Search found 29 matches
- Sun Mar 18, 2018 6:25 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3891664
Re: Post All Chemistry Jokes Here
You can't spell joke without Potassium!
- Sun Mar 18, 2018 6:24 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3891664
Re: Post All Chemistry Jokes Here
I thought if we missed doing 3 posts per week, we lost those points weekly, rather than the fact that we just needed to do thirty post total; so apparently, my life is a joke.
- Sun Mar 18, 2018 6:19 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3891664
Re: Post All Chemistry Jokes Here
Silver walks up to gold in a bar and says, "Au, get outta here!"
- Sun Mar 18, 2018 6:16 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3891664
Re: Post All Chemistry Jokes Here
Everyone's favorite functional group:
- Sun Mar 18, 2018 6:13 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3891664
Re: Post All Chemistry Jokes Here
Me: "The Hess's Law problem on the final should be easy, right?"
Lavelle:
Lavelle:
- Sun Mar 18, 2018 6:12 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3891664
Re: Post All Chemistry Jokes Here
When they ask me if I was mentally stable during the final:
- Sun Mar 18, 2018 5:56 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3891664
Re: Post All Chemistry Jokes Here
When they ask me if I recognized the two problems on the exam that were from the homework:
- Sun Mar 18, 2018 5:47 pm
- Forum: Calculating Work of Expansion
- Topic: Final Question W18: Reversible vs. Irreversible External Pressure
- Replies: 4
- Views: 597
Final Question W18: Reversible vs. Irreversible External Pressure
What is the qualitative difference in external pressure between a reversible and an irreversible reaction (a question on the final)?
- Sun Mar 18, 2018 5:45 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: State Functions
- Replies: 4
- Views: 771
Re: State Functions
I believe there were four state functions: enthalpy (H), entropy (S), internal energy (U), and Gibbs free energy (G).
Reaction mechanisms, work, and heat depend on the pathway taken, so they would not be included in the category of state functions.
Reaction mechanisms, work, and heat depend on the pathway taken, so they would not be included in the category of state functions.
- Sun Mar 11, 2018 6:09 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3891664
Re: Post All Chemistry Jokes Here
Erwin Schrodinger brings his sick cat to the doctor. After waiting several hours in the waiting room, the doctor finally comes out. So Erwin says, "Well, doc?" And the doctor says, "I have good news and I have bad news."
- Sun Mar 11, 2018 6:03 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3891664
Re: Post All Chemistry Jokes Here
I found the worst Chemistry joke of all time from Dr. Rachuru Sanjeev, Department of Chemistry, Mizan-Tepi University, Tepi Campus, Tepi, Ethiopia: In a sports relay race, a chemical kinetics specialist runs slowly, and his group loses the race. When the chemical kinetics specialist is asked why he ...
- Sun Mar 11, 2018 5:55 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Overall Order with Negative Suborders
- Replies: 2
- Views: 514
Overall Order with Negative Suborders
When determining the order for a reaction where one of the orders for a reagent is negative, do we add the negative value (technically subtract) when calculating the overall order (there was a question about this on Test 3)?
Sorry if this has been asked, I can't find it!
Sorry if this has been asked, I can't find it!
- Sun Mar 04, 2018 11:34 pm
- Forum: Zero Order Reactions
- Topic: Slopes
- Replies: 3
- Views: 641
Slopes
Why is it important that the value of k tells us the slope of the various graphs that we have discussed in class? Should we know why the order of a reaction goes with certain concentrations or functions of concentrations on the y-axis?
- Wed Feb 28, 2018 8:41 pm
- Forum: Zero Order Reactions
- Topic: Zero Order Reactions in Real Life [ENDORSED]
- Replies: 3
- Views: 1334
Zero Order Reactions in Real Life [ENDORSED]
Can someone elaborate on why Dr. Lavelle discussed enzymes and catalysts as examples of reactant concentration not affecting the rate of the reaction?
- Wed Feb 28, 2018 8:38 pm
- Forum: Zero Order Reactions
- Topic: Zero Order Reactions and Rate of Reaction
- Replies: 5
- Views: 821
Re: Zero Order Reactions and Rate of Reaction
"Independent of the rate" would mean that the concentration of that specific reactant/product does not interact with or affect the rate of the reaction; this is by definition what a zero order species does, since it is raised to the power of 0 and becomes a 1 (which does not multiply the r...
- Sun Feb 18, 2018 11:34 pm
- Forum: Balancing Redox Reactions
- Topic: Skeletal equation
- Replies: 2
- Views: 338
Re: Skeletal equation
I found this from Quora:
"A skeletal equation is just a way of using the formulas to indicate the chemicals that were involved in the chemical reaction, without balancing electrons or species."
"A skeletal equation is just a way of using the formulas to indicate the chemicals that were involved in the chemical reaction, without balancing electrons or species."
