Dr. Lavelle,
Thank you for all the resources and knowledge that you have given us. You have not only been able to make chemistry interesting but also easy to understand!
Sincerely,
Nick Pantoja
Search found 25 matches
- Sun Mar 19, 2017 9:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 621690
- Sat Mar 18, 2017 3:08 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: 3 different subsitutients for a newman projection
- Replies: 1
- Views: 1216
3 different subsitutients for a newman projection
For a molecule that has 3 different subsitituients on the carbon that you are analyzing for the newsman projection, do you have tp draw the substituents in a specific order. Like would you have to look at the molecule structure.
- Sat Mar 11, 2017 6:17 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: staggered and eclipsed conformations
- Replies: 1
- Views: 419
staggered and eclipsed conformations
do we only need to know eclipsed and staggered conformations for ethane and butane? if not, are the other conformations the same as those we learned for those two? thanks
- Fri Mar 03, 2017 3:21 pm
- Forum: *Free Energy of Activation vs Activation Energy
- Topic: Graphs of Gibbs Free Energy vs. Energy
- Replies: 2
- Views: 653
Re: Graphs of Gibbs Free Energy vs. Energy
I also believe if it is talking about activation energy then the reaction profile will be energy on the y-axis, while if they give you standard free energy of activation then the y axis would be gibbs free energy
- Thu Feb 23, 2017 2:14 pm
- Forum: *Electrophiles
- Topic: electrophile vs neutrophile
- Replies: 2
- Views: 741
electrophile vs neutrophile
i know that electrophile (based on the root words) likes electrons, does that mean it is positive and wants a negative value, or that its negative and wants a positive value. thank you.
- Thu Feb 16, 2017 3:13 pm
- Forum: General Rate Laws
- Topic: Order equations
- Replies: 2
- Views: 537
Order equations
What in a question tells you if a kinetic reaction is zero order, 1st order, or 2nd order?
- Thu Feb 09, 2017 3:43 pm
- Forum: Balancing Redox Reactions
- Topic: Redox Memorization Tips
- Replies: 4
- Views: 1941
Re: Redox Memorization Tips
To memorize what is getting oxidized and reduced.. follow the acronym LEO goes GER.
Loses
Electrons
Oxidized
Gains
Electrons
Reduction
This is important to get right because if you mix them up then the whole problem is incorrect.
Loses
Electrons
Oxidized
Gains
Electrons
Reduction
This is important to get right because if you mix them up then the whole problem is incorrect.
- Thu Feb 02, 2017 3:44 pm
- Forum: Balancing Redox Reactions
- Topic: reduction vs. oxidation
- Replies: 3
- Views: 826
reduction vs. oxidation
I have a general question on how to differentiate between what's being reduced and what is being oxidized. So within a chemical equation, how can you tell what the oxidizing number is from the equation and then determine if it is being reduced or oxidized?
- Thu Jan 26, 2017 3:49 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Entropy moles
- Replies: 2
- Views: 647
Re: Entropy moles
THANK YOU SO MUCH! that solved the problem. that makes so much sense.
- Thu Jan 26, 2017 3:48 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Entropy moles
- Replies: 2
- Views: 647
Entropy moles
In a particular problem on the homework, it gave the values of delta s subscript m, when trying to calculate gibbs free energy, (specifically the change in entropy within the equation) however the chemical equation had 2 moles of it so the solution divided the given delta s values by 2. why is that?
- Sat Jan 21, 2017 2:20 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: definition of isothermic reversible expansion [ENDORSED]
- Replies: 1
- Views: 631
definition of isothermic reversible expansion [ENDORSED]
What does isothermic reversible expansion mean?
- Fri Jan 13, 2017 5:39 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpies vs standard enthalpies of formation
- Replies: 1
- Views: 349
Bond Enthalpies vs standard enthalpies of formation
What is the main clue on whether to use bond enthalpies vs standard enthalpies of formation in a problem to calculate the net enthalpy? I feel that both are similar and I'm not sure what to look for as in approaching the problem.
- Wed Nov 30, 2016 2:31 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: moles of [oh-]
- Replies: 1
- Views: 525
moles of [oh-]
in one homework assignment, it gave a compound Ba(OH)2 and then it said that the moles of OH was .033 moles however when using ice tables, it used .066. did it use .066 bc there were two things of it?
