Search found 14 matches
- Thu Dec 03, 2015 12:28 pm
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: Henderson-Hasselbalch Equation for Bases
- Replies: 1
- Views: 838
Re: Henderson-Hasselbalch Equation for Bases
The alternate form would be using the pOH and the pKb instead of the pH and pKa.
- Sun Nov 29, 2015 1:30 pm
- Forum: Conjugate Acids & Bases
- Topic: Acid reactions
- Replies: 1
- Views: 573
Acid reactions
Will the reaction of a strong acid always result in H3O+ and the conjugate base or are there exceptions?
- Fri Nov 20, 2015 9:05 pm
- Forum: Lewis Acids & Bases
- Topic: BF3 as a lewis acid
- Replies: 1
- Views: 2032
Re: BF3 as a lewis acid
If you draw out the lewis structure for BF3, you will get the Boron in the center with the three Fluorine's coming off of it. All of the Fluorine's have a full valance electron shell but the Boron only has the three Fluorines coming off of it, and therefore only has 6 electrons in its outer shell. T...
- Wed Nov 11, 2015 3:21 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3591702
Re: Chemistry Jokes
Enjoy the joke!
- Wed Nov 11, 2015 2:51 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Creating a "new initial" for the ICE box (Q 11.67)
- Replies: 3
- Views: 880
Creating a "new initial" for the ICE box (Q 11.67)
Question 11.67 says: The reaction 2HlL(g) = H 2 (g)+Cl 2 (g) has K=3.2x10 -34 at 298 K. The initial partial pressures are H 2 , 1.0 bar; HCl 2.0 bar; and Cl 2 3.0 bar. At equilibrium there is 1.0 mol H2(g). What is the volume of the container? In the answer booklet they push the reaction to the left...
- Sun Nov 08, 2015 4:34 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Equilibrium Composition
- Replies: 2
- Views: 619
Equilibrium Composition
On page 125 of our course reader the example problem, it says .150 mole of NH3 is formed but the concentration of N2 is decreased by half that amount. The constants are 1N2+ 3H2=2NH3 so I know the numbers had to be adjusted for the molar ratios but I am still a little unsure how.
Thanks!
Thanks!
- Sun Nov 01, 2015 4:49 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Molecular Orbitals
- Replies: 1
- Views: 476
Molecular Orbitals
On page 17 and 19 of the CR, the diagrams for the molecular orbitals are slightly different- the sigma Pz orbital has been moved. In what instance would we use each diagram?
- Sun Nov 01, 2015 3:27 pm
- Forum: Lewis Structures
- Topic: Lewis Acids and Bases
- Replies: 1
- Views: 405
Lewis Acids and Bases
The 2014 midterm question 2B asks whether the Al atom in aluminum chloride is a Lewis Acid or base. Are we responsible for Lewis Acids and Bases on our midterm? Also, on the same question, it asks to draw the Lewis structure for aluminum chloride without giving the formula AlCl3. Should we memorize ...
- Mon Oct 26, 2015 2:46 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Practice
- Replies: 31
- Views: 14892
Re: VSEPR Practice
Why is XeO3F2 nonpolar? Isn't there an extra O that doesn't "cancel out" with the others?
- Thu Oct 22, 2015 8:06 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Nitrogen and Oxygen Bonding
- Replies: 2
- Views: 595
Nitrogen and Oxygen Bonding
If you bond N with O you get N=O with four electrons on the O and three on the N. The electrons are not completely balanced so what shape would it make? It's not quite linear but it's also not quite anything else.
- Wed Oct 14, 2015 4:16 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 1
- Views: 636
Formal Charge
I know that FC=V-(L+ S/2) and that having a formal charge of 0 is the most stable. Sometimes you can make a lewis structure that has a FC of 0 or a different number. The ideal structure would be the one with the FC of 0 so does this mean that this is the most common way that the molecule is found in...
- Wed Oct 07, 2015 5:22 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Exceptions when writing e- configurations
- Replies: 3
- Views: 829
Exceptions when writing e- configurations
The electron configuration for Copper is an exception so it is [Ar]3d^10 4s^1. If Copper gained an electron, would it be added back to 4s to make it [Ar]3d^10 4s^2? Also, in lecture we were discussing how if you lose an electron, you remove the most recent electron you drew or the outermost e-. Does...
- Thu Oct 01, 2015 8:28 am
- Forum: *Black Body Radiation
- Topic: What is "black body radiation?"
- Replies: 8
- Views: 2129
Re: What is "black body radiation?"
A "Black Body" is a hypothetical substance that absorbs all light, regardless of frequency or angle that it is entering at. Black Body radiation is the radiation that would come from this hypothetical substance.
- Thu Oct 01, 2015 8:25 am
- Forum: Significant Figures
- Topic: Rounding to 1 sig fig when there is a 5
- Replies: 4
- Views: 1180
Re: Rounding to 1 sig fig when there is a 5
The rounding rules with the number 5 are a little different. You round to the nearest EVEN number. For example, if I have .85 and I am rounding to one sig fig it would round to .8 If I had .35 and I was rounding to one sig fig it would round to .4 because .4 is the nearest even number. In this case ...