- Sun Feb 18, 2018 11:26 pm
- Forum: Balancing Redox Reactions
- Topic: 14.15
- Replies: 2
- Views: 375
Re: 14.15
The post above is correct.
Prof. Lavelle's "Solution Manual Errors" document states the following:
"14.15(c).
The correct solution should have a 3 as the subscript for the nickel hydroxide reactant.
2Ni(OH)3 (s) + Cd(s) → Cd(OH)2 (s) + 2Ni(OH)2 (s) "
Prof. Lavelle's "Solution Manual Errors" document states the following:
"14.15(c).
The correct solution should have a 3 as the subscript for the nickel hydroxide reactant.
2Ni(OH)3 (s) + Cd(s) → Cd(OH)2 (s) + 2Ni(OH)2 (s) "
- Sun Feb 18, 2018 9:29 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Nernst Equation
- Replies: 6
- Views: 954
Nernst Equation
What does the nr variable represent in the Nernst Equation?
- Sat Feb 10, 2018 3:47 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Quantity of reversible vs. irreversible work
- Replies: 2
- Views: 389
Quantity of reversible vs. irreversible work
I remember being told, either at lecture or at discussion, that the calculation of reversible isothermal work would be greater than the quantity of work for the irreversible calculation for the same process.
Why is this true?
Why is this true?
- Sat Feb 10, 2018 2:51 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Chapter 9 Worksheet 3: Variable Volume Work Calculation [ENDORSED]
- Replies: 1
- Views: 344
Chapter 9 Worksheet 3: Variable Volume Work Calculation [ENDORSED]
For part a of number one on the chapter 9 worksheet 3 posted by Karen Leung, how is the work for the step from C to A (change of -90 Liters, no change in pressure) calculated, and why is it not the same way as the reversible isothermal expansion from B to C?
- Sun Feb 04, 2018 6:33 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: ΔS of vaporization
- Replies: 2
- Views: 373
ΔS of vaporization
Why is ΔS of vaporization for most compounds the same (85 J/K)? Is there a concept we have to understand about this fact?
- Sun Jan 28, 2018 8:29 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Chapter 9 help
- Replies: 3
- Views: 522
- Sun Jan 28, 2018 8:15 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Chapter 9 help
- Replies: 3
- Views: 522
Re: Chapter 9 help
This video is useful to understand in general what entropy is and why it's relevant! Crash course is not the best with examples, but it's entertaining and good for conceptual questions.
https://www.youtube.com/watch?v=ZsY4WcQOrfk&vl=en
https://www.youtube.com/watch?v=ZsY4WcQOrfk&vl=en
- Sun Jan 28, 2018 7:43 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Cp for an ideal gas
- Replies: 2
- Views: 452
Cp for an ideal gas
Can I get a conceptual explanation for why an ideal gas has a Cp value of (5/2) R? I'm not sure if we need to know how it's derived, but I would still like to know. Thank you!
- Sun Jan 21, 2018 10:37 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Converting L·atm to Joules
- Replies: 3
- Views: 9309
Converting L·atm to Joules
How can we convert L·atm to Joules? I have the answers to a few homework problems if we are able to do this.
- Sun Jan 21, 2018 10:06 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Negative Specific Heat Capacities
- Replies: 1
- Views: 1344
Negative Specific Heat Capacities
Under what circumstances can a negative specific heat capacity exist and what does that mean? I have seen other people see this in solution manuals for certain problems.
- Sun Jan 14, 2018 5:38 pm
- Forum: Phase Changes & Related Calculations
- Topic: Steam Burning
- Replies: 7
- Views: 954
Re: Steam Burning
I would like to add that it's really useful to see the heating curve for water to really understand where all of that extra energy is coming from in the steam version that boiling water does not have. Conceptually, I like to see it as a pathway the water has to take to reach certain temperatures. Fo...
- Sun Jan 14, 2018 5:32 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard Reaction Enthalpy Definition
- Replies: 7
- Views: 609
Standard Reaction Enthalpy Definition
In lecture, I wrote down that Standard Reaction Enthalpy is defined at 1 atm if it's in a gas state (1 M if in a solution) and of elements in their most stable forms. I wasn't sure if I misheard Dr. Lavelle when he discussed the temperature of 298 Kelvin / 25 degrees Celsius; does standard reaction ...
- Sun Jan 14, 2018 5:29 pm
- Forum: Phase Changes & Related Calculations
- Topic: 8.41
- Replies: 4
- Views: 471
Re: 8.41
Our goal is to find final temperature, so we can use the q= ΔH=nCΔT because ΔT includes initial and final temperatures inherently. The solution manual sets the ice cube and water's heats equal because it's explained that the heat gained by the ice cube will be equal to the heat lost by the hot water...