## Search found 21 matches

Thu Mar 16, 2017 5:01 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Difference between cis and Z, and trans and E
Replies: 4
Views: 774

### Re: Difference between cis and Z, and trans and E

Isn't longest chain just referring to your longest carbon chain and the highest priority referring to the functional group attached to the molecule?
Sun Mar 12, 2017 10:55 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: Pseudo-equilibrium Constant
Replies: 1
Views: 718

### Re: Pseudo-equilibrium Constant

i believe the pseudo equilibrium constant describes equilibrium conditions at the transition states.
Sun Mar 05, 2017 7:48 pm
Forum: First Order Reactions
Topic: Determining Overall Reaction Rate
Replies: 3
Views: 354

### Re: Determining Overall Reaction Rate

To determine the overall order of the reaction, you have to add the individual reaction rates so I believe this would make your overall reaction a second order reaction because A is first order and so is B in this example.
Sat Feb 25, 2017 1:25 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Quiz 3 Question
Replies: 1
Views: 203

### Quiz 3 Question

Will the pages in our course reader that cover kinetics (the ones that were not included on quiz 2) be covered on Quiz 3 or will our last quiz just cover organic chemistry?
Sun Feb 19, 2017 1:41 pm
Forum: First Order Reactions
Topic: Quiz 2 prep #3
Replies: 4
Views: 455

### Re: Quiz 2 prep #3

The rate constant helps you determine the order of the reaction. You cannot just assume what the order of the reaction will be based on its balanced form and by looking at the stoichiometric coefficients.
Sat Feb 11, 2017 6:01 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Calculating K for reaction using half reactions [ENDORSED]
Replies: 4
Views: 471

### Re: Calculating K for reaction using half reactions[ENDORSED]

you flip the equation where flipping the E value will give you the largest most positive E value for your overall redox reaction.
Sat Feb 11, 2017 6:01 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Calculating K for reaction using half reactions [ENDORSED]
Replies: 4
Views: 471

### Re: Calculating K for reaction using half reactions[ENDORSED]

you flip the equation where flipping the E value will give you the largest most positive E value for your overall redox reaction.
Sat Feb 11, 2017 5:59 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: answers from bond enthalpies vs. standard of formation [ENDORSED]
Replies: 1
Views: 281

### answers from bond enthalpies vs. standard of formation[ENDORSED]

For calculating standard molar entropy changes using bond enthalpies and standards of formation values, we get similar but different answers. Is one more accurate than the other? How can we explain this difference?
Wed Feb 01, 2017 8:25 pm
Forum: Balancing Redox Reactions
Topic: Redox Reactions
Replies: 1
Views: 217

### Redox Reactions

After today's lecture I am still a little unclear on which reaction we need to flip the sign for. I understand that when you have two half reactions you will need to flip one to get the proper sign, but do you always flip the anode or does it depend on the situation?
Mon Jan 23, 2017 10:24 am
Forum: Student Social/Study Group
Topic: Quiz 1 Prep
Replies: 8
Views: 802

### Re: Quiz 1 Prep

I am interested!
Tue Jan 17, 2017 3:42 pm
Forum: Student Social/Study Group
Replies: 1
Views: 318

For chem 14A there was a book compiled of old midterm and final exams from previous years...is a similar book available for chem 14b this quarter? if so will it be sold at the same location as where we bought our course readers?
Sun Jan 15, 2017 8:23 pm
Forum: Phase Changes & Related Calculations
Topic: Changing States
Replies: 1
Views: 213

### Re: Changing States

I'm not exactly sure if there is a way to determine this precisely but I think you can look at a phase change diagram where the graph becomes horizontal and the molecule takes the form of both states (ex. both solid and liquid) and then see how long that horizontal line is. The length of the horizon...
Sun Nov 27, 2016 3:30 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Strong or weak? [ENDORSED]
Replies: 3
Views: 577

### Re: Strong or weak?[ENDORSED]

I think it is good to have them memorized, but we can also look at the equilibrium constants since weak bases have smaller equilibrium constants and we can also look at the values of pKb because weak bases have larger pKb values.
Wed Nov 16, 2016 4:25 pm
Forum: Lewis Acids & Bases
Topic: question regarding lecture today
Replies: 1
Views: 332

### question regarding lecture today

In class today while discussing HCl Dr. Lavelle said we wouldn't see the equilibrium constant for HCl but I didn't really understand the explanation. Why wouldn't we see the equilibrium constant?
Thu Nov 10, 2016 5:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Solids in Equilibrium Reactions
Replies: 1
Views: 221

### Re: Solids in Equilibrium Reactions

solids and liquids are not included in equilibrium reactions because of the fact that their concentrations do not change. Because their concentrations do not change, we do not include them in equilibrium reactions to make the problems easier to solve. the statement in the course reader that you list...
Fri Nov 04, 2016 9:53 am
Forum: Electronegativity
Topic: Problem 4.57
Replies: 3
Views: 648

### Re: Problem 4.57

Yes oxygen is an exception because when you compare it with Nitrogen, Nitrogen is more stable because it has a half filled shell while oxygen has 2 unpaired electrons. Oxygen would be okay with losing an electron to become half full like nitrogen is while nitrogen is very stable with its shell half ...
Thu Oct 27, 2016 7:30 pm
Forum: Resonance Structures
Topic: Resonance structures [ENDORSED]
Replies: 3
Views: 511

### Re: Resonance structures[ENDORSED]

yes, if a molecule has resonance that means it can be drawn in multiple ways. resonance structures have the same atoms involved but they differ by the use and location of bonds and lone pairs. resonance structures can be used to figure out the best visual representation of an atom (based on formal c...
Fri Oct 21, 2016 4:00 pm
Forum: Quantum Numbers and The H-Atom
Topic: Chapter 2 homework problem 47
Replies: 1
Views: 235

### Chapter 2 homework problem 47

In chapter 2 #47, I do not understand parts b and c. The problem gives the ground state of of atoms and asks us to predict the type of orbital from which an electron will be removed to form the +1 ion. part b gives you Mn (I thought it would be removed from the 3d but the correct answer is 4s.) part...
Thu Oct 13, 2016 7:29 pm
Forum: Significant Figures
Topic: sig figs in electronic transition problem
Replies: 5
Views: 476

### sig figs in electronic transition problem

If you are given a problem that tells you that an atom went through an electronic transition from two energy levels (for example n=3 to n=1 like in the practice quiz) but you are not given any more numerical information, how many sig figs do you use in your answer? is it one sig fig because the ener...
Fri Oct 07, 2016 12:31 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Homework Problems #11 and #15 [ENDORSED]
Replies: 4
Views: 579

### Re: Homework Problems #11 and #15[ENDORSED]

For the Lyman series, n=1 is the ground state. For the Balmer series, n=2 is the ground state. For number 15, the problem is using the lyman series so you know that n_initial=1. Now you can solve for your other n-value through calculator work and plugging in the values since you only have one unknow...
Fri Sep 30, 2016 2:46 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heizenberg Problem relating to location in nucleus
Replies: 1
Views: 278

### Heizenberg Problem relating to location in nucleus

If the questions states "demonstrate an electron cannot be located inside the nucleus of an atom," how are you supposed to prove this? I understand how to solve the problem (given the diameter of the atom as 1.7 x 10^-15 m) and I know how to solve for the velocity, but how do you relate th...