CHEMISTRY COMMUNITY

PriyaKohli3B

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!

PriyaKohli3B

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...

PriyaKohli3B

Yes you can use copper, that is a common one to use!

PriyaKohli3B

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?

PriyaKohli3B

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.

PriyaKohli3B

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.

PriyaKohli3B

They state the standard enthalpy of sublimation for carbon is 717 kj/mol

PriyaKohli3B

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.

PriyaKohli3B

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!

PriyaKohli3B

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.

PriyaKohli3B

Know the concept but also know that n=(I*t)/F

PriyaKohli3B

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.

PriyaKohli3B

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...

PriyaKohli3B

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.

PriyaKohli3B

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...

PriyaKohli3B

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!

PriyaKohli3B

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...

PriyaKohli3B

Okay thanks

PriyaKohli3B

So since k is the equilibrium constant why isn't dG 0 when we have reached equilibrium concentrations?

PriyaKohli3B

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...

PriyaKohli3B

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?

PriyaKohli3B

I am confused as to how to write the balanced half reaction for the reduction of O3 to O2.

PriyaKohli3B

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...

PriyaKohli3B

When is the video due by?

PriyaKohli3B

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?

PriyaKohli3B

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?

PriyaKohli3B

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?

PriyaKohli3B

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.

PriyaKohli3B

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?

PriyaKohli3B

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)?

PriyaKohli3B

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!

CHEMISTRY COMMUNITY

Search found 31 matches

Re: Two different geometric isomers

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

Re: Determing salt bridge

naming cycloalkanes

Re: Stability of nucleophiles

Re: 2016 Winter Workbook pg. 36 #10

Re: HW 8.67 b

Re: Change in moles

Re: Midterm 2012 2A

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

Re: Electrolysis

Re: Change in Free Energy is 0

Re: Concentration Cells

Re: Max Potential

Re: Dismissing parts of a compound

Re: Determining Anode and Cathode from E values

SIG FIG CONFUSION ON PRACTICE MIDTERMS

Re: 14.93A

Re: Clarification of Equilibrium

Clarification of Equilibrium

14.93A

14.5a

Re: The laws of thermodynamics

Re: Video Competition

Winter 2015 Quiz 1 question 3

Irreversible isothermal systems

Quiz 1 Preparation 2014

Re: Microstates Clarification

8.53

Standard Enthalpies of Formation

Re: Identifying Positive Potential Energy