Search found 48 matches

by Adrianh72
Fri Dec 06, 2019 11:17 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand Definition
Replies: 4
Views: 46

Re: Ligand Definition

A ligand is anything that is attached to the metal atom to form the complex.
by Adrianh72
Fri Dec 06, 2019 11:15 am
Forum: Bronsted Acids & Bases
Topic: Lewis vs Bronsted
Replies: 3
Views: 43

Re: Lewis vs Bronsted

Lewis acids and bases deal with what electrons do while Bronsted acids and bases deal with the protons.
by Adrianh72
Tue Dec 03, 2019 5:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Review Session
Replies: 1
Views: 45

Review Session

Is the first review session still happening today? How long should we stay before we can assume the TA isn't going to show up?
by Adrianh72
Fri Nov 29, 2019 12:10 pm
Forum: Naming
Topic: charge of trnasition metal
Replies: 4
Views: 40

Re: charge of trnasition metal

I think they would give us the charge because transition metals can have several, but I think our TAs would be able to give us a definitive answer.
by Adrianh72
Fri Nov 29, 2019 11:59 am
Forum: Lewis Acids & Bases
Topic: Bonds and pH
Replies: 4
Views: 29

Re: Bonds and pH

Shorter bonds are stronger, and so they are less likely to dissociate in water whereas longer bonds are weaker and so more likely to dissociate in water.
by Adrianh72
Fri Nov 29, 2019 11:51 am
Forum: Student Social/Study Group
Topic: Preparing for the final
Replies: 25
Views: 306

Re: Preparing for the final

I'll use videos too, but I have a very short attention span so I have to be actively doing something too. So what I'll do is have my lecture notes open while watching Khan Academy videos and add anything I need to or just annotate my notes for clarity.
by Adrianh72
Wed Nov 27, 2019 11:26 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 3
Views: 39

Re: Polydentate

A polydentate ligand has mutiple bonds around the central atom, so I suppose the best way to determine if a ligand is one is through drawing the structure.
by Adrianh72
Wed Nov 27, 2019 11:21 pm
Forum: Hybridization
Topic: Sigma and Pi Bonds
Replies: 21
Views: 135

Re: Sigma and Pi Bonds

The way I go about this (specifically on Test #2) is I label one bond as a sigma bond in each bond and then go back and fill the rest in with pi bonds.
by Adrianh72
Sun Nov 24, 2019 3:22 pm
Forum: Administrative Questions and Class Announcements
Topic: Attach Pictures
Replies: 3
Views: 83

Re: Attach Pictures

Go past the Privacy waver and there is another box titled "Options". next to this tab is an "Attachments" tab. Click it and then click add file.

Screen Shot 2019-11-24 at 3.21.15 PM.png
by Adrianh72
Sun Nov 24, 2019 3:01 pm
Forum: Naming
Topic: Week 9 and Week 10 HW?
Replies: 21
Views: 240

Re: Week 9 and Week 10 HW?

I'm sure the TA's will accept that. I would just label what's week 9 and week 10.
by Adrianh72
Sun Nov 24, 2019 3:00 pm
Forum: Biological Examples
Topic: Transition Metals & Oxidation States
Replies: 1
Views: 23

Re: Transition Metals & Oxidation States

It's because they have several electrons with similar energies so many of them can be removed.
by Adrianh72
Sun Nov 24, 2019 2:48 pm
Forum: Naming
Topic: Naming
Replies: 3
Views: 42

Re: Naming

I believe in class he mentioned that even though they have come out with new names, labs still use the old ones. So I would probably focus on the "Name" column.
by Adrianh72
Sat Nov 16, 2019 7:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Formula
Replies: 7
Views: 53

Re: VSEPR Formula

Yes we do because, for instance, what distinguishes linear from bent shape are the lone pairs so we must look at them when determining molecular shape.
by Adrianh72
Sat Nov 16, 2019 7:54 pm
Forum: Bronsted Acids & Bases
Topic: Test2
Replies: 7
Views: 96

Re: Test2

Maria Poblete 1D wrote:Test 2 should cover everything from after the midterm (around Focus 2D) up to the VSEPR model and bonding angles. Hope this helped!


Will we need to memorize all the molecular shapes by test 2?
by Adrianh72
Sat Nov 16, 2019 7:50 pm
Forum: General Science Questions
Topic: Test 2
Replies: 5
Views: 61

Re: Test 2

It's anything covered in class from the midterm until now. So mostly dipole moments and VSEPR I'd say.
by Adrianh72
Fri Nov 15, 2019 7:59 pm
Forum: Hybridization
Topic: Hybridization
Replies: 3
Views: 55

Re: Hybridization

Today in lecture, Dr. Lavelle pointed out that we'll be going over hybridization on Monday. I know it doesn't help you now, but just wanted to make sure you know that he will be going over it.
by Adrianh72
Fri Nov 15, 2019 7:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 5
Views: 70

Re: Bond Angles

Arianna Perea 3H wrote:The more lone pairs there are, the smaller the angles get?

