## Search found 11 matches

Sun Mar 13, 2016 2:02 pm
Forum: General Rate Laws
Replies: 1
Views: 305

I understand how to solve problems with the pre-equilibrium approach but could someone explain steady state to me? What is it and when would you use that approach?
Wed Mar 02, 2016 7:17 pm
Topic: Intermediates
Replies: 1
Views: 394

### Intermediates

If a questions asks for how many intermediates there are in a reaction mechanism, is it asking how many intermediate steps there are (for example, in a two step reactions, there is one intermediate step) or is it asking how many molecules are present in the intermediate step?
Wed Mar 02, 2016 7:12 pm
Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
Topic: Problem 1.16 and 1.17
Replies: 1
Views: 435

### Problem 1.16 and 1.17

In the organic chemistry textbook, the practice problems 1.16 and 1.17 show compounds that are composed of a carbon ring, two methyls and an additional iso/tert attachment. The answers give the methyls priority in the numbering and the iso/tert-butyl get higher numbers. I thought that whichever name...
Wed Mar 02, 2016 7:06 pm
Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
Topic: Iso and neo vs. sec and tert
Replies: 2
Views: 571

### Iso and neo vs. sec and tert

Could someone explain what situations would use iso and neo versus when to use sec and tert? I can't seem to understand the difference in terms of what the molecules look like (both iso and sec have three carbons and neo and tert have four carbons in the same configuration). Thanks!
Wed Feb 10, 2016 2:33 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneity
Replies: 2
Views: 437

### Re: Spontaneity

I was wondering about the difference between (delta)So and (delta)S total, rather than just the difference between (delta)So and simply (delta)S. I just don't really understand when you would use (delta)S total and how you would use the value to determine the spontaneity of a reaction. (For referenc...
Tue Feb 09, 2016 10:51 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneity
Replies: 2
Views: 437

### Spontaneity

In regards to determining the spontaneity of a reaction based on entropy, why are we unable to tell based on (delta)S(not) but are able to tell with (delta) S of the total reaction (specifically that if it is positive, the reaction is spontaneous). In other words, what is the real difference between...
Tue Feb 09, 2016 8:21 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Addition of Pt(s) in cell diagrams
Replies: 2
Views: 349

### Addition of Pt(s) in cell diagrams

Under what specific conditions do we need to add platinum to our cell diagrams? I had always assumed that if we just had any metal in the anode or the cathode, we wouldn't need to add platinum, but I've had a couple problems in which platinum was added even though the cathode/anode had a metal in it...
Tue Feb 09, 2016 8:17 pm
Forum: Balancing Redox Reactions
Topic: Homework Question 14.13
Replies: 1
Views: 298

### Homework Question 14.13

For part c, the question asks to balance the reaction: Cl2 (g) + H2 (g) --> HCl (aq). I wasn't sure how to solve this problem so I checked in the solutions manual and it creates two half reactions that split HCl up into H and Cl. I was hoping someone could explain to me why this is okay, and how to ...
Tue Feb 09, 2016 8:13 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox Reactions in basic solutions
Replies: 1
Views: 1109

### Balancing Redox Reactions in basic solutions

I can balance redox half reactions in acidic solutions pretty well, and tried to do the same in basic conditions but it seems to take much longer because we have to add both hydrogen and oxygen. I was wondering if there was a short cut or some kind of trick to make this easier and faster, as of righ...
Tue Jan 19, 2016 11:11 pm
Forum: Calculating Work of Expansion
Topic: Work Equation
Replies: 2
Views: 558

### Work Equation

Could someone explain why the work equation is w=(NEGATIVE)P delta v? I understand where everything comes from but I'm still having trouble grasping why the entire equation is negative.
Sun Jan 10, 2016 10:23 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpy of Formation
Replies: 2
Views: 354

### Standard Enthalpy of Formation

In the course reader on page 19, it says "by definition, the standard enthalpy of formation of an element in its most stable form is zero." Could someone explain this to me? I understand the basic idea of what a standard enthalpy of formation is but don't understand this concept.