Search found 51 matches
- Sat Dec 07, 2019 11:10 pm
- Forum: Lewis Acids & Bases
- Topic: B(OH)3 problem 6.13
- Replies: 2
- Views: 1201
B(OH)3 problem 6.13
How are we supposed to know that Boric acid B(OH)3 is a lewis acid? I woulve thought it would be a weak base b/c it has an OH in it. Also in terms of writing equations how do lewis acids/bases and bronsted acids/bases differ?
- Thu Dec 05, 2019 5:04 am
- Forum: Conjugate Acids & Bases
- Topic: buffer solutions
- Replies: 5
- Views: 559
buffer solutions
Does anyone know if we need to be able to identify buffer solutions for the final?
- Thu Dec 05, 2019 12:18 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: deciding pH
- Replies: 1
- Views: 154
Re: deciding pH
I think the book is using the calculations that Lavelle told us we would learn in 14B. He went over a few examples of those briefly today in lecture.
- Thu Dec 05, 2019 12:17 am
- Forum: Bronsted Acids & Bases
- Topic: HF is a weak acid?
- Replies: 8
- Views: 1109
Re: HF is a weak acid?
Fluorine is too small to accommodate the negative charge. Don't think of strength of acids based on electronegativity but based on electronegativity AND size.
- Thu Dec 05, 2019 12:15 am
- Forum: Conjugate Acids & Bases
- Topic: conjugate base and pH
- Replies: 4
- Views: 1928
Re: conjugate base and pH
Why doesn't the conjugate base of a strong acid affect pH? The conjugate base of a strong acid is a stable compound that is also a weak base. As it is a stable compound, it does not have much charge and will not prompt further electron or proton transfer, therefore not affecting the pH So if this w...
- Thu Dec 05, 2019 12:13 am
- Forum: Amphoteric Compounds
- Topic: Amphoteric vs Amphiprotic
- Replies: 9
- Views: 529
Re: Amphoteric vs Amphiprotic
Amphiprotic means that a substance can both accept and donate a proton or H+. Amphoteric means that a substance can act as both an acid and a base. All amphoteric substances are amphiprotic because if a molecule can either donate or accept a proton, that means it can act as both an acid or a base. ...
- Thu Dec 05, 2019 12:11 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: How does anion stability contribute to relative acidity?
- Replies: 6
- Views: 427
Re: How does anion stability contribute to relative acidity?
Not entirely sure how the anion portion of this affects it but what I learned was that the more stable the base, means it is a weak base, and will produce a strong acid.
- Thu Dec 05, 2019 12:09 am
- Forum: Lewis Acids & Bases
- Topic: How to identify acid vs. base
- Replies: 4
- Views: 213
Re: How to identify acid vs. base
Nawal Dandachi 3G wrote:lewis acid is an electron-pair acceptor while a lewis base is an electron-pair donor.
Is the donor/receptor just based off of electropositivity and electronegativity respectively?
- Thu Dec 05, 2019 12:08 am
- Forum: Lewis Acids & Bases
- Topic: Memorizing Charges of Transition Metals
- Replies: 9
- Views: 788
Re: Memorizing Charges of Transition Metals
Can't the same metal have different oxidation states, though? Like Fe can be +2 or +3 Yes, but to figure out which oxidation state the metal has, we use the ligands to figure out the charge that we must balance out. As such, memorizing the ligands essentially works towards knowing the oxidation sta...
- Thu Dec 05, 2019 12:06 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Ice tables
- Replies: 3
- Views: 192
Re: Ice tables
One of the UA's said we don't need to know the Ice tables.
- Thu Dec 05, 2019 12:05 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: paramagnetism
- Replies: 8
- Views: 663
Re: paramagnetism
if a paramagnetic electron means it is unpaired, then does that mean the molecule is radical? okay I thought about this more and I am going to answer my own question, I realized that a paramagnetic electron from one atom could bond with a paramagnetic electron from another atom so it is not always ...
