Search found 30 matches

by Jonghwee Park 1K
Thu Jun 14, 2018 2:18 pm
Forum: Amphoteric Compounds
Topic: 12.17 [ENDORSED]
Replies: 9
Views: 811

Re: 12.17 [ENDORSED]

How does the lewis structure prove that it can receive or give away lone pairs?
by Jonghwee Park 1K
Mon Jun 11, 2018 1:04 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Configurations including f-orbitals
Replies: 1
Views: 167

Configurations including f-orbitals

For the final, will we have to know the electron configurations of atoms who have the f-orbitals?
by Jonghwee Park 1K
Sun Jun 10, 2018 10:42 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs for Final
Replies: 8
Views: 344

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?
by Jonghwee Park 1K
Sun Jun 03, 2018 11:35 pm
Forum: Hybridization
Topic: Lone Pairs
Replies: 5
Views: 142

Re: Lone Pairs

Does that mean if the atom has 3 lone pairs and one bond, its hybridization would be sp^3?
by Jonghwee Park 1K
Sun Jun 03, 2018 10:45 pm
Forum: Hybridization
Topic: Sigma and Pi Bonds
Replies: 5
Views: 177

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?
by Jonghwee Park 1K
Sun Jun 03, 2018 9:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs
Replies: 7
Views: 185

Re: Lone pairs

Would the increasing number of lone pairs on one atom increasingly decrease the bond angles of the molecule?
by Jonghwee Park 1K
Sun May 27, 2018 9:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs on non-central atoms
Replies: 4
Views: 93

Lone pairs on non-central atoms

Do lone pairs on non-central atoms affect the bond length or bond angle?
by Jonghwee Park 1K
Sun May 27, 2018 8:53 pm
Forum: Ionic & Covalent Bonds
Topic: Difference between polar covalent and ionic bond?
Replies: 2
Views: 191

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?
by Jonghwee Park 1K
Sun May 27, 2018 7:52 pm
Forum: Lewis Structures
Topic: Lone pair arrangement
Replies: 4
Views: 165

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?
by Jonghwee Park 1K
Sun May 20, 2018 11:55 pm
Forum: Lewis Structures
Topic: How do I start a Lewis structure?
Replies: 3
Views: 127

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)
by Jonghwee Park 1K
Sun May 20, 2018 2:17 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic bonds
Replies: 6
Views: 196

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?
by Jonghwee Park 1K
Sun May 20, 2018 4:35 am
Forum: Lewis Structures
Topic: Cyclic Structure (S3N3)
Replies: 1
Views: 102

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.
by Jonghwee Park 1K
Sun May 13, 2018 10:33 pm
Forum: Lewis Structures
Topic: Max Number of bonds
Replies: 2
Views: 66

Max Number of bonds

Can a single element have 4 chemical bonds with another single element ?
by Jonghwee Park 1K
Sun May 13, 2018 8:55 pm
Forum: Lewis Structures
Topic: Meaning of chemical bond
Replies: 5
Views: 112

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 ?
by Jonghwee Park 1K
Sun May 13, 2018 5:22 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge purpose
Replies: 33
Views: 1194

Re: Formal charge purpose

I think it’s because of the formal charge adds up to 0, the Lewis structure is the most stable.
by Jonghwee Park 1K
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: 155

Energy difference between 4s and 3d

Why does 3p have more energy if 4s has a higher principal quantum number?
by Jonghwee Park 1K
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: 175

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?
by Jonghwee Park 1K
Sun May 06, 2018 4:10 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Configuration of Fe
Replies: 2
Views: 94

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!
by Jonghwee Park 1K
Sun Apr 29, 2018 11:49 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Probability Definition
Replies: 2
Views: 72

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?
by Jonghwee Park 1K
Sun Apr 29, 2018 11:46 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Defining Wavefunction
Replies: 1
Views: 60

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?
by Jonghwee Park 1K
Sun Apr 29, 2018 11:38 pm
Forum: *Particle in a Box
Topic: Particle in a box (textbook) [ENDORSED]
Replies: 4
Views: 406

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 ...
by Jonghwee Park 1K
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: 65

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.
by Jonghwee Park 1K
Sun Apr 22, 2018 11:35 pm
Forum: DeBroglie Equation
Topic: Wavelength= (h/p) [ENDORSED]
Replies: 7
Views: 335

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?
by Jonghwee Park 1K
Sun Apr 22, 2018 11:29 pm
Forum: *Black Body Radiation
Topic: Temperature relates to brightness?
Replies: 2
Views: 317

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?
by Jonghwee Park 1K
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: 46

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!
by Jonghwee Park 1K
Sun Apr 15, 2018 11:52 pm
Forum: Photoelectric Effect
Topic: "Discrete" units [ENDORSED]
Replies: 2
Views: 86

"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.
by Jonghwee Park 1K
Sun Apr 15, 2018 11:43 pm
Forum: Properties of Electrons
Topic: Millikan's oil-drop experiment
Replies: 1
Views: 80

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!
by Jonghwee Park 1K
Sun Apr 08, 2018 10:57 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Definition of moles [ENDORSED]
Replies: 5
Views: 219

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.
by Jonghwee Park 1K
Sun Apr 08, 2018 10:46 pm
Forum: Empirical & Molecular Formulas
Topic: Worksheet problem number seven [ENDORSED]
Replies: 1
Views: 89

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?
by Jonghwee Park 1K
Fri Apr 06, 2018 2:17 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Percent composition [ENDORSED]
Replies: 3
Views: 146

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?

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