Search found 17 matches

by Danny Nguyen 2H
Tue Mar 14, 2017 10:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 209
Views: 101159

Re: Saying Thank You to Dr. Lavelle

Dear Dr. Lavelle, Thank you for being a great professor. The way you teach chemistry is very concise and insightful which helps facilitate faster understanding of the topics. In addition, the puns and jokes you make while teaching makes it all the better. Thank you again for teaching us chemistry. B...
by Danny Nguyen 2H
Mon Mar 13, 2017 6:09 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Chair conformation
Replies: 4
Views: 455

Re: Chair conformation

Yes, that is correct and also to break through that boat formation the collision has to be strong enough to break through the energy barrier in order for it the ring flip to occur.
by Danny Nguyen 2H
Mon Mar 06, 2017 10:29 pm
Forum: *Organic Reaction Mechanisms in General
Topic: 14A subjects
Replies: 1
Views: 330

Re: 14A subjects

From what I've remember in class what I can recall is that he touched on lewis acid and bases, hybridization, and vsepr models. But these things he mentioned briefly so I'm not entirely sure if we really need to know them and sorry I can't recall the page numbers. There might be others things to tha...
by Danny Nguyen 2H
Wed Mar 01, 2017 10:02 pm
Forum: *Cycloalkenes
Topic: Naming
Replies: 3
Views: 394

Re: Naming

Yes! for your first question. After looking it up, its called a cyclo when it is joined up in any ring.
This is the site I got it from http://www.chemguide.co.uk/basicorg/con ... names.html if you look for the cyclo info you can get a more depth explanation of it.
by Danny Nguyen 2H
Wed Feb 22, 2017 6:51 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow vs Fast reaction
Replies: 1
Views: 240

Re: Slow vs Fast reaction

I think usually we should be given some sort of information for us to determine which is the slow or fast step; whether they tell us straight up that one is fast the other slow or through the k's and the larger one is the faster step.
by Danny Nguyen 2H
Sat Feb 18, 2017 3:57 pm
Forum: General Rate Laws
Topic: Unique Average Rate --> Rate Law [ENDORSED]
Replies: 2
Views: 286

Re: Unique Average Rate --> Rate Law [ENDORSED]

If you look on page 59 starting where it says "Think about this, if you want to write...", it basically starts from saying the rate of the reactants is equal and opposite of the rate of the products. So then we apply the problem above and the reaction for that particular one and from that ...
by Danny Nguyen 2H
Tue Feb 14, 2017 9:40 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Common Bond Enthalpies
Replies: 1
Views: 296

Re: Common Bond Enthalpies

I think like the first quiz we took we will be given them in the question or on a separate sheet like the formula sheet.
by Danny Nguyen 2H
Sat Feb 11, 2017 3:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Review Session
Replies: 1
Views: 202

Re: Midterm Review Session

Yes here is the link!! Scroll down to find it!!
viewtopic.php?f=160&t=18993
by Danny Nguyen 2H
Tue Feb 07, 2017 2:19 am
Forum: Student Social/Study Group
Topic: Study group for mid term
Replies: 4
Views: 625

Re: Study group for mid term

Hey, I am interested to study for the midterm. I was thinking meeting up on Sat to work on practice problems and then going to review session on Sunday??
by Danny Nguyen 2H
Wed Feb 01, 2017 6:35 pm
Forum: Calculating Work of Expansion
Topic: P delta(V) =delta(n)RT
Replies: 2
Views: 365

P delta(V) =delta(n)RT

When are we allowed to use this? under what circumstances do we use this? (refer to equation above)
by Danny Nguyen 2H
Tue Jan 31, 2017 10:29 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Resources
Replies: 3
Views: 317

Re: Resources

You could always find a study group or form one to work with or find tutoring like AAP.
by Danny Nguyen 2H
Mon Jan 23, 2017 5:01 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: "Favorable" chemical reaction
Replies: 3
Views: 517

Re: "Favorable" chemical reaction

The reason Professor Lavelle called it "favorable" because it's spontaneous; meaning the reaction is moving in a way that is "favorable" or in the natural direction. Like the example he gives with a rock in a valley. If the rock is on the edge, its rolling down the hill naturally...
by Danny Nguyen 2H
Sun Jan 22, 2017 3:22 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Significant Figure [ENDORSED]
Replies: 7
Views: 670

Re: Significant Figure [ENDORSED]

I think it's always safe to know significant figures and plus I heard for Lavelle's class he emphasizes a lot on sig figs. So I recommend you to review them.
by Danny Nguyen 2H
Sat Jan 21, 2017 2:45 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Exercise 8.19, proper use of equations?
Replies: 1
Views: 274

Re: Exercise 8.19, proper use of equations?

I think using the equation for q=(n) (Cv,m) (delta T) is the best for this question because it's asking to find the change in heat and the equation does just that. For the C values I'm pretty sure we will have to be given those values to solve the problem using the equation above. And [ deltaH = del...
by Danny Nguyen 2H
Wed Jan 18, 2017 5:30 pm
Forum: Phase Changes & Related Calculations
Topic: Steam Burns [ENDORSED]
Replies: 3
Views: 408

Re: Steam Burns [ENDORSED]

If you recall on the first day of lecture, the sub taught us about the basics of physical or phase change of water from a solid, liquid, and finally a gas. To get to a certain state, change in heat is required. Let's say we have some hot water that's coming to a boil and its at 30 degrees Celsius( t...
by Danny Nguyen 2H
Tue Jan 17, 2017 11:56 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question 8.31
Replies: 4
Views: 407

Re: Question 8.31

Hey, Marco interesting question. I looked more into it and in the textbook itself Section 8.10 pg 280-281 it gives the whole explantion on why for constant volume its (3/2)R and for constant pressure its (5/2)R. Hope that helped! and yes I assuming we should know these numbers.
by Danny Nguyen 2H
Thu Jan 12, 2017 11:46 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Reaction Enthalpy and Standard State
Replies: 2
Views: 190

Re: Standard Reaction Enthalpy and Standard State

Isn't it because it's in its natural state in the world so it's formula is that way. For your example N, nitrogen, exists in the real world as a gas, N2. Similar to the example given in lecture, oxygen exists in the real world as O2.

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