Search found 33 matches

by Wenting Hu 2H
Fri Mar 16, 2018 1:39 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: 15.65
Replies: 1
Views: 88

15.65

Can someone explain part c to me? Why does raising temperature increase the rate constant of the reaction with the higher activation barrier?
by Wenting Hu 2H
Fri Mar 16, 2018 1:25 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 15.63
Replies: 6
Views: 195

Re: 15.63

Update: the answer book is wrong. It's 0.008314, not 0.08314. So it is equal to 0.59
by Wenting Hu 2H
Fri Mar 16, 2018 1:21 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 15.63
Replies: 6
Views: 195

Re: 15.63

Wait but i get 0.059 instead of 0.59? It that just me?
by Wenting Hu 2H
Tue Mar 13, 2018 5:02 pm
Forum: First Order Reactions
Topic: 15.85
Replies: 3
Views: 211

15.85

What does it mean to draw a proposed structure for the activated complex?
by Wenting Hu 2H
Mon Mar 12, 2018 1:32 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 15.63
Replies: 4
Views: 203

15.63

how do you do 15.63? The rate constant of the reaction between CO2 and OH in aqueous solution to give the HCO3 ion is 1.5 x10^10 L*mol^1s^1 at 25 C. Determine the rate constant at blood temperature (37 C), given that the activation energy for the reaction is 38 kJ/mol. I don't get how to set up t...
by Wenting Hu 2H
Thu Mar 08, 2018 2:51 am
Forum: General Rate Laws
Topic: Reaction Rates
Replies: 4
Views: 172

Reaction Rates

Are reaction rates always positive?
by Wenting Hu 2H
Wed Mar 07, 2018 1:47 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: 15.13
Replies: 1
Views: 93

15.13

Just to clarify for part b, hypothetically, if it were a second order reaction and H2 concentration doubled, then the initial rate would quadruple right?
by Wenting Hu 2H
Tue Mar 06, 2018 10:47 pm
Forum: General Rate Laws
Topic: Relative Rates and Differential Rate Law [ENDORSED]
Replies: 1
Views: 121

Relative Rates and Differential Rate Law [ENDORSED]

Hi can someone explain the difference between the functions of the relative rate law equation and the differential rate law?
by Wenting Hu 2H
Fri Mar 02, 2018 1:28 am
Forum: Administrative Questions and Class Announcements
Topic: Test 3
Replies: 6
Views: 288

Re: Test 3

What about integrated problems?
by Wenting Hu 2H
Fri Mar 02, 2018 1:22 am
Forum: General Rate Laws
Topic: Test 3
Replies: 3
Views: 156

Test 3

What homework question should we do up to to prepare for the upcoming test if the test will only cover 15.1-15.6?
by Wenting Hu 2H
Wed Feb 28, 2018 5:13 pm
Forum: Second Order Reactions
Topic: 15.39
Replies: 2
Views: 115

15.39

Can someone explain how the book got 0.055 for the [A]t value?
by Wenting Hu 2H
Fri Feb 23, 2018 12:08 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Reaction Favoring Products
Replies: 2
Views: 102

Re: Reaction Favoring Products

When cathode has a higher value than anode, it makes the E positive since E=Ecathode=Eanode. We now know that the reaction favors the products because G=-nFE. If E is positive, G is negative and therefore, the reaction will spontaneously form products.
by Wenting Hu 2H
Tue Feb 20, 2018 10:17 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: 14.31
Replies: 6
Views: 206

14.31

for 14.31 how do we determine if the reaction has k>1? Is it cathode/anode?
by Wenting Hu 2H
Mon Feb 19, 2018 4:02 pm
Forum: Balancing Redox Reactions
Topic: Oxidizing/Reducing Agents
Replies: 2
Views: 112

Oxidizing/Reducing Agents

Is the oxidizing agent basically just the the molecule that is being reduced (gaining electrons)? and the reducing agent the molecule that is losing electrons (oxidized)?
by Wenting Hu 2H
Wed Feb 14, 2018 2:08 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Test 1 Question 3b
Replies: 2
Views: 150

Re: Test 1 Question 3b

It's because the system is doing work and because the change in internal energy is 0 at constant temperature, w=-q
by Wenting Hu 2H
Sat Feb 10, 2018 5:53 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 9.91
Replies: 1
Views: 96

9.91

For 9.91, where it asks us to calculate Gibbs at various temperatures, why is the answer book using 44 kj/mol as deltaH even when the temperature isn't 25 degrees celsius? Doesn't 44 kj/mol only apply at 25 degrees?
by Wenting Hu 2H
Thu Feb 08, 2018 9:29 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 9.23
Replies: 1
Views: 78

