Search found 38 matches
- Sun Jul 28, 2019 9:13 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Geometry vs molecular shape
- Replies: 6
- Views: 979
Re: Geometry vs molecular shape
When there are no lone pairs they are the same. When there is a lone pair, the geometry takes account of only the elctron densities and the molecuar shape takes account for the lone pairs.
- Sun Jul 28, 2019 9:12 pm
- Forum: Electronegativity
- Topic: Ionic Character
- Replies: 7
- Views: 1506
Re: Ionic Character
Because Cl is affected by shielding, O is actually higher in electronegativity. Also, oxygen is considered one of the most electronegative alongside, Nitrogen and Fluorine which is why H Bonding only happens between those three elements.
- Sun Jul 28, 2019 9:09 pm
- Forum: Octet Exceptions
- Topic: Acid Even After Octet Exception
- Replies: 1
- Views: 411
Acid Even After Octet Exception
When thinking about Lewis acids, would it still be considered a Lewis Acid when it accepts an electron pair to fulfill one of the empty d-orbitals? For the elements on the third block or lower, when they accept an electron pair despite already having a full orbital is it still considered a Lewis Acid?
- Sun Jul 28, 2019 9:08 pm
- Forum: Octet Exceptions
- Topic: Lewis Acids and Bases
- Replies: 10
- Views: 1314
Re: Lewis Acids and Bases
Lewis acids accept an electron pair from lewis bases. When there is an empty orbital, most likely a lewis acid, it will accept an electron pair from a lewis base.
- Sun Jul 28, 2019 9:07 pm
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Help, confused at identifying
- Replies: 2
- Views: 461
Help, confused at identifying
I was wondering if there was a list of acids or like a way to tell if one is a base.
- Sun Jul 28, 2019 9:06 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: How to tell?
- Replies: 11
- Views: 894
How to tell?
I was wondering if there was a list of acids or like a way to tell if one is an acid.
- Sat Jul 20, 2019 5:41 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Which do you prioritize first
- Replies: 10
- Views: 1163
Re: Which do you prioritize first
Valence electrons then formal charge so that you can have a rough guideline of how to order the electrons. Once you determine the formal charges, in relation to the overall charge, you can add changes.
- Sat Jul 20, 2019 5:40 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing Power [ENDORSED]
- Replies: 8
- Views: 1228
Re: Polarizing Power [ENDORSED]
Polarizing power is how well a cation can distort the electron density/cloud of a polarizable anion.
- Sat Jul 20, 2019 5:38 pm
- Forum: Ionic & Covalent Bonds
- Topic: Inter and Intra
- Replies: 8
- Views: 2557
Re: Inter and Intra
Intermolecular forces consist of hydrogen, vander waal interactions, and dipole-dipole interactions. Intramolecular forces consist mainly of ionic and covalent bonds.
- Sat Jul 20, 2019 5:36 pm
- Forum: Ionic & Covalent Bonds
- Topic: CX and CN bonds [ENDORSED]
- Replies: 2
- Views: 730
Re: CX and CN bonds [ENDORSED]
CX bonds usually mean X is a certain element for a problem most likely. The length of a bond is shorter if the bond is stronger, such as if there are a larger number of bonds, single, double, and triple being the strongest.
- Sat Jul 20, 2019 5:35 pm
- Forum: Ionic & Covalent Bonds
- Topic: Radicals
- Replies: 7
- Views: 958
Re: Radicals
Radicals are when an element has a single electron un paired. This happens when the number of electrons is an odd number.
- Sat Jul 20, 2019 5:34 pm
- Forum: Ionic & Covalent Bonds
- Topic: Notation of electron configurations of ions
- Replies: 5
- Views: 3636
Re: Notation of electron configurations of ions
As is in the fourth period, therefore, 3d being a lower energy level it will be included in the electron configuration before 4s.
- Tue Jul 16, 2019 5:27 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Energy State
- Replies: 2
- Views: 547
Energy State
Hi,
I was wondering how one would be able to tell if an electron configuration is at its ground or excited state.
Thanks!
I was wondering how one would be able to tell if an electron configuration is at its ground or excited state.
Thanks!
