Search found 41 matches

by Trent Yamamoto 4I
Mon Nov 18, 2019 11:11 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: 3.F.1 c and d
Replies: 1
Views: 12

3.F.1 c and d

Can someone explain why there are dipole-dipole forces present in 3.F.1 c and d?
by Trent Yamamoto 4I
Sun Nov 17, 2019 6:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Grading
Replies: 7
Views: 32

Re: Grading

From what I've read the curve occurs after the final, but usually it doesn't deviate too much from the standard 70% C, 80% B, and 90% A scale.
by Trent Yamamoto 4I
Sun Nov 17, 2019 6:35 pm
Forum: Hybridization
Topic: Test 2 Topics
Replies: 11
Views: 60

Re: Test 2 Topics

Dr. Lavelle also explicitly said Hybridization would not be on Test 2
by Trent Yamamoto 4I
Sun Nov 17, 2019 6:34 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: repulsion strength
Replies: 5
Views: 10

Re: repulsion strength

lone pair - lone pair has the strongest repulsion, lone pair - atom has the second strongest repulsion, and atom -atom has the least strongest repulsion.
by Trent Yamamoto 4I
Sun Nov 17, 2019 6:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Prediction of Angles
Replies: 4
Views: 14

Re: Prediction of Angles

The bond angles usually follow the same sort of pattern based on regions of electron concentration. It is important to keep in mind the lone pairs though, because these will decrease the expected bond angle.
by Trent Yamamoto 4I
Sun Nov 17, 2019 6:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Dispersion
Replies: 5
Views: 28

Re: Dispersion

I do also know that Dr. Lavelle said that he would focus on covering sigma and pie bonds on Monday, so if he doesn't mention those then I would go over them anyways
by Trent Yamamoto 4I
Mon Nov 11, 2019 10:46 am
Forum: Dipole Moments
Topic: Dipole Moments
Replies: 6
Views: 12

Re: Dipole Moments

Andrea_3F wrote:So can dipole moments be temporary or all they all permanent?


I believe dipole moments are permanent
by Trent Yamamoto 4I
Mon Nov 11, 2019 10:43 am
Forum: Dipole Moments
Topic: Dipole Moment
Replies: 6
Views: 24

Re: Dipole Moment

I believe you can also recognize a dipole moment when there is a polar covalent bond, which by definition is when electrons in a covalent bond are not equally shared.
by Trent Yamamoto 4I
Mon Nov 11, 2019 10:39 am
Forum: Bond Lengths & Energies
Topic: London Forces
Replies: 6
Views: 29

Re: London Forces

Yes, there are electrons in every atom and these cause these forces
by Trent Yamamoto 4I
Mon Nov 11, 2019 10:37 am
Forum: Bond Lengths & Energies
Topic: Van Der Waals BP
Replies: 6
Views: 26

Van Der Waals BP

Which intermolecular force increases boiling point the most?
by Trent Yamamoto 4I
Mon Nov 11, 2019 10:32 am
Forum: Dipole Moments
Topic: Dissociation Energies
Replies: 3
Views: 9

Dissociation Energies

Why is dissociation energy, which is required to break a bond, always positive?
by Trent Yamamoto 4I
Sun Nov 03, 2019 11:43 pm
Forum: Electronegativity
Topic: Electronegativity Ex.
Replies: 2
Views: 20

Electronegativity Ex.

How would you determine which bond has greater ionic character between HCl and HI?
by Trent Yamamoto 4I
Sun Nov 03, 2019 11:40 pm
Forum: Coordinate Covalent Bonds
Topic: Coordinate Covalent Bond
Replies: 1
Views: 22

Coordinate Covalent Bond

Does a coordinate covalent bond only occur with Lewis acids and Bases? (I know Boron Trifluoride was given as an example)
by Trent Yamamoto 4I
Sun Nov 03, 2019 11:30 pm
Forum: Lewis Structures
Topic: Expanded Octet
Replies: 4
Views: 36

Expanded Octet

Lewis structures with expanded octets have lower energy than with the regular octet structure (comparing the formal charge), so is it more stable and therefore more favorable to draw structures with expanded octets?
by Trent Yamamoto 4I
Sun Nov 03, 2019 11:24 pm
Forum: Octet Exceptions
Topic: Period 3
Replies: 2
Views: 24

