CHEMISTRY COMMUNITY

Angela To 2B

I think it's that alcohols are specifically R-OH while hydroxyl groups can be other things that aren't carbon chains. For example water (H-OH)! (Or NaOH and KOH, etc.) We didn't cover this in class, but in regards to naming, we've been adding the suffix -ol to name molecules with an alcohol function...

Angela To 2B

Emma Cole 3F wrote:What equations should we know how to derive for the final exam?

There will be no derivations on the final! :)

Angela To 2B

Melanie Martinez 1K wrote:Will questions/concepts discussed here on Chemistry Community be part of the final? If so, would the topics be those with much discussion?

Yes, Dr. Lavelle said in lecture today that topics of discussion will also be covered on the final!

Angela To 2B

Madeline Fox 2B wrote:Can someone explain why question 10 is false? I thought half-lives are always the same.

I think half-lives are the same for only 1st order reactions

Angela To 2B

Is there a difference between using ln vs log in the equation? Because the solutions manual and the course reader has written it both ways.

Angela To 2B

To add onto what Diana said, a single line also represents that the two phases are in contact with each other, whereas the double lines represent the salt bridge!

Angela To 2B

Yes, I think Faraday's constant is supposed to be 96,485.3 C/mol! That's what my TA used during my discussion. (Although she left off the 0.3 at the end, but I'm sure the answers are close enough)

Angela To 2B

It's your R value! It should be 8.206 * 10^-2 L*atm/mol*K

Angela To 2B

Q: What do chemists call a benzene ring with iron atoms replacing the carbon atoms?

A: A ferrous wheel.

Angela To 2B

The salt bridge is necessary for the anions (after reduction at the cathode) to go back to the anode. If there's no circuit then the reaction won't work!

I posted a topic with a link to a song that might help you understand!

Angela To 2B

Hi everyone! This isn't exactly a question or an answer, but I thought this could be helpful to some people who are confused about voltaic cells. My AP chemistry teacher in high school played this in class and my whole class was basically singing the chorus for the AP frq! :') https://www.youtube.co...

Angela To 2B

In the example, you are trying to find the temperature at which the reaction is spontaneous. That's when delta G is negative. We set delta G to zero in order to find the temperature at which delta G is zero. In this case, that temperature was 333K. This means that for the reaction to be spontaneous,...

Angela To 2B

An intensive property is one that doesn't depend on the amount of material present! (An intensive property doesn't change when you take away or add some of the material/sample). An example would be boiling point; the boiling point of water doesn't change when the amount of water changes.

Angela To 2B

When deciding on which equation(s) to flip, I think it's easier to know if you look at the reactions you're originally given, balance them, and then compare it to the reaction you want to end up with. Then you can manipulate the reactions given to look like the final reaction! For example, question ...

Angela To 2B

The temperature should be in Kelvin because for the P(DELTA)V=(DELTA)nRT equation, the units of R is in J/mol*K !

Angela To 2B

To add onto that, it's because for standard enthalpy of formation, you want elements in their most stable phase. (which in a lot of cases is what form they come in). For the example of O2, if you want O2 in its most stable phase, it would just be O2. This would be O2(g) --> O2(g). Because it's not c...

Angela To 2B

Enthalpy is considered a state function because it is NOT path dependent. Enthalpy is defined as delta H which is the change in H (which we can refer to as H final - H initial)! Therefore it's a state function because we care about the final and initial (since delta H is the difference in H), rather...

Angela To 2B

My TA said that we should be posting at least once a week for 1 point each! Both questions and answers count towards the point. :)

Angela To 2B

If your question is what Shailyn is mentioning, then it's basically what Cliff said! During phase changes, bonds are broken which require energy (and heat is a form of energy)! If you look at a phase change graph, the areas with a horizontal line shows how much energy it can absorb before the sample...

Angela To 2B

I don't think so. I think it's just supposed to be the course reader and the "Introduction to Organic Chemistry" book if you bought that as well. (Or if you bought the book of past midterms/finals compilation book too). The practice problems and practice midterms are in the course reader i...

CHEMISTRY COMMUNITY

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Re: difference between hydroxy and alcohol

Re: Final Exam Details and Review Sessions Winter 2017

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Electrochemistry - Voltaic Cells

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