CHEMISTRY COMMUNITY

Jacob Samuels 1E

I'm pretty sure you are never supposed to ignore the lone pairs when naming a molecule.

Jacob Samuels 1E

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.

Jacob Samuels 1E

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

Jacob Samuels 1E

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.

Jacob Samuels 1E

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.)

Jacob Samuels 1E

Professor Lavelle told us in class to skip the part of #29 that requires naming the compound.

Jacob Samuels 1E

One way to think of it is that cations have different polarizing power while anions have different polarizabilities.

Jacob Samuels 1E

Will we have to memorize all the bond angles for the final?

Jacob Samuels 1E

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?

Jacob Samuels 1E

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.

Jacob Samuels 1E

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?

Jacob Samuels 1E

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?

Jacob Samuels 1E

The amount of ml values is always 1 for s, 3 for p, 5 for d, and 7 for f

Jacob Samuels 1E

If you’re confused, just remember to prioritize having smaller formal charges and then worry about abiding by the octet rule.

Jacob Samuels 1E

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.

Jacob Samuels 1E

How do you figure out M_l?

Not just the range but the actual value.

Jacob Samuels 1E

Will we need to know anything from outline 3 for the midterm?

Jacob Samuels 1E

It means that the electron is in the lowest possible energy level.

Jacob Samuels 1E

All important conversion rates are given on the test.

Jacob Samuels 1E

When you are trying to find the maximum wavelength (or minimum frequency) for an electron to be ejected, the KE = 0.

Jacob Samuels 1E

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.

Jacob Samuels 1E

Will we need to memorize the value of h-bar on the test next week?

Jacob Samuels 1E

Does anybody know the average score on the first test?

Jacob Samuels 1E

"In a vacuum" means that there is no matter in the space that would affect processes occurring there.

Jacob Samuels 1E

Will we have to know the specific wavelength in nm for each color on the visible spectrum?

Jacob Samuels 1E

You could use 2.99 but it's just easier to use 3.00 because it's simpler

Jacob Samuels 1E

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.

Jacob Samuels 1E

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?

Jacob Samuels 1E

For this test, Dr. Lavelle said we won't be penalized for incorrect number of sig figs

Jacob Samuels 1E

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?

CHEMISTRY COMMUNITY

Search found 30 matches

Re: Name of Molecule

Re: Sig Figs

Re: BaO [ENDORSED]

Re: Hybrid Orbitals and lone pairs

Re: Filling Orbitals for Hybridization

Re: Final

Re: Polarizing power

Re: Bond Angle

VSEPR

Re: Resonance Structures [ENDORSED]

Re: 3.41c

Electronegativity

Re: Midterm Question

Re: SO2

Re: Formal Charge: Lewis dot structures

Magnetic Quantum Number

Midterm Topics [ENDORSED]

Re: Ground State [ENDORSED]

Re: converting from keV to joules

Re: Ek= 0 [ENDORSED]

Re: Mass of Reactant/Product

Re: h-bar [ENDORSED]

Test Number 1

Re: The speed of light

Light Spectrum

Re: Value of Speed of Life [ENDORSED]

Re: Homework? [ENDORSED]

Sig fig simple question [ENDORSED]

Re: Sig Figs [ENDORSED]

Re: Basic Sig Figs