Search found 36 matches

by Sears 4A
Wed Dec 04, 2019 8:09 pm
Forum: Hybridization
Topic: sp3d and onward
Replies: 3
Views: 32

Re: sp3d and onward

most of the molecules we have been and will deal with will be sp3d and so on; its unlikely there will ever be a sp2d
by Sears 4A
Wed Dec 04, 2019 8:08 pm
Forum: Polyprotic Acids & Bases
Topic: Ka value
Replies: 5
Views: 39

Re: Ka value

yeah as a molecule gains electrons, it becomes hard for the molecule to gain more, making the kA lower
by Sears 4A
Wed Dec 04, 2019 8:07 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: How does anion stability contribute to relative acidity?
Replies: 6
Views: 38

Re: How does anion stability contribute to relative acidity?

the more stable the anion on its own, the more likely the acid is to be strong because it is more likely to dissociate in water
by Sears 4A
Wed Dec 04, 2019 8:06 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Application of oxidation number
Replies: 3
Views: 39

Re: Application of oxidation number

can someone quickly summarize how you find the oxidation number of an atom? is it the same as formal charge?
by Sears 4A
Wed Dec 04, 2019 8:05 pm
Forum: Bronsted Acids & Bases
Topic: HF is a weak acid?
Replies: 8
Views: 59

Re: HF is a weak acid?

stronger bonds between atoms mean it is more difficult for that molecule to dissociate fully (which is the definition of a strong acid)
by Sears 4A
Wed Dec 04, 2019 8:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs linear
Replies: 56
Views: 288

Re: Bent vs linear

linear: 2 regions of electron density, 2 bonds
bent: 4 regions of electron density, 2 bonds
by Sears 4A
Wed Dec 04, 2019 8:03 pm
Forum: General Science Questions
Topic: Review in General
Replies: 4
Views: 42

Re: Review in General

kahn acadmey, and as many practice problems from the textbook i can possibly do
by Sears 4A
Wed Dec 04, 2019 8:02 pm
Forum: DeBroglie Equation
Topic: De Broglie Wavelength
Replies: 23
Views: 1196

Re: De Broglie Wavelength

you can use de Broglie for something other than an electron (its anything that has mass), but i think were mostly expected to use it for electrons. im pretty sure the problem would clearly state the mass of another particle if they expected us to do that
by Sears 4A
Wed Dec 04, 2019 8:01 pm
Forum: Student Social/Study Group
Topic: Grades
Replies: 14
Views: 152

Re: Grades

yeah i dont think he curves tests but curves the final grades
by Sears 4A
Wed Dec 04, 2019 8:00 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: 6C.21b
Replies: 3
Views: 30

Re: 6C.21b

"Out of acetic acid and formic acid, formic acid is considered stronger because the CH3 in acetic acid is electron donating. The CH3 actually contributes electron density towards the O-H bond, making it harder to remove the H, and making acetic acid a weaker acid than formic acid."
by Sears 4A
Wed Dec 04, 2019 7:59 pm
Forum: Hybridization
Topic: Hybridization General Question
Replies: 3
Views: 35

Re: Hybridization General Question

do we need to put the energy level into our answers when we write down hybridized orbitals?
by Sears 4A
Wed Dec 04, 2019 7:58 pm
Forum: Hybridization
Topic: 2.45 Hybridization
Replies: 3
Views: 25

Re: 2.45 Hybridization

however many regions of electron density an atom has, it will have exactly that many hybrid orbitals, even if they are lone pairs
by Sears 4A
Wed Dec 04, 2019 7:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T-shape
Replies: 21
Views: 99

Re: T-shape

5 regions of electron density: 3 bonded, 2 lone pairs
by Sears 4A
Wed Dec 04, 2019 7:54 pm
Forum: Balancing Chemical Reactions
Topic: Delta Over Reaction Arrow
Replies: 1
Views: 27

Re: Delta Over Reaction Arrow

it means that energy in the form of heat is input into the reaction to make it occur (endothermic)
by Sears 4A
Wed Dec 04, 2019 7:53 pm
Forum: Bond Lengths & Energies
Topic: 2D. 19
Replies: 3
Views: 43

