Search found 24 matches

by JukaKim_1D
Thu Mar 10, 2016 11:50 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: Activation energy question
Replies: 1
Views: 239

Activation energy question

Why is this 4kcal and not -4kcal?
by JukaKim_1D
Thu Mar 10, 2016 4:13 pm
Forum: *Amines
Topic: naming amine
Replies: 1
Views: 595

naming amine

how is isopropylamine 2-propanamine?
by JukaKim_1D
Thu Mar 10, 2016 12:24 pm
Forum: Calculating Work of Expansion
Topic: Final 2015 Question #3
Replies: 2
Views: 261

Re: Final 2015 Question #3

yeah so wouldn't it make sense to say 3.9J of work was done?
by JukaKim_1D
Thu Mar 10, 2016 10:59 am
Forum: Calculating Work of Expansion
Topic: Final 2015 Question #3
Replies: 2
Views: 261

Final 2015 Question #3

When the question asks, what is the work DONE by the air in the lungs as it expands on going from 20C to 37C, even though the calculation would be -3.9J (in terms of the system), shouldn't the answer be 3.9J? Because "doing work" and the negative sign cancels out each other in terms of def...
by JukaKim_1D
Wed Mar 09, 2016 11:09 pm
Forum: *Nucleophilic Substitution
Topic: Final 2014 Question 6
Replies: 1
Views: 599

Final 2014 Question 6

For this problem, do you have to find the mechanisms through the rate law? or would the steps be given?
if we have to find the mechanisms through the rate law, how do you do it?
by JukaKim_1D
Tue Mar 08, 2016 9:47 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: cis conformation
Replies: 2
Views: 310

cis conformation

If you have a cis conformation, would the substituents go on axial and axial or equatorial and equatorial? does it mean that it is in trans conformation if one of them was on axial and the other was equatorial?
by JukaKim_1D
Mon Feb 29, 2016 1:23 pm
Forum: *Alkanes
Topic: Naming alkanes
Replies: 2
Views: 242

Naming alkanes

When you have dimethylethyl as a substituent and methyl as another substituent on a parent chain, octane, and the numbering can either be 4,5 or 5,4, would you put 4-(1,1-dimethylethyl)-5-methyl-octane or 4-methyl-5-(1,1-dimethylethyl)-octane? When considering the alphabetical order for the dimethyl...
by JukaKim_1D
Sat Feb 27, 2016 2:36 pm
Forum: *Alkanes
Topic: Numbering the Carbon
Replies: 4
Views: 285

Numbering the Carbon

How do you know which Carbon is carbon one, for example on 1-ethoxy-3-methylpentane? why is the carbon to the left of the oxygen 1 and not the one on the right? also, if the carbon to the left of the oxygen is the first carbon, why is the carbon to the right also a 1 when naming it "1-ethoxy&qu...
by JukaKim_1D
Wed Feb 24, 2016 7:12 pm
Forum: *Alkanes
Topic: iso and sec
Replies: 2
Views: 283

iso and sec

What is the difference between iso and sec exactly?
by JukaKim_1D
Fri Feb 19, 2016 5:55 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Formal Charges
Replies: 2
Views: 308

Formal Charges

Today, the TA substituting for class mentioned formal charges. What does formal charges have to do with organic molecules? does it determine which molecule bonds with which elements?
by JukaKim_1D
Sun Feb 14, 2016 12:14 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: zero order reaction
Replies: 2
Views: 493

zero order reaction

Why is it a zero order reaction with slope -k if the straight line fits to the data?
by JukaKim_1D
Sun Feb 07, 2016 8:22 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Total Entropy
Replies: 1
Views: 187

Total Entropy

Why is it that a reaction is spontaneous if the total entropy is greater than zero but unpredictable if the entropy of the system is greater than 0? (Problem 9.73)
by JukaKim_1D
Thu Feb 04, 2016 9:53 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Problem 8.111
Replies: 1
Views: 214

Problem 8.111

Why does the reactor need to be cooled to maintain a constant temperature when the reaction is exothermic? Shouldn't the reactor be heated because heat is leaving the system?
by JukaKim_1D
Thu Feb 04, 2016 3:21 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy of Vaporization
Replies: 1
Views: 307

Enthalpy of Vaporization

What is the significance of the enthalpy of vaporization of water at 25C? Does this mean that the water undergoes a phase change from liquid to gas at 25C? How is that possible?
by JukaKim_1D
Tue Feb 02, 2016 5:46 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Residual entropy and statistical entropy
Replies: 1
Views: 252

Residual entropy and statistical entropy

What is the difference between residual entropy and statistical entropy? Is there a difference?
by JukaKim_1D
Fri Jan 29, 2016 12:56 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy changes
Replies: 1
Views: 416

Entropy changes

Why is it that when calculating for entropy change delta S is equal to either nRlnV2/V1 or nClnT2/T1 but when using pressure, it is nRlnP1/P2?
by JukaKim_1D
Sun Jan 24, 2016 5:58 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: When G, H, and S are equal to 0? Quiz 1 Prep Winter 2015
Replies: 1
Views: 282

When G, H, and S are equal to 0? Quiz 1 Prep Winter 2015

For #9 on the second practice quiz, why does the entropy of the surroundings not equal 0? Also, is deltaG and deltaS(system) 0 due to the fact that although they are both heated, they become cooled to their original temperature, thus making the total change in each case 0? W(degenracy) changes becau...
by JukaKim_1D
Sun Jan 24, 2016 12:44 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Homework 9.19
Replies: 1
Views: 329

Homework 9.19

Why did the solution manual heat the water to 100C then cool it back down to 85C?
by JukaKim_1D
Sat Jan 23, 2016 11:39 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Delta S equation
Replies: 2
Views: 1254

Delta S equation

How is Delta S equal to nRln(V1/V2)?
by JukaKim_1D
Fri Jan 22, 2016 2:51 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Expansion work
Replies: 4
Views: 472

Expansion work

What does it mean when problems state no expansion work? does that mean that the volume doesn't change? how else would it do work if the volume does not change?
by JukaKim_1D
Mon Jan 18, 2016 2:17 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Question 8.99
Replies: 3
Views: 478

Question 8.99

Where can I find the standard enthalpies of the reactions for HCl and ZnCl? How do I find the standard enthalpy of reaction for the equation, 2HCl (aq) + Zn(s) --> H2(g) + ZnCl2 (aq)?
by JukaKim_1D
Mon Jan 18, 2016 2:13 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Question 8.117
Replies: 1
Views: 229

Question 8.117

For question 8.117, why is it that the net mole change is 2/3 when the equation is CH4(g) + H2O(g) -> CO2(g) + 3H2(g)? Shouldn't the net mole change be 2?
by JukaKim_1D
Fri Jan 15, 2016 10:58 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpy
Replies: 1
Views: 229

Standard Enthalpy

What is the difference between standard enthalpy of formation and standard enthalpy of reaction?
by JukaKim_1D
Fri Jan 08, 2016 1:29 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpy of Formation
Replies: 2
Views: 231

Standard Enthalpy of Formation

Why is the standard enthalpy of formation for liquid water not 0? Isn't water at its most stable form as a liquid?

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