CHEMISTRY COMMUNITY

Eva Guillory 2E

Does anyone have an idea of when the final grades will be released?

Eva Guillory 2E

In addition, my ta told me that Lavelle prefers you put the aqueous elements closer to the double line (salt bridge) in the middle, and platinum (if included) on the outside.

Eva Guillory 2E

Considering the midterm and past finals, it will probably be somewhere between 8 to 10 questions.

Eva Guillory 2E

Here is a diagram that you might find helpful:

Eva Guillory 2E

Here is what Lavelle said in the syllabus: "Each test and exam has a total score but is not assigned a grade. Only at the end of the class when the class average score (out of 500 points) is known are final grades assigned. This class does not use a curve." So, its probably not very likely...

Eva Guillory 2E

https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Kinetics/Experimental_Methods/Methods_of_Determining_Reaction_Order has some useful descriptions to help differentiate them: "In a first-order reac...

Eva Guillory 2E

This makes sense, but I'm confused, because for the answer of 6L.5 part b in the 7th edition (which i listed below), despite Iodine being a solid, platinum is still included? In the solution manual, it does say that "An inert electrode such as Pt is necessary when both oxidized and reduced spec...

Eva Guillory 2E

For problem 6L.3 in the 7th edition, how are we supposed to find the E° values of the cathode and anode? Is there an index in the back of the book that we are supposed to look the values up in, or do we just solve for them using an equation? In addition, if we do have to solve for them, what equatio...

Eva Guillory 2E

In a redox reaction, oxidation involves a loss of electrons, and reduction involves a gain of electrons. Some mnemonic devices that might be helpful include: LEO the lion says GER, where LEO = Loss of Electrons is Oxidation and GER = Gain of Electrons is Reduction OIL RIG, where OIL = Oxidation Is L...

Eva Guillory 2E

http://image.slidesharecdn.com/tang05-entropyandgibbsfreeenergy-120209095951-phpapp01/95/tang-05-entropy-and-gibbs-free-energy-13-638.jpg?cb=1422605471 What do exergonic and endergonic mean? In a reaction, exergonic means that energy is released to the surroundings, and endergonic means that energy...

Eva Guillory 2E

Here is a table that might help:

Eva Guillory 2E

Gibbs free energy is measured in units of kJ/mol

Eva Guillory 2E

Here is a table which might help:

Eva Guillory 2E

Eva Guillory 2E

Eva Guillory 2E

viewtopic.php?t=9861

In summary, "Expansion work is pressure-volume work, and nonexpansion work is anything else (electrical, friction, motional, etc.)."

Eva Guillory 2E

Eva Guillory 2E

I'm confused on 4F.7 a, because I keep getting 6.65 J*K^-1 rather than 6.80 J*K^-1. Is this most likely due to rounding differences? If so, if anyone got 6.80 J*K^-1, can you mention what values you rounded to? Oh, and for reference, here is what my problem looks like, which also lines up with the s...

Eva Guillory 2E

I'm just curious, what are some common applications of thermodynamics in the work field? In addition, are there any specific examples of thermodynamics in relation to life sciences?

Edit: To clarify, I meant "work" in reference to occupation, not work in the thermodynamical sense.

Eva Guillory 2E

Honestly, it's kinda hard to come up with clever jokes for this thread. All the good ones argon.

Eva Guillory 2E

In addition, here is a chart with some common average bond enthalpies if you need it:

Eva Guillory 2E

No, I don't believe so.
Some further comments about this equation were made in the topic below:
viewtopic.php?f=129&t=41797&hilit=integral

Eva Guillory 2E

In addition, here is a chart with specific values pertaining to water:

Eva Guillory 2E

Regarding Isolated systems (other than the example of the entire universe, which Lavelle mentioned in class), is there any way we can prove that other so-called isolated systems are actually 100% isolated?

Eva Guillory 2E

I understand that when solids and liquids are concerned in relation to the reaction constant P, PΔV is considered insignificant, but why is a change in volume ignored in cases involving substances like water, which visibly increases in volume when frozen?

Eva Guillory 2E

Eva Guillory 2E

In this graph, the straight lines represent phase changes (where temperature is constant), and the slanted lines represent an increase in temperature.

Eva Guillory 2E

Eva Guillory 2E

In addition, when pure elements are in their standard states, their standard enthalpies of formation are equal to zero, which makes solving for the enthalpy of a reaction easier.

Eva Guillory 2E

Temperature indicates the random motion of particles.
Heat is the transfer of energy due to a temperature difference.

In summary, Temperature represents particle motion, and Heat represents energy transfer.

Eva Guillory 2E

Yes, it does apply to both forward and reverse reactions.

This forum post helps to flesh out why enthalpies vary depending of the method of calculation you use:
https://chemistry.stackexchange.com/que ... n-the-calc

Eva Guillory 2E

In addition, here is an article about the difference between heat and temperature, and why they're not interchangeable: https://www.khanacademy.org/science/chemistry/thermodynamics-chemistry/internal-energy-sal/a/heat In addition, http://www.physicstutorials.org/home/heat-temperature-and-thermal-exp...

Eva Guillory 2E

According to http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch5/work.php: "Heat and work are not state functions. Work can't be a state function because it is proportional to the distance an object is moved, which depends on the path used to go from the initial to the final state. If work...

Eva Guillory 2E

In addition, since K is equal to mol*L^-1 divided by mol*L^-1, the units will cancel out, leaving a unitless constant K.

Eva Guillory 2E

Yeah, it is probably best to just memorize the list of the 7 strong acids and 8 strong bases.
Here is a link to a list if you need it: http://www.austincc.edu/chemlab/strongacidbase

Eva Guillory 2E

I doubt you would get a whole lot of points taken off, but I know Professor Lavelle posted a resource on the class website going over sig fig rules if you want to brush up on them.

Eva Guillory 2E

According to google... torr = "a unit of pressure used in measuring partial vacuums, equal to 133.32 pascals" bar = "a unit of pressure equivalent to 100,000 newtons per square meter or approximately one atmosphere" atm = "a unit of pressure defined as 101,325 Pa" pasca...

Eva Guillory 2E

Actually, I don't think that an inert gas affects the equilibrium constant at all because if the pressure of a reaction vessel is increased by adding an inert gas, the moles of reactant/product and the volume remain constant. Essentially, unless there is a change in reactant/product concentration, t...

Eva Guillory 2E

If you look at page three of the syllabus, you will notice that 5G.5 is not included in the list of homework problems.

Eva Guillory 2E

If you look at page three of the syllabus, you will notice that 5G.5 is not included in the list of homework problems.

Eva Guillory 2E

Pure solids and liquids are not included in equilibrium constants because the molar concentration of those substances does not change in reactions. In the case of aqueous solutions, H2O is not included in the constant equation because the overall change in the solvent concentration is insignificant ...

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