Search found 60 matches
- Sat Dec 08, 2018 6:10 pm
- Forum: Hybridization
- Topic: Power
- Replies: 1
- Views: 401
Power
Do we need to include the power in front of the hybridization? *C2sp2?
- Sat Dec 08, 2018 6:09 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent
- Replies: 1
- Views: 242
Bent
For the final, will we need to specify which bent shape we are referring to when answering? Would including the angle be enough?
- Sat Dec 08, 2018 6:04 pm
- Forum: Electronegativity
- Topic: Exceptions
- Replies: 3
- Views: 696
Exceptions
What are the electronegativity trend exceptions? What is the general trend?
- Fri Nov 30, 2018 3:29 pm
- Forum: Electronegativity
- Topic: Exceptions
- Replies: 7
- Views: 1047
Exceptions
What are the exceptions in regards to the electronegativity pattern regarding the periodic table? Will we need to know these exceptions for the final?
- Fri Nov 30, 2018 3:22 pm
- Forum: Dipole Moments
- Topic: Molecular Geometry and polarity
- Replies: 5
- Views: 419
Re: Molecular Geometry and polarity
Depending on the electronegativity of the atoms or molecules, it should be a good indicator that it is nonpolar.
- Fri Nov 30, 2018 3:09 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Sigma and Pi Bonds
- Replies: 12
- Views: 1025
Sigma and Pi Bonds
Does a triple bond have 1 sigma bond and two pi bonds? Or is it 2 sigma bonds or something totally different?
- Mon Nov 19, 2018 4:15 pm
- Forum: Hybridization
- Topic: Class 11/19/2018
- Replies: 1
- Views: 169
Class 11/19/2018
In class today he said "number of unpaired electrons tells you how many...." can somebody finish this for me? I couldn't get if he said bonds or something else. Thank you
- Mon Nov 19, 2018 4:14 pm
- Forum: Hybridization
- Topic: Labeling Compounds
- Replies: 4
- Views: 324
Labeling Compounds
In class today he labeled methane (CH4) as C2sp^3 H1s. Why is it not 2sp^4 if there are four regions of electron density?
- Mon Nov 19, 2018 3:57 pm
- Forum: Hybridization
- Topic: What hybridization tells us
- Replies: 2
- Views: 243
What hybridization tells us
In class today, Dr. Lavelle said that hybridization does not tell us molecular shape/structure, but can it tell us bond angles?
- Fri Nov 16, 2018 5:01 pm
- Forum: Hybridization
- Topic: Energy Level
- Replies: 2
- Views: 318
Energy Level
Because we only write it out as SP2 instead of 2SP2, does that mean energy levels has no relation with hybridization? Would energy levels be needed if we were to go beyond 3 bonds?
- Fri Nov 16, 2018 4:45 pm
- Forum: Hybridization
- Topic: Sigma and Pi
- Replies: 5
- Views: 419
Sigma and Pi
Why is the first bond always going to be Sigma? and the second and third Pi? can there be more than 3?
- Fri Nov 16, 2018 4:17 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Planar vs Pyramidal
- Replies: 5
- Views: 534
Planar vs Pyramidal
Is there a difference between trigonal planar and trigonal pyramidal compounds? Is there a difference in their bond angles?
- Fri Nov 09, 2018 5:57 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 8
- Views: 699
Electronegativity
What does it mean if an element is more electronegative than another?
- Fri Nov 09, 2018 5:56 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Octet Exceptions
- Replies: 4
- Views: 1095
Octet Exceptions
With elements with exceptions in their classification like Copper and Chromium, does that change the number of valence electrons they produce?
- Fri Nov 09, 2018 5:55 pm
- Forum: Dipole Moments
- Topic: Dipole
- Replies: 8
- Views: 746
Dipole
In terms of drawing Lewis Structures, how does dipole moments effects the structure of an atom?
- Fri Nov 02, 2018 3:56 pm
- Forum: Resonance Structures
- Topic: Polar
- Replies: 8
- Views: 932
Polar
How do you know which resonance structure to use if they are polar? Is it always by lowest charge?
- Fri Nov 02, 2018 3:53 pm
- Forum: Octet Exceptions
- Topic: Boron and Aluminum
- Replies: 2
- Views: 332
Boron and Aluminum
Why are these two given exceptions for the Octet rule? Is it only these two?
