Search found 38 matches

by Daniel Kim 1D
Sun Jul 28, 2019 9:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Geometry vs molecular shape
Replies: 6
Views: 208

Re: Geometry vs molecular shape

When there are no lone pairs they are the same. When there is a lone pair, the geometry takes account of only the elctron densities and the molecuar shape takes account for the lone pairs.
by Daniel Kim 1D
Sun Jul 28, 2019 9:12 pm
Forum: Electronegativity
Topic: Ionic Character
Replies: 7
Views: 460

Re: Ionic Character

Because Cl is affected by shielding, O is actually higher in electronegativity. Also, oxygen is considered one of the most electronegative alongside, Nitrogen and Fluorine which is why H Bonding only happens between those three elements.
by Daniel Kim 1D
Sun Jul 28, 2019 9:09 pm
Forum: Octet Exceptions
Topic: Acid Even After Octet Exception
Replies: 1
Views: 157

Acid Even After Octet Exception

When thinking about Lewis acids, would it still be considered a Lewis Acid when it accepts an electron pair to fulfill one of the empty d-orbitals? For the elements on the third block or lower, when they accept an electron pair despite already having a full orbital is it still considered a Lewis Acid?
by Daniel Kim 1D
Sun Jul 28, 2019 9:08 pm
Forum: Octet Exceptions
Topic: Lewis Acids and Bases
Replies: 10
Views: 412

Re: Lewis Acids and Bases

Lewis acids accept an electron pair from lewis bases. When there is an empty orbital, most likely a lewis acid, it will accept an electron pair from a lewis base.
by Daniel Kim 1D
Sun Jul 28, 2019 9:07 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Help, confused at identifying
Replies: 1
Views: 170

Help, confused at identifying

I was wondering if there was a list of acids or like a way to tell if one is a base.
by Daniel Kim 1D
Sun Jul 28, 2019 9:06 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: How to tell?
Replies: 2
Views: 176

How to tell?

I was wondering if there was a list of acids or like a way to tell if one is an acid.
by Daniel Kim 1D
Sat Jul 20, 2019 5:41 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Which do you prioritize first
Replies: 10
Views: 370

Re: Which do you prioritize first

Valence electrons then formal charge so that you can have a rough guideline of how to order the electrons. Once you determine the formal charges, in relation to the overall charge, you can add changes.
by Daniel Kim 1D
Sat Jul 20, 2019 5:40 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing Power [ENDORSED]
Replies: 8
Views: 418

Re: Polarizing Power [ENDORSED]

Polarizing power is how well a cation can distort the electron density/cloud of a polarizable anion.
by Daniel Kim 1D
Sat Jul 20, 2019 5:38 pm
Forum: Ionic & Covalent Bonds
Topic: Inter and Intra
Replies: 8
Views: 362

Re: Inter and Intra

Intermolecular forces consist of hydrogen, vander waal interactions, and dipole-dipole interactions. Intramolecular forces consist mainly of ionic and covalent bonds.
by Daniel Kim 1D
Sat Jul 20, 2019 5:36 pm
Forum: Ionic & Covalent Bonds
Topic: CX and CN bonds [ENDORSED]
Replies: 2
Views: 339

Re: CX and CN bonds [ENDORSED]

CX bonds usually mean X is a certain element for a problem most likely. The length of a bond is shorter if the bond is stronger, such as if there are a larger number of bonds, single, double, and triple being the strongest.
by Daniel Kim 1D
Sat Jul 20, 2019 5:35 pm
Forum: Ionic & Covalent Bonds
Topic: Radicals
Replies: 7
Views: 380

Re: Radicals

Radicals are when an element has a single electron un paired. This happens when the number of electrons is an odd number.
by Daniel Kim 1D
Sat Jul 20, 2019 5:34 pm
Forum: Ionic & Covalent Bonds
Topic: Notation of electron configurations of ions
Replies: 5
Views: 283

Re: Notation of electron configurations of ions

As is in the fourth period, therefore, 3d being a lower energy level it will be included in the electron configuration before 4s.
by Daniel Kim 1D
Tue Jul 16, 2019 5:27 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Energy State
Replies: 2
Views: 226

Energy State

Hi,
I was wondering how one would be able to tell if an electron configuration is at its ground or excited state.
Thanks!
by Daniel Kim 1D
Sat Jul 13, 2019 3:06 pm
Forum: Electronegativity
Topic: Trend of Electronegativity
Replies: 18
Views: 605

