the resonance for a molecule because it demonstrates that the actual bond lengths are the average of the bond lengths.
Do we need to include something to show the bond lengths are an average and the same or is that implied when we draw the resonance structures?
- Sun Nov 18, 2018 11:56 pm
- Forum: Electronegativity
- Topic: Question about what makes something ionic
- Replies: 5
- Views: 495
Re: Question about what makes something ionic
Are we going to be given an electronegative chart on the test?
- Sun Nov 18, 2018 11:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Workshops
- Replies: 5
- Views: 766
Re: Workshops
Will there be sessions week eight before Thanksgiving break?
- Sun Nov 11, 2018 11:28 pm
- Forum: Bond Lengths & Energies
- Topic: High Boiling Points and Bond Strengths [ENDORSED]
- Replies: 4
- Views: 845
Re: High Boiling Points and Bond Strengths [ENDORSED]
I believe that it's the other way around, because the rod-shaped bonds are stronger, the boiling point is higher. However, I don't understand why a rod-shaped structure would have stronger bonds.
- Sun Nov 11, 2018 11:24 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond angles
- Replies: 3
- Views: 350
Re: Bond angles
I have the sixth edition textbook so I don't think the problem coresponds, but I believe if you are given a molecule, you first would decide the struture - tetrahedral - which would then tell you the angles are 109.5 degrees.
- Sun Nov 11, 2018 11:22 pm
- Forum: Dipole Moments
- Topic: Hydrogen Bonds
- Replies: 20
- Views: 1562
Re: Hydrogen Bonds
From Friday's lecture, what does "hydrogen bonds are most electrostatic in nature mean"?
- Sun Nov 04, 2018 11:10 pm
- Forum: Resonance Structures
- Topic: Resonance Structures
- Replies: 2
- Views: 331
Re: Resonance Structures
In nature, you would see a resonance hybrid- a blending of the different lewis resonance structures. This is representative of the different places electrons can be.
- Sun Nov 04, 2018 11:01 pm
- Forum: Octet Exceptions
- Topic: Radicals
- Replies: 16
- Views: 1749
Re: Radicals
Put the radical on whatever atom will give it the last formal charge (attempt to get the molecule stable as possible).
- Sun Nov 04, 2018 11:00 pm
- Forum: Octet Exceptions
- Topic: Incomplete Octet
- Replies: 5
- Views: 1347
Re: Incomplete Octet
How will you know if boron (or any other element) will be satisfied with an incomplete octet (BF3) or want a complete octet (BF4-)?
- Sun Oct 28, 2018 9:52 pm
- Forum: Electronegativity
- Topic: Electronegativity vs Electron Affinity
- Replies: 4
- Views: 37115
Re: Electronegativity vs Electron Affinity
Electronegativity is the tendency of an atom to attract electrons, while electron affinity is the amount of energy released when an electron is added to a neutral atom. They have the same trend (increase as you go across and decrease as you go down the periodic table).
- Sun Oct 28, 2018 9:45 pm
- Forum: Octet Exceptions
- Topic: Electron Configuration
- Replies: 5
- Views: 661
Re: Electron Configuration
But in what instance would 3d (or any d orbital) have a lower energy than s? Is it all the time?
- Sun Oct 28, 2018 9:42 pm
- Forum: Octet Exceptions
- Topic: Expanded Valence Shells
- Replies: 3
- Views: 387
Re: Expanded Valence Shells
Are expanded valence shells any atoms with a d block?
- Sun Oct 21, 2018 4:43 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Shielding [ENDORSED]
- Replies: 15
- Views: 2155
Re: Shielding [ENDORSED]
What are the consequences of shielding? I understand it means the electrons far away from the nucleus are less electronegative, but why does it matter?
- Sun Oct 21, 2018 4:37 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg Equation
- Replies: 7
- Views: 706
Re: Rydberg Equation
Is the Rydberg equation the one Dr. Lavelle said in lecture not to use? What do we use instead?
- Sun Oct 21, 2018 4:33 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Representation
- Replies: 4
- Views: 622
Re: Representation
Can you explain how the uncertainty principle is applied to real life situations? In a session today, we did an example that asked for the minimum indeterminacy of a bowling ball's position and if you coulf blame Heisenberg's Uncertainty Principle when you miss the pins and I don't really see how it...
- Sun Oct 14, 2018 10:51 pm
- Forum: Properties of Electrons
- Topic: Energy Q
- Replies: 4
- Views: 237
Re: Energy Q
What effect does quantized energy have on chemistry? What difference does it make in the class/homework problems?
- Sun Oct 14, 2018 10:47 pm
- Forum: DeBroglie Equation
- Topic: Particle wave duality
- Replies: 3
- Views: 349
Re: Particle wave duality
So a car would not have any measurable wavelike properties simply due to its large mass? What quota would an object need to fufill to be considered too large to have measurable wasvelike properties or not?
- Sun Oct 14, 2018 10:45 pm
- Forum: DeBroglie Equation
- Topic: Wavelength Verification in Lab
- Replies: 2
- Views: 120
Wavelength Verification in Lab
In the last problem during lecture, the answer to the question "Could the calculated wavelength be experimentally verified or detected in a lab?" was yes. How did we reach that conclusion? In future problems how will I know if the answer should be yes or no?
- Thu Oct 04, 2018 11:33 pm
- Forum: SI Units, Unit Conversions
- Topic: Homework: E1, 6th Ed.
- Replies: 5
- Views: 554
Re: Homework: E1, 6th Ed.
Adding onto the question above. I understand how the answer would come out but using the SI measurements, would it be incorrect to leave the answer in meters and not kilometers. And if it would be incorrect could someone explain to me why that would be the case? I have the same question. Wouldn't y...
- Thu Oct 04, 2018 4:43 pm
- Forum: SI Units, Unit Conversions
- Topic: How does grading for discussion posts work?
- Replies: 80
- Views: 8846
Re: How does grading for discussion posts work?
Do you guys know when our first test is? In the website, there is a tab that says "Test and Exam Schedule" but the first test will be on October 9 in your discussion section. ^Does anyone know if there is going to be a review for the test? I'm not sure what you're asking for about review....
- Thu Oct 04, 2018 4:37 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Where to find assignments
- Replies: 5
- Views: 452
Re: Where to find assignments
From what I understand, the homework assignment is always going to be 7 problems from the list of your choosing as long as they are topics we've recently covered.