Search found 40 matches

by Alysia Garcia 1B
Wed Jun 13, 2018 11:57 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 1
Views: 132

Ligands

How do we know if a ligand can bind more than once?
by Alysia Garcia 1B
Tue Jun 12, 2018 10:40 pm
Forum: Identifying Acidic & Basic Salts
Topic: 12.65
Replies: 1
Views: 196

12.65

For part d of the problem, KBr has a neutral pH but why would that be. I know it dissociates into K+ and Br- and forms HBr and OH-, so how would this be neutral? In part C, the salt was KF and formed HF and OH- yet would increase the pH. What causes this difference?
by Alysia Garcia 1B
Tue Jun 12, 2018 4:00 pm
Forum: Lewis Acids & Bases
Topic: French Toast #31
Replies: 1
Views: 193

French Toast #31

It was explained that H2se has a higher boiling point than H2S because its bond is stronger but I though the farther away elements, the weaker the bond is. Could someone please explain?
by Alysia Garcia 1B
Tue Jun 12, 2018 2:57 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Carbon ring
Replies: 1
Views: 71

Carbon ring

How do we know when carbon should form a ring instead of a chain?
by Alysia Garcia 1B
Tue Jun 12, 2018 2:15 pm
Forum: Bronsted Acids & Bases
Topic: J.7
Replies: 2
Views: 190

Re: J.7

How would we know Zn is a cation? is that just memorization?
by Alysia Garcia 1B
Sat Jun 09, 2018 1:34 pm
Forum: Bronsted Acids & Bases
Topic: J.7
Replies: 2
Views: 190

J.7

For part b of J.7, we are supposed to find the neutralization reaction for zinc nitrite. How would you determine that Zn goes with OH-?
by Alysia Garcia 1B
Sat Jun 09, 2018 1:03 pm
Forum: Bronsted Acids & Bases
Topic: J.5
Replies: 2
Views: 193

J.5

For part b for J.5, we are given (CH3)3N + HNO3-->, why do these compounds combine to form (CH3)3NHNO3, how are we supposed to know to break it up on the right side or combine them? Also, for the ionic equation, why doesn't (CH3)3N break up? Is it because it is a weak acid and how would we know that...
by Alysia Garcia 1B
Sat Jun 09, 2018 12:33 pm
Forum: Bronsted Acids & Bases
Topic: J.1
Replies: 2
Views: 194

J.1

For this problem I'm having a hard time understanding why NH3 would be a base and H2SO3 would be an acid? Could someone help explain?
by Alysia Garcia 1B
Sat Jun 09, 2018 11:58 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 17.33
Replies: 1
Views: 95

17.33

Why would CO3^2- be a mono dentate? Why can the oxygen with the double bound not serve as a binding site?
by Alysia Garcia 1B
Sat Jun 09, 2018 11:27 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 17.29
Replies: 2
Views: 107

17.29

For this problem, we are supposed to find the oxidation number for coordination compound. The solution for part a shows that each ligand has a negative 1 charge but how would you find that? I tried to draw it out and I drew C bonded to N with a triple bond, with C also bonded to Fe and N with a lone...
by Alysia Garcia 1B
Sun Jun 03, 2018 4:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs
Replies: 7
Views: 212

Lone pairs

I know that an atom with a lone pair would cause more repulsion and therefore a smaller bond angle than normal but how does it cause this repulsion?
by Alysia Garcia 1B
Sun Jun 03, 2018 4:49 pm
Forum: Hybridization
Topic: strength of sigma and pi bonds
Replies: 10
Views: 391

strength of sigma and pi bonds

Would a sigma bond be stronger than a pi bond and why?
by Alysia Garcia 1B
Sun Jun 03, 2018 4:39 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Define Ligands?
Replies: 10
Views: 316

Re: Define Ligands?

