Search found 36 matches
- Wed Dec 04, 2019 8:09 pm
- Forum: Hybridization
- Topic: sp3d and onward
- Replies: 3
- Views: 275
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
- Wed Dec 04, 2019 8:08 pm
- Forum: Polyprotic Acids & Bases
- Topic: Ka value
- Replies: 5
- Views: 463
Re: Ka value
yeah as a molecule gains electrons, it becomes hard for the molecule to gain more, making the kA lower
- 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: 456
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
- Wed Dec 04, 2019 8:06 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Application of oxidation number
- Replies: 3
- Views: 444
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?
- Wed Dec 04, 2019 8:05 pm
- Forum: Bronsted Acids & Bases
- Topic: HF is a weak acid?
- Replies: 8
- Views: 1187
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)
- Wed Dec 04, 2019 8:04 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent vs linear
- Replies: 56
- Views: 4313
Re: Bent vs linear
linear: 2 regions of electron density, 2 bonds
bent: 4 regions of electron density, 2 bonds
bent: 4 regions of electron density, 2 bonds
- Wed Dec 04, 2019 8:03 pm
- Forum: General Science Questions
- Topic: Review in General
- Replies: 4
- Views: 387
Re: Review in General
kahn acadmey, and as many practice problems from the textbook i can possibly do
- Wed Dec 04, 2019 8:02 pm
- Forum: DeBroglie Equation
- Topic: De Broglie Wavelength
- Replies: 23
- Views: 3451
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
- Wed Dec 04, 2019 8:01 pm
- Forum: Student Social/Study Group
- Topic: Grades
- Replies: 14
- Views: 1009
Re: Grades
yeah i dont think he curves tests but curves the final grades
- Wed Dec 04, 2019 8:00 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: 6C.21b
- Replies: 3
- Views: 440
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."
- Wed Dec 04, 2019 7:59 pm
- Forum: Hybridization
- Topic: Hybridization General Question
- Replies: 3
- Views: 315
Re: Hybridization General Question
do we need to put the energy level into our answers when we write down hybridized orbitals?
- Wed Dec 04, 2019 7:58 pm
- Forum: Hybridization
- Topic: 2.45 Hybridization
- Replies: 3
- Views: 340
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
- Wed Dec 04, 2019 7:56 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T-shape
- Replies: 21
- Views: 1734
Re: T-shape
5 regions of electron density: 3 bonded, 2 lone pairs
- Wed Dec 04, 2019 7:54 pm
- Forum: Balancing Chemical Reactions
- Topic: Delta Over Reaction Arrow
- Replies: 2
- Views: 1142
Re: Delta Over Reaction Arrow
it means that energy in the form of heat is input into the reaction to make it occur (endothermic)
- Wed Dec 04, 2019 7:53 pm
- Forum: Bond Lengths & Energies
- Topic: 2D. 19
- Replies: 4
- Views: 484
Re: 2D. 19
yeah i dont think were expected to know how to calculate exact bond length for any tests in this course
- Wed Dec 04, 2019 7:52 pm
- Forum: Hybridization
- Topic: hybridization
- Replies: 3
- Views: 271
Re: hybridization
hybridization works when an atom is bonded to another atom that has electrons that exist within a different electron energy level
- Wed Dec 04, 2019 7:51 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis Structure of CH3S-
- Replies: 2
- Views: 876
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.
- Tue Dec 03, 2019 10:00 am
- Forum: Identifying Acidic & Basic Salts
- Topic: 6D11
- Replies: 2
- Views: 263
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...
- 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: 234
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...
- 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: 220
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.
- Mon Nov 04, 2019 10:46 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg Indeterminacy Equation
- Replies: 6
- Views: 533
Re: Heisenberg Indeterminacy Equation
Can someone run through what each part of the equation is? I am super super lost on this concept
- Mon Nov 04, 2019 10:29 am
- Forum: Ionic & Covalent Bonds
- Topic: Electron Configuration
- Replies: 2
- Views: 269
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...
- Mon Nov 04, 2019 10:28 am
- Forum: Ionic & Covalent Bonds
- Topic: Electron Configuration
- Replies: 2
- Views: 165
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...
- Mon Nov 04, 2019 10:20 am
- Forum: Administrative Questions and Class Announcements
- Topic: 10/28 Updates due to Fire [ENDORSED]
- Replies: 14
- Views: 1923
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
- Sun Oct 13, 2019 11:35 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Atomic Spectra!!
- Replies: 2
- Views: 100
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
- Sun Oct 13, 2019 9:47 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation [ENDORSED]
- Replies: 73
- Views: 9185
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.
- Sun Oct 13, 2019 9:45 pm
- Forum: Limiting Reactant Calculations
- Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
- Replies: 68
- Views: 7107
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...
- Sun Oct 13, 2019 9:44 pm
- Forum: Properties of Light
- Topic: Week 3 Homework Topics
- Replies: 2
- Views: 94
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?
- Sun Oct 13, 2019 9:42 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Test 1 [ENDORSED]
- Replies: 107
- Views: 23303
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.
- Sun Oct 13, 2019 9:41 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Test 1 [ENDORSED]
- Replies: 107
- Views: 23303
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...
- Sun Oct 06, 2019 11:18 am
- Forum: Molarity, Solutions, Dilutions
- Topic: Homework Question H11
- Replies: 3
- Views: 171
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.
- Sun Oct 06, 2019 11:14 am
- Forum: Empirical & Molecular Formulas
- Topic: Empirical to Molecular Formulas [ENDORSED]
- Replies: 6
- Views: 457
Empirical to Molecular Formulas [ENDORSED]
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?
- 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: 2987
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
- 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: 2987
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
- Sun Oct 06, 2019 11:11 am
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant Tips
- Replies: 4
- Views: 375
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.
- Sun Oct 06, 2019 11:07 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Uncertainty in Speed [ENDORSED]
- Replies: 31
- Views: 17615
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!