Search found 16 matches

by Daniel_Callos_4I
Thu Dec 01, 2016 2:55 pm
Forum: Administrative Questions and Class Announcements
Topic: Memorization of Acids and Bases
Replies: 2
Views: 408

Memorization of Acids and Bases

Which acids and bases should we have memorized for the final?
by Daniel_Callos_4I
Thu Dec 01, 2016 12:38 pm
Forum: Bronsted Acids & Bases
Topic: Acid/Base List from Course Reader
Replies: 1
Views: 304

Acid/Base List from Course Reader

Does anyone have the acid/base list from the course reader? If so I would appreciate if you could post it.
by Daniel_Callos_4I
Tue Nov 15, 2016 5:47 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: What is MO theory for? [ENDORSED]
Replies: 20
Views: 6636

Re: What is MO theory for? [ENDORSED]

MO theory is also useful for predicting which atom could be most prone to bonding based on the higher contribution to the LUMO, as well as reactivity based on lone pairs in the molecular orbitals.
by Daniel_Callos_4I
Sun Nov 06, 2016 3:05 pm
Forum: Naming
Topic: Nomenclature
Replies: 1
Views: 205

Nomenclature

Does anyone happen to have the graphic that Dr. Lavelle showed in class with the names of ligands used in coordination compounds? I would greatly appreciate it.
Thanks!
by Daniel_Callos_4I
Sat Oct 29, 2016 7:40 pm
Forum: Lewis Structures
Topic: Expanded Octets
Replies: 4
Views: 838

Re: Expanded Octets

Éléments with empty d orbitals can fill their d orbitals for the purposes of bonding, thus resulting in an expanded octet of 10 or even 12 electrons.
by Daniel_Callos_4I
Thu Oct 20, 2016 4:16 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge of 0 [ENDORSED]
Replies: 3
Views: 598

Formal Charge of 0 [ENDORSED]

Why is it favorable to have a formal charge of 0, and why do compounds with a lower overall formal charge contribute more to the resonance of a molecule?
by Daniel_Callos_4I
Fri Oct 14, 2016 4:30 pm
Forum: Significant Figures
Topic: Addition and subtraction of significant figures with scientific notation?
Replies: 4
Views: 762

Addition and subtraction of significant figures with scientific notation?

How does this work? For instance,

does 8.27*10^7 - 8.27*10^6 equal 7.44*10^7 or 7.4*10^7
it is about the number of decimal places, or the actual place value?

Thanks,
D. Callos
by Daniel_Callos_4I
Thu Oct 06, 2016 5:11 pm
Forum: *Shrodinger Equation
Topic: Wave function [ENDORSED]
Replies: 1
Views: 328

Wave function [ENDORSED]

What is a wavefunction and why is it used to model electrons?
by Daniel_Callos_4I
Fri Sep 30, 2016 2:39 pm
Forum: Properties of Electrons
Topic: Atomic Spectrum
Replies: 1
Views: 292

Re: Atomic Spectrum

The Rydberg equation is a mathematical extension of the Bohr Frequency Condition which allows us to calculate the frequency of photons emitted as photoexcited electrons fall back to their original energy level. In a former post, I gave an informal proof for the Rydberg equation based on the basic st...
by Daniel_Callos_4I
Fri Sep 30, 2016 2:33 pm
Forum: Properties of Light
Topic: Black Body Radiation
Replies: 2
Views: 440

Re: Black Body Radiation

I read on the topic and asked Dr. Lavelle during office hours, and I think this is how it goes. As mentioned above and in the course reader, black bodies are different from atoms and molecules in that atoms and molecules have characteristic absorption and emission spectra; however, black bodies can ...
by Daniel_Callos_4I
Fri Sep 30, 2016 11:49 am
Forum: Einstein Equation
Topic: What is the eV unit? [ENDORSED]
Replies: 6
Views: 2200

Re: What is the eV unit? [ENDORSED]

Hey,
The electron volt is the amount of work (force over a distance) necessary to move an electron across an electrical pressure difference of one volt.

Hope this helps and happy chemistry!

-Dan Callos
by Daniel_Callos_4I
Thu Sep 29, 2016 4:30 pm
Forum: Properties of Light
Topic: Different ways of looking at light
Replies: 3
Views: 374

Re: Different ways of looking at light

Yes, you are correct. Just remember that neither of these models give us perfect insight into the nature of light and it is hard to form a unified picture; after all, our intuition as humans was developed with macroscopic objects, not unobservable light.
by Daniel_Callos_4I
Wed Sep 28, 2016 11:20 pm
Forum: Empirical & Molecular Formulas
Topic: Order of writing ions in a molecule? [ENDORSED]
Replies: 3
Views: 504

Re: Order of writing ions in a molecule? [ENDORSED]

Convention states that for covalent compounds, C is written first, then H, then all remaining elements in alphabetical order. So for your case I believe CHO would be the correct order. Hope this helps and happy chemistry!

-D. Callos
by Daniel_Callos_4I
Wed Sep 28, 2016 10:53 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr Frequency Condition
Replies: 2
Views: 3140

Re: Bohr Frequency Condition

In order to understand the Bohr frequency condition both conceptually and mathematically, it is necessary to establish a working knowledge of the theory that preceded it. A researcher by the name of Ernest Rutherford had previously performed a gold foil experiment, showing that, when helium atoms we...
by Daniel_Callos_4I
Wed Sep 28, 2016 4:46 pm
Forum: General Science Questions
Topic: Memorizing Constants
Replies: 2
Views: 559

Re: Memorizing Constants

I can't give an official answer on this topic, but from what I've heard mentioned in class by Dr. Lavelle it seems as if these constants will be provided to us as needed for assessments.
by Daniel_Callos_4I
Mon Sep 26, 2016 4:25 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Balancing Chemistry Equations Pre-module Assessment Question #6
Replies: 2
Views: 486

Re: Balancing Chemistry Equations Pre-module Assessment Question #6

Generally there is a fairly formulaic way to go about balancing chemical equations for the combustion of hydrocarbons. First, let us examine the unbalanced equation: C4H10(g) + O2(g) ---> CO2(g) + H2O(g) Let us start with carbon, as there are 4 carbons on the left side but only one on the right. We ...

Go to advanced search