Not always because sometimes the lone pairs are on opposite sides so the repulsions can cancel each other out.
by Adrianh72
Sun Nov 10, 2019 11:57 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: What is hydrogen bonding?
Replies: 3
Views: 26

Re: What is hydrogen bonding?

The elements in the second period, F,O, and N have the electronegativity needed to form these bonds.
by Adrianh72
Sun Nov 10, 2019 11:45 am
Forum: Dipole Moments
Topic: HW this week
Replies: 6
Views: 57

Re: HW this week

I think we can do some chemical bonds but some of it should be from the new stuff. Just because chemical bonds are still "recently covered".
by Adrianh72
Thu Nov 07, 2019 8:12 pm
Forum: Einstein Equation
Topic: Wavelength and KE
Replies: 2
Views: 129

Re: Wavelength and KE

By using the DeBroglie and Kinetic Energy Equations, wavelength comes out equaling λ = h/√(2mE)
by Adrianh72
Wed Nov 06, 2019 12:12 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.1
Replies: 3
Views: 128

Re: 1E.1

The value of l increases because the l value for an s-orbital is 0 and the l value for a p-orbital is 1.
by Adrianh72
Fri Nov 01, 2019 4:12 pm
Forum: Dipole Moments
Topic: Dipole Arrow
Replies: 3
Views: 28

Re: Dipole Arrow

Does anyone know why the arrow always points to the negative one? I tried searching up an explanation for my answer above, but couldn't find one.
by Adrianh72
Fri Nov 01, 2019 3:56 pm
Forum: Dipole Moments
Topic: Dipole Arrow
Replies: 3
Views: 28

Re: Dipole Arrow

Yes, the arrows that represent the dipole moment always point towards the partially negative atom.
by Adrianh72
Fri Nov 01, 2019 3:53 pm
Forum: Ionic & Covalent Bonds
Topic: Distorted e- with Ionic Bonds
Replies: 5
Views: 77

Re: Distorted e- with Ionic Bonds

By almost shared is it like the electrons are transferred back and forth between atoms or what? I'm confused about this concept too.
by Adrianh72
Fri Nov 01, 2019 3:43 pm
Forum: Lewis Structures
Topic: Lone Pairs
Replies: 10
Views: 88

Re: Lone Pairs

Katherine Brenner 3H wrote:Will you have lone pairs during an ionic bond?

In covalent Lewis Dot Structures, we usually look at shared electrons vs. lone pairs, but in ionic bonds, we don't have those shared electrons, so technically all the electrons are lone pairs.
by Adrianh72
Fri Nov 01, 2019 3:37 pm
Forum: Octet Exceptions
Topic: Octet Exception
Replies: 5
Views: 70

Re: Octet Exception

Main group elements in period 3 and downward, radicals, and elements in a molecule with an odd number of electrons can all break the octet rule.
by Adrianh72
Sat Oct 26, 2019 3:40 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Noble Gas Configuration
Replies: 10
Views: 107

Re: Noble Gas Configuration

Noble gas notation is mainly used out of pure convenience. You can use it whenever, but it makes more sense to use it for the elements with larger atomic numbers. I, personally, would use it for the elements after Neon.
by Adrianh72
Sat Oct 26, 2019 3:34 pm
Forum: Lewis Structures
Topic: Shape of bonds?
Replies: 2
Views: 35

Re: Shape of bonds?

Right now, we are just expected to put the atom with lowest ionization energy in the center and make it symmetrical if possible. Our next section is called "Molecular Shape and Structure", so I think we'll learn this in detail here.
by Adrianh72
Fri Oct 25, 2019 9:37 pm
Forum: Ionic & Covalent Bonds
Topic: Meaning of Brackets
Replies: 7
Views: 66

Re: Meaning of Brackets

Here, they indicate that the shorthand electron configuration is being used. Meaning that it starts with the previous noble gas and then continues from there rather than starting at 1s.
by Adrianh72
Fri Oct 25, 2019 9:34 pm
Forum: Ionic & Covalent Bonds
Topic: Expanded Valence Shells
Replies: 4
Views: 45

Re: Expanded Valence Shells

An expanded valence shell is one that has more than 8 electrons. Only some elements can have them and so if a lewis structure shows more than 8 electrons, it has an expanded shell.
by Adrianh72
Fri Oct 25, 2019 9:32 pm
Forum: Resonance Structures
Topic: Lewis Structure vs. Resonance Structure
Replies: 4
Views: 57

Re: Lewis Structure vs. Resonance Structure

A resonance structure is just made up of the several lewis structure variations that can occur.
by Adrianh72
Sun Oct 20, 2019 8:34 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Exceptions to Orbital Rules
Replies: 8
Views: 113

