Search found 51 matches

by brennayoung
Sat Dec 07, 2019 11:10 pm
Forum: Lewis Acids & Bases
Topic: B(OH)3 problem 6.13
Replies: 2
Views: 53

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?
by brennayoung
Thu Dec 05, 2019 5:04 am
Forum: Conjugate Acids & Bases
Topic: buffer solutions
Replies: 5
Views: 81

buffer solutions

Does anyone know if we need to be able to identify buffer solutions for the final?
by brennayoung
Thu Dec 05, 2019 12:18 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: deciding pH
Replies: 1
Views: 28

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.
by brennayoung
Thu Dec 05, 2019 12:17 am
Forum: Bronsted Acids & Bases
Topic: HF is a weak acid?
Replies: 8
Views: 75

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.
by brennayoung
Thu Dec 05, 2019 12:15 am
Forum: Conjugate Acids & Bases
Topic: conjugate base and pH
Replies: 4
Views: 51

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...
by brennayoung
Thu Dec 05, 2019 12:13 am
Forum: Amphoteric Compounds
Topic: Amphoteric vs Amphiprotic
Replies: 9
Views: 69

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. ...
by brennayoung
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: 63

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.
by brennayoung
Thu Dec 05, 2019 12:09 am
Forum: Lewis Acids & Bases
Topic: How to identify acid vs. base
Replies: 4
Views: 51

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?
by brennayoung
Thu Dec 05, 2019 12:08 am
Forum: Lewis Acids & Bases
Topic: Memorizing Charges of Transition Metals
Replies: 9
Views: 82

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...
by brennayoung
Thu Dec 05, 2019 12:06 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Ice tables
Replies: 3
Views: 37

Re: Ice tables

One of the UA's said we don't need to know the Ice tables.
by brennayoung
Thu Dec 05, 2019 12:05 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: paramagnetism
Replies: 6
Views: 96

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 ...
by brennayoung
Thu Dec 05, 2019 12:04 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Content of the final
Replies: 10
Views: 257

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...
by brennayoung
Thu Dec 05, 2019 12:02 am
Forum: Hybridization
Topic: sp3d and onward
Replies: 3
Views: 51

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
by brennayoung
Thu Dec 05, 2019 12:00 am
Forum: Hybridization
Topic: hybridization of lone pairs
Replies: 2
Views: 31

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.
by brennayoung
Wed Dec 04, 2019 11:58 pm
Forum: *Crystal Field Theory
Topic: Electric Field
Replies: 5
Views: 1406

Re: Electric Field

Does anyone know if this will be on the final?
by brennayoung
Wed Dec 04, 2019 11:58 pm
Forum: *Crystal Field Theory
Topic: Crystal Field Theory
Replies: 2
Views: 56

Re: Crystal Field Theory

I dont think we went over it so it shouldn't be on the final
by brennayoung
Wed Dec 04, 2019 6:26 am
Forum: Hybridization
Topic: Question 4.39 [ENDORSED]
Replies: 4
Views: 384

Re: Question 4.39 [ENDORSED]

Why does P4 have the hybridization of sp3 and not sp2?
by brennayoung
Wed Dec 04, 2019 5:57 am
Forum: Sigma & Pi Bonds
Topic: finding hybridizations
Replies: 2
Views: 54

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?
by brennayoung
Wed Dec 04, 2019 3:57 am
Forum: Sigma & Pi Bonds
Topic: Resonance and Sigma/Pi Bonds
Replies: 3
Views: 88

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...
by brennayoung
Wed Dec 04, 2019 3:55 am
Forum: Sigma & Pi Bonds
Topic: How to Find Sigma Bonds and Pi Bonds
Replies: 15
Views: 174

Re: How to Find Sigma Bonds and Pi Bonds

The lewis or VSPER structure is the only way to find it
by brennayoung
Wed Dec 04, 2019 3:53 am
Forum: Sigma & Pi Bonds
Topic: Visualizing this
Replies: 4
Views: 76

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...
by brennayoung
Wed Dec 04, 2019 3:48 am
Forum: Sigma & Pi Bonds
Topic: Promotion
Replies: 5
Views: 85

Re: Promotion

Does anyone know how promotion figures into electron configuration and the bonding? Like is promotion different than just regular hybridization?
by brennayoung
Wed Dec 04, 2019 3:47 am
Forum: Sigma & Pi Bonds
Topic: Unhybridized orbitals.
Replies: 3
Views: 47

