Search found 30 matches
- Tue Jun 12, 2018 2:25 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Name of Molecule
- Replies: 4
- Views: 510
Re: Name of Molecule
I'm pretty sure you are never supposed to ignore the lone pairs when naming a molecule.
- Tue Jun 12, 2018 2:21 am
- Forum: General Science Questions
- Topic: Sig Figs
- Replies: 9
- Views: 1767
Re: Sig Figs
When in the middle of the problem, you should keep as many decimal places as possible, so that there is no rounding error. I usually keep 3 or 4 more decimals than I will need for my answer, just to be safe.
- Tue Jun 12, 2018 2:19 am
- Forum: Lewis Acids & Bases
- Topic: BaO [ENDORSED]
- Replies: 1
- Views: 400
Re: BaO [ENDORSED]
It's basic because when it dissolves in H2O, One of the H and the O from the water is used to form Ba(OH)2
- Sat Jun 02, 2018 11:31 pm
- Forum: Hybridization
- Topic: Hybrid Orbitals and lone pairs
- Replies: 2
- Views: 360
Re: Hybrid Orbitals and lone pairs
A lone pair takes up one of the hybridized orbitals. For example, h2o is sp3 hybridized with a lone pair in one of its orbitals.
- Sat Jun 02, 2018 11:25 pm
- Forum: Hybridization
- Topic: Filling Orbitals for Hybridization
- Replies: 1
- Views: 244
Re: Filling Orbitals for Hybridization
Basically, you count the amount of arrows (electrons) in the outer s and p orbitals and then divy them out to a new sp3 hybridization. So if you have an s with a full orbital (2 arrows) and a p with 2 arrows, it becomes four arrows pointing upwards (not one paired in a box with 2 up and an empty box.)
- Sat Jun 02, 2018 11:20 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Final
- Replies: 5
- Views: 594
Re: Final
Professor Lavelle told us in class to skip the part of #29 that requires naming the compound.
- Fri May 25, 2018 5:59 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing power
- Replies: 10
- Views: 8764
Re: Polarizing power
One way to think of it is that cations have different polarizing power while anions have different polarizabilities.
- Fri May 25, 2018 5:54 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angle
- Replies: 6
- Views: 647
Re: Bond Angle
Will we have to memorize all the bond angles for the final?
- Fri May 25, 2018 5:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR
- Replies: 3
- Views: 385
VSEPR
Does the type of bond (single, double, triple) affect the VSEPR formula? Like is it AX2 if there is a double bond or is it still just AX?
- Sat May 19, 2018 1:12 pm
- Forum: Resonance Structures
- Topic: Resonance Structures [ENDORSED]
- Replies: 4
- Views: 577
Re: Resonance Structures [ENDORSED]
An easy way to figure out all the resonance structures is just be “spinning” the bonded atoms around the center atom until it is back in its original position.
- Fri May 18, 2018 2:37 pm
- Forum: Lewis Structures
- Topic: 3.41c
- Replies: 2
- Views: 376
Re: 3.41c
Do you think we’ll have to be able to know how to do this for a compound this complicated for the rest of this class?
- Mon May 14, 2018 2:42 pm
- Forum: Ionic & Covalent Bonds
- Topic: Electronegativity
- Replies: 5
- Views: 745
Electronegativity
When electronegativity > 2, then it’s an ionic bond and when electronegativity < 1.5, then it’s a covalent bond. But what happens when electronegativity is between 1.5 and 2?
- Fri May 11, 2018 2:49 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Midterm Question
- Replies: 13
- Views: 1429
Re: Midterm Question
The amount of ml values is always 1 for s, 3 for p, 5 for d, and 7 for f
- Fri May 11, 2018 2:47 pm
- Forum: Lewis Structures
- Topic: SO2
- Replies: 5
- Views: 835
Re: SO2
If you’re confused, just remember to prioritize having smaller formal charges and then worry about abiding by the octet rule.
- Fri May 11, 2018 2:44 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge: Lewis dot structures
- Replies: 6
- Views: 988
Re: Formal Charge: Lewis dot structures
Ideally, all your formal charges would be between -1 and 1, and you should change the structure to allow for the maximum amount of FC=0 as possible.