Re: 2D. 19

yeah i dont think were expected to know how to calculate exact bond length for any tests in this course
by Sears 4A
Wed Dec 04, 2019 7:52 pm
Forum: Hybridization
Topic: hybridization
Replies: 3
Views: 22

Re: hybridization

hybridization works when an atom is bonded to another atom that has electrons that exist within a different electron energy level
by Sears 4A
Wed Dec 04, 2019 7:51 pm
Forum: Lewis Acids & Bases
Topic: Lewis Structure of CH3S-
Replies: 2
Views: 19

Re: Lewis Structure of CH3S-

I agree, I believe it would be a Lewis base because of the lone pairs on the sulfur --> working as an electron donor.
by Sears 4A
Tue Dec 03, 2019 10:00 am
Forum: Identifying Acidic & Basic Salts
Topic: 6D11
Replies: 2
Views: 40

Re: 6D11

I don't think you need to find the exact pH, I think the question is more about analyzing whether or not these salts would dissolve in water and make the solution acidic (pH<7) or basic (pH>7). You'd have to analyze how the dissociated salt would interact with water and whether or not it would creat...
by Sears 4A
Mon Nov 18, 2019 11:24 am
Forum: Determining Molecular Shape (VSEPR)
Topic: What are the names of the geometries that we must know? [ENDORSED]
Replies: 3
Views: 37

Re: What are the names of the geometries that we must know? [ENDORSED]

I'm pretty sure the following shapes are the ones we need to know: linear trigonal planar bent tetrahedral trigonal pyramid bent trigonal bipyramid seasaw t-shape octahedral square pyramid square planar Pro-tip, if you google "VSEPR Chart" on Google Images you can find a really helpful cha...
by Sears 4A
Mon Nov 04, 2019 10:48 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Manipulating for the initial energy level
Replies: 2
Views: 36

Re: Manipulating for the initial energy level

I also find manipulating it first to be easier, but doing that you can easily mix up signs are start getting wrong numbers. If you wanna manipulate it before, just be careful with your +/- signs.
by Sears 4A
Mon Nov 04, 2019 10:46 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Indeterminacy Equation
Replies: 6
Views: 82

Re: Heisenberg Indeterminacy Equation

Can someone run through what each part of the equation is? I am super super lost on this concept
by Sears 4A
Mon Nov 04, 2019 10:29 am
Forum: Ionic & Covalent Bonds
Topic: Electron Configuration
Replies: 2
Views: 18

Electron Configuration

Can someone lay out the order in which we are supposed to fill each orbital when doing electron configurations? I know some of the energy levels do not necessarily go in the same order as you would expect (4s before 3d for example) so I am a bit confused. Are we going to be given an outline of the e...
by Sears 4A
Mon Nov 04, 2019 10:28 am
Forum: Ionic & Covalent Bonds
Topic: Electron Configuration
Replies: 2
Views: 16

Electron Configuration

Can someone lay out the order in which we are supposed to fill each orbital when doing electron configurations? I know some of the energy levels do not necessarily go in the same order as you would expect (4s before 3d for example) so I am a bit confused. Are we going to be given an outline of the e...
by Sears 4A
Mon Nov 04, 2019 10:20 am
Forum: Administrative Questions and Class Announcements
Topic: 10/28 Updates due to Fire [ENDORSED]
Replies: 14
Views: 844

Re: 10/28 Updates due to Fire [ENDORSED]

Does anyone know if there are any workshop sessions this week (week 6)? I know there were many step-up, drop-in, and workshop sessions last week but looking for one to go to this week. Thanks
by Sears 4A
Sun Oct 13, 2019 11:35 pm
Forum: Quantum Numbers and The H-Atom
Topic: Atomic Spectra!!
Replies: 2
Views: 25

Atomic Spectra!!

If we are given a wavelength of a line in a certain series of the atomic spectra, how do we go about calculating which energy levels that H atom transitioned from? I am referring problem 1.15 in section 1A of the Quantum section of the textbook
by Sears 4A
Sun Oct 13, 2019 9:47 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 73
Views: 1632

Re: Rydberg equation [ENDORSED]

KHowe_1B wrote:What exactly is the Rydberg equation and how do you know when to use it?