- Sat Jul 13, 2019 3:06 pm
- Forum: Electronegativity
- Topic: Trend of Electronegativity
- Replies: 18
- Views: 4087
Re: Trend of Electronegativity
Yes they do, goes right across a period and up a group on the periodic table.
- Sat Jul 13, 2019 3:05 pm
- Forum: Electronegativity
- Topic: Electronegativity vs ionization energy
- Replies: 7
- Views: 960
Re: Electronegativity vs ionization energy
Electronegativity is the energy needed to gain an electron while ionization energy is the energy needed to lose an electron.
- Sat Jul 13, 2019 3:04 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs Covalent
- Replies: 2
- Views: 573
Re: Ionic vs Covalent
The book helps attest for the first part, but honestly there is probably some leeway to the numbers because of each elements bond length and/or other factors but I think it’s safe to think 2 and 1.5, easier to memorize as well!
- Sat Jul 13, 2019 3:03 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ion-Dipole
- Replies: 3
- Views: 873
Re: Ion-Dipole
Dipoles usually result from a great charge difference between the two ions. One would be partially negative and the other positive, one of the examples from the top of my head would be water I think. You can read more about it in the textbook, for me in the 6th edition it was around page 92.
- Sat Jul 13, 2019 3:01 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic Character
- Replies: 4
- Views: 585
Re: Ionic Character
It is based on the electro negativity difference, the greater it is, the more ionic character is has.
- Sat Jul 13, 2019 3:00 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs.covalent bonding
- Replies: 4
- Views: 738
Re: Ionic vs.covalent bonding
There are multiple ways to tell if it is covalent or ionic bonding. For ionic bonding, the electro negativity difference is greater than 2, for covalent, the difference is less that 1.5. There is some leeway in between the two values whether you factor in experimental values or proved in another way.
- Sat Jul 06, 2019 6:18 pm
- Forum: Photoelectric Effect
- Topic: Work function
- Replies: 1
- Views: 448
Work function
If given a problem to find the kinetic energy, will we be given the work function and energy of a photon (direct or indirectly)? In regards to the work function, do we have memorize some for certain metals or will they be mostly given in the problems that we will have to solve?
- Sat Jul 06, 2019 6:16 pm
- Forum: Photoelectric Effect
- Topic: kinetic energy of electron
- Replies: 8
- Views: 1116
Re: kinetic energy of electron
When the E (energy of the photon) equals the work function. Kinetic energy = energy of photon - work function
- Sat Jul 06, 2019 6:15 pm
- Forum: Einstein Equation
- Topic: E=hv [ENDORSED]
- Replies: 52
- Views: 18036
Re: E=hv [ENDORSED]
Represents the energy of the photon meanwhile the work function is the amount of energy needed to remove it.
- Sat Jul 06, 2019 6:13 pm
- Forum: Properties of Electrons
- Topic: Electron Configuration
- Replies: 9
- Views: 1110
Re: Electron Configuration
This might be one of the elements such as Cu and Cr that has been proven by experimental methods. Rather than trying to solve it out, probably one of the ones that should be memorized. However, professor Lavelle said we should only memorize Cu and Cr so we shouldn’t be too worried about that I’m pre...
- Sat Jul 06, 2019 6:11 pm
- Forum: Properties of Light
- Topic: wavelength
- Replies: 11
- Views: 1781
Re: wavelength
Yes it does, and frequency is the amount of repeated of the wave. Which makes them indirectly proportionate.
- Sat Jul 06, 2019 6:08 pm
- Forum: Empirical & Molecular Formulas
- Topic: Formulas
- Replies: 10
- Views: 2261
Re: Formulas
You first divide by the smallest mole then multiply the number that will make the empirical formula into all whole numbers. After that, you use the grams/mol that is given and divide the molar mass by that to see what is the factor that your moles have to be multiplied by.
- Sat Jul 06, 2019 6:05 pm
- Forum: Empirical & Molecular Formulas
- Topic: Molar Mass vs. Atomic Weight
- Replies: 7
- Views: 1300
Re: Molar Mass vs. Atomic Weight
They are pretty much the same thing. Molar mass is to find the mass for one mole. Atomic weight is the mass in grams, I’m pretty sure!
