## Search found 25 matches

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: 253

### 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.
Fri Mar 17, 2017 11:07 pm
Forum: *Cycloalkanes
Topic: Cycloalkanes
Replies: 1
Views: 637

### 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...
Fri Mar 17, 2017 11:03 pm
Forum: Balancing Redox Reactions
Topic: 2013 Final Q3A
Replies: 1
Views: 273

### Re: 2013 Final Q3A

the standard E values would have to be given
Fri Mar 17, 2017 11:02 pm
Forum: *Alcohols
Topic: How does priority shift after the first priority has been completed?
Replies: 1
Views: 673

### 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
Fri Mar 17, 2017 11:00 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 2013 Final Q3C
Replies: 1
Views: 298

### Re: 2013 Final Q3C

the pH of the solution is 2.0 and -log[H+] = pH so [H+] = 10^-2 = 0.01M
Mon Mar 13, 2017 10:05 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: torsional strain vs steric strain
Replies: 1
Views: 349

### torsional strain vs steric strain

what is the difference between torsional strain and steric strain?
Thu Mar 09, 2017 8:35 pm
Forum: *Electrophiles
Topic: nucleophile vs electrophile
Replies: 2
Views: 800

### 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...
Fri Mar 03, 2017 5:21 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: Chapter 4 Question 30
Replies: 1
Views: 426

### 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?
Fri Feb 24, 2017 9:13 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8205
Views: 1433593

### Re: Post All Chemistry Jokes Here

What is the name of 007's Eskimo cousin?

Polar Bond
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: 284

### Re: 2015 Midterm Q4&5 part 3

When the system is irreversible S(surrounding) = 0 meaning S(system) = S(universe)
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: 285

### 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?
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: 308

### 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
Tue Jan 24, 2017 3:16 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Quiz 1 Prep Question 3
Replies: 1
Views: 321

### 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...
Fri Jan 20, 2017 1:09 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Chapter 8 Problem 31
Replies: 1
Views: 369

### 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?
Fri Jan 13, 2017 2:31 pm
Forum: Phase Changes & Related Calculations
Topic: Homework Help 8.9
Replies: 4
Views: 545

### 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.
Tue Nov 29, 2016 10:27 am
Forum: Identifying Acidic & Basic Salts
Topic: Telling if oxides are acidic or basic
Replies: 1
Views: 436

### 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
Mon Nov 21, 2016 3:25 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8205
Views: 1433593

### 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....
Sun Nov 20, 2016 9:09 pm
Forum: Bronsted Acids & Bases
Topic: Protonation [ENDORSED]
Replies: 2
Views: 421

### Re: Protonation[ENDORSED]

Deprotonation is the the removal of a proton from an acid to form a conjugate base of that acid.
Thu Nov 10, 2016 4:32 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8205
Views: 1433593

### 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!
Fri Nov 04, 2016 9:43 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8205
Views: 1433593

### Re: Post All Chemistry Jokes Here

Do you have 11 protons because you're sodium fine!
Fri Oct 28, 2016 2:34 pm
Forum: Hybridization
Topic: Why do we hybridize?
Replies: 2
Views: 395

### 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.
Fri Oct 21, 2016 1:01 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Affinity
Replies: 6
Views: 792

### 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?
Thu Oct 13, 2016 6:02 pm
Forum: Quantum Numbers and The H-Atom
Topic: Electron Spin
Replies: 2
Views: 425

### 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.
Wed Oct 05, 2016 4:42 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Post Module Question #8/9 [ENDORSED]
Replies: 3
Views: 690

### 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...
Thu Sep 29, 2016 3:58 pm
Forum: SI Units, Unit Conversions
Topic: Quiz preparation
Replies: 2
Views: 453

### 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?