## Search found 30 matches

Sun Dec 09, 2018 5:38 pm
Forum: Amphoteric Compounds
Topic: Examples
Replies: 5
Views: 382

### Re: Examples

See group 13 for amphora compounds we talked about in class.
Sun Dec 09, 2018 5:37 pm
Forum: DeBroglie Equation
Topic: Calculating Velocity
Replies: 9
Views: 877

### Re: Calculating Velocity

Make sure you know the Difference!!!
p=mv is for the velocity of a photon, he will usually give you the momentum.

Ke is for Electrons!
Sun Dec 09, 2018 5:36 pm
Forum: Hybridization
Topic: Hybrid Orbitals
Replies: 6
Views: 377

### Re: Hybrid Orbitals

Hybrid orbitals are in correspondence to the regions of electron density! if 3 regions = sp2
Sun Dec 09, 2018 5:34 pm
Forum: Properties of Light
Topic: wavelength
Replies: 11
Views: 939

### Re: wavelength

The wavelength is the distance from one peak of the wave to the other peak, the shorter the wavelength the higher the frequency
Sun Dec 09, 2018 5:34 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: acid rain formula
Replies: 4
Views: 181

### Re: acid rain formula

It is really important to note that the "acid rain" is just an example of a Acid molecule that can donate more then one H+
Sun Dec 09, 2018 5:33 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Why HF is a weaker acid than HCl
Replies: 17
Views: 3276

### Re: Why HF is a weaker acid than HCl

Because there is no O present, think of it as simple terms. H attached to an F that is small in radius is going to have a short bond, But CLs radius is bigger so longer bond, more easily broke, more acidic.
Sun Dec 09, 2018 5:31 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Why HClO2 is a stronger acid than HBrO2?
Replies: 6
Views: 8390

### Re: Why HClO2 is a stronger acid than HBrO2?

HBrO2 I believe is actually stronger because the O will pull the Br away from the H more so then the O will pull the Cl away from the H. Always the more electro neg atom is the strongest acid.
Sun Dec 09, 2018 5:28 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Ligands
Replies: 6
Views: 401

### Re: Ligands

Sun Dec 09, 2018 5:28 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Strength of Acids vs. Number of Oxygens
Replies: 6
Views: 867

### Re: Strength of Acids vs. Number of Oxygens

It increases because the longer the bond, the weaker the bond, and when it deprotonates, the solution will have the strong acidic solution
Fri Dec 07, 2018 11:20 am
Forum: Bronsted Acids & Bases
Topic: Alkali vs Alkaline
Replies: 2
Views: 210

### Alkali vs Alkaline

What is the difference between Alkali Metal and Alkaline Metal. Strength between acid and bace?? Can you use it in a formula with water?
Sat Dec 01, 2018 7:12 pm
Forum: Hybridization
Topic: Regions of Electron Desnity
Replies: 5
Views: 161

### Re: Regions of Electron Desnity

One thing I got confused on with this is when there is just one lone electron, lets say there is 41 electrons total and every element has an octet, you don't count the lone electron as a region of electron density, I believe you just ignore it, unless I am mistaken.
Sat Dec 01, 2018 7:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Types of intramolecular forces
Replies: 4
Views: 211

### Re: Types of intramolecular forces

The way I mentally do these types of problems is process of elimination. First I see if it has AX4, and all the Xs are the same element. Right away I know its non polar. All non polar molecules are induced dipole-dipole. If this is not the case, I always start by looking at the Lewis structure and s...
Sat Dec 01, 2018 7:01 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar Molecules
Replies: 12
Views: 285

### Re: Polar Molecules

The way that I mentally do this is in my head add up all the valence electrons, then divide by 8. If the total number of v-electrons is not a factor of 8, there must be Lone pairs. When ever you have 1 pair of lone pairs, the molecule will be polar. Be careful because some lone pairs can surround mo...
Sat Dec 01, 2018 6:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Dissociation energy
Replies: 7
Views: 244

### Re: Dissociation energy

The dissociation energy is the energy required to break a bond. The greater the bond strength the greater the dissociation energy must be. This is a way to look at the dissociation E as a positive value. I think of it as going from weak (small value) to a strong (large value) bond. Weak -> big atomi...
Sat Nov 24, 2018 12:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VESPR Geometric Shapes
Replies: 1
Views: 110

### VESPR Geometric Shapes

Can trigonal bipyramidal be drawn with a lone pair? The VESPR formula is AX5. Lets say that Trigonal Bipyramidal can be drawn with a lone pair, and so it now has a seesaw shape. What about the Square Pyramidal? The VESPR formula is AX5 as well. How do you differentiate weither to draw a Trigonal Bip...
Fri Nov 16, 2018 6:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Planar vs Pyramidal
Replies: 5
Views: 215

