Search found 15 matches

by Anna Nordstrom 1A
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: 496

Re: Henderson-Hasselbalch Equation for Bases

The alternate form would be using the pOH and the pKb instead of the pH and pKa.
by Anna Nordstrom 1A
Sun Nov 29, 2015 1:30 pm
Forum: Conjugate Acids & Bases
Topic: Acid reactions
Replies: 1
Views: 364

Acid reactions

Will the reaction of a strong acid always result in H3O+ and the conjugate base or are there exceptions?
by Anna Nordstrom 1A
Fri Nov 20, 2015 9:05 pm
Forum: Lewis Acids & Bases
Topic: BF3 as a lewis acid
Replies: 1
Views: 849

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...
by Anna Nordstrom 1A
Wed Nov 11, 2015 3:21 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1123685

Re: Chemistry Jokes

Enjoy the joke!
by Anna Nordstrom 1A
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: 576

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...
by Anna Nordstrom 1A
Sun Nov 08, 2015 4:34 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Composition
Replies: 2
Views: 336

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!
by Anna Nordstrom 1A
Sun Nov 01, 2015 4:49 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Molecular Orbitals
Replies: 1
Views: 229

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?
by Anna Nordstrom 1A
Sun Nov 01, 2015 3:27 pm
Forum: Lewis Structures
Topic: Lewis Acids and Bases
Replies: 1
Views: 245

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 ...
by Anna Nordstrom 1A
Sun Nov 01, 2015 9:09 am
Forum: NEWS & RESOURCES
Topic: **Midterm Rooms and Review Sessions**
Replies: 7
Views: 7834

Re: **Midterm Rooms and Review Sessions**

Are there normal UA and TA office hours this week in addition to the review sessions?
by Anna Nordstrom 1A
Mon Oct 26, 2015 2:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Practice
Replies: 31
Views: 7830

Re: VSEPR Practice

Why is XeO3F2 nonpolar? Isn't there an extra O that doesn't "cancel out" with the others?
by Anna Nordstrom 1A
Thu Oct 22, 2015 8:06 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Nitrogen and Oxygen Bonding
Replies: 2
Views: 309

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.
by Anna Nordstrom 1A
Wed Oct 14, 2015 4:16 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 1
Views: 383

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...
by Anna Nordstrom 1A
Wed Oct 07, 2015 5:22 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions when writing e- configurations
Replies: 3
Views: 566

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...
by Anna Nordstrom 1A
Thu Oct 01, 2015 8:28 am
Forum: *Black Body Radiation
Topic: What is "black body radiation?"
Replies: 8
Views: 1181

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.
by Anna Nordstrom 1A
Thu Oct 01, 2015 8:25 am
Forum: Significant Figures
Topic: Rounding to 1 sig fig when there is a 5
Replies: 4
Views: 730

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 ...

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