## Search found 28 matches

Sat Dec 09, 2017 3:04 pm
Forum: Shape, Structure, Coordination Number, Ligands
Replies: 1
Views: 288

If a transition metal forms a coordination complex with a hexadentate, is it considered an octahedral complex? Or is it only an octahedral complex when 6 different ligands bind with the transition metal?
Wed Dec 06, 2017 3:14 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculations using ice box
Replies: 4
Views: 342

### Re: Calculations using ice box

Usually if the equilibrium constant K is less than 10 -3 , the addition or subtraction of x to/from your initial value is negligible. But keep in mind that you can only "ignore" x when it is being added to or subtracted from a constant. In other words, if K < 10 -3 and it is equal to (x)(x...
Tue Dec 05, 2017 2:10 pm
Forum: Bronsted Acids & Bases
Topic: Question J.5 [ENDORSED]
Replies: 2
Views: 350

### Re: Question J.5[ENDORSED]

Why is it, then, written as (CH3)3NHNO3 (aq) instead of (CH3)3NH+(aq) + NO3-(aq)?
Mon Dec 04, 2017 8:16 pm
Forum: Amphoteric Compounds
Topic: 12.17 [ENDORSED]
Replies: 9
Views: 1095

### Re: 12.17[ENDORSED]

Can someone explain why Bi2O3 is amphoteric? It's technically not listed as a metalloid on the periodic table.
Tue Nov 28, 2017 9:34 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Box Question
Replies: 1
Views: 151

### ICE Box Question

Hi everyone,
If the initial pressure/molar concentration of some reactants or products are not given, do we always assume these reactants or products are initially equal to 0?
Tue Nov 28, 2017 8:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K constant
Replies: 2
Views: 224

### Re: K constant

Include both gas and aqueous solution! Don't include solid or liquid.
Tue Nov 28, 2017 7:04 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: ordering Ligands
Replies: 1
Views: 175

### Re: ordering Ligands

Write the ligands of a formula in alphabetical order based on the atoms binding to the metal. For example, take diaammineaquatrichloro chromium (IV) ion. The formula is [NiCl 3 (NH 3 ) 2 (OH 2 )] + . The "C" in Cl precedes the "N" in NH 3 , and the "N" in NH 3 precedes ...
Tue Nov 28, 2017 3:21 pm
Forum: Ideal Gases
Topic: Kc to Kp Conversion
Replies: 5
Views: 528

### Re: Kc to Kp Conversion

When we say concentration = P/(RT), is "concentration" the molar concentration (Kc)?
Mon Nov 27, 2017 10:48 pm
Forum: Naming
Topic: Problem 17.31 d [ENDORSED]
Replies: 3
Views: 273

### Re: Problem 17.31 d[ENDORSED]

The solutions manual actually listed diaqua before bisoxalato. This is in alphabetical order because, disregarding prefixes, the a in aqua precedes the o in oxalato.
Mon Nov 27, 2017 12:03 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.11d
Replies: 2
Views: 189

### 4.11d

Hi everyone,
For 4.11d, the solutions manual says that the H-N-H and H-N-N bond angles are approximately 107º. Since the shape is trigonal pyramidal, why is the answer approximately 107º instead of saying slightly less than 109.5º? How do we know it's 107º?
Tue Nov 21, 2017 3:06 pm
Forum: Naming
Topic: 17.31d
Replies: 4
Views: 398

### Re: 17.31d

Why is water written as OH2 instead of H2O?
Sun Nov 19, 2017 4:16 pm
Forum: Hybridization
Topic: Pi Bonds
Replies: 3
Views: 340

### Re: Pi Bonds

Yes, pi bonds occur when there is a multiplicity of bonds. Hybridization is based on regions of electron density, not number of bonds, so the unhybridized orbitals form pi bonds.
Thu Nov 16, 2017 3:41 pm
Forum: Hybridization
Topic: Pi bonds
Replies: 4
Views: 311

### Re: Pi bonds

Pi bonds result from multiple bonds (double, triple, etc.), aka unhybridized oribtals. They're unhybridized because hybridization only takes into account regions of e- density, so the 2nd or 3rd bond doesn't "count" when calculating hybridization. Pi bonds bond on either side of the intern...
Wed Nov 08, 2017 11:04 am
Forum: Electronegativity
Topic: Polar or non polar [ENDORSED]
Replies: 4
Views: 409

### Re: Polar or non polar[ENDORSED]

Nonpolar covalent bonds do not have differences in electronegativity. Polar covalent bonds have differences in electronegativity < 2. (Ionic bonds have differences in electronegativity > 2). I was told in my discussion today that we don't have to memorize any specific electronegativity values. Just ...
Tue Nov 07, 2017 7:51 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Trends of Polarizing Power
Replies: 4
Views: 7080