9.23

9.23 states: Which would you expect to have a higher molar entropy at T = 0, single crystals of BF3 or of COF2? Why? The answer book explains the answer as COF2 because there is more variations in bond groups to the central atom, but does it also have something to do with the double bond that COF2 h...
by Wenting Hu 2H
Thu Feb 08, 2018 8:41 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Derivation of isothermal entropy equations
Replies: 1
Views: 84

Derivation of isothermal entropy equations

For questions like 9.9, why is it that when you sub -w in for q under isothermal conditions, it becomes dS=+PdV/T? Shouldn't it be -PdV?
by Wenting Hu 2H
Tue Feb 06, 2018 7:00 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 11.99
Replies: 2
Views: 150

11.99

For 11.99, (a) Calculate the standard Gibbs free energies of formation of the halogen atoms X(g) at 1000. K from data available in Table 11.2. (b) Show how these data correlate with the XOX bond strength by plotting the standard Gibbs free energy of formation of the atoms against the bond dissociati...
by Wenting Hu 2H
Thu Feb 01, 2018 7:56 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.43
Replies: 5
Views: 112

Re: 9.43

I was wondering the same thing because for Table 9.2, it says 75.3 is the standard molar entropy of the water at 50 degrees C. What happened to the water at 20 degrees?
by Wenting Hu 2H
Wed Jan 31, 2018 12:31 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 9.13
Replies: 7
Views: 220

Re: 9.13

I have the same question. Why is it that for the change in volume, we use R, but then for the change in temperature, we use 5/2R?
by Wenting Hu 2H
Wed Jan 31, 2018 12:16 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 9.9
Replies: 3
Views: 138

9.9

Why does isothermal mean that deltaU=0?
by Wenting Hu 2H
Sat Jan 27, 2018 6:08 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Units for Entropy
Replies: 4
Views: 131

Re: Units for Entropy

sometimes per mole means per the coefficient of each element of the equation.
by Wenting Hu 2H
Sat Jan 27, 2018 6:01 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Adiabatic system
Replies: 6
Views: 191

Re: Adiabatic system

I believe adiabatic systems can also occur in closed systems, since even if no heat is being transferred, work can still be transferred as energy, making it a closed system.
by Wenting Hu 2H
Tue Jan 23, 2018 8:11 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.101E
Replies: 1
Views: 95

8.101E

Can someone elaborate on what enthalpy exchange means? the question goes: A technician carries out the reaction 2 SO2(g) + O2(g) --> 2 SO3(g) at 25 C and 1.00 atm in a constant-pressure cylinder fitted with a piston. Initially, 0.030 mol SO2 and 0.030 mol O2 are present in the cylinder. How much e...
by Wenting Hu 2H
Sat Jan 20, 2018 9:11 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capcity for Water
Replies: 8
Views: 263

Re: Heat Capcity for Water

Yes, it's on the constants and formula sheet on his website.
by Wenting Hu 2H
Thu Jan 18, 2018 11:06 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.19
Replies: 2
Views: 151

Re: 8.19

For q(copper)= - q(water), does it matter where the negative sign is? I learned today in discussion that it did but then it doesn't make sense to me. Isn't the water gaining the heat that the copper lost? So shouldn't it be -q(copper)=q(water)?
by Wenting Hu 2H
Wed Jan 17, 2018 12:52 am
Forum: Phase Changes & Related Calculations
Topic: Adiabatic vs Isolated Systems
Replies: 2
Views: 104

Adiabatic vs Isolated Systems

Is there a difference between adiabatic processes and isolated systems?
by Wenting Hu 2H
Mon Jan 15, 2018 10:51 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: HW Ch.8 #59 and 63
Replies: 7
Views: 293

Re: HW Ch.8 #59 and 63

I'm confused as well. Can someone explain?
by Wenting Hu 2H
Sat Jan 13, 2018 9:26 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.53
Replies: 2
Views: 101

Re: 8.53

For this problem, why do we need to take into account that q reaction is equal to -q calorimeter as it states in the solutions manual?
by Wenting Hu 2H
Sat Jan 13, 2018 12:16 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Closed System
Replies: 7
Views: 273

Re: Closed System

Is a calorimeter a closed or an isolated system?
by Wenting Hu 2H
Thu Jan 11, 2018 9:26 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Homework Problem 8.21
Replies: 4
Views: 203

Re: Homework Problem 8.21

Just making sure, but is the final temperature of the water also the final temperature of the copper mass?
by Wenting Hu 2H
Thu Jan 11, 2018 5:56 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Book 8.11 [ENDORSED]
Replies: 5
Views: 229

Re: Book 8.11 [ENDORSED]

What is the difference between irreversible expansion and reversible expansion?

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