Search found 19 matches

by Tiffany Wu 1K
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?
by Tiffany Wu 1K
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?
by Tiffany Wu 1K
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
by Tiffany Wu 1K
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...
by Tiffany Wu 1K
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...
by Tiffany Wu 1K
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?
by Tiffany Wu 1K
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.
by Tiffany Wu 1K
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.
by Tiffany Wu 1K
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?
by Tiffany Wu 1K
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?
by Tiffany Wu 1K
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?
by Tiffany Wu 1K
Fri Nov 18, 2016 9:22 pm
Forum: Naming
Topic: Mono
Replies: 2
Views: 364

Mono

When is it necessary to use the prefix mono- when naming a coordination compound?
by Tiffany Wu 1K
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?
by Tiffany Wu 1K
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?
by Tiffany Wu 1K
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?
by Tiffany Wu 1K
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.
by Tiffany Wu 1K
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?
by Tiffany Wu 1K
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?
by Tiffany Wu 1K
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. ...

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