- Thu Dec 05, 2019 12:04 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Content of the final
- Replies: 11
- Views: 970
Re: Content of the final
We learned bond order if by bond order you mean strength but im not sure about the molecular orbital theory or what that entails. I would go off the Lavelles practice problem sheets he lists the key concepts of that unit down below and I would assume all of them would be on the exam or could be on t...
- Thu Dec 05, 2019 12:02 am
- Forum: Hybridization
- Topic: sp3d and onward
- Replies: 3
- Views: 259
Re: sp3d and onward
You draw d orbitals similar to how you would draw a pi bond i think, however i dont think we will be asked to draw any of them or be asked about d orbitals to begin with, in terms of hybridization
- Thu Dec 05, 2019 12:00 am
- Forum: Hybridization
- Topic: hybridization of lone pairs
- Replies: 2
- Views: 144
Re: hybridization of lone pairs
Hybridization applies to atoms not to bonds or lone pairs, this might be some source of the confusion not entirely sure though.
- Wed Dec 04, 2019 11:58 pm
- Forum: *Crystal Field Theory
- Topic: Electric Field
- Replies: 6
- Views: 2473
Re: Electric Field
Does anyone know if this will be on the final?
- Wed Dec 04, 2019 11:58 pm
- Forum: *Crystal Field Theory
- Topic: Crystal Field Theory
- Replies: 2
- Views: 766
Re: Crystal Field Theory
I dont think we went over it so it shouldn't be on the final
- Wed Dec 04, 2019 6:26 am
- Forum: Hybridization
- Topic: Question 4.39 [ENDORSED]
- Replies: 4
- Views: 941
Re: Question 4.39 [ENDORSED]
Why does P4 have the hybridization of sp3 and not sp2?
- Wed Dec 04, 2019 5:57 am
- Forum: Sigma & Pi Bonds
- Topic: finding hybridizations
- Replies: 2
- Views: 268
finding hybridizations
when can you say if there should be a coeficient greater than 1 in front of a hybridization like 2sp3 or something like that as opposed to just sp3?
- Wed Dec 04, 2019 3:57 am
- Forum: Sigma & Pi Bonds
- Topic: Resonance and Sigma/Pi Bonds
- Replies: 3
- Views: 638
Re: Resonance and Sigma/Pi Bonds
As far as I know resonance structures at this level shouldn't affect the number of sigma and pi bonds as the creation or reduction of sigma and pi bonds via the manipulation of lone pair electrons would change the formal charge and I think we only need to worry about the resonance structures where t...
- Wed Dec 04, 2019 3:55 am
- Forum: Sigma & Pi Bonds
- Topic: How to Find Sigma Bonds and Pi Bonds
- Replies: 15
- Views: 1162
Re: How to Find Sigma Bonds and Pi Bonds
The lewis or VSPER structure is the only way to find it
- Wed Dec 04, 2019 3:53 am
- Forum: Sigma & Pi Bonds
- Topic: Visualizing this
- Replies: 4
- Views: 388
Re: Visualizing this
I like to think of sigma bonds as a long cylinder and pi bonds as like a bubble encasing the sigma bond thats connected on either side. ___pi____ | ________ | C |--sigma |C |____pi____| so for my attempt here, imagine that the dashed line and solid line above it comprise of a cylinder like shape whi...
- Wed Dec 04, 2019 3:48 am
- Forum: Sigma & Pi Bonds
- Topic: Promotion
- Replies: 5
- Views: 597
Re: Promotion
Does anyone know how promotion figures into electron configuration and the bonding? Like is promotion different than just regular hybridization?
- Wed Dec 04, 2019 3:47 am
- Forum: Sigma & Pi Bonds
- Topic: Unhybridized orbitals.
- Replies: 3
- Views: 352
Re: Unhybridized orbitals.
In a normal sigma bond say something that has the orientation of 2sp2 2p2, all 3 of the p orbitals will go into the hybridization even though only 2 possess electrons. However in the case of pi bonds they occupy empty p orbitals which allow for rotation whereas sigma bonds do not. If the same electr...