- Fri Nov 02, 2018 3:52 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 11
- Views: 1223
Formal Charge
Can we determine an element/compound by formal charge alone?
- Sat Oct 27, 2018 12:13 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum Numbers
- Replies: 5
- Views: 502
Quantum Numbers
How do you know if the charge is positive 1/2 or negative 1/2?
- Sat Oct 27, 2018 12:13 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: s,p,d,f
- Replies: 8
- Views: 914
s,p,d,f
Why does the number order change going from S to D? 4s to 3d instead of 4d?
- Sat Oct 27, 2018 12:11 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Orbitals
- Replies: 4
- Views: 413
Orbitals
What's the difference between the outer most orbital and shell? Is the shell now the outer most orbital?
- Thu Oct 18, 2018 5:10 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbitals
- Replies: 2
- Views: 270
Orbitals
Can someone explain to me how orbitals work? Why it starts with s but skips p and d for f? I am lost with this. Thanks!
- Thu Oct 18, 2018 5:02 pm
- Forum: *Black Body Radiation
- Topic: Black Body Radiation
- Replies: 2
- Views: 661
Black Body Radiation
To what extent are Black Bodies relevant in our everyday lives? Is this something that can only occur through manipulation or naturally?
- Thu Oct 18, 2018 4:59 pm
- Forum: Properties of Light
- Topic: Speed of Light
- Replies: 5
- Views: 592
Speed of Light
In terms of given variables (e.g. speed of light), how many significant figures is recommended to answer a problem?
- Fri Oct 12, 2018 2:33 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect Initial Purpose
- Replies: 4
- Views: 407
Photoelectric Effect Initial Purpose
The photoelectric effect was an "accidental finding", what was the original purpose of the study? Did they ever follow up on that purpose?
- Fri Oct 12, 2018 2:30 pm
- Forum: Properties of Light
- Topic: Quantum World Topics
- Replies: 3
- Views: 143
Re: Quantum World Topics
I personally refer to Khan Academy when I struggle with chemistry related topics. And crash course is always available on YouTube if you haven't checked.
- Fri Oct 12, 2018 2:24 pm
- Forum: Photoelectric Effect
- Topic: Work function
- Replies: 3
- Views: 214
Re: Work function
I personally have never heard of the term workforce in chemistry so I looked it up myself and didn't really find anything relating to chemistry. I would assume it is just the same as work function. But if anybody else knows otherwise that would be great too.
- Sun Oct 07, 2018 9:59 am
- Forum: Molarity, Solutions, Dilutions
- Topic: Dilutions Problems
- Replies: 3
- Views: 226
Dilutions Problems
I've been struggling to figure out if a question is asking for a dilutions solutions or convergence solution. I know you need 3 givens to answer a dilutions but some questions have you figure out the third solution. What should I be looking for to know whether if the question is asking for a dilutio...
- Sun Oct 07, 2018 9:56 am
- Forum: Significant Figures
- Topic: Chemical Structure
- Replies: 2
- Views: 168
Re: Chemical Structure
I don't recall us going over chemical structures too in depth in class, or if we even did that in class yet. I wouldn't focus on that but instead focus on the lecture and stuff from our readings. Hope that this helps!
- Sun Oct 07, 2018 9:54 am
- Forum: SI Units, Unit Conversions
- Topic: Accommodation on Section Tests
- Replies: 1
- Views: 173
Re: Accommodation on Section Tests
Hi I am not a student that has accommodation on section tests but I would highly recommend reaching out to Dr. Lavelle and your TA in person as well as shooting an email if you haven't done so. Goodluck!
- Sun Jun 10, 2018 11:50 pm
- Forum: Conjugate Acids & Bases
- Topic: Acids and Bases
- Replies: 2
- Views: 402
Acids and Bases
Can you split weak acids or bases? If so how? If not, why not?
- Sun Jun 10, 2018 11:49 pm
- Forum: Air Pollution & Acid Rain
- Topic: Acid Rain
- Replies: 3
- Views: 902
Acid Rain
How does ph levels of acid rain differ around the globe?
