Search found 30 matches
- Thu Jun 14, 2018 2:18 pm
- Forum: Amphoteric Compounds
- Topic: 12.17 [ENDORSED]
- Replies: 9
- Views: 1699
Re: 12.17 [ENDORSED]
How does the lewis structure prove that it can receive or give away lone pairs?
- Mon Jun 11, 2018 1:04 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Configurations including f-orbitals
- Replies: 1
- Views: 349
Configurations including f-orbitals
For the final, will we have to know the electron configurations of atoms who have the f-orbitals?
- Sun Jun 10, 2018 10:42 pm
- Forum: SI Units, Unit Conversions
- Topic: Sig Figs for Final
- Replies: 8
- Views: 1165
Sig Figs for Final
For the final, will we have to be exact with our significant figures or does it not matter like it didn't when we took our first test?
- Sun Jun 03, 2018 11:35 pm
- Forum: Hybridization
- Topic: Lone Pairs
- Replies: 5
- Views: 581
Re: Lone Pairs
Does that mean if the atom has 3 lone pairs and one bond, its hybridization would be sp^3?
- Sun Jun 03, 2018 10:45 pm
- Forum: Hybridization
- Topic: Sigma and Pi Bonds
- Replies: 5
- Views: 538
Re: Sigma and Pi Bonds
Why are sigma and pi bonds distinguished? More specifically, what makes something a sigma bond and what makes something a pi bond?
- Sun Jun 03, 2018 9:36 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone pairs
- Replies: 7
- Views: 773
Re: Lone pairs
Would the increasing number of lone pairs on one atom increasingly decrease the bond angles of the molecule?
- Sun May 27, 2018 9:17 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone pairs on non-central atoms
- Replies: 4
- Views: 779
Lone pairs on non-central atoms
Do lone pairs on non-central atoms affect the bond length or bond angle?
- Sun May 27, 2018 8:53 pm
- Forum: Ionic & Covalent Bonds
- Topic: Difference between polar covalent and ionic bond?
- Replies: 2
- Views: 4682
Difference between polar covalent and ionic bond?
What distinguishes a polar covalent and ionic bond? How do we know if there is a big enough difference in electronegativity for the bond to be ionic?
- Sun May 27, 2018 7:52 pm
- Forum: Lewis Structures
- Topic: Lone pair arrangement
- Replies: 4
- Views: 601
Lone pair arrangement
For the final, do we have to arrange the lone pairs so that they are the farthest away from a lone pair on another atom or can we place it anywhere along the atom?
- Sun May 20, 2018 11:55 pm
- Forum: Lewis Structures
- Topic: How do I start a Lewis structure?
- Replies: 3
- Views: 617
How do I start a Lewis structure?
When I first start to draw a lewis structure, what should I first do to start the structure? I often get confused what element should be in the middle. Is there a way to know which is in the middle and what structure it will be? (for example, cyclic)
- Sun May 20, 2018 2:17 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic bonds
- Replies: 6
- Views: 852
Re: Ionic bonds
I'm still confused on how to draw a lewis structure of an ionic bond. Do we not just draw a line like Na - Cl?
- Sun May 20, 2018 4:35 am
- Forum: Lewis Structures
- Topic: Cyclic Structure (S3N3)
- Replies: 1
- Views: 446
Cyclic Structure (S3N3)
During discussion, we went over the cyclic structure of [S3N3]. On the question, it said that the structure would be cyclic. On the test, will it tell us when the structure will be cyclic? I often get confused when to use this cyclic structure, so I was just wondering.
- Sun May 13, 2018 10:33 pm
- Forum: Lewis Structures
- Topic: Max Number of bonds
- Replies: 2
- Views: 280
Max Number of bonds
Can a single element have 4 chemical bonds with another single element ?
- Sun May 13, 2018 8:55 pm
- Forum: Lewis Structures
- Topic: Meaning of chemical bond
- Replies: 5
- Views: 610
Meaning of chemical bond
When we draw a line representing a chemical line does it mean that the elements are sharing electrons or does one element take both electrons ?
- Sun May 13, 2018 5:22 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge purpose
- Replies: 40
- Views: 6978
Re: Formal charge purpose
I think it’s because of the formal charge adds up to 0, the Lewis structure is the most stable.
- Sun May 06, 2018 10:56 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Energy difference between 4s and 3d
- Replies: 3
- Views: 1273
Energy difference between 4s and 3d
Why does 3p have more energy if 4s has a higher principal quantum number?
- Sun May 06, 2018 10:22 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Difference between the quantum number for particle and electron
- Replies: 3
- Views: 488
Difference between the quantum number for particle and electron
What is the difference between the principal quantum number for a particle and the principal quantum number for an electron?
