Search found 56 matches
- Sun Jan 10, 2021 7:27 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: change in K
- Replies: 22
- Views: 933
Re: change in K
Yes, temp is the only thing that changes k
- Sun Jan 10, 2021 7:26 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Concentration
- Replies: 12
- Views: 725
Re: Concentration
Concentration is in moles/liters. We can't have a negative amount of moles or a negative volume so it's positive
- Sun Jan 10, 2021 7:20 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Units
- Replies: 27
- Views: 1011
Re: Units
I think either bars or atm would work since they are similar. Most likely tho, Lavelle would tell us regarding the specific problem.
- Sun Jan 10, 2021 6:57 pm
- Forum: Ideal Gases
- Topic: reversing reactions
- Replies: 83
- Views: 5586
Re: reversing reactions
It is just the inverse of K or 1/K
- Sun Jan 10, 2021 6:56 pm
- Forum: Ideal Gases
- Topic: Units for Pressure
- Replies: 41
- Views: 2613
Re: Units for Pressure
the unit of pressure should be in atm
- Wed Dec 16, 2020 10:19 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Square planar complex vs tetrahedral complex
- Replies: 6
- Views: 3392
Re: Square planar complex vs tetrahedral complex
Tetrahedral is AX4. Square planar is AX4E2
- Wed Dec 16, 2020 10:15 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: pH formula?
- Replies: 69
- Views: 4135
Re: pH formula?
The pH formula is -log[H+]
- Wed Dec 16, 2020 10:15 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: Hard Water vs. Soft Water
- Replies: 9
- Views: 874
Re: Hard Water vs. Soft Water
Yes hard water is alkaline and soft water is acidic.
- Sun Dec 13, 2020 2:01 am
- Forum: Student Social/Study Group
- Topic: Plans for Relaxing After Finals
- Replies: 98
- Views: 16953
Re: Plans for Relaxing After Finals
Im just gonna binge watch netflix and yt but also have to read a book for my cluster class :(
- Fri Dec 11, 2020 11:47 pm
- Forum: Amphoteric Compounds
- Topic: Recognizing Amphoteric Compounds
- Replies: 9
- Views: 763
Re: Recognizing Amphoteric Compounds
You can determine if a species is acidic or basic bc if it donates a proton, then it’s acidic, if it accepts, then it’s basic.
- Sun Dec 06, 2020 11:08 pm
- Forum: Naming
- Topic: Monodentates and Polydentates
- Replies: 8
- Views: 652
Re: Monodentates and Polydentates
Polydentate ligands can form multiple bonds and create more than one coordinate covalent bond with the central metal atom while monodentate ligands bond at only one site
- Sun Dec 06, 2020 11:02 pm
- Forum: Naming
- Topic: Order of Ligands/naming
- Replies: 28
- Views: 1240
Re: Order of Ligands/naming
Goes in alphabetical order, excluding prefix.
- Sun Dec 06, 2020 10:52 pm
- Forum: Naming
- Topic: ligand names
- Replies: 4
- Views: 309
Re: ligand names
I doubt we can. We haven't been allowed to use notes or cheat sheets of any kind besides the equation sheet and periodic table. Maybe Lavelle will say we can later but rn i haven't heard anything abt being able to use a chart
Re: en
IreneGi2I wrote:I think it would be nice to practice and memorize some ligands on the ligand chart on textbook as well.
How do we find this chart?
Re: Sapling 1
Use name of the compound, ammine, first and disregard the prefixes when naming
- Sun Nov 29, 2020 11:46 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Easiest Way to Memorize Shape Names
- Replies: 9
- Views: 673
Re: Easiest Way to Memorize Shape Names
I think just doing a lot of practice problems is beneficial in memorizing the shapes and bond angles and becoming more familiar with the molecules. I also think that being able to visualize the 3D shape of the molecule is helpful. One of the UA's shared this website with us: http://intro.chem.oksta...
