Search found 33 matches

by Raphael_SanAndres3C
Sat Dec 08, 2018 3:28 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Usuing Rydberg's Equation Conceptually
Replies: 1
Views: 140

Usuing Rydberg's Equation Conceptually

For Rydberg's equation, I have seen in previous threads that the negative means that the there is a decrease in energy. So, should I proceed with the problem with the negative from the formula or add the negative in the end. For example, if I am trying to find the energy emitted from when the level ...
by Raphael_SanAndres3C
Fri Dec 07, 2018 9:31 pm
Forum: Lewis Acids & Bases
Topic: HCl vs. HI
Replies: 7
Views: 112

Re: HCl vs. HI

I think bond length and electronegativity are directly related since the more electronegative an ion is, the shorter the bond length, the less acidic it is.
by Raphael_SanAndres3C
Fri Dec 07, 2018 5:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Correct Bond Angles
Replies: 6
Views: 124

Re: Correct Bond Angles

The angles of molecules with lone pair electrons always push the other bonds out of place and closer together, thus the bond angles are smaller in such situations.
by Raphael_SanAndres3C
Thu Dec 06, 2018 3:30 pm
Forum: General Science Questions
Topic: Studying Methods
Replies: 6
Views: 326

Studying Methods

How would anyone recommend studying for the final? Would videos on youtube or practice questions be better practice?
by Raphael_SanAndres3C
Sun Dec 02, 2018 6:30 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Soapy Feels
Replies: 3
Views: 157

Re: Soapy Feels

They react with the acidic outside of our skin.
by Raphael_SanAndres3C
Tue Nov 27, 2018 12:33 pm
Forum: Hybridization
Topic: How to Write Second Pi Bond in Triple Bond
Replies: 3
Views: 69

Re: How to Write Second Pi Bond in Triple Bond

Olivia L 3D wrote:I just asked my TA this today and he said it would be (Cp -Cp) because they are the same type of bond. The compositions are the same but there are more than one.


Thanks!
by Raphael_SanAndres3C
Tue Nov 27, 2018 10:06 am
Forum: Hybridization
Topic: How to Write Second Pi Bond in Triple Bond
Replies: 3
Views: 69

How to Write Second Pi Bond in Triple Bond

For example, in acetylene (C2H2) there is a triple bond between the two carbons. So, the sigma bond is (Csp - H1) for both carbons to hydrogens (since the shape is linear). For the first sigma bond between the two carbons it would be (Csp - Csp) and for the first pi bond it would be (Cp - Cp). Howev...
by Raphael_SanAndres3C
Sun Nov 25, 2018 6:46 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: induced-dipole
Replies: 4
Views: 98

Re: induced-dipole

A dipole occurs when there is one side of the atom that is more electronegative than the other. However, an induced-dipole occurs when a non-polar molecule interacts with a dipole and since there is a preference for electronegativity on one side of the dipole, the non-polar molecule will shift its e...
by Raphael_SanAndres3C
Sun Nov 25, 2018 6:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 3 material
Replies: 6
Views: 147

Re: Test 3 material

My TA mentioned that it would be all material from after the midterm to last friday.
by Raphael_SanAndres3C
Sun Nov 25, 2018 6:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma vs pi bonds
Replies: 7
Views: 100

Re: Sigma vs pi bonds

Think of sigma bonds being the inital bond between two molecules and every additional bond being a pi bond.
by Raphael_SanAndres3C
Sun Nov 18, 2018 9:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles Between the Same shape
Replies: 6
Views: 86

Bond Angles Between the Same shape

Will the bond angles be the same for all bent VESPR shapes or does electron affinity or density play a role on the bond angle?
by Raphael_SanAndres3C
Sun Nov 18, 2018 9:45 pm
Forum: Properties of Light
Topic: Test 3
Replies: 24
Views: 496

Re: Test 3

Lavelle has some helpful outlines that covers what things are needed for the test.
by Raphael_SanAndres3C
Sun Nov 18, 2018 9:43 pm
Forum: General Science Questions
Topic: Thanksgiving Week
Replies: 8
Views: 294

Re: Thanksgiving Week

No lecture on Wednesday, Thursday, or Friday.
by Raphael_SanAndres3C
Sun Nov 18, 2018 9:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Resonance Structures and bond angles
Replies: 4
Views: 157

Re: Resonance Structures and bond angles

For the bond length part of the question, the bond length does not affect the shape since the electron cloud is evenly distributed throughout the resonance structure so that there is an even length between the bonds that are in resonance.
by Raphael_SanAndres3C
Sun Nov 18, 2018 9:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs
Replies: 5
Views: 70

Re: Lone pairs

Yes. A lone pair adds one more electron cloud to the shape which changes the shape (and in turn the name) as well as the bond angles.
by Raphael_SanAndres3C
Wed Nov 14, 2018 12:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining VSEPR bond angles
Replies: 5
Views: 92

Re: Determining VSEPR bond angles

Will we be tested on bond angles at all? If so, is there a set amount of angles that we should memorize?
by Raphael_SanAndres3C
Wed Nov 14, 2018 12:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Octet Rule
Replies: 6
Views: 167

Re: Octet Rule

Elements in the third period can utilize the d oribital, thus allowing it to have more than an octet. However, you do not want to not have at least an octet with all your elements (with the exceptions being H, He, Li, and Be).
by Raphael_SanAndres3C
Wed Nov 14, 2018 11:59 am
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving week
Replies: 10
Views: 286

