Search found 29 matches

by Ricardo Ruiz Flores 1D
Sun Mar 18, 2018 6:25 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019011

Re: Post All Chemistry Jokes Here

You can't spell joke without Potassium!
by Ricardo Ruiz Flores 1D
Sun Mar 18, 2018 6:24 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019011

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.
by Ricardo Ruiz Flores 1D
Sun Mar 18, 2018 6:19 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019011

Re: Post All Chemistry Jokes Here

Silver walks up to gold in a bar and says, "Au, get outta here!"
by Ricardo Ruiz Flores 1D
Sun Mar 18, 2018 6:16 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019011

Re: Post All Chemistry Jokes Here

Everyone's favorite functional group:
by Ricardo Ruiz Flores 1D
Sun Mar 18, 2018 6:13 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019011

Re: Post All Chemistry Jokes Here

Me: "The Hess's Law problem on the final should be easy, right?"
Lavelle:
by Ricardo Ruiz Flores 1D
Sun Mar 18, 2018 6:12 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019011

Re: Post All Chemistry Jokes Here

When they ask me if I was mentally stable during the final:
by Ricardo Ruiz Flores 1D
Sun Mar 18, 2018 5:56 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019011

Re: Post All Chemistry Jokes Here

When they ask me if I recognized the two problems on the exam that were from the homework:
by Ricardo Ruiz Flores 1D
Sun Mar 18, 2018 5:47 pm
Forum: Calculating Work of Expansion
Topic: Final Question W18: Reversible vs. Irreversible External Pressure
Replies: 4
Views: 240

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)?
by Ricardo Ruiz Flores 1D
Sun Mar 18, 2018 5:45 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: State Functions
Replies: 4
Views: 313

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.
by Ricardo Ruiz Flores 1D
Sun Mar 11, 2018 6:09 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019011

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."
by Ricardo Ruiz Flores 1D
Sun Mar 11, 2018 6:03 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1019011

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 ...
by Ricardo Ruiz Flores 1D
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: 214

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!
by Ricardo Ruiz Flores 1D
Sun Mar 04, 2018 11:34 pm
Forum: Zero Order Reactions
Topic: Slopes
Replies: 3
Views: 153

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?
by Ricardo Ruiz Flores 1D
Wed Feb 28, 2018 8:41 pm
Forum: Zero Order Reactions
Topic: Zero Order Reactions in Real Life [ENDORSED]
Replies: 3
Views: 196

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?
by Ricardo Ruiz Flores 1D
Wed Feb 28, 2018 8:38 pm
Forum: Zero Order Reactions
Topic: Zero Order Reactions and Rate of Reaction
Replies: 5
Views: 236

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...
by Ricardo Ruiz Flores 1D
Sun Feb 18, 2018 11:34 pm
Forum: Balancing Redox Reactions
Topic: Skeletal equation
Replies: 2
Views: 94

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."
by Ricardo Ruiz Flores 1D
Sun Feb 18, 2018 11:26 pm
Forum: Balancing Redox Reactions
Topic: 14.15
Replies: 2
Views: 102

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) "
by Ricardo Ruiz Flores 1D
Sun Feb 18, 2018 9:29 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Nernst Equation
Replies: 6
Views: 325

Nernst Equation

What does the nr variable represent in the Nernst Equation?
by Ricardo Ruiz Flores 1D
Sat Feb 10, 2018 3:47 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Quantity of reversible vs. irreversible work
Replies: 2
Views: 143

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?
by Ricardo Ruiz Flores 1D
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: 133

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?
by Ricardo Ruiz Flores 1D
Sun Feb 04, 2018 6:33 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: ΔS of vaporization
Replies: 2
Views: 121

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?
by Ricardo Ruiz Flores 1D
Sun Jan 28, 2018 8:15 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Chapter 9 help
Replies: 3
Views: 162

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
by Ricardo Ruiz Flores 1D
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: 109

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!
by Ricardo Ruiz Flores 1D
Sun Jan 21, 2018 10:37 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Converting L·atm to Joules
Replies: 3
Views: 4808

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.
by Ricardo Ruiz Flores 1D
Sun Jan 21, 2018 10:06 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Negative Specific Heat Capacities
Replies: 1
Views: 165

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.
by Ricardo Ruiz Flores 1D
Sun Jan 14, 2018 5:38 pm
Forum: Phase Changes & Related Calculations
Topic: Steam Burning
Replies: 7
Views: 304

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...
by Ricardo Ruiz Flores 1D
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: 181

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 ...
by Ricardo Ruiz Flores 1D
Sun Jan 14, 2018 5:29 pm
Forum: Phase Changes & Related Calculations
Topic: 8.41
Replies: 4
Views: 217

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...

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