CHEMISTRY COMMUNITY

Ricardo Ruiz Flores 1D

You can't spell joke without Potassium!

Ricardo Ruiz Flores 1D

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.

Ricardo Ruiz Flores 1D

Silver walks up to gold in a bar and says, "Au, get outta here!"

Ricardo Ruiz Flores 1D

Everyone's favorite functional group:

Ricardo Ruiz Flores 1D

Me: "The Hess's Law problem on the final should be easy, right?"
Lavelle:

Ricardo Ruiz Flores 1D

When they ask me if I was mentally stable during the final:

Ricardo Ruiz Flores 1D

When they ask me if I recognized the two problems on the exam that were from the homework:

Ricardo Ruiz Flores 1D

What is the qualitative difference in external pressure between a reversible and an irreversible reaction (a question on the final)?

Ricardo Ruiz Flores 1D

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.

Ricardo Ruiz Flores 1D

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."

Ricardo Ruiz Flores 1D

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 ...

Ricardo Ruiz Flores 1D

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!

Ricardo Ruiz Flores 1D

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?

Ricardo Ruiz Flores 1D

Can someone elaborate on why Dr. Lavelle discussed enzymes and catalysts as examples of reactant concentration not affecting the rate of the reaction?

Ricardo Ruiz Flores 1D

"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...

Ricardo Ruiz Flores 1D

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."

Ricardo Ruiz Flores 1D

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) "

Ricardo Ruiz Flores 1D

What does the n_r variable represent in the Nernst Equation?

Ricardo Ruiz Flores 1D

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?

Ricardo Ruiz Flores 1D

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?

Ricardo Ruiz Flores 1D

Why is ΔS of vaporization for most compounds the same (85 J/K)? Is there a concept we have to understand about this fact?

Ricardo Ruiz Flores 1D

https://www.youtube.com/watch?v=UtSX9_OGNjU

Another good one!

Ricardo Ruiz Flores 1D

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

Ricardo Ruiz Flores 1D

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!

Ricardo Ruiz Flores 1D

How can we convert L·atm to Joules? I have the answers to a few homework problems if we are able to do this.

Ricardo Ruiz Flores 1D

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.

Ricardo Ruiz Flores 1D

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...

Ricardo Ruiz Flores 1D

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 ...

Ricardo Ruiz Flores 1D

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...

CHEMISTRY COMMUNITY

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Final Question W18: Reversible vs. Irreversible External Pressure

Re: State Functions

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Overall Order with Negative Suborders

Slopes

Zero Order Reactions in Real Life [ENDORSED]

Re: Zero Order Reactions and Rate of Reaction

Re: Skeletal equation

Re: 14.15

Nernst Equation

Quantity of reversible vs. irreversible work

Chapter 9 Worksheet 3: Variable Volume Work Calculation [ENDORSED]

ΔS of vaporization

Re: Chapter 9 help

Re: Chapter 9 help

Cp for an ideal gas

Converting L·atm to Joules

Negative Specific Heat Capacities

Re: Steam Burning

Standard Reaction Enthalpy Definition

Re: 8.41