CHEMISTRY COMMUNITY

Lyndon_Bui_3J

dayannaramirez_1J wrote:I'm interested in having the 11:00 class. Is it possible to switch, and if so, how do you do it? Anyone willing to take the 8:00 am off my hands?? :((

I don't think there is an 11:00 class.

Lyndon_Bui_3J

Nilla Sivakumar 2H wrote:Not particularly related to the final itself, but for future reference - will we still have access to Chemistry Community after this quarter ends?

Chem community is a public site, so you do not even need an account to see the forum posts and replies.

Lyndon_Bui_3J

Thank you for your undying passion and dedication to us students! We are all so lucky to have you as our teacher. I have learned so much for you, and I truly appreciate how much time and energy you spend on us. Your love for chemistry is contagious, and really helps make the lectures engaging and fu...

Lyndon_Bui_3J

I think the names "electrophilic addition" and "SN2" just refer to what exactly is being added or substituted. I do not think it specifies any information about the number of steps.

Lyndon_Bui_3J

The food calorie, denoted "Cal" or "Calorie" is the same as a kilocalorie or "kcal" which is equivalent to 1000 small calories (cal).

Lyndon_Bui_3J

Yes, it is usually best to draw the lewis structure. This will make any regions of electron density more clear so you can easily tell whether or not it is an electrophile or a nucleophile.

Lyndon_Bui_3J

I understand 4-methyl-octane has the 4 in front because the substituent is attached to the 4th carbon, but how will we know which carbon the substituent is attached to? Will it always be shown?

Lyndon_Bui_3J

If I got a wrong answer in question 5 part a, and then used that wrong answer correctly in part b, should I have gotten full credit for part b, or minus one point for part b? I already lost 4 points in part a, so I feel like losing a point in part b is getting punished twice.. Anyone know how this s...

Lyndon_Bui_3J

No they are the same. One is in natural log form, and the other isn't but they are the same equations.

Lyndon_Bui_3J

What do you call an acid with an attitude?

A-mean-oh acid!

Lyndon_Bui_3J

Most of the time, he does not ask for full derivations, but he might for simpler ones.

Lyndon_Bui_3J

Does anyone know if we have to know these equations for the test?

Lyndon_Bui_3J

I understand the calculations involved in Gibbs free energy but what is it conceptually?

Lyndon_Bui_3J

I think positional and thermal entropy are based on different things, so they are both entropies but they are not the same. Therefore, positional entropy depends solely on the position, while thermal entropy is more dependent on the movement of the particles. I think thermal entropy depends on tempe...

Lyndon_Bui_3J

Hello Professor Lavelle,
I was just wondering why aren't there workbook quizzes that can help our grade this quarter? Thanks!

Lyndon_Bui_3J

A state function refers to a quantity that can be determined using the final and initial states only. State functions are path independent. Enthalpy is a state function because the delta H or change in enthalpy can be calculated using the final enthalpy and initial enthalpy. This is useful because i...

Lyndon_Bui_3J

There are not many strong acids, so it is easiest to memorize the main strong acids and strong bases like HCl, HF, NaOh, etc. There is a general rule that organic acids (with carbon) tend to be weak, but that is not always the case.

Lyndon_Bui_3J

Professor Lavelle,
You are a perfect 10!!!!

... on the ph scale cause you're pretty BASIC!!

.. just kiddin you're awesome:) <3

Lyndon_Bui_3J

Even though the practice quiz has things past page 4 of chem equilibrium, the real quiz should only have things up to and including page 4 of chem equilibrium.

Lyndon_Bui_3J

Short method: There is one mole of gas on the left (reactant) side and 2 moles of gas on the right (product side). Increasing pressure shift reaction to the side with less moles of gas, which in this case is the left (reactant) side. Thus, the reverse reaction is favored and the concentration of Cl2...

Lyndon_Bui_3J

On toolbox 17.1, there is an example that names a complex thiocyanato(kN)pentaaqua(III) iron. Why isn't pentaaqua before thiocyanato if ligands are supposed to be alphabetical? Also why is the "(III)" after aqua? Thanks!

Lyndon_Bui_3J

Hey Nikki, the best way to think about it is like the equator on the Earth. If you imagine a molecule with the central atom as the center of the earth, the equatorial atoms or lone pairs lie on the horizontal plane through the middle, just like the equator. The axial atoms or lone pairs lie on the v...

Lyndon_Bui_3J

I am pretty sure that if a covalent bond has unequally shared electrons then it is a polar covalent bond. So they are the same I think. The unequal sharing is caused by differences in electronegativity that cause an electric dipole moment.

Lyndon_Bui_3J

What do you call a tooth in a cup of water?

A one molar solution!!!

Lyndon_Bui_3J

So you want to use the equation ΔpΔx=h/4pi. The equation is normally with a greater than or equal to sign, but since it says minimum, just use equal sign. The minimum indeterminacy of position is Δx, so you just solve for Δx using plancks constant (h) and plugging in the rest. Δp=mΔv, because moment...

Lyndon_Bui_3J

Why does increasing the intensity of light after surpassing the threshold energy eject more electrons from the metal?

Lyndon_Bui_3J

Will we need to know how to use prefixes and suffixes like hypo, ous, ic, etc. from our own reading and reviewing or will that be covered in class/discussion?

CHEMISTRY COMMUNITY

Search found 27 matches

Re: Switching Chem 14C discussion

Re: Final Exam Details and Review Sessions Winter 2017

Re: Saying Thank You to Dr. Lavelle

Re: number of steps [ENDORSED]

Re: Kilocalories kcal vs normal calories

Re: NH3+ as a nucleophile & Determining if Nucleo/Electrophile

Number in front of name

Re: Midterm Winter 2017

Re: Integrated Rate Law

Re: Post All Chemistry Jokes Here

Re: Derivations

Re: Different Versions of the Nernst Equation

Definition of Gibbs free energy

Re: Positional Entropy

Workbook quizzes

Re: Enthalpy

Re: Identifying Strong/Weak Acids/Bases

Re: Post All Chemistry Jokes Here

Re: Quiz 3 Content [ENDORSED]

Re: Quiz 3 Prep Fall 2015 Q#10

Alphabetical order of ligands

Re: DIfference between axial and equatorial lone pairs

Re: Polar Covalent vs. Unequally Shared

Re: Post All Chemistry Jokes Here

Re: Minimum Indeterminacy [ENDORSED]

Wavelength Intensity [ENDORSED]

Re: How familiar should we be with Naming compounds? [ENDORSED]