Period 3

Why can atoms in the third period or higher accommodate more than 8 valence electrons?
by Trent Yamamoto 4I
Sun Nov 03, 2019 11:02 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Distorted e- as highly polarizable
Replies: 5
Views: 43

Distorted e- as highly polarizable

Why are highly distorted electrons described as being highly polarizable? Which characteristics result in the ionic bond being more covalent in character?
by Trent Yamamoto 4I
Sun Nov 03, 2019 10:57 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Kinetic Energy Uncertainty Conversion
Replies: 3
Views: 33

Re: Kinetic Energy Uncertainty Conversion

Kevin Antony 1J wrote:From what I gather, you know have energy per electron. We know there are 6.022 x 10^23 electrons in a mol. If you divide by Avagadro's number you should get energy per mol.


That makes sense, thank you!
by Trent Yamamoto 4I
Sun Nov 03, 2019 10:55 pm
Forum: Resonance Structures
Topic: Drawing Resonance Structures
Replies: 2
Views: 39

Drawing Resonance Structures

During my discussion, it was mentioned that when drawing resonance structures that if, let's say there's two double bonds, you can hold that one double bond constant and rotate the other around to other pairs. Would this account for all of the possible answers that would be required for a question a...
by Trent Yamamoto 4I
Sun Nov 03, 2019 8:45 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Kinetic Energy Uncertainty Conversion
Replies: 3
Views: 33

Kinetic Energy Uncertainty Conversion

In the Heisenberg Indeterminacy Module, question 22 asked for the uncertainty in kinetic energy (which I was able to calculate) and the conversion of that into moles. How would I do that?
by Trent Yamamoto 4I
Sun Nov 03, 2019 8:42 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Manipulating for the initial energy level
Replies: 2
Views: 33

Manipulating for the initial energy level

When we're solving for the initial energy level in a transition using E=hv and E= -hR/(n^2 final) + hR/(n^2 initial), should the manipulation to find the initial energy level be done at the beginning of the problem to isolate n initial or should you just plug in the values and solve for it algebraic...
by Trent Yamamoto 4I
Wed Oct 16, 2019 10:58 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: What does the "x" indicate in (i.e.) the 2px state? [ENDORSED]
Replies: 5
Views: 23

Re: What does the "x" indicate in (i.e.) the 2px state? [ENDORSED]

The x is in reference to the plane, among the x, y, and z planes
by Trent Yamamoto 4I
Wed Oct 16, 2019 10:54 pm
Forum: Quantum Numbers and The H-Atom
Topic: Stern and Gerlach
Replies: 5
Views: 32

Re: Stern and Gerlach

My key takeaway from the experiment was that electrons have different spins (spin up vs. spin down), which create different electric fields.
by Trent Yamamoto 4I
Wed Oct 16, 2019 10:42 pm
Forum: *Shrodinger Equation
Topic: Hamiltonian
Replies: 5
Views: 39

Re: Hamiltonian

A Hamiltonian is a second derivative (ie. d/dx[sinx]= cosx d/dx[cosx]= -sinx)
by Trent Yamamoto 4I
Wed Oct 16, 2019 10:38 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Best Way To Study?
Replies: 53
Views: 203

Re: Best Way To Study?

Hi! I've found it very helpful to take lecture notes on a notepad, then the following day condensing the notes into a separate notebook. I've found it really useful in helping the information stick and it makes referring to my notes so much easier. It'll also help having a notebook full of notes for...
by Trent Yamamoto 4I
Wed Oct 16, 2019 10:34 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Incorrect Atom Model
Replies: 3
Views: 23

Incorrect Atom Model

What specifically makes the answer from the incorrect atom model's (electron located inside of the nucleus) application of the Heisenberg Equation 'unrealistic?'
by Trent Yamamoto 4I
Wed Oct 16, 2019 10:25 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Untrue PSI From Lecture
Replies: 2
Views: 18

Untrue PSI From Lecture

At the end of today's lecture, Lavelle wrote some PSI values on the board and said that they were untrue. One of them was PSI (1, 1, 0, +1/2); can someone explain why this wouldn't be able to exist?
by Trent Yamamoto 4I
Sun Oct 13, 2019 9:14 pm
Forum: DeBroglie Equation
Topic: Concept of a wave
Replies: 7
Views: 57

Re: Concept of a wave

DeBroglie is used when detecting extremely small masses (unlike the car example in lecture).
by Trent Yamamoto 4I
Sun Oct 13, 2019 12:07 am
Forum: Properties of Light
Topic: e=hv
Replies: 7
Views: 39