### Re: Trends of Polarizing Power

To understand polarizing power, it might be helpful to first understand when an atom is highly polarizable. Atoms or ions are highly polarizable when their electron clouds can undergo a large distortion (they exert weak control over their outermost electrons). Therefore, large anions are highly pola...
Sat Nov 04, 2017 6:43 pm
Forum: Ionic & Covalent Bonds
Topic: Homework Prob 3.37
Replies: 2
Views: 182

### Homework Prob 3.37

Hi! Can someone explain how they figured out the answer to 3.37? It asks us to identify the element "E" in this Lewis structure, and E is said to be in Period 3.
Thu Nov 02, 2017 6:32 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Subshells
Replies: 3
Views: 313

### Re: Subshells

Hey! I think for this class, we will only need to know what subshell corresponds to l when l is less than or equal to 3 (so l = 0, 1, 2, 3 or s-, p-, d-, f-orbital). But, you're correct in the sense that if n > 4, then l will continue to have its greatest value at n - 1. However I don't think we nee...
Tue Oct 31, 2017 9:27 pm
Forum: Electronegativity
Topic: Electronegativity [ENDORSED]
Replies: 5
Views: 440

### Re: Electronegativity[ENDORSED]

And just to add on, the most electronegative atom is Fluorine instead of Neon because Neon is a noble gas and therefore doesn't "want" more electrons because it already has a filled valence shell.
Sat Oct 28, 2017 4:12 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: the quantum world [ENDORSED]
Replies: 1
Views: 204

### Re: the quantum world[ENDORSED]

Recall that ∆p = m∆v. "∆v" means that we are looking for the overall range in which the velocity could be. Therefore, if the velocity is 5.3 +- .05, then v could either be 5.25 or 5.35, making ∆v = 5.35 - 5.25 = 0.1 m.s^-1 You said that the mass is given, so you would plug in the mass and ...
Tue Oct 24, 2017 11:38 am
Forum: *Shrodinger Equation
Topic:
Replies: 4
Views: 474

### Hψ

Hi everyone!

Can some please explain to me what exactly Hψ represents in the Schrodinger equation and how it can be equal to Eψ?

Thanks :)
Fri Oct 20, 2017 11:42 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Aufbau Principle - Carbon
Replies: 2
Views: 749

### Aufbau Principle - Carbon

Hi everyone, Today in lecture Dr. Lavelle used carbon as an example for showing the Aufbau Principle, or the Building-Up Principle. Here are my notes from it: Carbon (C) Z = 6 1s2 2s2 2px1 2py1 2p ↑ ↑ _ 2s ⇅   1s ⇅ - Add Z e- with no more than 2 e- per orbital (Pauli Exclusion Principle) - If more t...
Tue Oct 17, 2017 10:42 am
Forum: DeBroglie Equation
Topic: Fig 1.19
Replies: 2
Views: 260

### Re: Fig 1.19

Ramya, that makes SO much more sense! Thank you so much. :-)
Mon Oct 16, 2017 4:01 pm
Forum: DeBroglie Equation
Topic: Fig 1.19
Replies: 2
Views: 260

### Fig 1.19

Can someone please explain Fig 1.19 on pg. 157 in the textbook?

I'm especially confused by the visual difference between constructive and destructive interference in this diagram as well as the cause of the bright lines formed on the screen to the far right.

Thanks!
Fri Oct 13, 2017 11:49 am
Forum: Einstein Equation
Topic: Discussion Section Problem
Replies: 2
Views: 266

### Re: Discussion Section Problem

I think if you are given the frequency v, you can just use the equation E = hv, which would just be Planck's constant (h) multiplied by 8.7x 10^14 Hz. I don't think you'd even have to do the extra work to find the wavelength but maybe I'm misunderstanding!
Wed Oct 11, 2017 10:12 am
Forum: Photoelectric Effect
Topic: Photoelectric Effect: Post Module Assessment Q. 28, 29, and 30
Replies: 12
Views: 822

### Re: Photoelectric Effect: Post Module Assessment Q. 28, 29, and 30

Do you always plug in the mass of an electron as 9.10939 x 10-^31 kg for the kinetic energy equation 1/2mv^2?
Thu Oct 05, 2017 9:40 pm
Forum: Limiting Reactant Calculations
Topic: M.15 (b)
Replies: 2
Views: 248

### Re: M.15 (b)

You could do it either way! The solutions manual chose to calculate the grams of AlCl3 produced from both reactants, and then determined the limiting reactant as the one which produced the least amount of AlCl3. But you could also calculate the moles of Cl2 and Al respectively, determine the limitin...
Tue Oct 03, 2017 10:04 pm
Forum: SI Units, Unit Conversions
Topic: Appendix 1D & 1E
Replies: 3
Views: 269