Re: Exceptions to Orbital Rules

Since Dr. Lavelle said we only needed to know the first row of the d-block, Chromium (Cr) and Copper (Cu) are the only exceptions we need to know. And this is because they are d5 and d10, respectively.
by Adrianh72
Sun Oct 20, 2019 8:21 pm
Forum: Properties of Light
Topic: Wave Properties of Sound
Replies: 4
Views: 70

Re: Wave Properties of Sound

Yes. Noise cancelling headphones are an example of this. The way they work is that they try to replicate the noise of your surrounding, but out of phase. So when the sound waves produced by the headphones interact with the sound waves from the ambient noise, wave destruction occurs and the sound is ...
by Adrianh72
Sun Oct 20, 2019 8:15 pm
Forum: Properties of Light
Topic: Homework 4
Replies: 4
Views: 73

Re: Homework 4

I believe so because we are still learning about the quantum world in lecture.
by Adrianh72
Sun Oct 20, 2019 4:58 pm
Forum: Quantum Numbers and The H-Atom
Topic: Unfamiliar Terminology in Questions 1D 15-17
Replies: 2
Views: 39

Re: Unfamiliar Terminology in Questions 1D 15-17

Principal means n, orbital means l, and magnetic is ml.
by Adrianh72
Sun Oct 20, 2019 4:51 pm
Forum: DeBroglie Equation
Topic: Units for mass
Replies: 4
Views: 75

Re: Units for mass

It usually makes more real-life sense to use grams, but since the SI unit is kg, it's often asked for in chemistry problems.
by Adrianh72
Sun Oct 13, 2019 7:23 pm
Forum: Properties of Light
Topic: Intensity & Amplitude
Replies: 7
Views: 133

Intensity & Amplitude

Are intensity and amplitude related to each other in any way? Like does high amplitude equal high intensity or vise versa?
by Adrianh72
Sun Oct 13, 2019 7:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 3 Homework Problems
Replies: 1
Views: 40

Re: Week 3 Homework Problems

Yes. In Dr. Lavelle's email, he said week 3 homework will only be quantum topics.
by Adrianh72
Sun Oct 13, 2019 4:07 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: atomic spectra
Replies: 5
Views: 88

Re: atomic spectra

Atomic spectra is the unique light pattern given off by each element when the atoms are excited. In high school, we did an experiment where we'd burn an element and then look at it through a spectroscope. In the spectroscope, you would see lines of different colors like the ones below. What we were ...
by Adrianh72
Sat Oct 12, 2019 1:52 pm
Forum: Properties of Light
Topic: Constructive & Destructive
Replies: 4
Views: 50

Re: Constructive & Destructive

With constructive interference, the waves are in phase with each other, so you can think of it as being aligned. I like to think of it in terms of "positive" and "negative". Since they are aligned, the positive (parts above the axis) interact with the positive of the other wave a...
by Adrianh72
Sat Oct 12, 2019 1:37 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: H-Atom
Replies: 3
Views: 75

Re: H-Atom

Spectroscopy can be used to identify other atoms as well because each atom has a unique spectra.
by Adrianh72
Sun Oct 06, 2019 5:12 pm
Forum: Photoelectric Effect
Topic: Conditions for the Photoelectric Experiment
Replies: 2
Views: 29

Re: Conditions for the Photoelectric Experiment

I don't know what kind of answer you are looking for (specific or general), but doing experiments in a vacuum decreases the possibilities for error and interference. Photons always move at the speed of light in a vacuum, so doing an experiment outside a vacuum would change that.
by Adrianh72
Sat Oct 05, 2019 5:58 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: Polar v nonPolar
Replies: 4
Views: 665

Re: Polar v nonPolar

To add on to the previous reply, one needs to know an element's general electronegativity to tell whether a molecule is polar or not. The electronegativity trend is shown on the periodic table as increasing from bottom-left to top-right (with some exceptions). So if a molecule is made of atoms on op...
by Adrianh72
Sat Oct 05, 2019 5:49 pm
Forum: Molarity, Solutions, Dilutions
Topic: G 7 problem
Replies: 2
Views: 87

Re: G 7 problem

I'm under the impression that the purpose of this question is to give us practice with explaining/creating lab procedures. The answer given in the book is "Measure 482.2 g of H2O on a balance and pour it into a beaker. Then weigh 27.8 g of KNO3 and mix it with the water until it totally dissolv...
by Adrianh72
Sat Oct 05, 2019 5:39 pm
Forum: Limiting Reactant Calculations
Topic: Two Limiting Reactants
Replies: 5
Views: 4862

Re: Two Limiting Reactants

I'm a little confused. Let's say there are three reactants present. If two of the reactants are used up completely while the other is in excess, are there two limiting reactants? Is this possible?
by Adrianh72
Sat Oct 05, 2019 5:30 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E.15
Replies: 4
Views: 73

Re: E.15

How do we know that (OH)2 is replaced by a sulfur ion? Is it solely based on the fact that sulfide is mentioned in the question?

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