Search found 11 matches

by dyyjenny
Sun Feb 28, 2016 9:33 pm
Forum: *Cycloalkanes
Topic: Exercise 1.16 Numbering Carbons in Parent Chain
Replies: 6
Views: 1046

Re: Exercise 1.16 Numbering Carbons in Parent Chain

If you were to use the IUPAC name, it would be 2-(1 methylethyl)-1,1-dimethylcyclopentane
by dyyjenny
Mon Feb 08, 2016 10:07 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Irreversible expansion constant volume vs constant temperatu
Replies: 1
Views: 255

Irreversible expansion constant volume vs constant temperatu

For irreversible expansion, the ideal gas constant for pressure under constant temperature is 5/2R and 3/2r for constant volume, but how do we know which one to use? For example, when the temperature increases from 18.5 degree Celsius to 28.1 degree Celsius during irreversible expansion, why are we ...
by dyyjenny
Sun Feb 07, 2016 2:19 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: 14.33b Using Half Reactions to Calculate Ecell
Replies: 1
Views: 435

14.33b Using Half Reactions to Calculate Ecell

For 33 b, the half reactions they provided are Tl+ -> Tl 3+ + 2e- and Tl+ +2e- -> Tl, but when they calculated delta G, the first equation becomes Tl -> TL3+ +3e-, why is there a change?I know that the delta G for this half reaction is calculated earlier, but why is it that we can use this half reac...
by dyyjenny
Sun Feb 07, 2016 12:27 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 15a cell diagram order
Replies: 1
Views: 280

15a cell diagram order

Is there a specific order in arranging the components of a cell diagram? I know that anode is followed by cathode, but when theres three parts like in 15a, how do you arrange Ag, AgBr, and Br-?
by dyyjenny
Sat Feb 06, 2016 10:40 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 14.11 Balancing OH-, O2 and, H+
Replies: 2
Views: 617

14.11 Balancing OH-, O2 and, H+

Why is it that the anode is 2H20 -> O2+4H+ while the cathode is o2+2H2O -> 4OH-? How do we know where to put H2O in the equation, why isn't for the cathode that the final product is H2O as well?
by dyyjenny
Thu Jan 21, 2016 10:08 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Reversible vs Irreversible Process
Replies: 2
Views: 486

Reversible vs Irreversible Process

I know that in reversible process, there are small increases in volume, and in irreversible processes, the volume change is the opposite. But I'm not sure, for irreversible process and reversible process, which variable stayS the same (which one has constant pressure and which has constant temperatu...
by dyyjenny
Sat Jan 16, 2016 9:57 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 3
Views: 588

Re: Hess's Law

But isn't H2 also a diatomic molecule? The solution manual considers it in question 57
by dyyjenny
Sat Jan 16, 2016 9:15 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 3
Views: 588

Hess's Law

What are the molecules whose delta H can be considered as 0 during a Hess's law question? In other words, why is it that on question 57, the question considers H2 in the hydrogenation, but in another question calculating reaction standard enthalpy (4HNO3+5N2H4-->7N2+12H2O) the N2 is not considered?
by dyyjenny
Thu Jan 14, 2016 10:55 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.47 bond enthalpy
Replies: 1
Views: 317

8.47 bond enthalpy

For 8.47, part a, in the last step, where the heat required to perform the reaction is divided by the standard reaction enthalpy, (-1.056*10^3 kj/-5471kj*mol^-1) why is the heat required to perform the reaction negative? I know that the standard reaction enthalpy is negative because it is an endothe...
by dyyjenny
Tue Jan 12, 2016 12:56 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.21 heat capacity calculation
Replies: 1
Views: 357

8.21 heat capacity calculation

For 8.21 the question says a piece of cooper of mass 20.0 g at 100C is placed in a vessel of negligible heat capacity but containing 50.7g of water at 22.0C. Calculate the final temperature of the water. Assume that there is no energy lost to the surrounding. I understand that the heat lost of the c...
by dyyjenny
Sat Jan 09, 2016 6:18 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Constant Volume and Pressure Difference
Replies: 1
Views: 312

Re: Constant Volume and Pressure Difference

specific heat capacities at constant pressure and at constant volume are different only in the case of gases, and for liquids and solids, there is only one specific heat. In gases, the specific heat capacity under constant volume can be measured when heating up a gas in a container with a sealed and...

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