### Re: Planar vs Pyramidal

A trigonal planar has 3 bonding regions while trigonal pyramidal has 4. Also if there are 2 pairs of LP electrons they are not necessarily opposite to each other because the 3 surfaces you can put them on are all "neighboring" so when you visualize this, keep this in mind that although the...
Fri Nov 16, 2018 6:21 pm
Forum: Lewis Structures
Topic: Expanded Octet
Replies: 8
Views: 356

### Re: Expanded Octet

Any element in the 3rd period and down can have an expanded octet. Also row 13 has some exceptions to the octet rule. Remember H only can can 1 bond!
Sun Nov 04, 2018 10:47 pm
Forum: Properties of Electrons
Topic: Change in Energy
Replies: 3
Views: 427

### Re: Change in Energy

Think " Energy is released as you go towards the Nucleus", the change in E is negative. Also Delta E = Ef - Ei so if you are going from N=3 to N=1, Delta E= 1 - 3 = -2
Sun Nov 04, 2018 10:44 pm
Forum: Lewis Structures
Topic: Expanded Octet Atoms/Exceptions
Replies: 2
Views: 96

### Re: Expanded Octet Atoms

I believe it is as follows:

Never a full Octet:

1. H, He, Li, and B

2. Column 13

Exceeds Octet:

1. all Elements including and after row 3.
Sun Nov 04, 2018 10:41 pm
Forum: Properties of Light
Topic: Photoelectric Effect
Replies: 7
Views: 381

### Re: Photoelectric Effect

I am having trouble with when to use the equation E=hv(frequency) and when to use E=hc/Wavelength I understand that the 1s is used for "electromagnetic radiation" and the second is "photons and light" but in an example it asked for frequency of the lazerpointer and the correct an...
Sun Oct 28, 2018 9:33 am
Forum: Ionic & Covalent Bonds
Topic: Valence electrons
Replies: 8
Views: 224

### Re: Valence electrons

When dealing with Valence electrons, why is it that the d group is before the P group when we write the configuration (ex: 1s2, 2s2, and so on), I want to better understand the different orbitals conceptually.
Sun Oct 28, 2018 9:30 am
Forum: Ionic & Covalent Bonds
Topic: electronegativity and ionization energy [ENDORSED]
Replies: 4
Views: 206

### Re: electronegativity and ionization energy[ENDORSED]

Ionization Energy is the amount of energy that an isolated atom in a ground state must have in order to discharge an electron! This is seen in our in class notes when we drew the picture of the metal and the equation En - ϕ = Ek where ϕ is the Energy that is needed in order to eject the electron so ...
Sun Oct 28, 2018 9:24 am
Forum: Lewis Structures
Topic: Periodic Table Trends
Replies: 5
Views: 208

### Re: Periodic Table Trends

No they are not the same thing but they are related!
Electron Affinity is the energy released. Electronegativity is the attraction between an atom and a bonding pair of electrons.
Sun Oct 14, 2018 8:28 pm
Forum: Photoelectric Effect
Topic: Sodium metal surface
Replies: 4
Views: 206

### Re: Sodium metal surface

I made sure to state the conservation of energy. E (removal of e) + KE = Total energy of the system (Incident Light)
Sun Oct 14, 2018 8:24 pm
Forum: Properties of Electrons
Topic: Atomic Spectrum: Lines in a Series
Replies: 2
Views: 149

### Atomic Spectrum: Lines in a Series

Hello, In Chapter 1A I am having trouble conceptually understanding why it is important for us to memorize the different series's: Lyman Series, Balmer series, and Paschen Series. I understand that what they all have in common is that the lowest energy lever n1 is "common" to the lines wit...
Sun Oct 14, 2018 8:19 pm
Forum: Properties of Electrons
Topic: Wave Properties of Electrons
Replies: 2
Views: 55

### Re: Wave Properties of Electrons

Constructive interference is when the "peaks" and "troughs" line up constructively and the amplitude is enhanced (taller height). Destructive Interference is when the "peaks" coincide with the "troughs" of anther wave, here the amplitude is diminished. We know...
Sun Oct 07, 2018 4:55 pm
Forum: SI Units, Unit Conversions
Topic: Formula Sheet?
Replies: 6
Views: 244

### Re: Formula Sheet?

Unfortunately I think we have a lot to memorize from formulas to how to convert units, good luck!
Sun Oct 07, 2018 4:53 pm
Forum: Empirical & Molecular Formulas
Topic: Steps to calculating Molecular Formulas
Replies: 3
Views: 242

### Re: Steps to calculating Molecular Formulas

The first video on Audio-Visual Focus-Topics, Assessments & Surveys really helped me with how to calculate empirical and molecular functions!
Sun Oct 07, 2018 4:50 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular Formula
Replies: 12
Views: 242

### Re: Molecular Formula

I counted the number of atoms that make up the molecule.