Search found 18 matches

by Christietan3F
Sun Dec 10, 2017 12:33 am
Forum: Resonance Structures
Topic: Delocalization in Resonance Structures
Replies: 2
Views: 276

Re: Delocalization in Resonance Structures

Yep, since delocalization is contingent on the bonds not being fixed in their places--meaning resonance!
by Christietan3F
Sun Dec 10, 2017 12:04 am
Forum: Photoelectric Effect
Topic: Test 2, #7a
Replies: 2
Views: 244

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...
by Christietan3F
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: 168

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.
by Christietan3F
Sat Dec 09, 2017 8:24 pm
Forum: Einstein Equation
Topic: Test 2 #5
Replies: 3
Views: 288

Re: Test 2 #5

Your delta E should be 1.937x10^-18, maybe that's what's messing up your answer?
by Christietan3F
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: 265

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
by Christietan3F
Sat Dec 09, 2017 7:50 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Polydentates Ligands
Replies: 2
Views: 309

Re: Polydentates Ligands

polydentate means that there are multiple bonding sites on the central atom
by Christietan3F
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: 291

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.
by Christietan3F
Sun Nov 26, 2017 11:57 pm
Forum: Biological Examples
Topic: Memorization of compounds
Replies: 5
Views: 480

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.
by Christietan3F
Sun Nov 12, 2017 9:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.5
Replies: 2
Views: 218

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.
by Christietan3F
Sun Nov 12, 2017 9:21 pm
Forum: Dipole Moments
Topic: Dipole // Molecular Shape and Bond Polarity
Replies: 2
Views: 185

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 ...
by Christietan3F
Sun Nov 05, 2017 4:43 pm
Forum: Lewis Structures
Topic: HW: 3.33 part B
Replies: 1
Views: 114

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.
by Christietan3F
Sun Nov 05, 2017 4:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: trigonal pyramidal
Replies: 3
Views: 225

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.
by Christietan3F
Sun Oct 22, 2017 8:37 pm
Forum: Photoelectric Effect
Topic: Work Function [ENDORSED]
Replies: 5
Views: 349

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.
by Christietan3F
Sun Oct 22, 2017 8:33 pm
Forum: Properties of Light
Topic: Heisenberg's indeterminacy principle
Replies: 2
Views: 223

Re: Heisenberg's indeterminacy principle

I'm pretty sure the h is planck's constant!
h: 6.626x10^-34 Joules x seconds
by Christietan3F
Sun Oct 15, 2017 10:49 pm
Forum: Photoelectric Effect
Topic: Photoelectric effect [ENDORSED]
Replies: 4
Views: 284

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.
by Christietan3F
Sun Oct 15, 2017 10:37 pm
Forum: Properties of Light
Topic: Fig. 1.7 [ENDORSED]
Replies: 1
Views: 176

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.
by Christietan3F
Sat Oct 07, 2017 4:17 pm
Forum: Limiting Reactant Calculations
Topic: Theoretical Yield [ENDORSED]
Replies: 6
Views: 466

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...
by Christietan3F
Sat Oct 07, 2017 3:49 pm
Forum: Empirical & Molecular Formulas
Topic: Getting molecular formula from molecule name [ENDORSED]
Replies: 3
Views: 318

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.

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