Search found 25 matches

by Kendall_Chaffin_3C
Fri Mar 17, 2017 11:10 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: question about standard cell potential
Replies: 1
Views: 189

Re: question about standard cell potential

Ecell = cathode - anode when talking about standard reduction potentials. The -1.33 is the standard oxidation potential so if you want to use this formula you must make it positive first.
by Kendall_Chaffin_3C
Fri Mar 17, 2017 11:07 pm
Forum: *Cycloalkanes
Topic: Cycloalkanes
Replies: 1
Views: 369

Re: Cycloalkanes

Other alkanes have more angle strain. Each C-C bond wants to be roughly 109.5 degrees. With less that 5 Carbons each C-C bond angle is too big (ex: cyclopropanes C-C bonds are at 120 degrees) and with more than 6 carbons the C-C bond angle is too small (ex: cyclooctanes C-C bonds would be 45 degrees...
by Kendall_Chaffin_3C
Fri Mar 17, 2017 11:03 pm
Forum: Balancing Redox Reactions
Topic: 2013 Final Q3A
Replies: 1
Views: 197

Re: 2013 Final Q3A

the standard E values would have to be given
by Kendall_Chaffin_3C
Fri Mar 17, 2017 11:02 pm
Forum: *Alcohols
Topic: How does priority shift after the first priority has been completed?
Replies: 1
Views: 423

Re: How does priority shift after the first priority has been completed?

It would go down the priority chain.

functional groups > double and triple bonds > halogens > alkyl groups
by Kendall_Chaffin_3C
Fri Mar 17, 2017 11:00 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 2013 Final Q3C
Replies: 1
Views: 232

Re: 2013 Final Q3C

the pH of the solution is 2.0 and -log[H+] = pH so [H+] = 10^-2 = 0.01M
by Kendall_Chaffin_3C
Mon Mar 13, 2017 10:05 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: torsional strain vs steric strain
Replies: 1
Views: 250

torsional strain vs steric strain

what is the difference between torsional strain and steric strain?
by Kendall_Chaffin_3C
Thu Mar 09, 2017 8:35 pm
Forum: *Electrophiles
Topic: nucleophile vs electrophile
Replies: 2
Views: 506

nucleophile vs electrophile

Towards the end of class Lavelle was talking about how H2O is a nucleophile because it has valence electrons on the O but that .. if i remember correctly .. HO2 was an electrophile because of polarization? I'm still very confused by this could someone explain again? Also, is OH a nucleophile or an e...
by Kendall_Chaffin_3C
Fri Mar 03, 2017 5:21 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: Chapter 4 Question 30
Replies: 1
Views: 334

Chapter 4 Question 30

Chapter 4 Question 30 asks, the activation energy in an organic reaction if known to be 125 kj/mol. Will this reaction occur at room temperature. The answer is no but why?
by Kendall_Chaffin_3C
Fri Feb 24, 2017 9:13 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889376

Re: Post All Chemistry Jokes Here

What is the name of 007's Eskimo cousin?

Polar Bond
by Kendall_Chaffin_3C
Wed Feb 15, 2017 3:20 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 2015 Midterm Q4&5 part 3
Replies: 1
Views: 206

Re: 2015 Midterm Q4&5 part 3

When the system is irreversible S(surrounding) = 0 meaning S(system) = S(universe)
by Kendall_Chaffin_3C
Thu Feb 09, 2017 11:44 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: When to add Pt to a cell diagram
Replies: 1
Views: 197

When to add Pt to a cell diagram

Sometimes Pt is added at the end or beginning of the cell diagrams. Is this only added when there isn't another solid or is there another way to know when to add it?
by Kendall_Chaffin_3C
Tue Jan 31, 2017 9:39 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Finding C in Chapter 9 #19
Replies: 1
Views: 229

Re: Finding C in Chapter 9 #19

The gas constant, R, is multiplied by 5/2 to find C at a constant pressure. So you don't need to multiply C by 5/2
by Kendall_Chaffin_3C
Tue Jan 24, 2017 3:16 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Quiz 1 Prep Question 3
Replies: 1
Views: 256