Re: Thanksgiving week

He said he wants to cancel class on Wednesday but only if we can get through enough content. He has not stated his decision yet.
by Raphael_SanAndres3C
Sun Nov 04, 2018 1:06 pm
Forum: Empirical & Molecular Formulas
Topic: garlic bread midterm practice #2
Replies: 5
Views: 143

Re: garlic bread midterm practice #2

Most likely the error is from a rounding thing from somewhere in your calculations considering the number you are multiplying by is big yet the amount of error is pretty minor.
by Raphael_SanAndres3C
Sat Nov 03, 2018 11:30 pm
Forum: Ionic & Covalent Bonds
Topic: Chem Midterm
Replies: 13
Views: 176

Re: Chem Midterm

8 parts but Lavelle said that there would be a homework question on the test.
by Raphael_SanAndres3C
Sat Oct 27, 2018 8:12 pm
Forum: Lewis Structures
Topic: Lewis Dot Structures
Replies: 3
Views: 78

Re: Lewis Dot Structures

The bonds are usually dependent on the amount of electrons two atoms share. Thus, bonds will be a double bond when four electrons are shared between two atoms and a bond will be a single bond when two electrons are shared between atoms.
by Raphael_SanAndres3C
Sat Oct 27, 2018 8:09 pm
Forum: Ionic & Covalent Bonds
Topic: Electron Affinity vs. Ionization Energy [ENDORSED]
Replies: 4
Views: 61

Electron Affinity vs. Ionization Energy [ENDORSED]

Is electron affinity and ionization directly related or are they the same thing? If they are related, is there any equation which relates the two?
by Raphael_SanAndres3C
Sat Oct 27, 2018 8:06 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Indeterminacy Question
Replies: 2
Views: 98

Indeterminacy Question

If I have an indeterminacy of delta x, does that mean that any x that I get will be in the range +- delta x or +- delta x/2?
by Raphael_SanAndres3C
Sun Oct 21, 2018 5:49 pm
Forum: Properties of Electrons
Topic: Test question
Replies: 6
Views: 216

Re: Test question

I don't think we need to know anything that wasn't covered in lecture.
by Raphael_SanAndres3C
Sun Oct 21, 2018 5:46 pm
Forum: Quantum Numbers and The H-Atom
Topic: Principle Quantum #
Replies: 5
Views: 157

Re: Principle Quantum #

http://quantumnumbers.weebly.com/uploads/1/2/2/1/12213482/794280614.jpg

The Principal Quantum numbers signify the orbital in which the electron is in and thus the energy level of the electron.
by Raphael_SanAndres3C
Sun Oct 21, 2018 5:43 pm
Forum: *Shrodinger Equation
Topic: Use of Schrodinger equation
Replies: 3
Views: 112

Re: Use of Schrodinger equation

Lavelle mentioned that the calculations for the Schrodinger Equation was not necessary for the test but the fundamental concepts would be tested.
by Raphael_SanAndres3C
Thu Oct 11, 2018 1:54 pm
Forum: General Science Questions
Topic: Khan Academy
Replies: 10
Views: 337

Khan Academy

I have been looking for other ways to review. Has anyone tried to study via Khan Academy and if so, has the review with Khan Academy more or less helpful than reviewing lecture notes and the book?
by Raphael_SanAndres3C
Thu Oct 11, 2018 1:46 pm
Forum: Administrative Questions and Class Announcements
Topic: So can we do problems from Review of Chemistry for week 2 homework?
Replies: 4
Views: 80

Re: So can we do problems from Review of Chemistry for week 2 homework?

Some people have already had their TA Discussion section which is why there are already questions about it. I don't think its needed to do the week 2 questions for your week 1 homework, its just that people have already started next week's homework. As far as I understand, any 7 questions that were ...
by Raphael_SanAndres3C
Thu Oct 11, 2018 1:43 pm
Forum: Student Social/Study Group
Topic: Studying techniques
Replies: 12
Views: 254

Re: Studying techniques

I have been doing the last few problems for each section and trying to solve it over and over again until I completely understand it. Its been helping with the conceptual side of chemistry.
by Raphael_SanAndres3C
Thu Oct 04, 2018 9:11 pm
Forum: Empirical & Molecular Formulas
Topic: Question M.19 (Sixth Edition)
Replies: 2
Views: 117

Re: Question M.19 (Sixth Edition)

To start, you have to convert CO2, H2O, and N2 into mols using their molar mass and the grams given to you for each substance (.682g for CO2, .174g for H2O, and .110g for N2). The 194 g.mol^-1 for caffeine isn't important until later when you need to calculate the molecular formula from the empirica...
by Raphael_SanAndres3C
Thu Oct 04, 2018 9:04 pm
Forum: SI Units, Unit Conversions
Topic: Scientific Notation
Replies: 11
Views: 223

Re: Scientific Notation

I believe that scientific notation is usually used if it is smaller the quantity uses 10^-2 or smaller or 10^2 or bigger.
by Raphael_SanAndres3C
Thu Oct 04, 2018 8:56 pm
Forum: SI Units, Unit Conversions
Topic: L35 Tons Conversion Rate
Replies: 4
Views: 94

L35 Tons Conversion Rate

Sodium bromide, NaBr, which is used to produce AgBr for use in photographic film, can itself be prepared as follows. Fe + Br2 -> FeBr2 FeBr2 + Br2 -> Fe3Br8 Fe3Br8 + Na2CO3 -> NaBr + CO2 + Fe3O4 What mass of iron, in kilograms, is needed to produce 2.50 t of NaBr? Note that these equations must firs...

Go to advanced search