Search found 27 matches

by Lyndon_Bui_3J
Sun Mar 19, 2017 10:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Switching Chem 14C discussion
Replies: 7
Views: 770

Re: Switching Chem 14C discussion

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.
by Lyndon_Bui_3J
Thu Mar 16, 2017 9:35 am
Forum: Administrative Questions and Class Announcements
Topic: Final Exam Details and Review Sessions Winter 2017
Replies: 114
Views: 13581

Re: Final Exam Details and Review Sessions Winter 2017

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.
by Lyndon_Bui_3J
Thu Mar 16, 2017 9:27 am
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 209
Views: 100830

Re: Saying Thank You to Dr. Lavelle

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...
by Lyndon_Bui_3J
Sat Mar 11, 2017 11:43 am
Forum: *Electrophilic Addition
Topic: number of steps [ENDORSED]
Replies: 2
Views: 588

Re: number of steps [ENDORSED]

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.
by Lyndon_Bui_3J
Sat Mar 11, 2017 11:41 am
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Kilocalories kcal vs normal calories
Replies: 1
Views: 358

Re: Kilocalories kcal vs normal calories

The food calorie, denoted "Cal" or "Calorie" is the same as a kilocalorie or "kcal" which is equivalent to 1000 small calories (cal).
by Lyndon_Bui_3J
Fri Mar 03, 2017 10:29 am
Forum: *Nucleophiles
Topic: NH3+ as a nucleophile & Determining if Nucleo/Electrophile
Replies: 2
Views: 559

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

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.
by Lyndon_Bui_3J
Wed Mar 01, 2017 3:21 pm
Forum: *Alkanes
Topic: Number in front of name
Replies: 2
Views: 337

Number in front of name

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?
by Lyndon_Bui_3J
Thu Feb 23, 2017 6:01 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Winter 2017
Replies: 87
Views: 14406

Re: Midterm Winter 2017

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...
by Lyndon_Bui_3J
Tue Feb 21, 2017 12:51 am
Forum: General Rate Laws
Topic: Integrated Rate Law
Replies: 1
Views: 226

Re: Integrated Rate Law

No they are the same. One is in natural log form, and the other isn't but they are the same equations.
by Lyndon_Bui_3J
Sat Feb 18, 2017 1:55 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1013760

Re: Post All Chemistry Jokes Here

What do you call an acid with an attitude?

A-mean-oh acid!
by Lyndon_Bui_3J
Sat Feb 11, 2017 12:18 am
Forum: Administrative Questions and Class Announcements
Topic: Derivations
Replies: 3
Views: 405

Re: Derivations

Most of the time, he does not ask for full derivations, but he might for simpler ones.
by Lyndon_Bui_3J
Fri Jan 27, 2017 11:19 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Definition of Gibbs free energy
Replies: 1
Views: 312

Definition of Gibbs free energy

I understand the calculations involved in Gibbs free energy but what is it conceptually?
by Lyndon_Bui_3J
Mon Jan 23, 2017 9:26 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Positional Entropy
Replies: 1
Views: 275

Re: Positional Entropy

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...
by Lyndon_Bui_3J
Sat Jan 14, 2017 9:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Workbook quizzes
Replies: 2
Views: 374

Workbook quizzes

Hello Professor Lavelle,
I was just wondering why aren't there workbook quizzes that can help our grade this quarter? Thanks!
by Lyndon_Bui_3J
Sat Jan 14, 2017 9:47 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy
Replies: 4
Views: 497

Re: Enthalpy

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...
by Lyndon_Bui_3J
Tue Nov 29, 2016 10:57 am
Forum: Bronsted Acids & Bases
Topic: Identifying Strong/Weak Acids/Bases
Replies: 1
Views: 303

Re: Identifying Strong/Weak Acids/Bases

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.
by Lyndon_Bui_3J
Wed Nov 16, 2016 12:15 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1013760

Re: Post All Chemistry Jokes Here

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

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

.. just kiddin you're awesome:) <3
by Lyndon_Bui_3J
Mon Nov 14, 2016 9:23 pm
Forum: Ideal Gases
Topic: Quiz 3 Content [ENDORSED]
Replies: 1
Views: 361

Re: Quiz 3 Content [ENDORSED]

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.
by Lyndon_Bui_3J
Mon Nov 14, 2016 9:19 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Quiz 3 Prep Fall 2015 Q#10
Replies: 1
Views: 273

Re: Quiz 3 Prep Fall 2015 Q#10

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...
by Lyndon_Bui_3J
Sun Nov 13, 2016 6:11 pm
Forum: Naming
Topic: Alphabetical order of ligands
Replies: 1
Views: 227

Alphabetical order of ligands

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!
by Lyndon_Bui_3J
Sun Oct 30, 2016 11:51 pm
Forum: Hybridization
Topic: DIfference between axial and equatorial lone pairs
Replies: 1
Views: 2029

Re: DIfference between axial and equatorial lone pairs

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...
by Lyndon_Bui_3J
Sat Oct 22, 2016 5:33 pm
Forum: Coordinate Covalent Bonds
Topic: Polar Covalent vs. Unequally Shared
Replies: 3
Views: 804

Re: Polar Covalent vs. Unequally Shared

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.
by Lyndon_Bui_3J
Mon Oct 17, 2016 12:48 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1013760

Re: Post All Chemistry Jokes Here

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

A one molar solution!!!
by Lyndon_Bui_3J
Tue Oct 11, 2016 11:24 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Minimum Indeterminacy [ENDORSED]
Replies: 6
Views: 946

Re: Minimum Indeterminacy [ENDORSED]

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...
by Lyndon_Bui_3J
Wed Oct 05, 2016 12:31 am
Forum: Photoelectric Effect
Topic: Wavelength Intensity [ENDORSED]
Replies: 1
Views: 357

Wavelength Intensity [ENDORSED]

Why does increasing the intensity of light after surpassing the threshold energy eject more electrons from the metal?
by Lyndon_Bui_3J
Wed Sep 28, 2016 11:57 pm
Forum: Balancing Chemical Reactions
Topic: How familiar should we be with Naming compounds? [ENDORSED]
Replies: 8
Views: 1231

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

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?

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