Search found 31 matches

by PriyaKohli3B
Sun Mar 13, 2016 9:12 pm
Forum: *Alkenes
Topic: Two different geometric isomers
Replies: 1
Views: 349

Re: Two different geometric isomers

Yes it is! If you have to double bonds within the carbon chain! You would need to identify cis and trans for both double bonds!
by PriyaKohli3B
Fri Mar 11, 2016 1:58 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Why is heat of vaporization not considered in this problem?
Replies: 2
Views: 321

Re: Why is heat of vaporization not considered in this probl

Yes! Since it is required to boil it is just the amount of heat needed to get to boiling point. Vaporization would occur at anything above 100 degrees celsius the difference comes from the wording, if it had said vaporize we would use the enthalpy of vaporization but since it says to boil we can omi...
by PriyaKohli3B
Sun Mar 06, 2016 4:22 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Determing salt bridge
Replies: 4
Views: 613

Re: Determing salt bridge

Yes you can use copper, that is a common one to use!
by PriyaKohli3B
Sun Feb 28, 2016 5:02 pm
Forum: *Cycloalkanes
Topic: naming cycloalkanes
Replies: 1
Views: 425

naming cycloalkanes

In our homework page 40 problem number 16, I am very confused as to how to name cycloalkanes. What gets priority when we are numbering? Also do we have to name the common names for the quiz or will the IUPAC names be sufficient?
by PriyaKohli3B
Sun Feb 21, 2016 3:00 pm
Forum: *Nucleophiles
Topic: Stability of nucleophiles
Replies: 1
Views: 322

Re: Stability of nucleophiles

Not necessarily, Br2 is the most stable form of Br as that is the one found in nature Br- is the ion and because of this it is unstable and acts as a nucleophile binding to electrophiles.
by PriyaKohli3B
Tue Feb 16, 2016 3:12 pm
Forum: Second Order Reactions
Topic: 2016 Winter Workbook pg. 36 #10
Replies: 1
Views: 379

Re: 2016 Winter Workbook pg. 36 #10

Because it is second order so if you use the equation 1/[a]=kt+1/[a0] you will see that 1-1/.5 is not the same as 1/.5-1/.25.
by PriyaKohli3B
Tue Feb 09, 2016 11:51 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: HW 8.67 b
Replies: 1
Views: 283

Re: HW 8.67 b

They state the standard enthalpy of sublimation for carbon is 717 kj/mol
by PriyaKohli3B
Tue Feb 09, 2016 11:49 pm
Forum: Calculating Work of Expansion
Topic: Change in moles
Replies: 1
Views: 384

Re: Change in moles

What they mean is there is one mole of each reactant meaning there are two moles of reactant gases and one mole of each product meaning two total moles of gas on the product side. Since the delta n is zero no work is done.
by PriyaKohli3B
Mon Feb 08, 2016 10:10 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Midterm 2012 2A
Replies: 1
Views: 228

Re: Midterm 2012 2A

Nope! It is correct! Hmm It could be that maybe you are subtracting? Make sure you add all the values together and you should get the correct answer!
by PriyaKohli3B
Mon Feb 08, 2016 6:58 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: How to know what units for pressure to use?
Replies: 2
Views: 404

Re: How to know what units for pressure to use?

We do not, we can use any unit for pressure I would use bar or atm but I do not think it matters since units for pressure cancel out anyways.
by PriyaKohli3B
Mon Feb 08, 2016 12:49 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Change in Free Energy is 0
Replies: 1
Views: 282

Re: Change in Free Energy is 0

By equilibrium we mean concentration equilibrium. So the concentration of reactants and products is the same making the equilibrium constant=1 and the Gibbs free energy to equal zero.
by PriyaKohli3B
Sun Feb 07, 2016 5:36 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Concentration Cells
Replies: 1
Views: 309

Re: Concentration Cells

Since the product is the one with the lower concentration the equation would be Cr3+(higher concentration)-->Cr3+ lower concentration. According to this equation the higher concentration is undergoing reduction and the lower concentration is undergoing oxidation. Oxidation occurs at the anode and re...
by PriyaKohli3B
Sun Feb 07, 2016 5:32 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Max Potential
Replies: 1
Views: 323

Re: Max Potential

Max potential means the largest potential difference that the galvanic cell can have. The max potential will in turn do the most work and have the largest electromotive force.
by PriyaKohli3B
Sun Feb 07, 2016 5:31 pm
Forum: Balancing Redox Reactions
Topic: Dismissing parts of a compound
Replies: 1
Views: 277

Re: Dismissing parts of a compound

We the part of the compound that participates in the redox reaction for example in the case of KMno4- K+ is not being reduced or oxidized it remains as K+ through the entirety of the reaction. It is a spectator ion. Whatever is being oxidized or reduced is included in the redox reaction which is why...
by PriyaKohli3B
Sun Feb 07, 2016 5:29 pm
Forum: Balancing Redox Reactions
Topic: Determining Anode and Cathode from E values
Replies: 1
Views: 488

