Search found 15 matches

by Marissa Petchpradub 2F
Sat Mar 18, 2017 8:06 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: 2015 Final 6B
Replies: 1
Views: 335

2015 Final 6B

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...
by Marissa Petchpradub 2F
Mon Mar 13, 2017 7:31 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Help Drawing Newman Projections
Replies: 2
Views: 312

Re: Help Drawing Newman Projections

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...
by Marissa Petchpradub 2F
Mon Mar 13, 2017 7:19 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Increasing Standard Molar Entropy
Replies: 1
Views: 445

Re: Increasing Standard Molar Entropy

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.
by Marissa Petchpradub 2F
Mon Mar 06, 2017 7:19 pm
Forum: *Electrophiles
Topic: Identifying the nucleophile or electrophile
Replies: 2
Views: 538

Re: Identifying the nucleophile or electrophile

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 ...
by Marissa Petchpradub 2F
Sun Mar 05, 2017 10:29 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Arrows
Replies: 4
Views: 395

Re: Arrows

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.
by Marissa Petchpradub 2F
Sat Feb 25, 2017 10:16 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Steady-State Approach vs. Pre-Equilibrium Approach [ENDORSED]
Replies: 2
Views: 320

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

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.
by Marissa Petchpradub 2F
Sun Feb 19, 2017 10:56 am
Forum: General Rate Laws
Topic: Pre-Equilibrium Approach
Replies: 1
Views: 251

Pre-Equilibrium Approach

Can someone please explain page 73 in the course reader? How did we know that step 2 was the slow step?
by Marissa Petchpradub 2F
Mon Feb 13, 2017 9:35 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Inert Electrodes
Replies: 1
Views: 266

Re: Inert Electrodes

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.
by Marissa Petchpradub 2F
Sun Feb 05, 2017 11:39 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Results
Replies: 2
Views: 396

Re: Quiz 1 Results

Our quizzes are usually handed back to us by our TA!
by Marissa Petchpradub 2F
Sun Jan 29, 2017 3:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Proving equations
Replies: 2
Views: 329

Re: Proving equations

I believe derivations would be fair game for any quiz or midterm, so know them just in case.
by Marissa Petchpradub 2F
Sun Jan 22, 2017 10:03 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Molar Heat Capacity
Replies: 4
Views: 494

Re: Molar Heat Capacity

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...
by Marissa Petchpradub 2F
Thu Jan 12, 2017 3:29 pm
Forum: Administrative Questions and Class Announcements
Topic: UA Preferences
Replies: 4
Views: 664

Re: UA Preferences

Hi Maya,

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

Marissa
by Marissa Petchpradub 2F
Wed Oct 05, 2016 11:48 am
Forum: DeBroglie Equation
Topic: Wavelength of Ejected Electron [ENDORSED]
Replies: 3
Views: 498

Re: Wavelength of Ejected Electron [ENDORSED]

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!
by Marissa Petchpradub 2F
Thu Sep 29, 2016 2:57 pm
Forum: Student Social/Study Group
Topic: De Neve Study Group
Replies: 35
Views: 2253

Re: De Neve Study Group

I'm in De Neve Fir and definitely would want to join!
by Marissa Petchpradub 2F
Wed Sep 28, 2016 11:30 pm
Forum: Student Social/Study Group
Topic: Rieber Hall 14A Study Group (Fall 2016)
Replies: 49
Views: 4421

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

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

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