Dr. Lavelle said he does not expect us to memorize the Rydberg equation since it is such a shortcut, but would rather us understand the steps to how the equation was made in the first place to solve problems.
by Sears 4A
Sun Oct 13, 2019 9:45 pm
Forum: Limiting Reactant Calculations
Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Replies: 68
Views: 1601

Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]

I don't want to be that person but what does dimensional analysis mean? Dimensional analysis is the process for solving problems where you multiply out the needed ratios (mole/mole, grams/mole, grams/L) and cancel out the units in order to get the correct answer. You know which ratios you need depe...
by Sears 4A
Sun Oct 13, 2019 9:44 pm
Forum: Properties of Light
Topic: Week 3 Homework Topics
Replies: 2
Views: 13

Week 3 Homework Topics

If i have a discussion on Tuesday, am I expected to cover topics that Dr. Lavelle will be discussing later in the week in my week 3 homework, or can I focus on quantum (light properties, spectra etc.) since I have not been to a lecture for the new material yet?
by Sears 4A
Sun Oct 13, 2019 9:42 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 2778

Re: Test 1 [ENDORSED]

LeAirraBullingor3k wrote:I don't know if someone has asked this already but would we get partial credit for unfinished problems headed in the right direction?


I believe so, yes. Dr. Lavelle mentioned in lecture to always try to solve as much of the problem as possible which leads me to believe partial credit will be given.
by Sears 4A
Sun Oct 13, 2019 9:41 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 2778

Re: Test 1 [ENDORSED]

Can someone explain what Angstroms are? I was confused on the test on this question. Angstroms are a unit of length equivalent to 10^(-10) m. I was taken aback by this question on the test as I do not ever remember being told we had to memorize the quant. value of Angstroms. Did I miss that in clas...
by Sears 4A
Sun Oct 06, 2019 11:18 am
Forum: Molarity, Solutions, Dilutions
Topic: Homework Question H11
Replies: 3
Views: 56

Re: Homework Question H11

I also always start by balancing anything that is not carbon, oxygen, or hydrogen. In most equations theres is a good chance youll have some form of a hydrocarbon or oxygen or water, so by balancing other elements first you can then remedy the unbalanced elements easily with O2, H2O, etc.
by Sears 4A
Sun Oct 06, 2019 11:14 am
Forum: Empirical & Molecular Formulas
Topic: Empirical to Molecular Formulas
Replies: 2
Views: 54

Empirical to Molecular Formulas

I understand how to find empirical formulas, but am unclear on how you would transfer that into a molecular formula. What kind of further information do you need to find the true molecular formula?
by Sears 4A
Sun Oct 06, 2019 11:13 am
Forum: Empirical & Molecular Formulas
Topic: What decimal place to round to when taking masses from the Periodic Table?
Replies: 19
Views: 180

Re: What decimal place to round to when taking masses from the Periodic Table?

I usually use the entire mass given on the table, so 2 decimal places, and then follow my sig figs from there
by Sears 4A
Sun Oct 06, 2019 11:12 am
Forum: Empirical & Molecular Formulas
Topic: What decimal place to round to when taking masses from the Periodic Table?
Replies: 19
Views: 180

Re: What decimal place to round to when taking masses from the Periodic Table?

I usually use the entire mass given on the table, so 2 decimal places, and then follow my sig figs from there
by Sears 4A
Sun Oct 06, 2019 11:11 am
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant Tips
Replies: 4
Views: 46

Limiting Reactant Tips

I haven't totally gotten a grip back on how to compare reactants in order to determine which one is limiting, anyone have any tips? I understand we have to compare how many moles of each with respect to the equation, but I do not fully get how to reason through that.
by Sears 4A
Sun Oct 06, 2019 11:07 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty in Speed [ENDORSED]
Replies: 18
Views: 1167

Re: Uncertainty in Speed [ENDORSED]

I do not think we are covering this until week 2, and the week 2 homework can be from review or quantum, so maybe wait until Dr. Lavelle goes over this in lecture!

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