Search found 19 matches
- Wed Mar 15, 2017 10:56 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Standard Cell Potential
- Replies: 4
- Views: 505
Standard Cell Potential
For the reaction, 2H+(aq) + 2e- yields H2(g), why is the standard cell potential 0?
- Thu Mar 09, 2017 1:56 am
- Forum: *Free Energy of Activation vs Activation Energy
- Topic: Catalysts vs. Enzymes
- Replies: 1
- Views: 903
Catalysts vs. Enzymes
In the course reader it says, "Catalysts and enzymes lower free energy of transition states and increase k."
What's the difference between a catalyst and an enzyme?
What's the difference between a catalyst and an enzyme?
- Fri Mar 03, 2017 10:32 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 7951
- Views: 1213262
Re: Post All Chemistry Jokes Here
Do you know any jokes about sodium?
Na
Na
- Thu Feb 23, 2017 3:19 pm
- Forum: Second Order Reactions
- Topic: Problem 15.27 vs. 15.35
- Replies: 1
- Views: 277
Problem 15.27 vs. 15.35
For questions 27 and 35 in Chapter 15 in the textbook, they both ask for the time needed for the concentration of a half-life reaction to decrease the concentration of A to a specific amount. However, question 27 is in first-order while questions 35 is in second-order. For first-order, if it asked f...
- Mon Feb 13, 2017 9:34 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 2018 Midterm Question 5A
- Replies: 1
- Views: 235
2018 Midterm Question 5A
Question: A standard electrochemical cell is made by placing a silver electrode into a 1.0 M Ag+ solution and a cadmium electrode into a 1.0 M Cd2+ solution. What is the redox reaction and what is the maximum potential produced by this cell? I confused how to figure out whether Ag or Cd is being red...
- Thu Feb 09, 2017 12:25 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Potential Difference
- Replies: 1
- Views: 243
Potential Difference
On page 45 of the course reader, it talks about potential difference between electrodes. Can someone explain in depth what that means?
- Fri Feb 03, 2017 3:29 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Equation
- Replies: 1
- Views: 254
Equation
For the equation, deltaS=nRln(V2/V1), does the final volume represent V2? Because in the solutions manual, sometimes V2 stood for the initial volume.
- Fri Jan 27, 2017 8:08 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Problem 8.57
- Replies: 2
- Views: 372
Problem 8.57
I was looking in the solutions manual for problem 57 and I was curious to know how they got the equations for C2H2, C2H6, and H2? Were we just supposed to know them? These equations were used to calculate enthalpy using Hess's Law.
- Fri Jan 20, 2017 10:19 am
- Forum: Calculating Work of Expansion
- Topic: Work of Expansion and Compression
- Replies: 4
- Views: 487
Work of Expansion and Compression
Can someone explain the concept of work of expansion and work of compression when the moles of the reactants and products of gas are different?
- Fri Jan 13, 2017 12:14 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Most Stable Form
- Replies: 4
- Views: 1038
Most Stable Form
For the standard enthalpy of formation of elements, do the ones in most stable form that equal 0 only include N2, O2, Cl2, Br2, and I2?
- Wed Nov 30, 2016 2:41 pm
- Forum: Polyprotic Acids & Bases
- Topic: Strong Acids and Bases
- Replies: 2
- Views: 573
Strong Acids and Bases
For determining whether an acid/base is strong, is there a way to know if it completely ionizes?
Mono
When is it necessary to use the prefix mono- when naming a coordination compound?
- Sun Nov 13, 2016 2:55 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Calculating K
- Replies: 4
- Views: 431
Calculating K
When calculating the equilibrium constant, what do you do if one of the reactants or products are a liquid or solid?
- Mon Nov 07, 2016 5:22 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 1
- Views: 244
Hybridization
How do you know when to hybridize and when something doesn't need to be hybridized?
- Thu Oct 27, 2016 2:19 am
- Forum: Ionic & Covalent Bonds
- Topic: Ionic and Covalent Character
- Replies: 5
- Views: 10574
Ionic and Covalent Character
What is the difference between ionic and covalent character and how do we determine strength of each of them? Do we use the periodic table?
- Fri Oct 21, 2016 2:36 pm
- Forum: Lewis Structures
- Topic: Lewis Structure regarding the angles
- Replies: 2
- Views: 379
Lewis Structure regarding the angles
For the trigonal planar, if the elements around the central are are different, how can you determine the angle of the atoms? For example, an atom makes the angle from the other atoms bigger.
- Fri Oct 14, 2016 1:31 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg constant
- Replies: 2
- Views: 532
Rydberg constant
On the equation sheet, the Rydberg constant is equal to 3.28984*10^15, but on the fall 2014 quiz 1 preparation, the answer for question 10 said otherwise. It uses an equation where R is equal to -2.178*10^-18. Why are there two values for this constant and which one am I supposed to use?
- Wed Oct 05, 2016 2:27 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Atomic vs. Molecular spectroscopy [ENDORSED]
- Replies: 1
- Views: 2715
Atomic vs. Molecular spectroscopy [ENDORSED]
What is the difference between atomic spectroscopy and molecular spectroscopy?
- Fri Sep 30, 2016 2:30 am
- Forum: Empirical & Molecular Formulas
- Topic: Rounding
- Replies: 1
- Views: 675
Rounding
When calculating an empirical formula, when is it okay to round up? For section F, number 11b in the homework problems, it asks to find the empirical formula of a compound used to generate O2 gas in a laboratory has the mass percentage composition 31.91% K and 28.93% Cl, the remainder being oxygen. ...