What exactly is meant by "TM complex/organometallic complex/coordination compound"?
by Alysia Garcia 1B
Sun May 27, 2018 10:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: structure SF4
Replies: 2
Views: 82

structure SF4

For this molecule, why would the F atoms not be spread evenly around the S atom?
by Alysia Garcia 1B
Sun May 27, 2018 10:15 pm
Forum: Dipole Moments
Topic: dipole moments and polarization
Replies: 3
Views: 113

dipole moments and polarization

Would a molecule be polar if the dipole moments don’t cancel each other out? like why is water polar if there’s both a negative charge (on the oxygen) and positive charge (on the hydrogen atoms)?
by Alysia Garcia 1B
Sun May 27, 2018 10:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: lone pairs
Replies: 5
Views: 184

lone pairs

for there to be a 120 degree rather than a straight line the line pair must be on the middle electron? also how does this make the molecule angled?
by Alysia Garcia 1B
Mon May 21, 2018 10:50 am
Forum: Formal Charge and Oxidation Numbers
Topic: Low Energy
Replies: 2
Views: 180

Low Energy

For lewis structures that show one atom +1 and one -1, why is that not low in energy when they cancel each other out and equal 0?
by Alysia Garcia 1B
Mon May 21, 2018 10:47 am
Forum: Lewis Structures
Topic: 3.63 [ENDORSED]
Replies: 2
Views: 101

3.63 [ENDORSED]

For part d, it asks for the lewis structure of TeCl4. The solution shows Te, with a Cl on the sides and 2 more Cl below but none on top. Why is it set up this way and when do we have to know to do it this way?
by Alysia Garcia 1B
Mon May 21, 2018 10:44 am
Forum: Lewis Structures
Topic: Lewis Structure ClONO3 [ENDORSED]
Replies: 2
Views: 157

Lewis Structure ClONO3 [ENDORSED]

In the solutions, the lewis structure has a double bond connected from the N to one of the Os, but why would we have to use a double bond? It would still follow the octet rule without the double bond. When would have to know to use a double bond then to fill all the sides with electrons?
by Alysia Garcia 1B
Sun May 13, 2018 5:00 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Bonds
Replies: 4
Views: 166

Covalent Bonds

Why do we chose an atom with the lowest ionization energy as the central atom?
by Alysia Garcia 1B
Tue May 08, 2018 3:22 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Mechanics Worksheet #9 [ENDORSED]
Replies: 4
Views: 415

Re: Quantum Mechanics Worksheet #9 [ENDORSED]

If you search Sunday worksheet, all the worksheets should come up :)
by Alysia Garcia 1B
Mon May 07, 2018 9:59 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Module Question #17
Replies: 4
Views: 189

Module Question #17

For this question, I am just multiplying the speed of light by 1/100 by the mass of the electron (9.109x10^-31 kg) to find the uncertainty in momentum. This gave me 3x10^6 and then divided h/4pi by the number I found but I somehow am not getting any of the given answers. Does anyone know what error ...
by Alysia Garcia 1B
Mon May 07, 2018 9:01 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Mechanics Worksheet #9 [ENDORSED]
Replies: 4
Views: 415

Quantum Mechanics Worksheet #9 [ENDORSED]

For this problem, why would would b and d be impossible? I thought the ml values were in range.
quantum mechanics.png
by Alysia Garcia 1B
Sat May 05, 2018 5:49 pm
Forum: Quantum Numbers and The H-Atom
Topic: Midterm Review 6C
Replies: 1
Views: 126

Midterm Review 6C

For this question:
6. c) Which has a higher electron affinity, chlorine (Cl) or Neon (Ne)?
the answer was Cl because Ne is a noble gas but I'm confused on how that effects electron affinity.
by Alysia Garcia 1B
Sat May 05, 2018 5:41 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Significance of - sign
Replies: 2
Views: 171

Significance of - sign

For the equation, E=-hr/n^2, I'm still confused as why the negative sign is significant. Is it because when the electron is removed, the system's energy is 0, so the energy must be less than 0? Could someone explain this please? :)
by Alysia Garcia 1B
Sat May 05, 2018 5:36 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration exceptions [ENDORSED]
Replies: 1
Views: 74

Electron Configuration exceptions [ENDORSED]

I understand that Chromium and Cooper have exceptions because they are more stable with different configurations (like the normal configuration for copper is [Ar]3d104s1). But how would we apply that to their ions? ex: Cr+3
by Alysia Garcia 1B
Sat Apr 28, 2018 6:52 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron Spin [ENDORSED]
Replies: 4
Views: 143

Electron Spin [ENDORSED]

For the Stern and Gerlach experiment I understand how electrons can be spun up or down but what is the meaning of ms=+1/2 and ms=-1/2?
by Alysia Garcia 1B
Sat Apr 28, 2018 6:45 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: In class problem [ENDORSED]
Replies: 6
Views: 340

In class problem [ENDORSED]

