Search found 11 matches

by 204280190
Mon Feb 08, 2016 11:42 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Midterm 2011 Q5
Replies: 1
Views: 272

Re: Midterm 2011 Q5

a) is in the format for the entropy which is Joules Kelvin-1 moles -1
while b) the delta G is for kilojoules
by 204280190
Mon Feb 08, 2016 11:39 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: delta S=0
Replies: 2
Views: 390

Re: delta S=0

Delta S=q rev/T for reversible situations.
by 204280190
Mon Feb 08, 2016 11:36 pm
Forum: Balancing Redox Reactions
Topic: Midterm 2014 Question 8
Replies: 4
Views: 530

Re: Midterm 2014 Question 8

I am still confused as to how we know which half reaction to flip. I was under the impression that a positive E value would be desired. Above is stated that a low negative value would be desired...would this not be accomplished by flipping the F2 equation instead of the HF.
by 204280190
Sat Feb 06, 2016 10:04 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell potential
Replies: 1
Views: 211

Cell potential

How does the negative or positive values either designate the half reaction as being electron donating or electron receiving. 14.6 page 579-580 is somewhat unclear to me!
by 204280190
Fri Feb 05, 2016 8:06 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: HW 11.11
Replies: 1
Views: 245

Re: HW 11.11

Is this for problem number 11.15? I have been doing this problem as stated in the solutions manual but my answer seems to differ from theirs stated.
But they used 1200K because that was what was stated for the K value in the question.
by 204280190
Thu Jan 28, 2016 6:20 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Kelvin vs. Celsuis
Replies: 2
Views: 343

Re: Kelvin vs. Celsuis

Keep in mind that the change in Kelvin is the same as the change in Celsuis.
by 204280190
Thu Jan 21, 2016 11:43 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Entropy and Spontaneous Reactions
Replies: 3
Views: 464

Re: Entropy and Spontaneous Reactions

Think of gases as they are constantly expanding. Thus with the volume increase comes an increase in entropy
by 204280190
Thu Jan 21, 2016 11:36 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Definition of degeneracy and relationship to entropy
Replies: 6
Views: 2556

Re: Definition of degeneracy and relationship to entropy

The formula kblnW for entropy and degeneracy is useful in theory but is not necessarily the best way to find Entropy. Use the other derived equations such as delta S=q/t and so on.
by 204280190
Thu Jan 21, 2016 11:20 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: value of n in w= -nRT*ln(V2/V1) vs. q=nCΔT
Replies: 2
Views: 1141

Re: value of n in w= -nRT*ln(V2/V1) vs. q=nCΔT

Keep in mind that nrtln(v2/v1) is derived from the ideal gas law (must be applied to ideal gases) while q=cdeltaT is for other substances
by 204280190
Sun Jan 10, 2016 3:49 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Calorimetry
Replies: 2
Views: 294

Re: Calorimetry

qcal=-q
this allows for one to find the heat from the heat capacity and temperature change and is directly linked back to the chemical equation.
by 204280190
Sat Jan 09, 2016 7:04 pm
Forum: Phase Changes & Related Calculations
Topic: Density as an Intensive Property
Replies: 1
Views: 967

Re: Density as an Intensive Property

Density is an intensive property because it does not depend upon the amount of the substance present. Mass is extensive while density is intensive

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