Search found 28 matches

by Andreana Vetus 1A
Sun Dec 09, 2018 8:41 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Boiling Point
Replies: 4
Views: 75

Re: Boiling Point

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?
by Andreana Vetus 1A
Sun Dec 09, 2018 8:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 5
Views: 34

Re: Polarity

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.
by Andreana Vetus 1A
Sun Dec 09, 2018 8:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AX3E
Replies: 18
Views: 85

Re: AX3E

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...
by Andreana Vetus 1A
Sun Dec 02, 2018 10:12 pm
Forum: Naming
Topic: drawing ligands
Replies: 6
Views: 47

Re: drawing ligands

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.
by Andreana Vetus 1A
Sun Dec 02, 2018 10:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Square Planar
Replies: 12
Views: 83

Re: Square Planar

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.
by Andreana Vetus 1A
Sun Dec 02, 2018 10:04 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Sigma and Pi Bonds
Replies: 6
Views: 38

Re: Sigma and Pi Bonds

Yes. Every bonding region has one sigma bond. All additional bonds are pi bonds.
by Andreana Vetus 1A
Sun Nov 25, 2018 10:33 pm
Forum: Ionic & Covalent Bonds
Topic: Hydrogen Bond
Replies: 7
Views: 57

Re: Hydrogen Bond

Can someone explain what Hydrogen Bonding is? What is the difference from covalent bonds?
by Andreana Vetus 1A
Sun Nov 25, 2018 10:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Naming the Shape
Replies: 16
Views: 111

Re: Naming the Shape

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...
by Andreana Vetus 1A
Sun Nov 25, 2018 10:26 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: linear vs bent question
Replies: 7
Views: 58

Re: linear vs bent question

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.
by Andreana Vetus 1A
Sun Nov 18, 2018 12:30 am
Forum: Hybridization
Topic: Hybridization Notation
Replies: 2
Views: 45

Re: Hybridization Notation

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.
by Andreana Vetus 1A
Sun Nov 18, 2018 12:06 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Square Planar
Replies: 5
Views: 51

Re: Square Planar

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.
by Andreana Vetus 1A
Sun Nov 18, 2018 12:03 am
Forum: Dipole Moments
Topic: How to Identify Dipole Moments
Replies: 3
Views: 40

Re: How to Identify Dipole Moments

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?
by Andreana Vetus 1A
Sun Nov 11, 2018 7:27 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Dipole
Replies: 3
Views: 32

Re: Dipole

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?
by Andreana Vetus 1A
Sun Nov 11, 2018 7:22 pm
Forum: Resonance Structures
Topic: Hybrid Resonance
Replies: 4
Views: 72

Re: Hybrid Resonance

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.
by Andreana Vetus 1A
Sun Nov 11, 2018 7:19 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Equation
Replies: 13
Views: 139

Re: Formal Charge Equation

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!
by Andreana Vetus 1A
Sun Nov 04, 2018 9:51 pm
Forum: Properties of Light
Topic: Photoelectric Effect
Replies: 7
Views: 122

Re: Photoelectric Effect

Yes because intensity is what controls the amount of electrons being ejected. Remember that intensity however does not increase the energy of the light.
by Andreana Vetus 1A
Sun Nov 04, 2018 9:30 pm
Forum: Properties of Electrons
Topic: Electron Configuration
Replies: 7
Views: 59

Re: Electron Configuration

Yes, as the electron will be happier with a full d orbital vs an s orbital. This is always.
by Andreana Vetus 1A
Sun Nov 04, 2018 9:01 pm
Forum: Octet Exceptions
Topic: Lewis acids and bases
Replies: 4
Views: 52

Re: Lewis acids and bases

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.
by Andreana Vetus 1A
Sun Oct 28, 2018 8:58 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures with Charges
Replies: 6
Views: 68

Re: Drawing Lewis Structures with Charges

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.
by Andreana Vetus 1A
Sun Oct 28, 2018 8:57 pm
Forum: Lewis Structures
Topic: Dot's in the Lewis Structure
Replies: 10
Views: 71

Re: Dot's in the Lewis Structure

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.
by Andreana Vetus 1A
Sun Oct 28, 2018 8:54 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity Trend
Replies: 9
Views: 105

Re: Electron Affinity Trend

Can someone explain the difference between electron affinity, electronegativity, and ionization energy? Is there a way to easily distinguish the three?
by Andreana Vetus 1A
Sun Oct 21, 2018 6:10 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Equation Confusion
Replies: 4
Views: 52

Re: Heisenberg Equation Confusion

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?
by Andreana Vetus 1A
Sun Oct 21, 2018 5:32 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Quantum numbers
Replies: 5
Views: 58

Re: Quantum numbers

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?
by Andreana Vetus 1A
Sun Oct 21, 2018 5:01 pm
Forum: Properties of Electrons
Topic: Atomic Spectra
Replies: 2
Views: 31

Re: Atomic Spectra

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?
by Andreana Vetus 1A
Fri Oct 12, 2018 4:01 pm
Forum: Properties of Light
Topic: Work Function
Replies: 2
Views: 40

Re: Work Function

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...
by Andreana Vetus 1A
Fri Oct 12, 2018 3:41 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 1
Views: 24

Re: Photoelectric Effect

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.
by Andreana Vetus 1A
Fri Oct 05, 2018 6:05 pm
Forum: SI Units, Unit Conversions
Topic: formula units [ENDORSED]
Replies: 68
Views: 20005

Re: formula units [ENDORSED]

I have a simple question regarding basic chemistry:

How can you determine the reactants in a chemical reaction based off of the products?
by Andreana Vetus 1A
Fri Oct 05, 2018 5:51 pm
Forum: SI Units, Unit Conversions
Topic: formula units [ENDORSED]
Replies: 68
Views: 20005

Re: Solution Concentration [ENDORSED]

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 ...

Go to advanced search