For the problem we did in class, how would we determine if the outcome of uncertainty is an impossible outcome? the answer was 3.4x10^10 m/s.
by Alysia Garcia 1B
Sat Apr 28, 2018 6:37 pm
Forum: *Shrodinger Equation
Topic: Shrodinger Equation [ENDORSED]
Replies: 2
Views: 159

Shrodinger Equation [ENDORSED]

For the equation Hψ (n,m,ml)=Eψ (n,m,ml), what exactly does n,m,ml represent and how are they applied to the equation?
by Alysia Garcia 1B
Sat Apr 21, 2018 4:37 pm
Forum: DeBroglie Equation
Topic: Post-Assessment #34 [ENDORSED]
Replies: 5
Views: 184

Post-Assessment #34 [ENDORSED]

In this problem:
If an electron (mass 9.11 x 10-31 kg) has an associated wavelength of 7.28 x 10-9 m, what is its speed? Is your answer reasonable, why?
I got the answer 1x10^-5 m/s, but how would you determine if the speed is reasonable?
by Alysia Garcia 1B
Sat Apr 21, 2018 4:31 pm
Forum: DeBroglie Equation
Topic: DeBrogile Module
Replies: 6
Views: 200

DeBrogile Module

For this problem: Calculate the wavelength of a 275 kg single-seat electric car traveling at a speed of 125 km.hr-1. Do electric cars have wavelike properties? I converted the 125 km.hr-1 to meters per second then used that number for the velocity in the DeBrogile Equation but I'm still getting the ...
by Alysia Garcia 1B
Fri Apr 20, 2018 12:49 pm
Forum: Photoelectric Effect
Topic: Post-Assessment #31 [ENDORSED]
Replies: 2
Views: 143

Post-Assessment #31 [ENDORSED]

If 3.607 x 10-19 J is required to remove an electron with zero kinetic energy from a metal surface, what would be the longest wavelength light that could do this?
I understand that you have to use Ek= Energy of incoming photon - work function, but what would I use for the kinetic energy?
by Alysia Garcia 1B
Mon Apr 16, 2018 1:15 pm
Forum: Photoelectric Effect
Topic: 1.9
Replies: 6
Views: 179

1.9

For this problem, you are given the frequency 8.7x10^14 HZ. I understand that you have to divide that by the speed of light, 3.00x10^8 ms-1, to find the wavelength but how would you convert that to nm units?
by Alysia Garcia 1B
Mon Apr 16, 2018 12:14 pm
Forum: Photoelectric Effect
Topic: nm vs m
Replies: 3
Views: 144

nm vs m

In the video module on the photoelectric effect, he converts the wavelength in meters to pica meters. Do we always have to convert to pica meters when solving for a wavelength?
by Alysia Garcia 1B
Mon Apr 16, 2018 11:43 am
Forum: Photoelectric Effect
Topic: Determinant
Replies: 1
Views: 80

Determinant

I was not here for Friday's lecture on the photoelectric effect, could anyone explain what the determinant is?
by Alysia Garcia 1B
Fri Apr 06, 2018 12:31 pm
Forum: Limiting Reactant Calculations
Topic: M.5
Replies: 4
Views: 162

M.5

For this problem I understand how to find the excess reactant but how would you would how many moles of the excess reactant remain?
by Alysia Garcia 1B
Thu Apr 05, 2018 9:26 pm
Forum: Molarity, Solutions, Dilutions
Topic: G.5 part a [ENDORSED]
Replies: 3
Views: 126

Re: G.5 part a [ENDORSED]

Oh I didn't even see that! thank you!
by Alysia Garcia 1B
Thu Apr 05, 2018 6:54 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Homework E.9
Replies: 2
Views: 154

Re: Homework E.9

Thank you!
by Alysia Garcia 1B
Thu Apr 05, 2018 6:39 pm
Forum: Molarity, Solutions, Dilutions
Topic: G.5 part a [ENDORSED]
Replies: 3
Views: 126

G.5 part a [ENDORSED]

For part a, it asks what volume of solution is needed to obtain 2.15 mol of Na+ but in the solution they use 2.15 x 10^-3. Why would you use this number instead of the one given?
by Alysia Garcia 1B
Thu Apr 05, 2018 4:18 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Homework E.9
Replies: 2
Views: 154

Homework E.9

For part b on E.9, what are formula units?

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