- Sun May 06, 2018 4:10 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Configuration of Fe
- Replies: 2
- Views: 438
Configuration of Fe
For iron (Fe), is the electron configuration 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^6, 4s^2. We touched on it during discussion, but I forgot what and more importantly how we should write these configurations once the d-orbital gets involved. Thanks!
- Sun Apr 29, 2018 11:49 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Probability Definition
- Replies: 2
- Views: 270
Probability Definition
In the textbook, it states that probability "is unitless and lies between 0 (certainly not there) and 1 (certainly there)." Why can't it be in the middle of 0 and 1?
- Sun Apr 29, 2018 11:46 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Defining Wavefunction
- Replies: 1
- Views: 250
Defining Wavefunction
I asked a similar question last week, but I am still confused what a wavefunction actually is. Is the graph of a wavefunction, the actual trajectory a particle takes or is it a graph with values that determine the probability of where a particle is?
- Sun Apr 29, 2018 11:38 pm
- Forum: *Particle in a Box
- Topic: Particle in a box (textbook) [ENDORSED]
- Replies: 4
- Views: 1335
Particle in a box (textbook) [ENDORSED]
The textbook explains the "particle in a box" concept and says "the idea to keep in mind is that only certain wavelengths can exist in the box." Can someone explain this further? Why is it called a "particle in a box" and how does it prove that only certain wavelengths ...
- Sun Apr 22, 2018 11:48 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Difference between wave function and probability density
- Replies: 1
- Views: 1127
Difference between wave function and probability density
Can someone tell me the difference between wave function and probability density? I read the textbook definitions, but I can't totally grasp the difference and understand why the probability density is important.
- Sun Apr 22, 2018 11:35 pm
- Forum: DeBroglie Equation
- Topic: Wavelength= (h/p) [ENDORSED]
- Replies: 7
- Views: 1160
Wavelength= (h/p) [ENDORSED]
Hello. In lecture, professor Lavelle said the equation Wavelength= (h/p) applies to everything but light. I was wondering why? Is it because light doesn't have mass? And if so, do photons not have mass?
- Sun Apr 22, 2018 11:29 pm
- Forum: *Black Body Radiation
- Topic: Temperature relates to brightness?
- Replies: 2
- Views: 766
Temperature relates to brightness?
For black-body radiation, the textbook says that increasing temperature will increase the maximum intensity of radiation. In our worksheet in class, it talks about brightness and intensity. I was wondering if temperature, brightness, and intensity were all the same terms?
- Sun Apr 15, 2018 11:59 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: What is a unique electronic structure?
- Replies: 1
- Views: 124
What is a unique electronic structure?
When Professor Lavelle said that "atoms and molecules only absorb or emit unique frequencies that are allowed by their unique electronic structure," what does this mean? Can someone explain what kind of structure it is talking about? I think this has to do with the Einstein equation. Thanks!
- Sun Apr 15, 2018 11:52 pm
- Forum: Photoelectric Effect
- Topic: "Discrete" units [ENDORSED]
- Replies: 2
- Views: 1356
"Discrete" units [ENDORSED]
In lecture, Professor talked about how light is absorbed/emitted in discrete units. What does "discrete" mean? Sorry, this might seem like a dumb question, but I am confused.
- Sun Apr 15, 2018 11:43 pm
- Forum: Properties of Electrons
- Topic: Millikan's oil-drop experiment
- Replies: 1
- Views: 245
Millikan's oil-drop experiment
Can someone explain Millikan's oil-drop experiment? I don't understand the correlation between the electric field and gravity and how he found the charge of an electron through this. Thank you!
- Sun Apr 08, 2018 10:57 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Definition of moles [ENDORSED]
- Replies: 5
- Views: 665
Definition of moles [ENDORSED]
I don't understand how a mole means the number of atoms in something and also always means 6.022 x 10^23 of 'things' at the same time?
Also, why is a mol of carbon different than a mol of hydrogen? Basically, I'm having trouble finding a concrete definition for moles and what it actually means.
Also, why is a mol of carbon different than a mol of hydrogen? Basically, I'm having trouble finding a concrete definition for moles and what it actually means.
- Sun Apr 08, 2018 10:46 pm
- Forum: Empirical & Molecular Formulas
- Topic: Worksheet problem number seven [ENDORSED]
- Replies: 1
- Views: 177
Worksheet problem number seven [ENDORSED]
For number seven on the worksheet given to us in our discussion, why do we need to convert grams to moles in order to find the empirical formula of polyethylene? Why is it wrong to just compare/divide the grams to find the formula?
- Fri Apr 06, 2018 2:17 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Percent composition [ENDORSED]
- Replies: 3
- Views: 390
Percent composition [ENDORSED]
I was doing some problems and I wanted some clarification. When do you calculate the percent composition to find the empirical formula?