CHEMISTRY COMMUNITY

Christietan3F

Yep, since delocalization is contingent on the bonds not being fixed in their places--meaning resonance!

Christietan3F

The threshold energy is the energy needed to eject the electron. The energy of the photon must be equal to or greater than the threshold energy to eject the electron. If the energy of the photon is greater than the energy needed to eject the electron, the leftover energy becomes kinetic energy. So t...

Christietan3F

There are only a few strong acids/bases, so you pretty much just have to memorize them. The rest are weak acids/bases.

Christietan3F

Your delta E should be 1.937x10^-18, maybe that's what's messing up your answer?

Christietan3F

increase in volume means a decrease in pressure so the reaction is shifted to the side w/more moles
decrease in volume means an increase in pressure so the reaction is shifted to the side w/fewer moles

Christietan3F

polydentate means that there are multiple bonding sites on the central atom

Christietan3F

Yep, I think it's safe to assume it will be covered. Since test 4 will be from 11.1-11.8.

Christietan3F

I think it'd be best to know how to name the compounds rather than memorizing, Lavelle seems to emphasize having an understanding of how to do something so that you don't have to memorize. But some memorization can't hurt I suppose.

Christietan3F

It has more to do with electron repulsion. The extra lone pair repels the oxygens, but the oxygens also want to maintain a good distance between themselves, and so the molecular shape becomes bent.

Christietan3F

To answer your question about the shape of a molecule and the dipole moment; in class Prof. Lavelle was talking about the water molecule and how if it were linear then the dipole moments would have cancelled because they would be "facing" each other. But since the molecule is angular, the ...

Christietan3F

For this Lewis structure, I was just wondering why we put a double bond between oxygen and carbon as opposed to putting a double bond between carbon and one of the chlorine atoms.

Christietan3F

Even if there are three bonds and no lone pair, it is still considered trigonal pyramidal, when we are talking about molecular geometry.

Christietan3F

The energy of the photon has to be greater than or equal to the work function in order to remove the electron. If the energy of the photon is greater than the work function, the excess energy becomes kinetic energy.

Christietan3F

I'm pretty sure the h is planck's constant!
h: 6.626x10^-34 Joules x seconds

Christietan3F

Photons at an individual level must have enough energy to displace electrons. Increasing the intensity of the light just increases the amount of photons that are unable to displace an electron.

Christietan3F

As the wave passes, the electron energizes, causing it to jump, or, as you said, "push". However after the electron loses this energy, it is ultimately "pulled" back to equilibrium.

Christietan3F

People keep mentioning that you must use the moles form the limiting reactant, but I think it's also worth mentioning why! For a not-so-related-to-chemistry example: If I have 5 slices of bread with jam and 8 slices of bread with peanut butter (my "reactants" in this case), in reality, I w...

Christietan3F

From what I remember during lecture, someone asked if we would have to know that information prior to the test but Lavelle said no because we hadn't gone over it in class. So, I'm pretty sure we'll touch on it, but studying it independently is always an option.

CHEMISTRY COMMUNITY

Search found 18 matches

Re: Delocalization in Resonance Structures

Re: Test 2, #7a

Re: Strong acids and base vs weak acids and base

Re: Test 2 #5

Re: Pressure and Volume

Re: Polydentates Ligands

Re: test 4 question

Re: Memorization of compounds

Re: 4.5

Re: Dipole // Molecular Shape and Bond Polarity

HW: 3.33 part B

Re: trigonal pyramidal

Re: Work Function [ENDORSED]

Re: Heisenberg's indeterminacy principle

Re: Photoelectric effect [ENDORSED]

Re: Fig. 1.7 [ENDORSED]

Re: Theoretical Yield [ENDORSED]

Re: Getting molecular formula from molecule name [ENDORSED]