- Wed Dec 04, 2019 3:16 am
- Forum: Sigma & Pi Bonds
- Topic: Carbon's hybridization
- Replies: 3
- Views: 505
Carbon's hybridization
Why is carbon's hybridization 2sp3 if there are only 2 electrons present in the 2p orbital? I know carbon has 4 valance electrons, 2 from the filled up 2s2 orbital and then the remaining 2 from the 2p level as to give it the 1s2 2s2 2p2 configuration so why then is its hybridization listed as 2sp^3?...
- Sun Dec 01, 2019 6:27 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Wavelength Plausibility
- Replies: 31
- Views: 2570
Re: Wavelength Plausibility
For the final do we need to have the different wavelength series memorized for the energy required to raise it one energy level like quantum state =1, n=2 etc?
- Sun Dec 01, 2019 6:13 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation [ENDORSED]
- Replies: 73
- Views: 8657
Re: Rydberg equation [ENDORSED]
Is there something the Rydberg equation should NOT be used for? I remember my TA saying something about if we used the Rydberg equation in a problem on midterm 1 we would receive no credit but I don't remember which problem it is.
- Sun Dec 01, 2019 6:11 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: diamagnetism
- Replies: 5
- Views: 357
Re: diamagnetism
Is there any way to know for sure if the substance is magnetic other than prior knowledge like is there a formula we need to know?
- Sun Dec 01, 2019 6:09 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Drawing sigma & Pi bonds
- Replies: 7
- Views: 596
Re: Drawing sigma & Pi bonds
How would u represent sigma bonds being end to end or side by side in the case of pi bonds in terms of drawing it?
- Sun Dec 01, 2019 6:08 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Content of the final
- Replies: 11
- Views: 970
Re: Content of the final
Do we know up to what topic in the book will be tested on for the final?
- Sun Nov 24, 2019 4:06 pm
- Forum: Naming
- Topic: Coordination number
- Replies: 7
- Views: 370
Re: Coordination number
do coordination numbers also depends on the size of the coordination compound?
- Sun Nov 24, 2019 4:05 pm
- Forum: Naming
- Topic: VSEPR and Coordination Compounds
- Replies: 1
- Views: 183
Re: VSEPR and Coordination Compounds
As far as I know its basically because Coordination Compounds take into account the size of the atoms specifically the metals and ions
- Sun Nov 24, 2019 3:55 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma & Pi Bonds
- Replies: 9
- Views: 558
Re: Sigma & Pi Bonds
would a single sigma bond be stronger than say 2 pi bonds though?
- Sun Nov 24, 2019 3:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent Shape
- Replies: 31
- Views: 2819
Re: Bent Shape
the bent shape is the only one that can have 1 or 2 pairs of lone electron pairs
- Sun Nov 24, 2019 3:46 pm
- Forum: Naming
- Topic: Final Format
- Replies: 6
- Views: 334
Re: Final Format
Do yall think the final will take the full 3 hours or if the 3 hours will be more than needed like extra time
- Sun Nov 17, 2019 8:16 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Repulsion strength and Bond Angles
- Replies: 12
- Views: 666
Re: Repulsion strength and Bond Angles
So we have to have all of the angles and possible lone pair induced angles memorized for test 2?
- Sun Nov 17, 2019 8:13 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: Dipole-Induced Dipole
- Replies: 2
- Views: 939
Re: Dipole-Induced Dipole
How would the induced O2 dipole occur in the first place?
- Sun Nov 17, 2019 8:11 pm
- Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
- Topic: Viscosity
- Replies: 25
- Views: 3143
Re: Viscosity
Is there any practical application to viscosity like do yall know if there are any formulas that factor in viscosity or is it more just a property of certain substances to be aware of in general knowledge?
- Sun Nov 17, 2019 8:09 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Repulsion strength and Bond Angles
- Replies: 12
- Views: 666
Re: Repulsion strength and Bond Angles
Does anyone know if we need to have all of the bond angles of each shape memorized for Test 2? Also on that note if we do, do we need to know by how many degrees a lone pair would affect the angle or just that it would make it smaller due to electron repulsion pushing down the other atoms. Thanks!
