Search found 16 matches

by AJ Manzano 3K
Sun Nov 25, 2018 11:30 pm
Forum: Bond Lengths & Energies
Topic: Bond Length on test/exam??
Replies: 1
Views: 61

Bond Length on test/exam??

Hello, are we going to have to know how to calculate the bond length between atoms/molecules? Like I know the higher bonds are shorter but will we need to calculate a numeric value for it? If so, how would we do that? Thank you.
by AJ Manzano 3K
Wed Nov 21, 2018 11:41 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 5
Views: 51

Re: Molecular Shape

I find knowing how the actual shape looks like to be really helpful as it gives a clue onto the shape's name. For example a trigonal planar (AX3) looks like a triangle on a single plane, while a square pyramid (AX5E) looks like a pyramid with a square base if you connect the atoms (not the lone pair...
by AJ Manzano 3K
Wed Nov 21, 2018 11:27 am
Forum: Hybridization
Topic: Electron Density vs Shape?
Replies: 6
Views: 84

Re: Electron Density vs Shape?

Electron density refers to any regions that have electrons or atoms. This helps determine the overall structure. However, when identifying the molecular shape with regards to VSEPR, only the atoms are taken into account.
by AJ Manzano 3K
Thu Nov 15, 2018 12:42 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Will we have to calculate bond angles?
Replies: 8
Views: 117

Will we have to calculate bond angles?

Regarding bond angles, is that something we will ever be asked to calculate, or do we just remember them?
by AJ Manzano 3K
Thu Nov 15, 2018 12:36 am
Forum: Determining Molecular Shape (VSEPR)
Topic: What to memorize in VSEPR?
Replies: 8
Views: 139

Re: What to memorize in VSEPR?

I'm pretty sure we are going to have to know the angles as well as the name of the shapes.
The VSEPR (Valence Shell Electron Pair Repulsion) model explains the experimentally observed shape of molecules. Basically, this is how the molecule would be structured in a 3 dimensions (real life).
by AJ Manzano 3K
Mon Nov 12, 2018 2:37 pm
Forum: General Science Questions
Topic: Chemistry Community Posts
Replies: 8
Views: 322

Re: Chemistry Community Posts

I was told the TAs check every Sunday but I'm not sure
by AJ Manzano 3K
Wed Nov 07, 2018 8:36 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 vs Dipole
Replies: 1
Views: 42

Induced Dipole vs Dipole

How do we know the difference between a dipole and an induced dipole? Is it something we have to solve for ourselves in a problem, or is that something we just have remember?
by AJ Manzano 3K
Sun Nov 04, 2018 3:46 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: More exceptions for electron configurations??
Replies: 1
Views: 63

More exceptions for electron configurations??

I know Cu ([Ar] 3d^10 4s^1) and Cr ([Ar] 3d^5 4s^1) are the exceptions to the electron configuration because the 3d subshell is trying to be more stable by being half- or completely full. Because the groups (columns) indicate the number of valence electrons, would the other elements in group 6 and 1...
by AJ Manzano 3K
Sun Nov 04, 2018 3:15 pm
Forum: Quantum Numbers and The H-Atom
Topic: s,p,d,f
Replies: 8
Views: 243

Re: s,p,d,f

An empty 4s has lower energy than an empty 3d. However, when they're filled 4s has a higher energy than 3d. Hence the reason why you write 3d before 4s in the final configuration.
by AJ Manzano 3K
Sun Nov 04, 2018 2:49 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Why does PCl5 break the Octet Rule?
Replies: 8
Views: 203

Why does PCl5 break the Octet Rule?

When could the octet rule be broken? In Wednesday's lecture, Dr. Lavelle drew the Lewis structure for phosphorus pentachloride (PCl5), and 5 chlorine atoms were attached to one phosphorus. Why can Phosphorus have 5 bonds instead of 4?
by AJ Manzano 3K
Sun Oct 21, 2018 4:44 pm
Forum: Einstein Equation
Topic: The symbol v?
Replies: 16
Views: 350

Re: The symbol v?

Frequency is a curvy v (usually it’ll be italicized in print)
Velocity is a normal print v (warning: if you capitalize this one then it’ll mean volume)
by AJ Manzano 3K
Sun Oct 21, 2018 4:35 pm
Forum: Properties of Light
Topic: Intensity vs energy
Replies: 6
Views: 103

Intensity vs energy

What exactly is intensity in comparison to energy? I know it’s like making the lights brighter while the type of light stays the same. So how does it become brighter if the energy doesn’t increase? Energy is related to wavelength, but how does intensity relate?
by AJ Manzano 3K
Fri Oct 19, 2018 5:52 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electrostatic Potential Energy Example
Replies: 2
Views: 53

Re: Electrostatic Potential Energy Example

As distance between the electron (q2) and the nucleus (q1) increases, the electrostatic tension decreases. This is because the electrons closer to the nucleus (q1) will block off some of the energy from reaching the electron (q2). Dr. Lavelle likened this to standing by a fire for warmth. As you (q2...
by AJ Manzano 3K
Fri Oct 05, 2018 9:35 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: diatomic elements
Replies: 12
Views: 438

Re: diatomic elements

For me, it helps when I picture them on the periodic table because, with the exception of Hydrogen, the other six elements (C, N, O, F, Cl, Br, I) border the top right hand corner of the table next to the column of noble gases.
by AJ Manzano 3K
Fri Oct 05, 2018 9:29 am
Forum: General Science Questions
Topic: Periodic Table
Replies: 16
Views: 408

Re: Periodic Table

Use the full number given, as it typically cuts off at the thousandths place. Then round to the thousandths at the very end of your calculations.
by AJ Manzano 3K
Fri Oct 05, 2018 9:12 am
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 113
Views: 35864

Re: Rusty on High School Chem [ENDORSED]

I took chemistry in sophomore year of high school, but it was mainly a worksheet type class more based on completion than anything else, so I'm pretty rusty as well. I've attended the Peer Learning Facilities with the UAs though and that really seems to help as you can ask any questions you want and...

Go to advanced search