Re: Trend of Electronegativity

Yes they do, goes right across a period and up a group on the periodic table.
by Daniel Kim 1D
Sat Jul 13, 2019 3:05 pm
Forum: Electronegativity
Topic: Electronegativity vs ionization energy
Replies: 7
Views: 269

Re: Electronegativity vs ionization energy

Electronegativity is the energy needed to gain an electron while ionization energy is the energy needed to lose an electron.
by Daniel Kim 1D
Sat Jul 13, 2019 3:04 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 2
Views: 236

Re: Ionic vs Covalent

The book helps attest for the first part, but honestly there is probably some leeway to the numbers because of each elements bond length and/or other factors but I think it’s safe to think 2 and 1.5, easier to memorize as well!
by Daniel Kim 1D
Sat Jul 13, 2019 3:03 pm
Forum: Ionic & Covalent Bonds
Topic: Ion-Dipole
Replies: 3
Views: 385

Re: Ion-Dipole

Dipoles usually result from a great charge difference between the two ions. One would be partially negative and the other positive, one of the examples from the top of my head would be water I think. You can read more about it in the textbook, for me in the 6th edition it was around page 92.
by Daniel Kim 1D
Sat Jul 13, 2019 3:01 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Character
Replies: 4
Views: 164

Re: Ionic Character

It is based on the electro negativity difference, the greater it is, the more ionic character is has.
by Daniel Kim 1D
Sat Jul 13, 2019 3:00 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs.covalent bonding
Replies: 4
Views: 167

Re: Ionic vs.covalent bonding

There are multiple ways to tell if it is covalent or ionic bonding. For ionic bonding, the electro negativity difference is greater than 2, for covalent, the difference is less that 1.5. There is some leeway in between the two values whether you factor in experimental values or proved in another way.
by Daniel Kim 1D
Sat Jul 06, 2019 6:18 pm
Forum: Photoelectric Effect
Topic: Work function
Replies: 1
Views: 215

Work function

If given a problem to find the kinetic energy, will we be given the work function and energy of a photon (direct or indirectly)? In regards to the work function, do we have memorize some for certain metals or will they be mostly given in the problems that we will have to solve?
by Daniel Kim 1D
Sat Jul 06, 2019 6:16 pm
Forum: Photoelectric Effect
Topic: kinetic energy of electron
Replies: 8
Views: 358

Re: kinetic energy of electron

When the E (energy of the photon) equals the work function. Kinetic energy = energy of photon - work function
by Daniel Kim 1D
Sat Jul 06, 2019 6:15 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 41
Views: 1403

Re: E=hv

Represents the energy of the photon meanwhile the work function is the amount of energy needed to remove it.
by Daniel Kim 1D
Sat Jul 06, 2019 6:13 pm
Forum: Properties of Electrons
Topic: Electron Configuration
Replies: 9
Views: 363

Re: Electron Configuration

This might be one of the elements such as Cu and Cr that has been proven by experimental methods. Rather than trying to solve it out, probably one of the ones that should be memorized. However, professor Lavelle said we should only memorize Cu and Cr so we shouldn’t be too worried about that I’m pre...
by Daniel Kim 1D
Sat Jul 06, 2019 6:11 pm
Forum: Properties of Light
Topic: wavelength
Replies: 11
Views: 648

Re: wavelength

Yes it does, and frequency is the amount of repeated of the wave. Which makes them indirectly proportionate.
by Daniel Kim 1D
Sat Jul 06, 2019 6:08 pm
Forum: Empirical & Molecular Formulas
Topic: Formulas
Replies: 10
Views: 699

Re: Formulas

You first divide by the smallest mole then multiply the number that will make the empirical formula into all whole numbers. After that, you use the grams/mol that is given and divide the molar mass by that to see what is the factor that your moles have to be multiplied by.
by Daniel Kim 1D
Sat Jul 06, 2019 6:05 pm
Forum: Empirical & Molecular Formulas
Topic: Molar Mass vs. Atomic Weight
Replies: 7
Views: 413

Re: Molar Mass vs. Atomic Weight

They are pretty much the same thing. Molar mass is to find the mass for one mole. Atomic weight is the mass in grams, I’m pretty sure!
by Daniel Kim 1D
Wed Jun 26, 2019 7:35 pm
Forum: Molarity, Solutions, Dilutions
Topic: Actual/Theoretical Yield
Replies: 8
Views: 1051

