Search found 18 matches
- Sun Dec 10, 2017 12:33 am
- Forum: Resonance Structures
- Topic: Delocalization in Resonance Structures
- Replies: 2
- Views: 353
Re: Delocalization in Resonance Structures
Yep, since delocalization is contingent on the bonds not being fixed in their places--meaning resonance!
- Sun Dec 10, 2017 12:04 am
- Forum: Photoelectric Effect
- Topic: Test 2, #7a
- Replies: 2
- Views: 316
Re: Test 2, #7a
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...
- Sat Dec 09, 2017 8:34 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Strong acids and base vs weak acids and base
- Replies: 1
- Views: 203
Re: Strong acids and base vs weak acids and base
There are only a few strong acids/bases, so you pretty much just have to memorize them. The rest are weak acids/bases.
- Sat Dec 09, 2017 8:24 pm
- Forum: Einstein Equation
- Topic: Test 2 #5
- Replies: 3
- Views: 345
Re: Test 2 #5
Your delta E should be 1.937x10^-18, maybe that's what's messing up your answer?
- Sat Dec 09, 2017 7:52 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Pressure and Volume
- Replies: 2
- Views: 330
Re: Pressure and Volume
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
decrease in volume means an increase in pressure so the reaction is shifted to the side w/fewer moles
- Sat Dec 09, 2017 7:50 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Polydentates Ligands
- Replies: 2
- Views: 386
Re: Polydentates Ligands
polydentate means that there are multiple bonding sites on the central atom
- Mon Nov 27, 2017 12:01 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: test 4 question
- Replies: 3
- Views: 310
Re: test 4 question
Yep, I think it's safe to assume it will be covered. Since test 4 will be from 11.1-11.8.
- Sun Nov 26, 2017 11:57 pm
- Forum: Biological Examples
- Topic: Memorization of compounds
- Replies: 5
- Views: 617
Re: Memorization of compounds
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.
- Sun Nov 12, 2017 9:29 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 4.5
- Replies: 2
- Views: 237
Re: 4.5
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.
- Sun Nov 12, 2017 9:21 pm
- Forum: Dipole Moments
- Topic: Dipole // Molecular Shape and Bond Polarity
- Replies: 2
- Views: 216
Re: Dipole // Molecular Shape and Bond Polarity
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 ...
- Sun Nov 05, 2017 4:43 pm
- Forum: Lewis Structures
- Topic: HW: 3.33 part B
- Replies: 1
- Views: 125
HW: 3.33 part B
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.
- Sun Nov 05, 2017 4:38 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: trigonal pyramidal
- Replies: 3
- Views: 311
Re: trigonal pyramidal
Even if there are three bonds and no lone pair, it is still considered trigonal pyramidal, when we are talking about molecular geometry.
- Sun Oct 22, 2017 8:37 pm
- Forum: Photoelectric Effect
- Topic: Work Function [ENDORSED]
- Replies: 5
- Views: 454
Re: Work Function [ENDORSED]
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.
- Sun Oct 22, 2017 8:33 pm
- Forum: Properties of Light
- Topic: Heisenberg's indeterminacy principle
- Replies: 2
- Views: 274
Re: Heisenberg's indeterminacy principle
I'm pretty sure the h is planck's constant!
h: 6.626x10^-34 Joules x seconds
h: 6.626x10^-34 Joules x seconds
- Sun Oct 15, 2017 10:49 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric effect [ENDORSED]
- Replies: 4
- Views: 363
Re: Photoelectric effect [ENDORSED]
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.
- Sun Oct 15, 2017 10:37 pm
- Forum: Properties of Light
- Topic: Fig. 1.7 [ENDORSED]
- Replies: 1
- Views: 224
Re: Fig. 1.7 [ENDORSED]
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.
- Sat Oct 07, 2017 4:17 pm
- Forum: Limiting Reactant Calculations
- Topic: Theoretical Yield [ENDORSED]
- Replies: 6
- Views: 522
Re: Theoretical Yield [ENDORSED]
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...
- Sat Oct 07, 2017 3:49 pm
- Forum: Empirical & Molecular Formulas
- Topic: Getting molecular formula from molecule name [ENDORSED]
- Replies: 3
- Views: 405
Re: Getting molecular formula from molecule name [ENDORSED]
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.