Search found 19 matches

by daniela3D
Sun Nov 25, 2018 11:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR model formula
Replies: 3
Views: 72

Re: VSEPR model formula

It is meant to predict geometry of a molecule based on lone pairs and attached atoms. In order to solve the formula learn how to identify the bonding electron pairs and lone pairs.
by daniela3D
Sun Nov 25, 2018 11:30 pm
Forum: Lewis Acids & Bases
Topic: How do we know something is a lewis acid or base?
Replies: 4
Views: 112

Re: How do we know something is a lewis acid or base?

Lewis Acid: takes a pair of electrons from another atom
*reasoning 1.) has an incomplete octet 2.) has a double/triple bond
Lewis Base: gives off a pair of electrons to another atom
*can donate to another lone pair
by daniela3D
Sun Nov 25, 2018 11:24 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam
Replies: 22
Views: 530

Re: Final Exam

It's going to be cumulative with 8 questions but each question will have many parts to it like (a) (b) (c)
by daniela3D
Sun Nov 18, 2018 9:55 pm
Forum: Properties of Light
Topic: De Broglie's equation [ENDORSED]
Replies: 7
Views: 446

Re: De Broglie's equation [ENDORSED]

Yes. De Broglie focuses on calculating the wavelength of an object of mass.
When solving wavelengths use: wavelength= h/mv

When solving wavelength of a light or photon use: (E=hv; c=wavelength*frequency; E=hc/wavelength)
by daniela3D
Sun Nov 18, 2018 9:45 pm
Forum: Properties of Light
Topic: Photoelectric Effect
Replies: 8
Views: 257

Re: Photoelectric Effect

The photoelectric effect is a metal surface that emits electrons when light is shun upon it. In order to solve a problem like this you can use the equation: Ephoton- Work Function= Ekinetic . Work Function= property of the metal surface Ephoton: if not given use equations (E=hv; c=wavelength*frequen...
by daniela3D
Sun Nov 18, 2018 9:15 pm
Forum: Properties of Light
Topic: Power calculations
Replies: 6
Views: 265

Re: Power calculations

I actually had this problem too. For instance: if you have a problem in which you are dividing make sure to solve one portion(bottom or top) instead of doing it all at once. Also, if you are dealing with problems that have the power of 10^3 there's a symbol on your calculator that has (EE which repr...
by daniela3D
Sun Nov 11, 2018 11:31 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: What is delta V when given +-5 for example?
Replies: 3
Views: 381

Re: What is delta V when given +-5 for example?

When you see a number that has +- next to it you have to multiply by 2. Hence, 2(5) is the reasoning you acquire 10.
by daniela3D
Sun Nov 11, 2018 11:24 pm
Forum: Ionic & Covalent Bonds
Topic: Metallic Bond
Replies: 7
Views: 135

Re: Metallic Bond

It is a bond with other metallic elements that share electrons causing them to be positively charged.
by daniela3D
Sun Nov 11, 2018 11:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Community Posts
Replies: 3
Views: 119

Re: Chemistry Community Posts

Dr.Lavelle said that Chemistry Community is meant to be a resource for students if they had questions. So if it is a question about the lessons or anything related to his class it is a valid question. All you have to do is post 3 times a week to get some easy points. So the post you made is complete...
by daniela3D
Tue Oct 30, 2018 12:14 am
Forum: Einstein Equation
Topic: de brogile equation
Replies: 6
Views: 484

Re: de brogile equation

If you are trying to calculate the wavelength of a wave of light (i.e. photon) use the 3 Light Equations: E=hv ; c=h[lambda] ; E=hc/[lambda].
But when dealing with moving objects such as cars or balls you use lambda=h/mv.
by daniela3D
Tue Oct 30, 2018 12:04 am
Forum: Limiting Reactant Calculations
Topic: Limiting Reagent
Replies: 10
Views: 513

Re: Limiting Reagent

I don't think that's how it works. You need to find the weight of each reactant separately and compare which one weighs less. The one that weighs less is your limiting reactant.
by daniela3D
Mon Oct 29, 2018 11:51 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Heisenberg
Replies: 2
Views: 101

Re: Heisenberg

Correct! Each time you see +/-, multiply the number given by 2.
by daniela3D
Mon Oct 22, 2018 12:47 am
Forum: Properties of Light
Topic: Do I have to memorize the spectrum?
Replies: 20
Views: 393

Re: Do I have to memorize the spectrum?

He'll most likely provide have that info in the first page of our quizzes/tests. But it's always good to go over it.
by daniela3D
Mon Oct 22, 2018 12:43 am
Forum: DeBroglie Equation
Topic: De Broglie
Replies: 12
Views: 513

Re: De Broglie

The person I have my Peer Learning Sessions with said that most of the time the problems will tell you when to use it. However to identify it, it will ask you for the wavelength of something or the energy emitted as a result to the speed of wavelength (basically anything being questioned wavelengths).
by daniela3D
Mon Oct 22, 2018 12:33 am
Forum: Einstein Equation
Topic: The symbol v?
Replies: 16
Views: 541

Re: The symbol v?

In the lecture about "Wave Properties of Light" frequency and velocity are technically the same. However, their symbols differ from each other: frequency (s^-1)= velocity (m.s^-1)
by daniela3D
Mon Oct 22, 2018 12:33 am
Forum: Einstein Equation
Topic: The symbol v?
Replies: 16
Views: 541

Re: The symbol v?

In the lecture about "Wave Properties of Light" frequency and velocity are technically the same. However, their symbols differ from each other: frequency (s^-1)= velocity (m.s^-1)
by daniela3D
Sun Oct 14, 2018 1:05 am
Forum: Properties of Light
Topic: E=hv
Replies: 13
Views: 248

Re: E=hv

Keep in mind that a photon is always positive.
by daniela3D
Sun Oct 14, 2018 1:01 am
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 166
Views: 100946

Re: Rusty on High School Chem [ENDORSED]

I currently enrolled myself to my Peer Learning Session (PLS) for Chem 14A through AAP and it is very helpful! It is a small group of people with an instructor who has already taken the course who goes over what Lavelle has taught in class and provides work problems to work with.
by daniela3D
Sun Oct 14, 2018 12:57 am
Forum: Empirical & Molecular Formulas
Topic: Going from empirical to Molecular formula
Replies: 14
Views: 667

Re: Going from empirical to Molecular formula

The video modules he has posted on his websites are very helpful. For this question he explains why there has to be a whole number for the empirical formula and if you multiply one number you have to do the same to the rest. Highly recommend if you have not checked it out.

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