Re: Determining Anode and Cathode from E values

So since E(not) is equal to E(cathode)-E(anode) you can determine which one is the cathode or anode by calculating which combination of the two gives a positive value for E not. Hope this helped!
by PriyaKohli3B
Sun Feb 07, 2016 5:21 pm
Forum: Phase Changes & Related Calculations
Topic: SIG FIG CONFUSION ON PRACTICE MIDTERMS
Replies: 1
Views: 285

SIG FIG CONFUSION ON PRACTICE MIDTERMS

In many of the problems in the practice midterm sig figs are used every step of the calculation. I thought that for sig figs we round at the end according to the appropriate number of sig figs. If we do not round every step of the way the end answer is wrong. For example in the 2012 practice midterm...
by PriyaKohli3B
Thu Feb 04, 2016 9:51 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Clarification of Equilibrium
Replies: 2
Views: 306

Re: Clarification of Equilibrium

So since k is the equilibrium constant why isn't dG 0 when we have reached equilibrium concentrations?
by PriyaKohli3B
Tue Feb 02, 2016 11:18 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Clarification of Equilibrium
Replies: 2
Views: 306

Clarification of Equilibrium

I am having a hard time understanding the relationship between G, E, and k. I understand the k is the equilibrium constant and it can have any value. So why is it that when a reaction is at equilibrium G and E are both zero. According to the equation for k, logk=nE(not)/.0592 but technically since k...
by PriyaKohli3B
Tue Feb 02, 2016 11:13 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: 14.93A
Replies: 2
Views: 422

14.93A

For part a to this question it asks whether 1 M Cr(Cl)3 or .0010 M Cr(Cl)3 would undergo spontaneous reduction, how do we know which one would undergo spontaneous reduction?
by PriyaKohli3B
Mon Feb 01, 2016 9:34 pm
Forum: Balancing Redox Reactions
Topic: 14.5a
Replies: 1
Views: 323

14.5a

I am confused as to how to write the balanced half reaction for the reduction of O3 to O2.
by PriyaKohli3B
Sun Jan 31, 2016 1:13 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: The laws of thermodynamics
Replies: 2
Views: 564

Re: The laws of thermodynamics

Yes! The first law states that energy cannot be created or destroyed. The second law sates that the entropy of an isolated system not in thermal equilibrium will always increase. The third law states that the entropy of a system approaches a constant value as the temperature approaches absolute zero...
by PriyaKohli3B
Sun Jan 31, 2016 1:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Video Competition
Replies: 66
Views: 25287

Re: Video Competition

When is the video due by?
by PriyaKohli3B
Sat Jan 23, 2016 7:23 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Winter 2015 Quiz 1 question 3
Replies: 1
Views: 299

Winter 2015 Quiz 1 question 3

In this problem the system is isothermal which means that the temperature is constant so since q=ncdt this means that q=0 and dU=dw but is the answers it says that du+0 and q=-w. Why is that?
by PriyaKohli3B
Sat Jan 23, 2016 4:48 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Irreversible isothermal systems
Replies: 1
Views: 198

Irreversible isothermal systems

If a system is irreversible and isothermal how do we manipulate Pv=nrt to account for the constant pressure and the irreversibility of the system?
by PriyaKohli3B
Fri Jan 22, 2016 10:37 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Quiz 1 Preparation 2014
Replies: 1
Views: 263

Quiz 1 Preparation 2014

For number 11 I understand how the work was calculated but I do not understand why the number is positive. Since the system is expanding it is doing work on the surroundings so work should be negative but in the solutions it is positive. Can somebody please explain this?
by PriyaKohli3B
Sun Jan 17, 2016 5:02 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Microstates Clarification
Replies: 1
Views: 221

Re: Microstates Clarification

No it will not be the same as the degeneracy in the example they must be equal in energy to have that type of degeneracy.
by PriyaKohli3B
Sat Jan 09, 2016 6:35 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.53
Replies: 1
Views: 246

8.53

For question 8.53 the temperature change occurs due to a reaction with 1.40 grams of carbon monoxide. How do we calculate the energy change for one mole of carbon monoxide?
by PriyaKohli3B
Sat Jan 09, 2016 3:35 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpies of Formation
Replies: 1
Views: 225

Standard Enthalpies of Formation

When we are writing out our equation with elements in their standard form, should we just put the state of the standard form or the name of the actual standard form? For example, the standard form of C is graphite so when I am writing my equation should I write C(graphite) or C(s)?
by PriyaKohli3B
Sat Jan 09, 2016 3:30 pm
Forum: Calculating Work of Expansion
Topic: Identifying Positive Potential Energy
Replies: 1
Views: 367

Re: Identifying Positive Potential Energy

The work is being done by pushing the pump and internal energy is equal to heat plus work so if the work being done is positive the internal energy will also be positive! hope this helped!

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