Search found 30 matches

by Jacob Samuels 1E
Tue Jun 12, 2018 2:25 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Name of Molecule
Replies: 4
Views: 190

Re: Name of Molecule

I'm pretty sure you are never supposed to ignore the lone pairs when naming a molecule.
by Jacob Samuels 1E
Tue Jun 12, 2018 2:21 am
Forum: General Science Questions
Topic: Sig Figs
Replies: 9
Views: 874

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.
by Jacob Samuels 1E
Tue Jun 12, 2018 2:19 am
Forum: Lewis Acids & Bases
Topic: BaO [ENDORSED]
Replies: 1
Views: 189

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
by Jacob Samuels 1E
Sat Jun 02, 2018 11:31 pm
Forum: Hybridization
Topic: Hybrid Orbitals and lone pairs
Replies: 2
Views: 95

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.
by Jacob Samuels 1E
Sat Jun 02, 2018 11:25 pm
Forum: Hybridization
Topic: Filling Orbitals for Hybridization
Replies: 1
Views: 60

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.)
by Jacob Samuels 1E
Sat Jun 02, 2018 11:20 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Final
Replies: 5
Views: 197

Re: Final

Professor Lavelle told us in class to skip the part of #29 that requires naming the compound.
by Jacob Samuels 1E
Fri May 25, 2018 5:59 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing power
Replies: 10
Views: 544

Re: Polarizing power

One way to think of it is that cations have different polarizing power while anions have different polarizabilities.
by Jacob Samuels 1E
Fri May 25, 2018 5:54 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle
Replies: 6
Views: 208

Re: Bond Angle

Will we have to memorize all the bond angles for the final?
by Jacob Samuels 1E
Fri May 25, 2018 5:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 3
Views: 129

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?
by Jacob Samuels 1E
Sat May 19, 2018 1:12 pm
Forum: Resonance Structures
Topic: Resonance Structures [ENDORSED]
Replies: 4
Views: 189

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.
by Jacob Samuels 1E
Fri May 18, 2018 2:37 pm
Forum: Lewis Structures
Topic: 3.41c
Replies: 2
Views: 110

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?
by Jacob Samuels 1E
Mon May 14, 2018 2:42 pm
Forum: Ionic & Covalent Bonds
Topic: Electronegativity
Replies: 5
Views: 204

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?
by Jacob Samuels 1E
Fri May 11, 2018 2:49 pm
Forum: Quantum Numbers and The H-Atom
Topic: Midterm Question
Replies: 13
Views: 478

Re: Midterm Question

The amount of ml values is always 1 for s, 3 for p, 5 for d, and 7 for f
by Jacob Samuels 1E
Fri May 11, 2018 2:47 pm
Forum: Lewis Structures
Topic: SO2
Replies: 5
Views: 329

Re: SO2

If you’re confused, just remember to prioritize having smaller formal charges and then worry about abiding by the octet rule.
by Jacob Samuels 1E
Fri May 11, 2018 2:44 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge: Lewis dot structures
Replies: 6
Views: 242

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.
by Jacob Samuels 1E
Tue May 01, 2018 1:43 am
Forum: Quantum Numbers and The H-Atom
Topic: Magnetic Quantum Number
Replies: 2
Views: 178

Magnetic Quantum Number

How do you figure out Ml?

Not just the range but the actual value.
by Jacob Samuels 1E
Tue May 01, 2018 12:45 am
Forum: Ionic & Covalent Bonds
Topic: Midterm Topics [ENDORSED]
Replies: 33
Views: 1911

Midterm Topics [ENDORSED]

Will we need to know anything from outline 3 for the midterm?
by Jacob Samuels 1E
Mon Apr 30, 2018 2:09 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ground State [ENDORSED]
Replies: 1
Views: 69

Re: Ground State [ENDORSED]

It means that the electron is in the lowest possible energy level.
by Jacob Samuels 1E
Wed Apr 25, 2018 2:21 pm
Forum: Einstein Equation
Topic: converting from keV to joules
Replies: 7
Views: 289

Re: converting from keV to joules

All important conversion rates are given on the test.
by Jacob Samuels 1E
Wed Apr 25, 2018 2:05 pm
Forum: DeBroglie Equation
Topic: Ek= 0 [ENDORSED]
Replies: 3
Views: 182

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.
by Jacob Samuels 1E
Wed Apr 25, 2018 2:03 pm
Forum: Limiting Reactant Calculations
Topic: Mass of Reactant/Product
Replies: 4
Views: 312

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.
by Jacob Samuels 1E
Wed Apr 18, 2018 2:10 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: h-bar [ENDORSED]
Replies: 7
Views: 268

Re: h-bar [ENDORSED]

Will we need to memorize the value of h-bar on the test next week?
by Jacob Samuels 1E
Wed Apr 18, 2018 2:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Test Number 1
Replies: 10
Views: 457

Test Number 1

Does anybody know the average score on the first test?
by Jacob Samuels 1E
Wed Apr 18, 2018 2:05 pm
Forum: Properties of Light
Topic: The speed of light
Replies: 4
Views: 143

Re: The speed of light

"In a vacuum" means that there is no matter in the space that would affect processes occurring there.
by Jacob Samuels 1E
Wed Apr 11, 2018 2:14 pm
Forum: Properties of Light
Topic: Light Spectrum
Replies: 2
Views: 171

Light Spectrum

Will we have to know the specific wavelength in nm for each color on the visible spectrum?
by Jacob Samuels 1E
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: 184

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
by Jacob Samuels 1E
Wed Apr 11, 2018 3:20 am
Forum: Properties of Light
Topic: Homework? [ENDORSED]
Replies: 10
Views: 370

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.
by Jacob Samuels 1E
Mon Apr 09, 2018 12:24 pm
Forum: Significant Figures
Topic: Sig fig simple question [ENDORSED]
Replies: 5
Views: 237

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?
by Jacob Samuels 1E
Mon Apr 09, 2018 12:21 pm
Forum: Significant Figures
Topic: Sig Figs [ENDORSED]
Replies: 2
Views: 137

Re: Sig Figs [ENDORSED]

For this test, Dr. Lavelle said we won't be penalized for incorrect number of sig figs
by Jacob Samuels 1E
Mon Apr 09, 2018 12:20 pm
Forum: Significant Figures
Topic: Basic Sig Figs
Replies: 13
Views: 988

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?

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