CHEMISTRY COMMUNITY

Andreana Vetus 1A

Kassidy Tran 1F wrote:How can you tell which compound will have a higher boiling point? For example, between the two molecules H2S and H2Se?

Furthermore, how can you tell which will have a higher boiling point based off of the intermolecular forces?

Andreana Vetus 1A

polar binds are observed when there is a dipole moment within a molecule. You can determine dipole moments by comparing the levels of electronegativity of the atoms. The atoms with higher electronegativity will have a stronger pull of electrons, thus causing a dipole moment.

Andreana Vetus 1A

First, look at the steric number of the lewis structure, which is 4 (there are 4 regions of electron density). Then look at the surrounding atoms to the central atom. The subscript following the X in the VSEPR formula indicates that there are 3 surrounding atoms. Lastly, look at the number of lone p...

Andreana Vetus 1A

Thw drawing of the ligands shows where exactly it is bonding to the central atom of the molecule. Hydrogen would not bond to the central Nitrogen atom, thus the arrangement reads H3N, where N connects to N.

Andreana Vetus 1A

Although there are line pros present in the regions of electron density, the angles will still be at 90°. This is because the positions of the lone pairs are on opposite sides to keep the molecule balanced, thus the lone pairs cancel out.

Andreana Vetus 1A

Yes. Every bonding region has one sigma bond. All additional bonds are pi bonds.

Andreana Vetus 1A

Can someone explain what Hydrogen Bonding is? What is the difference from covalent bonds?

Andreana Vetus 1A

With the shapes, do we need to memorize the bond angles? Exact angles in the presence of lone pairs would be determined experimentally, so you may not need to know those. But you do need to memorize the set angles, and when they become "slightly less" and "extremely less" than o...

Andreana Vetus 1A

The bent shape is a result of the lone pair. In a trigonal planar shape where there is one lone pair present, the molecular shape is bent because the lone pair repels or pushes away the two surrounding atoms.

Andreana Vetus 1A

My PLF said that these were the only ones that we would really need to know because he usually doesn't go that far, but that it isn't too hard to come up with other hybridization notations. Remember that the exponents should just add up to the number of regions of electron density.

Andreana Vetus 1A

It is also important to remember that there has to be 6 regions of electron density in order for there to be a square planar shape. That is, it is different from tetrahedrals, though they will look similar.

Andreana Vetus 1A

Josephine Chan 1B wrote:Dipole moments occur when there is a difference in electronegativity. It is a measurement of the separation of the two opposite electrical charges.

Does the arrow that we draw to indicate dipole interactions point towards or away from the atom that is most electronegative?

Andreana Vetus 1A

claireg wrote:This might sound really stupid, but what is a dipole?

I have this question too. Also, does this have anything to do with polarity and non polarity?

Andreana Vetus 1A

The resonance hybrid consists of a sort of skeleton of the common features among all the resonance structures. You don't add lone pairs, but you add all other possible dashes, represented as a dotted line.

Andreana Vetus 1A

Ashley P 4I wrote:
Jasmin Argueta 1K wrote:The shortcuts my PLF taught me was FC=sticks+dots around the molecule

I love how simple this is\. Thank you for putting this on here. Do we count the sticks as having two electrons or just counting the litiral sticks?

I also learned this shortcut. The sticks just count as one!

Andreana Vetus 1A

Yes because intensity is what controls the amount of electrons being ejected. Remember that intensity however does not increase the energy of the light.

Andreana Vetus 1A

Yes, as the electron will be happier with a full d orbital vs an s orbital. This is always.

Andreana Vetus 1A

As easy way to remember the difference between Lewis acids and cases is to connect the “a” in acid to the “a” in accept (acids accept electrons). Bases is then left to be the choice that donates electrons.

Andreana Vetus 1A

When it comes to actually drawing the structures, put giant brackets around the whole drawing to indicate the quantity and then mark the charge outside the brackets on the top right corner.

Andreana Vetus 1A

It doesn't matter where you place them, but remember that t=each side can only have 2. Also, a dash between two elements means the same thing as having 2 dots.

Andreana Vetus 1A

Can someone explain the difference between electron affinity, electronegativity, and ionization energy? Is there a way to easily distinguish the three?

Andreana Vetus 1A

How do we go about solving Heisenberg problems? I understand that this equation represents the uncertainty of position in relation to uncertainty of momentum of a particle, but how does the equation help us solve anything?

Andreana Vetus 1A

Blake Salfer 1B wrote:If n=4 l=3 and ml=-3,-2,-1,0,1,2,3 where is the electron located? would the correct answer be 4f?

Could someone explain how to determine where the electron would be located based off of this information?

Andreana Vetus 1A

I also have a question regarding atomic spectra, most specifically Lyman vs. Balmer. I understand that these are atomic spectrum scales, where n represents the energy level. What is the difference between the two series, and why does Lyman have n=1 and Balmer has n=2?

Andreana Vetus 1A

Usually the work function will be provided in the question, or even in a previous question. Professor Lavelle also mentioned that the work function of metals in photoelectric examples were to remain the same, so this may be where we would need to look back on the previous example to see the value of...

Andreana Vetus 1A

Yes, the photoelectric experiment must be done under a vacuum, so that other particles cannot interfere with the electrons. This is the way to most accurately describe the behavior of electrons and the interaction between each photon.

Andreana Vetus 1A

I have a simple question regarding basic chemistry:

How can you determine the reactants in a chemical reaction based off of the products?

Andreana Vetus 1A

How do you know which is the initial molarity, initial volume, final molarity, and/or final volume from a given problem? How do you figure it out? These things are stated in the problem, whether it is explicit or implicit. It helps to identify what the numbers mean in the given problem, and record ...

CHEMISTRY COMMUNITY

Search found 28 matches

Re: Boiling Point

Re: Polarity

Re: AX3E

Re: drawing ligands

Re: Square Planar

Re: Sigma and Pi Bonds

Re: Hydrogen Bond

Re: Naming the Shape

Re: linear vs bent question

Re: Hybridization Notation

Re: Square Planar

Re: How to Identify Dipole Moments

Re: Dipole

Re: Hybrid Resonance

Re: Formal Charge Equation

Re: Photoelectric Effect

Re: Electron Configuration

Re: Lewis acids and bases

Re: Drawing Lewis Structures with Charges

Re: Dot's in the Lewis Structure

Re: Electron Affinity Trend

Re: Heisenberg Equation Confusion

Re: Quantum numbers

Re: Atomic Spectra

Re: Work Function

Re: Photoelectric Effect

Re: formula units [ENDORSED]

Re: Solution Concentration [ENDORSED]