- Sun Jun 10, 2018 11:48 pm
- Forum: Conjugate Acids & Bases
- Topic: Acid and Bases [ENDORSED]
- Replies: 2
- Views: 549
Acid and Bases [ENDORSED]
Can acids and bases neutralize each other, and if so how? Is it just by mixing solutions?
- Sun Jun 03, 2018 11:48 pm
- Forum: Polyprotic Acids & Bases
- Topic: Acid and base Strength [ENDORSED]
- Replies: 2
- Views: 820
Acid and base Strength [ENDORSED]
What do the strength of acids and base tell us and what is the relationship of acidity to a molecular structure?
- Sun Jun 03, 2018 11:32 pm
- Forum: Lewis Acids & Bases
- Topic: Acids/Bases and Lewis Acids/Bases
- Replies: 2
- Views: 345
Acids/Bases and Lewis Acids/Bases
Why is an acid and base about the donor and acceptor of protons whereas Lewis acids and base is about the donor and acceptor of electron pairs?
- Sun Jun 03, 2018 11:21 pm
- Forum: Naming
- Topic: Coordination Compounds
- Replies: 3
- Views: 560
Coordination Compounds
I'm trying to know what the significance of these are, so what do a coordination sphere, number, and compound tell us?
- Sat May 26, 2018 6:49 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Valence Bond Theory
- Replies: 2
- Views: 625
Valence Bond Theory
Can someone explain to me the valence bond theory? or link me to a video that better explains it? I couldn't understand it from what the author said about it in the text.
- Sat May 26, 2018 6:46 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecule Shape
- Replies: 1
- Views: 216
Molecule Shape
Is it possible to determine a molecule's shape using VSPER with a radical molecule?
- Sat May 26, 2018 6:39 pm
- Forum: Hybridization
- Topic: Hybrid Orbitals
- Replies: 4
- Views: 531
Hybrid Orbitals
What is the difference between hybrid orbitals and regular (nonhybrid) orbitals?
- Sun May 20, 2018 11:49 pm
- Forum: Octet Exceptions
- Topic: Radical
- Replies: 1
- Views: 269
Radical
Are radical chemical bonds possible without an extra electron to make the number of electrons even? Do they exist without manipulation?
- Sun May 20, 2018 11:47 pm
- Forum: Lewis Structures
- Topic: Lewis Structure
- Replies: 2
- Views: 341
Lewis Structure
A chemical bond with 4 or more elements, do they always bond with one specific atom (one directly in the middle) or can they be two pairs of elements sharing a bond? (kind of difficult to word)
- Sun May 20, 2018 11:41 pm
- Forum: Octet Exceptions
- Topic: Octet Exception
- Replies: 7
- Views: 1087
Octet Exception
How do you know if a bond will have an octet exception or not? Is it only by memorization or position of an element on the periodic table?
- Sun May 13, 2018 6:28 pm
- Forum: Octet Exceptions
- Topic: Concept of Exceptions
- Replies: 4
- Views: 679
Concept of Exceptions
Why is it that elements in the third row and below have octect exceptions instead of elements earlier in the periodic table?
- Sun May 13, 2018 6:14 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs Covalent vs Metallic Bonds
- Replies: 6
- Views: 1315
Ionic vs Covalent vs Metallic Bonds
What is the easiest way to distinguish the three different kinds of bonds?
- Sun May 13, 2018 6:10 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Bonds
- Replies: 3
- Views: 420
Covalent Bonds
How do you know if a bond is sharing electrons or not?
- Thu May 03, 2018 5:42 pm
- Forum: Trends in The Periodic Table
- Topic: Electron affinity
- Replies: 4
- Views: 484
Electron affinity
The textbook says that electron affinity increases towards the right of the periodic table. Why is that? Also is there a pattern or affinity going down the groups of the periodic table?
- Thu May 03, 2018 5:38 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Bohr radius [ENDORSED]
- Replies: 3
- Views: 516
Bohr radius [ENDORSED]
The textbook says that a(sub 0) is called the Bohr radius. Is this number a constant and what is its value? If not how do you find it?
- Wed May 02, 2018 2:31 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy
- Replies: 4
- Views: 554
Ionization Energy
In lecture today he said that lower ionization energy levels are cations. What is considered a low ionization energy? is it by value or position of the periodic table?