- Sun Nov 17, 2019 8:07 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 2
- Replies: 19
- Views: 808
Re: Test 2
When drawing the Lewis structures do we have to use the dashed lines and filled in lines to demonstrate which plane the atoms are on? Or is that like a separate thing from Lewis Structures?
- Sun Nov 17, 2019 8:05 pm
- Forum: Hybridization
- Topic: Hydrogen Bonding
- Replies: 2
- Views: 82
Re: Hydrogen Bonding
Can someone explain how hydrogen bonding works in reference to polarity? Thanks
- Wed Nov 06, 2019 10:58 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Confused on Problem 1.57 (regarding the Balmer Series)
- Replies: 9
- Views: 3875
Re: Confused on Problem 1.57 (regarding the Balmer Series)
How can you tell that it is n=7 based off of the numbers? I found a couple diagrams online that show 410.2 as n=6.
- Tue Nov 05, 2019 6:41 pm
- Forum: Properties of Light
- Topic: 4b practice midterm
- Replies: 11
- Views: 1553
Re: 4b practice midterm
How do we find the frequency once we've found the Energy using E = phi + 1/2mv^2 ? because the ones that have frequency we aren't supposed to use if there is mass involved i thought
- Tue Nov 05, 2019 5:53 pm
- Forum: Limiting Reactant Calculations
- Topic: Midterm Review Q2
- Replies: 8
- Views: 4310
Re: Midterm Review Q2
First, calculate the molar mass of KMnO4 (158.09g/mol). Next, concert 5g KMnO4 to moles and 150mL to L and use the formula M=mol/L to calculate the molarity of the first solution. Lastly, use the equation M1V1=M2V2 equation to calculate the concentration of the second flask by using the value you p...
- Tue Nov 05, 2019 1:08 am
- Forum: Properties of Electrons
- Topic: Wavelength of radiation
- Replies: 12
- Views: 9269
Re: Wavelength of radiation
In the initial question, wouldn't you need to convert the velocity of the electron 3.6x10^3km.s^-1 into m.s^-1 so it would be 3.6m.s^-1 to be in SI units or am I mistaken?
- Sun Oct 20, 2019 6:06 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Tutoring? [ENDORSED]
- Replies: 121
- Views: 239025
Re: Tutoring? [ENDORSED]
If you want tutoring there are the different learning sessions- but does anyone know the functional difference between the step up and workshop? Like will they provide problems to do if you don't have any specific questions?
- Sun Oct 20, 2019 6:04 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Uncertainty in Speed [ENDORSED]
- Replies: 31
- Views: 16734
Re: Uncertainty in Speed [ENDORSED]
This equation can be used for other atoms than hydrogen right?
- Sun Oct 20, 2019 6:03 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Wavelength Plausibility
- Replies: 31
- Views: 2570
Re: Wavelength Plausibility
I know he said 720 to 400 but 700 was acceptable but wouldn't that change the calculations?
- Sun Oct 06, 2019 11:42 pm
- Forum: Limiting Reactant Calculations
- Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
- Replies: 68
- Views: 6575
Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
In my discussion we dont really use dimensional analysis per say so I would think as long as you display some work it would be fine.
- Sun Oct 06, 2019 11:40 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student [ENDORSED]
- Replies: 297
- Views: 381220
Re: Advice from a Medical Student [ENDORSED]
This was very interesting, thank you for sharing!
- Wed Oct 02, 2019 11:20 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Problem E2
- Replies: 1
- Views: 144
Problem E2
For my final answer I got down to (2.12x10^5) / (6.022x10^23) = 3.52x10^-17 % but does this mean that there is no money left since its a negative exponent or just that its a very small amount? And if its a very small amount how would one know like it in whole numbers as opposed to as a percentage of...
- Wed Oct 02, 2019 11:02 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: E1
- Replies: 13
- Views: 2985
Re: E1
I don't fully understand why they did their unit conversions as such, or how we knew to convert it to atoms at all. Thanks!