Search found 14 matches

by awolff_1D
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?
by awolff_1D
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)
by awolff_1D
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?
by awolff_1D
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?
by awolff_1D
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) ?
by awolff_1D
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?
by awolff_1D
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...
by awolff_1D
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?
by awolff_1D
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?
by awolff_1D
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!
by awolff_1D
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
by awolff_1D
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...
by awolff_1D
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?
by awolff_1D
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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