CHEMISTRY COMMUNITY

Tatum_Bernat_1E

Hello! I still do not understand how to label the type of mechanism or reaction when referring to electrophilic addition and others. Is it the number of steps or type of steps? How do I differentiate the different types? Thanks in advance!

Tatum_Bernat_1E

Cowasjee_Sanaea_3E wrote:For the first question, how do you know it is 4- isopropyldecane? I thought that it was just 4-propyldecane

Can someone please address this? Why do we need the "iso" prefix? Isn't it just a propyl functional group attached to the 4th carbon of a decane compound?

Tatum_Bernat_1E

How are enthalpy and temperature directly proportional? (How would an increase in one, lead to an increase in the other? Or a decrease?)

Tatum_Bernat_1E

I am confused when to use different delta H values. For example, in a problem that says to calculate the heat gained or lost by superheated steam during condensation with constant pressure, why do we use delta H(vap)? Is it because we are dealing with steam? Aren't we talking about condensation and ...

Tatum_Bernat_1E

Hello! I am still very lost in the concept of finding standard entropy of vaporization. On my version of the quiz, there was a question regarding this and I am still having trouble understanding how to solve it. The question was as following: For H20, standard delta H(vap, m) = 44.0 kJ/mol at T(vap)...

Tatum_Bernat_1E

I'm not sure if it's correct, but when I went to one of the review sessions one of the TA's called it a little mountain (with each side building up to the salt bridge). Meaning compounds without a charge leading to ones with slightly more positive charge to ions with an even more positive charge to ...

Tatum_Bernat_1E

Today in class, professor Lavelle went through how to understand that n would be 1 intuitively in an example from the course reader. In the course reader, it then proceeds how to get the number mathematically. I follow the math but I failed to understand how he knew the value of n before doing the m...

Tatum_Bernat_1E

In the solutions manual, it says to note that the absolute entropies of the elements are not 0, and that the entropy change for the reaction in which a compound is formed from the elements is also not 0. Can someone please explain why both parts are not 0 please? (and when they would be 0)? Please :)

Tatum_Bernat_1E

Hello there! On page 36 of the course reader, it is discussing why the change in gibbs free energy and how this relates to the spontaneity of a reaction. The course reader says to divide the equation Gsys =Hsys -TSsys by -T to get the equation [-(Gsys)/T] =Ssurr +Ssys. I do not understand how this i...

Tatum_Bernat_1E

Can someone explain how the equations for an irreversible and reversible reaction differ conceptually? I understand how with the reversible process reactants can be formed again, but how can this be explained through the equations? What makes each equation reversible or not?

Tatum_Bernat_1E

Did anyone happen to write down how to sign up for AAP Peer Learning and if it is not too late to sign up?

Tatum_Bernat_1E

In the most recent email sent out, it states the final will have no derivations. Can you expand on what this is referring to or what you mean by this?

Tatum_Bernat_1E

When setting up the ICE box for reactions that have molecules with mole ratios that aren't 1:1 (so like 1:2..etc), do you only add 2x when creating a value for the change in molecular concentration, only square the value when at the K step, or square 2x at the K step? If my question seems unclear, I...

Tatum_Bernat_1E

In discussion we drew the molecular orbital diagram for OF and NF. In the OF diagram, the sigma 2p bond is below the pi 2p bond (and vice versa for the NF diagram). Can someone please explain by these two switch depending on which atoms are bonding? I thought it had something to do with the amount o...

Tatum_Bernat_1E

How would you write an equilibrium constant expression a reaction where the reactants/products are in aqueous solutions or are solid?

Tatum_Bernat_1E

Another way to look at it is to look at bonding in terms of waves, because the particles are moving so quickly it's more of a region of probability. You can think of it in the sense of constructive and destructive interference. Two areas where the electron has a high probability of occurring creates...

Tatum_Bernat_1E

I think I remember Dr. Lavelle saying the molecular orbital theory also helps determine the energy differences within a molecule, but I'm not entirely sure.

Tatum_Bernat_1E

Regarding Jasmin's question... Page 79 of the course reader instructs us to choose the atom with the lowest ionization energy as the central atom. The nitrogen in ammonium would be the central atom, because of its low ionization energy compared to hydrogen's. (Not to mention hydrogen is never the ce...

Tatum_Bernat_1E

Reading all these jokes, I think this class is going to be a (pro)ton of fun this year with Mr. Lavelle!

Tatum_Bernat_1E

Hello! According to my understanding, (and page 63 in the reader), the magnetic quantum number relates back to your angular momentum quantum number, l. The magnetic quantum number can always be the positive and negative value of the angular momentum quantum number, l. Additionally, the numbers count...

Tatum_Bernat_1E

Hey Everyone! I'm also in Sproul Hall. It doesn't seem like much has been accomplished on planning this study group, but I am very interested in joining. We need times and dates! Personally, I'm usually free on Sundays and during most of the day Tuesdays. If these sound good to other people, I can t...

CHEMISTRY COMMUNITY

Search found 21 matches

Electrophilic Addition versus Substitution

Re: Quiz 3 Winter 2017

Entalpy related to Temperature

When to use different enthalpy values

Quiz 1 Question 3 Standard Entropy of Vaporization

Re: Cell Diagrams

Understanding n intuitively

Exercise 9.37 (Absolute Entropies)

Gibbs Free Energy Equation Related to S(universe)

Re: Irreversible and reversible reactions

Re: Tutoring? [ENDORSED]

Re: Final Exam Details and Review Sessions Fall 2016

General ICE Box Question in Reference to Quiz 3

pi 2p bonds or sigma 2p bonds [ENDORSED]

Equilibrium Constant Expressions

Re: Bonding vs Antibonding

Re: Molecular Orbital theory

Re: Lewis Structures

Re: Post All Chemistry Jokes Here

Re: Magnetic Quantum Number [ENDORSED]

Re: Sproul Hall Chem14A Study Group