CHEMISTRY COMMUNITY

Marissa Petchpradub 2F

For this question, I understand that we must use the pre-equilibrium approach to get rid of the intermediate [ES] in the rate law. After doing this, we get k2(k1/k1')[E][S], but [E] is a catalyst and I thought we cannot have catalysts in the rate law as well as intermediates. Can someone please expl...

Marissa Petchpradub 2F

I believe you would first draw the staggered Newman Projection; then on the 3 bonds connected to carbon 1 (the front carbon on the Newman Projection) you would write H. For the 3 bonds connected to carbon 2 (the carbon in the back which is not visible on the Newman projection), you would write H for...

Marissa Petchpradub 2F

In this case, CF4 has the highest standard molar entropy because it is the most massive molecule (it contains 4 flourines). CH3F seems like it would have more positional molar entropy, but it has less mass than CF4.

Marissa Petchpradub 2F

A lot of the time it depends on the electronegativity of the elements in question. For example, if the carbon atom is connected to only one oxygen, it will have a smaller delta positive charge while the oxygen has a small delta negative charge. If the carbon atom is attached to two oxygens, it will ...

Marissa Petchpradub 2F

To add on, you draw the arrows from the bond to the element (which tends to be more electronegative) and draw arrows from the lone-pair electrons of an element (nucleophile, usually an ion) to the element that would be receiving the electrons.

Marissa Petchpradub 2F

Yes, I believe it is correct to assume we use the Pre-Equilibrium approach when the first elementary step in a reaction mechanism is fast.

Marissa Petchpradub 2F

Can someone please explain page 73 in the course reader? How did we know that step 2 was the slow step?

Marissa Petchpradub 2F

We would use inert electrodes when the elements of one half reaction (or both) are in the same state (both aqueous) or when the states are aqueous and gas. In other words, we would need to use a Platinum electrode when there is no solid present.

Marissa Petchpradub 2F

Our quizzes are usually handed back to us by our TA!

Marissa Petchpradub 2F

I believe derivations would be fair game for any quiz or midterm, so know them just in case.

Marissa Petchpradub 2F

I believe molar heat capacity would be considered an intensive property. It is defined as "heat required to raise the temperature of 1 mole of substance by 1 degree Celsius," therefore, since it is the heat needed for SPECIFICALLY 1 mole of substance. Molar heat capacity values do not depe...

Marissa Petchpradub 2F

Hi Maya,

I found Ashley and Sean to be really helpful in explaining difficult concepts!

Marissa

Marissa Petchpradub 2F

I know that you would use the DeBroglie equation when dealing with particles that have a measurable mass, such as an electron. The equations E=hv and lambda=hc/E would be used when dealing with massless particles.

Hope this somewhat helps!

Marissa Petchpradub 2F

I'm in De Neve Fir and definitely would want to join!

Marissa Petchpradub 2F

I'm in De Neve Fir and definitely interested in joining!!

CHEMISTRY COMMUNITY

Search found 15 matches

2015 Final 6B

Re: Help Drawing Newman Projections

Re: Increasing Standard Molar Entropy

Re: Identifying the nucleophile or electrophile

Re: Arrows

Re: Steady-State Approach vs. Pre-Equilibrium Approach [ENDORSED]

Pre-Equilibrium Approach

Re: Inert Electrodes

Re: Quiz 1 Results

Re: Proving equations

Re: Molar Heat Capacity

Re: UA Preferences

Re: Wavelength of Ejected Electron [ENDORSED]

Re: De Neve Study Group

Re: Rieber Hall 14A Study Group (Fall 2016)