- Sun Nov 20, 2016 2:00 pm
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Acidity constants [ENDORSED]
- Replies: 2
- Views: 936
Re: Acidity constants [ENDORSED]
yes and so is the dissociation constant
- Fri Nov 11, 2016 2:54 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Order of Filling and Removing Electrons in M.O. Diagrams
- Replies: 1
- Views: 669
Re: Order of Filling and Removing Electrons in M.O. Diagrams
When the z<8 and if the M.O. is heteronuclear, the order is placed as such: sigma, anti bonding sigma, pi bonds, sigma, pi anti bonds, and then sigma anti bonds for z>8: sigma, sigma antibond, sigma, pi, pi antibond, sigma. if there is a heteronuclear compound the one that is more electronegative is...
- Fri Nov 11, 2016 2:46 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Equilibrium Constant vs Reaction Quotient [ENDORSED]
- Replies: 4
- Views: 1626
Re: Equilibrium Constant vs Reaction Quotient [ENDORSED]
And with those Q and K values, you will be able to compare and see which side is favored.
- Thu Nov 03, 2016 10:24 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: countingg unpaired electrons in M.O. theory
- Replies: 1
- Views: 541
countingg unpaired electrons in M.O. theory
In molecular theory, how do we count how many unpaired electrons there are? I'm kind of confused on the whole molecular theory as well. And as to why we use it.
- Tue Oct 25, 2016 11:15 pm
- Forum: Lewis Structures
- Topic: Lewis Structure Octet Rule Exceptions
- Replies: 4
- Views: 957
Re: Lewis Structure Octet Rule Exceptions
P, S, Cl can have expanded 8e-. However, Typically Cl is not a central atom as it has a high ionization energy.
- Fri Oct 21, 2016 10:29 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Placing elements in Lewis diagram
- Replies: 1
- Views: 420
Placing elements in Lewis diagram
In the chapter homework, I would draw the Lewis diagrams with the correct number of bonds. But the positioning of the atoms are different. For example, I would attach an O to the top of a C instead of the left side (as seen in the book); would MY answer still be correct, as long as they are symmetri...
- Fri Oct 14, 2016 8:59 am
- Forum: Hybridization
- Topic: Memorization Tricks
- Replies: 9
- Views: 5392
Re: Memorization Tricks
Also someone had told me this cool memorization trick for SI units.
"Good Models Know How Dunkin Donuts Can Make U Not Petit
Giga, Mega, Kilo, Hecto, Deca, Deci, Centi, Milli, Micro (symbol looks like a “U”), Nano, Pico"
"Good Models Know How Dunkin Donuts Can Make U Not Petit
Giga, Mega, Kilo, Hecto, Deca, Deci, Centi, Milli, Micro (symbol looks like a “U”), Nano, Pico"
- Fri Oct 14, 2016 12:35 am
- Forum: Hybridization
- Topic: Memorization Tricks
- Replies: 9
- Views: 5392
Re: Memorization Tricks
Flashcards are always a good way to memorize things.
- Wed Oct 05, 2016 3:42 pm
- Forum: SI Units, Unit Conversions
- Topic: SI Units/conversions memorization [ENDORSED]
- Replies: 4
- Views: 2346
SI Units/conversions memorization [ENDORSED]
Are there an easy ways to memorize the different conversions? I find it hard to remember the different conversions, like putting J in terms of Kg s and m. Etc.
- Sun Oct 02, 2016 4:33 pm
- Forum: Properties of Light
- Topic: Ch. 1.15 hw help
- Replies: 2
- Views: 456
Ch. 1.15 hw help
The hw question is "In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the value of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line." According to the textbook, they say the rydb...
- Fri Sep 30, 2016 12:06 pm
- Forum: Student Social/Study Group
- Topic: Rieber Hall 14A Study Group (Fall 2016)
- Replies: 49
- Views: 10242
Re: Rieber Hall 14A Study Group (Fall 2016)
Would love to join, even though I'm all the way up in Hitch.
- Sun Sep 25, 2016 1:02 pm
- Forum: SI Units, Unit Conversions
- Topic: Including Units in a Problem
- Replies: 3
- Views: 844
Re: Including Units in a Problem
I think it is always a good idea to show units throughout the problem just for you to know what the unit of measurement is/ keep track what you need in the final answer. It's always better to be safe and just use them throughout the problem. In regards to if its required, I'm not entirely sure.