Quiz 1 Prep Question 3

In Quiz 1 Prep Question 3 it asks: If 2.00 mol of an ideal gas at 300 K and 3.00 atm expands isothermally and reversibly from 6.00 L to 18.00 L and has a final pressure of 1.20 atm, what is w,q, and change in internal energy? I found w using w=-nRTln(V2/V1) but how do I find q without a change in te...
by Kendall_Chaffin_3C
Fri Jan 20, 2017 1:09 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Chapter 8 Problem 31
Replies: 1
Views: 309

Chapter 8 Problem 31

In the solution for problem 31 of chapter 8 it says the molar heat capacity of a monatomic ideal gas at constant pressure is C=5/2R and the molar heat capacity of a monatomic ideal gas at constant volume is C=3/2R. Where did the numbers 3/2 and 5/2 come from? Are these statements true for any problem?
by Kendall_Chaffin_3C
Fri Jan 13, 2017 2:31 pm
Forum: Phase Changes & Related Calculations
Topic: Homework Help 8.9
Replies: 4
Views: 374

Re: Homework Help 8.9

These two numbers are different forms of the gas constant and would be given to you on the exam. They are also on the sheet of equations on the back of the periodic table given to you when you bought your course reader.
by Kendall_Chaffin_3C
Tue Nov 29, 2016 10:27 am
Forum: Identifying Acidic & Basic Salts
Topic: Telling if oxides are acidic or basic
Replies: 1
Views: 341

Telling if oxides are acidic or basic

How do you tell if an oxide is acidic, basic, or amphoteric?

For example question 12.17 asks to state whether the following are acidic, basic, or amphoteric:
a. BaO
b. SO3
c. As2O3
d. Bi2O3
by Kendall_Chaffin_3C
Mon Nov 21, 2016 3:25 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889376

Re: Post All Chemistry Jokes Here

The optimist sees the glass half full. The pessimist sees the glass half empty. The chemist see the glass completely full, half in the liquid state and half in the vapor state. A proton and a neutron are walking down the street. The proton says, "Wait, I dropped an electron help me look for it....
by Kendall_Chaffin_3C
Sun Nov 20, 2016 9:09 pm
Forum: Bronsted Acids & Bases
Topic: Protonation [ENDORSED]
Replies: 2
Views: 325

Re: Protonation [ENDORSED]

Deprotonation is the the removal of a proton from an acid to form a conjugate base of that acid.
by Kendall_Chaffin_3C
Thu Nov 10, 2016 4:32 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889376

Re: Post All Chemistry Jokes Here

What do you do with a sick chemist?


Well, If you can't helium, and you can't curium, then you might as well barium!
by Kendall_Chaffin_3C
Fri Nov 04, 2016 9:43 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889376

Re: Post All Chemistry Jokes Here

Do you have 11 protons because you're sodium fine!
by Kendall_Chaffin_3C
Fri Oct 28, 2016 2:34 pm
Forum: Hybridization
Topic: Why do we hybridize?
Replies: 2
Views: 280

Re: Why do we hybridize?

Hybridized orbits are lower in energy and therefore more favorable then unhybridized orbitals. So hybridization occurs to create more stable compounds.
by Kendall_Chaffin_3C
Fri Oct 21, 2016 1:01 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Affinity
Replies: 6
Views: 589

Re: Electron Affinity

In the book it says electron affinities are higher towards the right of the periodic table. But, group 15 elements have lower ionization energies then group 14. Why is this?
by Kendall_Chaffin_3C
Thu Oct 13, 2016 6:02 pm
Forum: Quantum Numbers and The H-Atom
Topic: Electron Spin
Replies: 2
Views: 344

Re: Electron Spin

If the electron spin is +1/2 the arrow points up and if the election spin is -1/2 the arrow points down.
by Kendall_Chaffin_3C
Wed Oct 05, 2016 4:42 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Post Module Question #8/9 [ENDORSED]
Replies: 3
Views: 484

Post Module Question #8/9 [ENDORSED]

Question 8 states If one incorrectly assumed that an electron is located inside the nucleus of an atom, then for a hydrogen atom the electron is confined to its nuclear diameter of 1.7 x 10-15 m which would be the electron's uncertainty in position. Use the Heisenberg uncertainty equation to calcula...
by Kendall_Chaffin_3C
Thu Sep 29, 2016 3:58 pm
Forum: SI Units, Unit Conversions
Topic: Quiz preparation
Replies: 2
Views: 353

Quiz preparation

Do we need to know how to name compounds for quizzes? If so what polyatomic ions should we memorize? Also do we need to be familiar with the solubility guidelines?

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