CHEMISTRY COMMUNITY

ntyshchenko

For question 6b why is the y-axis labeled Energy. If we are told the reaction is exothermic can we also label the y-axis deltaH?

ntyshchenko

If this substituent was on the shorter chain then it would simply be 1-propoxy-pentane since that "substituent" is moved to the shorter side and becomes just a part of the chain which is no longer (eth)oxy but (prop)oxy

ntyshchenko

In the solution manual, it says "the reaction profile corresponds to a plot similar to that shown in figure 13.31a" but there is no figure 13.31a in the book. Is it supposed to say figure 15.27a because that graph makes sense for the problem?

ntyshchenko

For kinetics, what part of the book is on the quiz? Does "Reaction profiles, Arrhenius equation and calculating activation energies" mean that it is only 15.11 and 15.13, or will the rest of chapter 15 be on the quiz?

Also, just to be clear, is Catalysis on there?

ntyshchenko

No. The slow step cannot be at equilibrium because that would mean there would be a buildup of some intermediate product that would go back into the reactant making that step actually the fast step.

ntyshchenko · Re: 2/24/17 Bruincast What about Lecture 2s video?

What about Lecture 2s video?

ntyshchenko

Why is it -q(acetonitrile)=+q(ice) instead of+q(acetonitrile)=-q(ice).

If you get the same answer then does it make a difference how you write it?

ntyshchenko

Thanks so much! If we put this in our answer would it still be right since they'd cancel out in the calculation?

ntyshchenko

Why wouldn't C(2)-H not be considered a broken bond?

Also for the C-H bond that is formed is that with C(3) or C(5)? Don't they both form a C-H bond? Why does the answer say there is only one C-H?

ntyshchenko

It says "happens under constant pressure, 1 atm, and room temperature, 25degrees". The wording structure means constant pressure and temperature, does it not?

ntyshchenko

Assuming the carbon atoms in glucose have 0 oxidation state whereas each H is +1, and each O -2, how many electrons are involved in glucose oxidation? C6H12O6(aq)+O2(g) --> H2O(l)+CO2(g) The answer says that C in CO2 has a +4 oxidation state Why does Carbon have +4 oxidation state? Also, does the qu...

ntyshchenko

The question says that the reaction happens at constant temperature. If there is no change in temperature (isothermal) why isn't the change in internal energy zero?

ntyshchenko

In the solutions manual it says that the reduction potential of water at pH=7 is -0.42V. How do we find this value? In appendix 2A it says that E=-0.83.

ntyshchenko

In this same question, why can't you use SO4- as the cathode?

ntyshchenko

Where are the solutions posted?

ntyshchenko

But if the Gibbs free energy of formation of PCl5 is -305 then doesn't that mean that the decomposition of PCl5 is +305 and thus the decomposition of it is thermodynamically unstable?

ntyshchenko

Yes I know but doesn't the total change in entropy include the entropy of vaporization?

The enthalpy part was just an example from another problem I'm not saying we need to find it here.

ntyshchenko

The question asks us to calculate the standard entropy of formation of H2O(l). so we have H2(g) + 1/2O2(g)>>>>>H2)(l) the solutions manual shows: 69.91J/Kmol - 1/2(205.14)-130 = -163.34 Why would we not subtract the entropy of vaporization from this answer like we did in question 8.67a when we found...

ntyshchenko

Why do you have to divide by four if it asks for the enthalpy density for the full reaction?

ntyshchenko

What would you plug in for T in this equation?

ntyshchenko

If there is no change in volume (like in a bomb calorimeter) , it's not possible for gases to do work, so work=0. (SInce work=PxdeltaV)

CHEMISTRY COMMUNITY

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2015 Final

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