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...
by brennayoung
Wed Dec 04, 2019 3:16 am
Forum: Sigma & Pi Bonds
Topic: Carbon's hybridization
Replies: 3
Views: 114

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?...
by brennayoung
Sun Dec 01, 2019 6:27 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelength Plausibility
Replies: 30
Views: 1123

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?
by brennayoung
Sun Dec 01, 2019 6:13 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 73
Views: 2635

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.
by brennayoung
Sun Dec 01, 2019 6:11 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: diamagnetism
Replies: 5
Views: 83

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?
by brennayoung
Sun Dec 01, 2019 6:09 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Drawing sigma & Pi bonds
Replies: 7
Views: 116

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?
by brennayoung
Sun Dec 01, 2019 6:08 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Content of the final
Replies: 10
Views: 257

Re: Content of the final

Do we know up to what topic in the book will be tested on for the final?
by brennayoung
Sun Nov 24, 2019 4:06 pm
Forum: Naming
Topic: Coordination number
Replies: 7
Views: 48

Re: Coordination number

do coordination numbers also depends on the size of the coordination compound?
by brennayoung
Sun Nov 24, 2019 4:05 pm
Forum: Naming
Topic: VSEPR and Coordination Compounds
Replies: 1
Views: 24

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
by brennayoung
Sun Nov 24, 2019 3:55 pm
Forum: Sigma & Pi Bonds
Topic: Sigma & Pi Bonds
Replies: 9
Views: 66

Re: Sigma & Pi Bonds

would a single sigma bond be stronger than say 2 pi bonds though?
by brennayoung
Sun Nov 24, 2019 3:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent Shape
Replies: 29
Views: 378

Re: Bent Shape

the bent shape is the only one that can have 1 or 2 pairs of lone electron pairs
by brennayoung
Sun Nov 24, 2019 3:46 pm
Forum: Naming
Topic: Final Format
Replies: 6
Views: 43

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
by brennayoung
Sun Nov 17, 2019 8:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Repulsion strength and Bond Angles
Replies: 12
Views: 76

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?
by brennayoung
Sun Nov 17, 2019 8:11 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Viscosity
Replies: 15
Views: 200

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?
by brennayoung
Sun Nov 17, 2019 8:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Repulsion strength and Bond Angles
Replies: 12
Views: 76

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!
by brennayoung
Sun Nov 17, 2019 8:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 19
Views: 176

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?
by brennayoung
Sun Nov 17, 2019 8:05 pm
Forum: Hybridization
Topic: Hydrogen Bonding
Replies: 2
Views: 28

Re: Hydrogen Bonding

Can someone explain how hydrogen bonding works in reference to polarity? Thanks
by brennayoung
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: 1993

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.
by brennayoung
Tue Nov 05, 2019 6:41 pm
Forum: Properties of Light
Topic: 4b practice midterm
Replies: 11
Views: 773

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
by brennayoung
Tue Nov 05, 2019 5:53 pm
Forum: Limiting Reactant Calculations
Topic: Midterm Review Q2
Replies: 8
Views: 2024

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...
by brennayoung
Tue Nov 05, 2019 1:08 am
Forum: Properties of Electrons
Topic: Wavelength of radiation
Replies: 5
Views: 4678

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?
by brennayoung
Sun Oct 20, 2019 6:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 63
Views: 64862

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?
by brennayoung
Sun Oct 20, 2019 6:04 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty in Speed [ENDORSED]
Replies: 18
Views: 1971

Re: Uncertainty in Speed [ENDORSED]

This equation can be used for other atoms than hydrogen right?
by brennayoung
Sun Oct 20, 2019 6:03 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelength Plausibility
Replies: 30
Views: 1123

Re: Wavelength Plausibility

I know he said 720 to 400 but 700 was acceptable but wouldn't that change the calculations?
by brennayoung
Sun Oct 06, 2019 11:42 pm
Forum: Limiting Reactant Calculations
Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Replies: 68
Views: 2395

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.
by brennayoung
Sun Oct 06, 2019 11:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 158
Views: 102376

Re: Advice from a Medical Student [ENDORSED]

This was very interesting, thank you for sharing!
by brennayoung
Wed Oct 02, 2019 11:20 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Problem E2
Replies: 1
Views: 82

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...
by brennayoung
Wed Oct 02, 2019 11:02 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E1
Replies: 6
Views: 869

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!

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