- Wed Jun 26, 2019 7:35 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Actual/Theoretical Yield
- Replies: 8
- Views: 4223
Re: Actual/Theoretical Yield
I doubt there is any question that asks to find a reason because like professor Lavelle said in class, the theoretical yield is the maximum and the actual yield will be less because of human error and the difficulty in precisely and accurately obtaining the correct yield, whether it be some solution...
- Wed Jun 26, 2019 7:33 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: G.5
- Replies: 3
- Views: 611
Re: G.5
When I saw this problem for the first time, I thought i had to use M1V1 = M2V2, however looking closer at the problem you don’t need it. First you want to find the molarity of Na2CO3 which is .08 M Na2CO3. Then you change the moms of Na to mol. You want to find the volume (in liters) so using dimens...
- Wed Jun 26, 2019 7:29 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: MOLARITY
- Replies: 17
- Views: 2049
Re: MOLARITY
Most of the time in chemistry, you will be using moles to compare two elements, compounds, or solutions. Considering this, the M1V1 = M2V2 comes from. Molarity = moles/volume so you are comparing the moles in the form of Molarity1*Volume1 = Molarity2*Volume2
- Wed Jun 26, 2019 7:26 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Balancing Equations [ENDORSED]
- Replies: 25
- Views: 1961
Re: Balancing Equations [ENDORSED]
I remember him saying that the ratios still make sense despite it not being a whole number. However for the sake of nature, I suppose, it is important to keep it at the lowest whole number to get your empirical/ molecular formula to get points on it on an exam.
- Wed Jun 26, 2019 7:25 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Moles in compound
- Replies: 2
- Views: 389
Re: Moles in compound
Given the molecular formula, you would find the molar mass, the sum of all the atomic masses. You would then divide the weight that you are given by the molar mass to find out how many moles of that certain compound you have.
- Wed Jun 26, 2019 7:22 pm
- Forum: Significant Figures
- Topic: Determine Usage of Sig Figs During Problem
- Replies: 2
- Views: 477
Determine Usage of Sig Figs During Problem
If the determined sig fig for the answer for a question is 3. Throughout the question would I used 3 sig figs for all values. For example, on the periodic table the atomic mass of oxygen is 15.999, but if the determined sig figs for the answer is 3 would I only use 15.9 or can I use 15.999 and round...
- Sat Dec 08, 2018 1:25 pm
- Forum: Empirical & Molecular Formulas
- Topic: Midterm Solutions Fall 2018-2019 year
- Replies: 2
- Views: 594
Midterm Solutions Fall 2018-2019 year
For question #2, the solution manual utilizes 2.0158 g for H when that is actually the weight in grams for two Hydrogen atoms. In order to solve this problem, which one will I have to use? 1.007 g H or 2.0158 g H2? I can follow along the other steps but I can’t seem to understand how to find the mol...
- Sat Dec 08, 2018 11:32 am
- Forum: Quantum Numbers and The H-Atom
- Topic: Representation of each Quantum Number
- Replies: 2
- Views: 532
Representation of each Quantum Number
Can someone clarify to me what each Quantum Number represents in relation to which orbital an electron will be in, how many electrons can a given atom contain, and the shape of the electron orbital?
- Sat Dec 08, 2018 11:19 am
- Forum: Quantum Numbers and The H-Atom
- Topic: Test #2 Question #5b
- Replies: 2
- Views: 358
Test #2 Question #5b
The question is what is the probability of finding an electron in the exact center of this orbital?
The answer is 0% but I can’t figure out why. Can someone explain this to me?
The answer is 0% but I can’t figure out why. Can someone explain this to me?
- Sat Dec 08, 2018 10:27 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Help with problem
- Replies: 1
- Views: 506
Help with problem
Hello I was looking if someone could clarify how to solve problem #1 on Test #2. It is about finding the uncertainty in velocity of the carbon monoxide molecule within the sac. When the sac has a diameter of 2*10^-4m.
- Fri Dec 07, 2018 10:24 am
- Forum: Administrative Questions and Class Announcements
- Topic: Modules
- Replies: 3
- Views: 512
Re: Modules
Hmm... alright thanks guys
- Wed Dec 05, 2018 3:52 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Modules
- Replies: 3
- Views: 512
Modules
Hi everyone, so I noticed that the modules helped me a lot with the first test and I was just wondering if there are any similar videos to them online somewhere! It would be great to go over them for finals. Thanks!