- Tue May 01, 2018 1:43 am
- Forum: Quantum Numbers and The H-Atom
- Topic: Magnetic Quantum Number
- Replies: 2
- Views: 431
Magnetic Quantum Number
How do you figure out Ml?
Not just the range but the actual value.
Not just the range but the actual value.
- Tue May 01, 2018 12:45 am
- Forum: Ionic & Covalent Bonds
- Topic: Midterm Topics [ENDORSED]
- Replies: 33
- Views: 4971
Midterm Topics [ENDORSED]
Will we need to know anything from outline 3 for the midterm?
- Mon Apr 30, 2018 2:09 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Ground State [ENDORSED]
- Replies: 1
- Views: 256
Re: Ground State [ENDORSED]
It means that the electron is in the lowest possible energy level.
- Wed Apr 25, 2018 2:21 pm
- Forum: Einstein Equation
- Topic: converting from keV to joules
- Replies: 7
- Views: 891
Re: converting from keV to joules
All important conversion rates are given on the test.
- Wed Apr 25, 2018 2:05 pm
- Forum: DeBroglie Equation
- Topic: Ek= 0 [ENDORSED]
- Replies: 3
- Views: 542
Re: Ek= 0 [ENDORSED]
When you are trying to find the maximum wavelength (or minimum frequency) for an electron to be ejected, the KE = 0.
- Wed Apr 25, 2018 2:03 pm
- Forum: Limiting Reactant Calculations
- Topic: Mass of Reactant/Product
- Replies: 4
- Views: 929
Re: Mass of Reactant/Product
No, according to the law of conservation of mass, the total mass of the reactants has to be equal to the total mass of the products.
- Wed Apr 18, 2018 2:10 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: h-bar [ENDORSED]
- Replies: 7
- Views: 1373
Re: h-bar [ENDORSED]
Will we need to memorize the value of h-bar on the test next week?
- Wed Apr 18, 2018 2:08 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test Number 1
- Replies: 10
- Views: 1271
Test Number 1
Does anybody know the average score on the first test?
- Wed Apr 18, 2018 2:05 pm
- Forum: Properties of Light
- Topic: The speed of light
- Replies: 4
- Views: 455
Re: The speed of light
"In a vacuum" means that there is no matter in the space that would affect processes occurring there.
- Wed Apr 11, 2018 2:14 pm
- Forum: Properties of Light
- Topic: Light Spectrum
- Replies: 2
- Views: 429
Light Spectrum
Will we have to know the specific wavelength in nm for each color on the visible spectrum?
- Wed Apr 11, 2018 2:09 pm
- Forum: Properties of Light
- Topic: Value of Speed of Light** (Shoutout to Dr. Lavelle for calling me out in lecture today) [ENDORSED]
- Replies: 4
- Views: 582
Re: Value of Speed of Life [ENDORSED]
You could use 2.99 but it's just easier to use 3.00 because it's simpler
- Wed Apr 11, 2018 3:20 am
- Forum: Properties of Light
- Topic: Homework? [ENDORSED]
- Replies: 10
- Views: 1098
Re: Homework? [ENDORSED]
It also depends on your TA. Mine emailed us saying that we should only do problems from outline 1 since we hadn't covered outline 2 yet.
- Mon Apr 09, 2018 12:24 pm
- Forum: Significant Figures
- Topic: Sig fig simple question [ENDORSED]
- Replies: 5
- Views: 652
Sig fig simple question [ENDORSED]
Is this a correct use of sig figs?
1 x 0.9342769 = 0.9
You are supposed to keep the lowest number of sig figs from your problem, and since "1" has just 1 sig fig, you keep only the 0.9 right?
1 x 0.9342769 = 0.9
You are supposed to keep the lowest number of sig figs from your problem, and since "1" has just 1 sig fig, you keep only the 0.9 right?
- Mon Apr 09, 2018 12:21 pm
- Forum: Significant Figures
- Topic: Sig Figs [ENDORSED]
- Replies: 2
- Views: 340
Re: Sig Figs [ENDORSED]
For this test, Dr. Lavelle said we won't be penalized for incorrect number of sig figs
- Mon Apr 09, 2018 12:20 pm
- Forum: Significant Figures
- Topic: Basic Sig Figs
- Replies: 13
- Views: 1992
Re: Basic Sig Figs
I know that we don't need to worry about sig figs for this week's test, but do you all think we will need them for the next test?