Search found 24 matches
- Thu Mar 10, 2016 11:50 pm
- Forum: *Free Energy of Activation vs Activation Energy
- Topic: Activation energy question
- Replies: 1
- Views: 452
Activation energy question
Why is this 4kcal and not -4kcal?
- Thu Mar 10, 2016 4:13 pm
- Forum: *Amines
- Topic: naming amine
- Replies: 1
- Views: 1271
naming amine
how is isopropylamine 2-propanamine?
- Thu Mar 10, 2016 12:24 pm
- Forum: Calculating Work of Expansion
- Topic: Final 2015 Question #3
- Replies: 2
- Views: 520
Re: Final 2015 Question #3
yeah so wouldn't it make sense to say 3.9J of work was done?
- Thu Mar 10, 2016 10:59 am
- Forum: Calculating Work of Expansion
- Topic: Final 2015 Question #3
- Replies: 2
- Views: 520
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...
- Wed Mar 09, 2016 11:09 pm
- Forum: *Nucleophilic Substitution
- Topic: Final 2014 Question 6
- Replies: 1
- Views: 1257
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?
if we have to find the mechanisms through the rate law, how do you do it?
- Tue Mar 08, 2016 9:47 pm
- Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
- Topic: cis conformation
- Replies: 2
- Views: 610
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?
- Mon Feb 29, 2016 1:23 pm
- Forum: *Alkanes
- Topic: Naming alkanes
- Replies: 2
- Views: 488
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...
- Sat Feb 27, 2016 2:36 pm
- Forum: *Alkanes
- Topic: Numbering the Carbon
- Replies: 4
- Views: 712
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...
- Wed Feb 24, 2016 7:12 pm
- Forum: *Alkanes
- Topic: iso and sec
- Replies: 2
- Views: 522
iso and sec
What is the difference between iso and sec exactly?
- Fri Feb 19, 2016 5:55 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Formal Charges
- Replies: 2
- Views: 586
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?
- Sun Feb 14, 2016 12:14 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: zero order reaction
- Replies: 2
- Views: 817
zero order reaction
Why is it a zero order reaction with slope -k if the straight line fits to the data?
- Sun Feb 07, 2016 8:22 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Total Entropy
- Replies: 1
- Views: 348
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)
- 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: 371
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?
- 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: 595
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?
- 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: 516
Residual entropy and statistical entropy
What is the difference between residual entropy and statistical entropy? Is there a difference?
- Fri Jan 29, 2016 12:56 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Entropy changes
- Replies: 1
- Views: 608
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?
- 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: 509
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...
- Sun Jan 24, 2016 12:44 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Homework 9.19
- Replies: 1
- Views: 537
Homework 9.19
Why did the solution manual heat the water to 100C then cool it back down to 85C?
- Sat Jan 23, 2016 11:39 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Delta S equation
- Replies: 2
- Views: 9165
Delta S equation
How is Delta S equal to nRln(V1/V2)?
- Fri Jan 22, 2016 2:51 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Expansion work
- Replies: 4
- Views: 913
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?
- 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: 957
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)?
- 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: 403
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?
- 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: 406
Standard Enthalpy
What is the difference between standard enthalpy of formation and standard enthalpy of reaction?
- 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: 487
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?