CHEMISTRY COMMUNITY

Daniel Kim 1D

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.

Daniel Kim 1D

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.

Daniel Kim 1D

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?

Daniel Kim 1D

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.

Daniel Kim 1D

I was wondering if there was a list of acids or like a way to tell if one is a base.

Daniel Kim 1D

I was wondering if there was a list of acids or like a way to tell if one is an acid.

Daniel Kim 1D

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.

Daniel Kim 1D

Polarizing power is how well a cation can distort the electron density/cloud of a polarizable anion.

Daniel Kim 1D

Intermolecular forces consist of hydrogen, vander waal interactions, and dipole-dipole interactions. Intramolecular forces consist mainly of ionic and covalent bonds.

Daniel Kim 1D

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.

Daniel Kim 1D

Radicals are when an element has a single electron un paired. This happens when the number of electrons is an odd number.

Daniel Kim 1D

As is in the fourth period, therefore, 3d being a lower energy level it will be included in the electron configuration before 4s.

Daniel Kim 1D

Hi,
I was wondering how one would be able to tell if an electron configuration is at its ground or excited state.
Thanks!

Daniel Kim 1D

Yes they do, goes right across a period and up a group on the periodic table.

Daniel Kim 1D

Electronegativity is the energy needed to gain an electron while ionization energy is the energy needed to lose an electron.

Daniel Kim 1D

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!

Daniel Kim 1D

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.

Daniel Kim 1D

It is based on the electro negativity difference, the greater it is, the more ionic character is has.

Daniel Kim 1D

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.

Daniel Kim 1D

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?

Daniel Kim 1D

When the E (energy of the photon) equals the work function. Kinetic energy = energy of photon - work function

Daniel Kim 1D

Represents the energy of the photon meanwhile the work function is the amount of energy needed to remove it.

Daniel Kim 1D

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...

Daniel Kim 1D

Yes it does, and frequency is the amount of repeated of the wave. Which makes them indirectly proportionate.

Daniel Kim 1D

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.

Daniel Kim 1D

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!

Daniel Kim 1D

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...

Daniel Kim 1D

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...

Daniel Kim 1D

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

Daniel Kim 1D

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.

Daniel Kim 1D

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.

Daniel Kim 1D

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...

Daniel Kim 1D

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...

Daniel Kim 1D

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?

Daniel Kim 1D

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?

Daniel Kim 1D

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.

Daniel Kim 1D

Hmm... alright thanks guys

Daniel Kim 1D

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!

CHEMISTRY COMMUNITY

Search found 38 matches

Re: Geometry vs molecular shape

Re: Ionic Character

Acid Even After Octet Exception

Re: Lewis Acids and Bases

Help, confused at identifying

How to tell?

Re: Which do you prioritize first

Re: Polarizing Power [ENDORSED]

Re: Inter and Intra

Re: CX and CN bonds [ENDORSED]

Re: Radicals

Re: Notation of electron configurations of ions

Energy State

Re: Trend of Electronegativity

Re: Electronegativity vs ionization energy

Re: Ionic vs Covalent

Re: Ion-Dipole

Re: Ionic Character

Re: Ionic vs.covalent bonding

Work function

Re: kinetic energy of electron

Re: E=hv [ENDORSED]

Re: Electron Configuration

Re: wavelength

Re: Formulas

Re: Molar Mass vs. Atomic Weight

Re: Actual/Theoretical Yield

Re: G.5

Re: MOLARITY

Re: Balancing Equations [ENDORSED]

Re: Moles in compound

Determine Usage of Sig Figs During Problem

Midterm Solutions Fall 2018-2019 year

Representation of each Quantum Number

Test #2 Question #5b

Help with problem

Re: Modules

Modules