- Sun Apr 29, 2018 11:04 pm
- Forum: *Particle in a Box
- Topic: Equation meaning
- Replies: 1
- Views: 616
Equation meaning
In the caption of the "Particle in a Box" the equation is showed as (n^2*h^2)/(8mL^2). What does that mean and what does the other equation in the textbook (2n+1)(h^2)/8mL^2 mean?
- Sun Apr 29, 2018 10:52 pm
- Forum: *Shrodinger Equation
- Topic: Schrodinger equation definition?
- Replies: 3
- Views: 506
Re: Schrodinger equation definition?
The purpose of this equation is to find both the wavefunction (phi) and the corresponding energy (E). This equation helps us calculate the wavefunction for any particle. The textbook also mentions that this equation is a differential equation, the second derivative of phi, because it relates the der...
- Fri Apr 27, 2018 4:36 pm
- Forum: Properties of Light
- Topic: Energy difference in excited electrons
- Replies: 3
- Views: 352
Re: Energy difference in excited electrons
I am not 100% sure but from the success that I had with these kinds of problems when the values of n aren't given, it would depend on what is given. Assuming that everything but n is given, you would simplify it to 1/n(1)^2 - 1/n(2)^2 = Given info (after simplifying). From here you kind of have to g...
- Sun Apr 22, 2018 10:26 pm
- Forum: *Black Body Radiation
- Topic: Black Body Radiation
- Replies: 1
- Views: 471
Black Body Radiation
How do you know if a black body is emitting or absorbing a particular wavelength? And is black body radiation only the process of emitting different radiation wavelengths?
- Sun Apr 22, 2018 10:22 pm
- Forum: *Black Body Radiation
- Topic: What is a black body? [ENDORSED]
- Replies: 7
- Views: 1461
Re: What is a black body? [ENDORSED]
The textbook explains black body as the "hot object" and basically means that it is an object that is extremely hot (so hot it glows white) because it doesn't favor one wavelength over another, in the sense of choosing a wavelength to absorb or emit.
- Mon Apr 16, 2018 2:35 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg Constant
- Replies: 2
- Views: 220
Rydberg Constant
What is the significance of this value and is this only applied to H-atoms?
- Sun Apr 15, 2018 10:02 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect
- Replies: 1
- Views: 134
Photoelectric Effect
In the photoelectric effect slides learned in class, it talks about the concept of a radiation source emitting electrons off a source of metal. Does the kind of metal have any effect on this at all? Or does metal have a consistent value in this relationship between radiation, metal, and emitting ele...
- Sun Apr 15, 2018 9:51 pm
- Forum: Photoelectric Effect
- Topic: Radiation and heat
- Replies: 1
- Views: 118
Radiation and heat
I know that infrared radiation is radiation experienced as heat but do other radiation like visible light have a similar effect by heat?
- Sun Apr 15, 2018 9:46 pm
- Forum: Photoelectric Effect
- Topic: When to use Planck's Constant [ENDORSED]
- Replies: 5
- Views: 629
When to use Planck's Constant [ENDORSED]
I know that Planck's Constant is 6.626 x 10^-34 J S but what's the significance of it and when do you use it?
- Sun Apr 08, 2018 11:02 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Definition of Avogadro's number
- Replies: 3
- Views: 699
Definition of Avogadro's number
I am still confused on the idea of how Avogadro's number is consistent with every element. It doesn't make sense to me how an element as light as Hydrogen has the same number as a metal like Silver. Also I am unsure as to why Avogadro's number is a constant in chemistry with all of the other element...
- Sun Apr 08, 2018 10:58 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: The effect boiling a substance on its chemistry
- Replies: 1
- Views: 102
The effect boiling a substance on its chemistry
I understand the law of conservation of mass how matter is neither created nor destroyed. But If you were to dissolve a solution in a substance and boil the substance, would that effect the weight of the substance? Or would it depend on the chemistry of the substance?
- Sun Apr 08, 2018 10:51 pm
- Forum: SI Units, Unit Conversions
- Topic: Moles mols mol? [ENDORSED]
- Replies: 21
- Views: 9035
Moles mols mol? [ENDORSED]
I've seen different forms of the word moles used in the text, homework, and lecture slides and confused as to which term to use when, if it matters. Does it matter which spelling of the word I use (other than adding the "s" for plural).