## Search found 16 matches

Thu Mar 10, 2016 11:37 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Residual Entropy
Replies: 3
Views: 496

### Residual Entropy

Under which conditions do we use the equation S=nRlnW to calculate residual entropy?
Thu Mar 10, 2016 3:41 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Interpreting activation energy from a graph
Replies: 1
Views: 404

### Interpreting activation energy from a graph

In the second graph on page 81 of the course reader, the steeper line (with a more negative slope) is labeled as having a high activation energy, whereas the less steep line (with the less negative slope) is labeled as having low activation energy. Why is this the case?
Wed Mar 09, 2016 11:33 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: E in the Nernst Equation
Replies: 1
Views: 180

### E in the Nernst Equation

When using the Nernst equation, under what conditions are Ecell and E^(degree sign) equal to 0?
Sun Mar 06, 2016 8:08 pm
Forum: General Rate Laws
Topic: Winter 2011 Final, Q4b
Replies: 1
Views: 287

### Winter 2011 Final, Q4b

Why is the M in the denominator raised to the (n-1) power?
Sun Mar 06, 2016 7:51 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Winter 2011 Final, Q3D
Replies: 1
Views: 237

### Winter 2011 Final, Q3D

Why is the maximum work of a battery equal to delta G only when temperature and pressure are constant?
Mon Feb 29, 2016 6:37 pm
Forum: *Organic Reaction Mechanisms in General
Topic: SN1 vs. SN2
Replies: 1
Views: 352

### SN1 vs. SN2

What is the best way to determine whether a reaction is SN1 or SN2?
Fri Feb 26, 2016 9:41 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Arrhenius Constant
Replies: 1
Views: 305

### Arrhenius Constant

When we need to use the Arrhenius equation, will the Arrhenius constant (A) always be given to us? On homework problem 4.30 from the organic textbook, we are asked to determine whether or not a reaction will occur at room temp, without being given the Arrhenius constant. Is this something we should ...
Tue Feb 09, 2016 3:49 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Idean's Review Handout, Example 5
Replies: 1
Views: 324

### Idean's Review Handout, Example 5

Did anyone who went to Idean's review session last Thursday complete Example 5? Which equation did you use to calculate work in part b?
Tue Feb 09, 2016 3:11 am
Forum: Phase Changes & Related Calculations
Topic: Winter 2013 Midterm Q2A.
Replies: 4
Views: 619

### Winter 2013 Midterm Q2A.

In calculating the q(ice) in this problem, why is the Csp for water (4.184 J/Cg) used, instead of the Csp for ice? Is this a mistake?
Thu Feb 04, 2016 4:32 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Variations of the Nernst Equation
Replies: 1
Views: 194

### Variations of the Nernst Equation

On page 587 of the textbook, there are two simplifications of equation (6a). When should we use (6b), and when should we use (6c)?
Tue Feb 02, 2016 9:50 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 14.13 part c
Replies: 1
Views: 265

### 14.13 part c

Why does the cell diagram for part C contain H+ and Cl- when the overall cell equation only contains H2, Cl2, and 2HCl?
Tue Feb 02, 2016 9:29 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 1
Views: 290

### Cell Diagrams

When is it necessary to include Pt(s) in a cell diagram?
Fri Jan 29, 2016 12:00 pm
Forum: Balancing Redox Reactions
Topic: Identifying anodes and cathodes
Replies: 2
Views: 376

### Identifying anodes and cathodes

What is the best way to identify which value is the cathode and which is the anode?
Sat Jan 23, 2016 10:09 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Delta H and q
Replies: 1
Views: 281

### Delta H and q

How do we know when to set Delta H equal to q? Are these values always equal? Which types of calculations involve doing so?
Mon Jan 18, 2016 8:33 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Example 9.6 in Textbook
Replies: 1
Views: 241

### Example 9.6 in Textbook

In Example 9.6, Step 3 involves cooling the acetone vapor back down from its boiling point. Why is this step necessary, and why must the entropy of this step be counted when calculating the overall entropy of the process?
Fri Jan 08, 2016 1:20 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Open, Closed, and Isolated Systems
Replies: 1
Views: 1490

### Open, Closed, and Isolated Systems

How exactly do a refrigerator coil and coolant work, and why is this considered a closed system?