Re: Actual/Theoretical Yield

I doubt there is any question that asks to find a reason because like professor Lavelle said in class, the theoretical yield is the maximum and the actual yield will be less because of human error and the difficulty in precisely and accurately obtaining the correct yield, whether it be some solution...
by Daniel Kim 1D
Wed Jun 26, 2019 7:33 pm
Forum: Molarity, Solutions, Dilutions
Topic: G.5
Replies: 3
Views: 263

Re: G.5

When I saw this problem for the first time, I thought i had to use M1V1 = M2V2, however looking closer at the problem you don’t need it. First you want to find the molarity of Na2CO3 which is .08 M Na2CO3. Then you change the moms of Na to mol. You want to find the volume (in liters) so using dimens...
by Daniel Kim 1D
Wed Jun 26, 2019 7:29 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: MOLARITY
Replies: 17
Views: 624

Re: MOLARITY

Most of the time in chemistry, you will be using moles to compare two elements, compounds, or solutions. Considering this, the M1V1 = M2V2 comes from. Molarity = moles/volume so you are comparing the moles in the form of Molarity1*Volume1 = Molarity2*Volume2
by Daniel Kim 1D
Wed Jun 26, 2019 7:26 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Balancing Equations [ENDORSED]
Replies: 25
Views: 371

Re: Balancing Equations [ENDORSED]

I remember him saying that the ratios still make sense despite it not being a whole number. However for the sake of nature, I suppose, it is important to keep it at the lowest whole number to get your empirical/ molecular formula to get points on it on an exam.
by Daniel Kim 1D
Wed Jun 26, 2019 7:25 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Moles in compound
Replies: 2
Views: 193

Re: Moles in compound

Given the molecular formula, you would find the molar mass, the sum of all the atomic masses. You would then divide the weight that you are given by the molar mass to find out how many moles of that certain compound you have.
by Daniel Kim 1D
Wed Jun 26, 2019 7:22 pm
Forum: Significant Figures
Topic: Determine Usage of Sig Figs During Problem
Replies: 2
Views: 220

Determine Usage of Sig Figs During Problem

If the determined sig fig for the answer for a question is 3. Throughout the question would I used 3 sig figs for all values. For example, on the periodic table the atomic mass of oxygen is 15.999, but if the determined sig figs for the answer is 3 would I only use 15.9 or can I use 15.999 and round...
by Daniel Kim 1D
Sat Dec 08, 2018 1:25 pm
Forum: Empirical & Molecular Formulas
Topic: Midterm Solutions Fall 2018-2019 year
Replies: 2
Views: 272

Midterm Solutions Fall 2018-2019 year

For question #2, the solution manual utilizes 2.0158 g for H when that is actually the weight in grams for two Hydrogen atoms. In order to solve this problem, which one will I have to use? 1.007 g H or 2.0158 g H2? I can follow along the other steps but I can’t seem to understand how to find the mol...
by Daniel Kim 1D
Sat Dec 08, 2018 11:32 am
Forum: Quantum Numbers and The H-Atom
Topic: Representation of each Quantum Number
Replies: 2
Views: 217

Representation of each Quantum Number

Can someone clarify to me what each Quantum Number represents in relation to which orbital an electron will be in, how many electrons can a given atom contain, and the shape of the electron orbital?
by Daniel Kim 1D
Sat Dec 08, 2018 11:19 am
Forum: Quantum Numbers and The H-Atom
Topic: Test #2 Question #5b
Replies: 2
Views: 188

Test #2 Question #5b

The question is what is the probability of finding an electron in the exact center of this orbital?
The answer is 0% but I can’t figure out why. Can someone explain this to me?
by Daniel Kim 1D
Sat Dec 08, 2018 10:27 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Help with problem
Replies: 1
Views: 234

Help with problem

Hello I was looking if someone could clarify how to solve problem #1 on Test #2. It is about finding the uncertainty in velocity of the carbon monoxide molecule within the sac. When the sac has a diameter of 2*10^-4m.
by Daniel Kim 1D
Fri Dec 07, 2018 10:24 am
Forum: Administrative Questions and Class Announcements
Topic: Modules
Replies: 3
Views: 118

Re: Modules

Hmm... alright thanks guys
by Daniel Kim 1D
Wed Dec 05, 2018 3:52 pm
Forum: Administrative Questions and Class Announcements
Topic: Modules
Replies: 3
Views: 118

Modules

Hi everyone, so I noticed that the modules helped me a lot with the first test and I was just wondering if there are any similar videos to them online somewhere! It would be great to go over them for finals. Thanks!

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