## Search found 14 matches

Sat Mar 12, 2016 6:59 pm
Forum: *Electrophilic Addition
Topic: Electrophile Addition vs. SN2 Reaction
Replies: 2
Views: 1010

### Electrophile Addition vs. SN2 Reaction

What's the difference between an electrophile addition reaction and an SN2 reaction?
Sat Mar 12, 2016 1:16 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: gibbs free energy and stability
Replies: 1
Views: 352

### gibbs free energy and stability

Why are negative gibbs free energy values correlated to stability? (related to 9.63 from homework)
Sat Mar 12, 2016 1:15 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: HW 9.45
Replies: 1
Views: 245

### HW 9.45

Why is the answer of entropy=3.84 J/K the same for both parts (a) and (b) despite that (a) is irreversible and (b) is reversible?
Sat Mar 12, 2016 12:53 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: HW 9.45
Replies: 1
Views: 210

### HW 9.45

Why is the answer of entropy=3.84 J/K the same for both parts (a) and (b) despite that (a) is irreversible and (b) is reversible?
Sat Mar 12, 2016 12:09 am
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: HW 9.25
Replies: 1
Views: 269

### HW 9.25

In homework question 9.25, I understand why W=6, but why is it raised to 6.02 * 10^23 in the equation? Why isn't the equation entropy=kb*ln(6) ?
Sat Mar 05, 2016 1:46 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Consitutional Isomers Question
Replies: 2
Views: 366

### Consitutional Isomers Question

Can constitutional Isomers occur between a straight chain and a ring? Like they are isomers as long as their molecular formulas are the same?
Wed Feb 17, 2016 5:31 am
Forum: First Order Reactions
Topic: HW 15.37a
Replies: 1
Views: 277

### HW 15.37a

So for question 37 a, in the solutions manual, the equation to get time is ln(initial concentration/concentration)/k Why is it the natural log of the initial concentration divided by the concentration, and not the inverse of this? If you take the integrated first order equation in its normal form, i...
Tue Feb 09, 2016 11:17 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: HW 8.67 b
Replies: 1
Views: 249

### HW 8.67 b

From question 8.67 (b), in the solutions manual for the enthalpy of C(gr) multiplied (1mol)(717 KJ/mol). How/where did they get this value of 717?
Tue Feb 09, 2016 8:13 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: HW 14.9
Replies: 3
Views: 387

### HW 14.9

I understand how to use the equation to get gibbs free energy, but how do we determine which moles to use when we are given the whole balanced equation? In other words, if we are given E cell for the whole equation, how do we determine the moles to plug into the question?
Mon Feb 08, 2016 12:11 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Help with 14.27
Replies: 1
Views: 266

### Help with 14.27

Using data in Appendix 2B, calculate the standard potential for the half reaction: U (aq) (charge4+) +4 e- --> U (s)

Thanks!
Wed Jan 27, 2016 5:45 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpy calculation
Replies: 1
Views: 1813

### Bond Enthalpy calculation

Question 3 from the winter 2014 quiz:

Use the bond enthalpies given in the table below to estimate the reaction enthalpy for burning 1 mol of Butane:

C4H10 (g) + O2 (g) --> CO2 (g) + H20 (g)

Bond Mean bond enthalpy
C-H 412
C-C 348
O=O 496
C=O 743
O-H 463
Sat Jan 16, 2016 1:28 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Homeowork question 8.77
Replies: 1
Views: 607

### Homeowork question 8.77

Can someone help me with homework question 8.77? It reads: Benzene is more stable and less reactive than would be predicted from its Kekule structures. Use the mean bond enthalpies in Table 8.7 to calculate the lowering in molar energy when resonance is allowed between the Kekule structures of benze...
Sat Jan 09, 2016 7:20 pm
Forum: Phase Changes & Related Calculations
Topic: Open/Closed systems
Replies: 1
Views: 258

### Open/Closed systems

On question 8.1 e from the homework, why is a mercury thermometer a closed system, not an isolated system?
Fri Nov 27, 2015 9:37 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Video: Molecular Orbital Theory
Replies: 1
Views: 310

### Video: Molecular Orbital Theory

This video addresses question 107 from chapter 4 in the textbook.

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