Re: e=hv

e=hv is in regards to energy per photon, which directly relates to light.
by Trent Yamamoto 4I
Sun Oct 13, 2019 12:06 am
Forum: DeBroglie Equation
Topic: De Broglie's Equation
Replies: 13
Views: 67

Re: De Broglie's Equation

De Broglie is applied when we are solving for an object's wavelength, and the the resting mass is given. For example, it could be the baseball being hit or a car moving.
by Trent Yamamoto 4I
Sun Oct 13, 2019 12:01 am
Forum: Properties of Light
Topic: Speed of Light
Replies: 41
Views: 785

Re: Speed of Light

The speed of light is a constant (3*10^8) and is always reflected as so on the constant sheet.
by Trent Yamamoto 4I
Sat Oct 12, 2019 11:59 pm
Forum: Photoelectric Effect
Topic: Wave-like Properties
Replies: 4
Views: 37

Re: Wave-like Properties

After seeing the use of the mass of the car example in lecture, you can see that the larger the mass the smaller the wavelength properties. This would make it not detectable.
by Trent Yamamoto 4I
Sat Oct 12, 2019 11:56 pm
Forum: Properties of Light
Topic: Frequency vs. Wavelength
Replies: 15
Views: 72

Re: Frequency vs. Wavelength

The easiest way that I characterize frequency and wavelength is that they are inversely proportional to one another.
by Trent Yamamoto 4I
Sat Oct 12, 2019 11:53 pm
Forum: Photoelectric Effect
Topic: Mass of Electron
Replies: 6
Views: 33

Re: Mass of Electron

The mass of an electron is 9.10938 × 10-31 kg
by Trent Yamamoto 4I
Thu Oct 03, 2019 9:59 pm
Forum: Molarity, Solutions, Dilutions
Topic: Clarification
Replies: 7
Views: 78

Re: Clarification

Do the moles of a solute change when being diluted at all, in any instance? If not, why? The moles of a solute never change when being diluted. Imagine you're making a cup of hot cocoa by pouring in a packet of cocoa mixture into a mug of water. Even if you added more water to the mug, the amount of...
by Trent Yamamoto 4I
Thu Oct 03, 2019 9:49 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Question on F.1 Part B
Replies: 3
Views: 31

Re: Question on F.1 Part B

The number of atoms are given in the molecular formula, and since you are trying to get to the grams of that element divided by the molar mass in order to find the the mass percentage composition, you wouldn't have to use Avogadro's number.
by Trent Yamamoto 4I
Thu Oct 03, 2019 9:39 pm
Forum: Empirical & Molecular Formulas
Topic: 100 gram Method?
Replies: 9
Views: 74

Re: 100 gram Method?

The "100 gram" trick makes it really easy when using the mass composition to get to the empirical formula. If the mass composition were given to you in a problem (say, 25% C 50% H and 25% O), it would be very convenient to imagine these percentages out of 100 grams. There would be 25g C, 5...
by Trent Yamamoto 4I
Thu Oct 03, 2019 9:30 pm
Forum: Limiting Reactant Calculations
Topic: Calculating Theoretical Yield
Replies: 9
Views: 73

Re: Calculating Theoretical Yield

Usually the amount of the limiting reactant is given in the problem, but it can either be in moles or grams. After you figure out what the limiting reactant is, you can multiply that based on the mole ratio and molar mass of the product you're trying to find the theoretical yield for to get the actu...
by Trent Yamamoto 4I
Thu Oct 03, 2019 9:26 pm
Forum: Balancing Chemical Reactions
Topic: Homework
Replies: 4
Views: 51

Re: Homework

I'm pretty sure right corner would be preferred. I put my name, UID, lecture, and discussion in the top right corner
by Trent Yamamoto 4I
Thu Oct 03, 2019 9:22 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Avogadro's Number
Replies: 8
Views: 89

Re: Avogadro's Number

Since Avogadro's number represents the number of atoms in 1 mole. On E7, you would divide 2.1 x 10^9 by Avogadro's number (6.022 x 10^23) to get the number of moles of Carbon.
by Trent Yamamoto 4I
Thu Oct 03, 2019 9:17 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: HW E. 1
Replies: 3
Views: 46

HW E. 1

For this question (Fundamentals E.1), I don't understand why 288pm was used instead of the given 144pm. How did they get to this unit of measure?

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