Search found 21 matches

by ntyshchenko
Sat Mar 18, 2017 11:59 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: 2015 Final
Replies: 1
Views: 204

2015 Final

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?
by ntyshchenko
Sun Mar 12, 2017 10:58 pm
Forum: *Ethers
Topic: Ether Naming
Replies: 1
Views: 570

Re: Ether Naming

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
by ntyshchenko
Fri Mar 03, 2017 12:39 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: HW problem 15.65 solution
Replies: 1
Views: 217

HW problem 15.65 solution

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?
by ntyshchenko
Thu Mar 02, 2017 11:55 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 15887

Re: Quiz 3 Winter 2017

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?
by ntyshchenko
Sun Feb 26, 2017 9:03 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow Equilibrium Step?
Replies: 2
Views: 288

Re: Slow Equilibrium Step?

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.
by ntyshchenko
Sun Feb 26, 2017 8:58 pm
Forum: Administrative Questions and Class Announcements
Topic: 2/24/17 Bruincast
Replies: 19
Views: 2136

Re: 2/24/17 Bruincast

What about Lecture 2s video?
by ntyshchenko
Wed Feb 15, 2017 4:04 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Midterm 2016 2
Replies: 1
Views: 263

Midterm 2016 2

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?
by ntyshchenko
Wed Feb 15, 2017 3:36 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 2016 Midterm 1a
Replies: 2
Views: 366

Re: 2016 Midterm 1a

Thanks so much! If we put this in our answer would it still be right since they'd cancel out in the calculation?
by ntyshchenko
Tue Feb 14, 2017 9:47 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 2016 Midterm 1a
Replies: 2
Views: 366

2016 Midterm 1a

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?
by ntyshchenko
Tue Feb 14, 2017 9:35 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Winter 2015 Midterm Question 2
Replies: 2
Views: 320

Re: Winter 2015 Midterm Question 2

It says "happens under constant pressure, 1 atm, and room temperature, 25degrees". The wording structure means constant pressure and temperature, does it not?
by ntyshchenko
Mon Feb 13, 2017 10:59 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Winter 2015 Midterm 8c
Replies: 1
Views: 216

Winter 2015 Midterm 8c

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...
by ntyshchenko
Mon Feb 13, 2017 10:14 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Winter 2015 Midterm Question 2
Replies: 2
Views: 320

Winter 2015 Midterm Question 2

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?
by ntyshchenko
Thu Feb 09, 2017 7:28 pm
Forum: Balancing Redox Reactions
Topic: HW 14.57
Replies: 2
Views: 284

HW 14.57

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.
by ntyshchenko
Thu Feb 09, 2017 7:22 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Ch 14 q 55
Replies: 2
Views: 380

Re: Ch 14 q 55

In this same question, why can't you use SO4- as the cathode?
by ntyshchenko
Mon Jan 30, 2017 9:55 pm
Forum: Phase Changes & Related Calculations
Topic: Quiz 1
Replies: 11
Views: 946

Re: Quiz 1

Where are the solutions posted?
by ntyshchenko
Mon Jan 30, 2017 9:31 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy: Spontaneous versus Unstable?
Replies: 2
Views: 388

Re: Gibbs Free Energy: Spontaneous versus Unstable?

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?
by ntyshchenko
Mon Jan 30, 2017 5:04 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.37
Replies: 2
Views: 343

Re: 9.37

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.
by ntyshchenko
Sun Jan 29, 2017 10:14 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.37
Replies: 2
Views: 343

9.37

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...
by ntyshchenko
Sun Jan 22, 2017 10:01 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Sign change ch 8 q 51 [ENDORSED]
Replies: 4
Views: 629

Re: Sign change ch 8 q 51 [ENDORSED]

Why do you have to divide by four if it asks for the enthalpy density for the full reaction?
by ntyshchenko
Sun Jan 22, 2017 9:38 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 8.49
Replies: 3
Views: 516

Re: 8.49

What would you plug in for T in this equation?
by ntyshchenko
Sun Jan 15, 2017 10:58 pm
Forum: Phase Changes & Related Calculations
Topic: Homework Question 8.28
Replies: 1
Views: 460

Re: Homework Question 8.28

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)

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