- Sun Nov 29, 2020 11:45 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: H2O VSEPR
- Replies: 27
- Views: 1368
Re: H2O VSEPR
Although there are 4 bonding regions for H20, there are still 2 lone pairs, makes the shape of molecule bent since the two lone pairs are pushing the electrons from the two bonded atoms
- Sun Nov 29, 2020 11:43 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pair E-
- Replies: 47
- Views: 2139
Re: Lone Pair E-
Lone pair electrons do count as their own region of electron density
- Sun Nov 29, 2020 11:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Equatorial/ Axial Planes
- Replies: 14
- Views: 915
Re: Equatorial/ Axial Planes
Equitorial planes are basically side to side while axial is up and down. so like in an xy graph, y is axial, and x is equitorial
- Sun Nov 29, 2020 11:35 pm
- Forum: Hybridization
- Topic: How to find the hybridization
- Replies: 14
- Views: 764
Re: How to find the hybridization
count the regions of e- density which is the number of bonds and lone pairs
- Sun Nov 29, 2020 11:34 pm
- Forum: Hybridization
- Topic: Sapling Week 7/8 HW #11
- Replies: 13
- Views: 620
Re: Sapling Week 7/8 HW #11
sp3 bc regions of e- density equals the number of hybrid orbitals. 1 LP plus 3 bonds equal 4 areas of e- density so its sp3
- Sun Nov 29, 2020 11:32 pm
- Forum: Hybridization
- Topic: Sigma and Pi bonds
- Replies: 29
- Views: 2818
Re: Sigma and Pi bonds
sigma bonds are just single bonds and pi bonds are in triple and double bonds. However, in a double bond, one is a sigma bond and the other is a pi bond. And in triple there are 2 pi bonds and one sigma bond
- Sun Nov 29, 2020 11:30 pm
- Forum: Hybridization
- Topic: Confused on hybridization conceptually
- Replies: 9
- Views: 645
Re: Confused on hybridization conceptually
Its easier if you write down the notes he gave in the lecture and have them at hand to refer to. Like by figuring out the regions of e- density you can figure out # of hybrid orbitals, and what I do is just have my notes to refer to, to figure out the hybridization formula. Gonna take some memorizat...
- Sun Nov 29, 2020 11:28 pm
- Forum: Hybridization
- Topic: How to simply determine hybridization
- Replies: 27
- Views: 11425
Re: How to simply determine hybridization
You calculate the regions of e- density to get the number of hybrid orbitals
- Sun Nov 29, 2020 11:20 pm
- Forum: Hybridization
- Topic: Sapling #11
- Replies: 19
- Views: 919
Re: Sapling #11
its sp3 bc the number of regions of e- density is 4, 1 lone pair and 3 bonds
- Sun Nov 29, 2020 11:13 pm
- Forum: Hybridization
- Topic: Sapling #12
- Replies: 29
- Views: 1180
Re: Sapling #12
When trying to find the hybridization orbitals look for the regions of e- density. C and O in that problem have 4 areas, u get sp3, S P P P being the 4 different orbitals that can have electrons.
- Sun Nov 15, 2020 8:53 pm
- Forum: Student Social/Study Group
- Topic: Class grade
- Replies: 18
- Views: 889
Re: Class grade
What are the negative impacts of changing it to pass/ no pass?
- Sun Nov 15, 2020 8:46 pm
- Forum: Student Social/Study Group
- Topic: Post Midterm Blues
- Replies: 71
- Views: 3864
Re: Post Midterm Blues
Sameeee. Before he posted the grades i knew for a fact i missed five questions and im [censored] bruh there goes my grade. I ended getting a 76% and im not proud of it but I'l take it. Now to grind for the next one ye
- Sun Nov 15, 2020 8:31 pm
- Forum: Student Social/Study Group
- Topic: Positive Encouragement for Midterm Week
- Replies: 14
- Views: 849
Re: Positive Encouragement for Midterm Week
Not me barely catching up on lectures and sapling haha. I kinda like the last minute study grind but its very stressful
- Sun Nov 15, 2020 8:20 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Importance of anions and cations
- Replies: 15
- Views: 1240
Re: Importance of anions and cations
The way I remember cations and anions is that cations have a "t" which closely resembles a "+" sign. So elements with the "+" are cations which means an e- was removed. And basically once you know what a cation is, one can deduce that an anion is the opposite.
- Sun Nov 15, 2020 8:20 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Importance of anions and cations
- Replies: 15
- Views: 1240
Re: Importance of anions and cations
The way I remember cations and anions is that cations have a "t" which closely resembles a "+" sign. So elements with the "+" are cations which means an e- was removed. And basically once you know what a cation is, one can deduce that an anion is the opposite.
- Sun Nov 15, 2020 8:17 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: polarizing power
- Replies: 3
- Views: 313
Re: polarizing power
Polarizability is how easily an electron cloud is distorted by an electric field. E- disortion is proportional to the polarizability of e-
- Sun Nov 08, 2020 10:47 pm
- Forum: Student Social/Study Group
- Topic: Studying From Home
- Replies: 91
- Views: 7483
Re: Studying From Home
I throw my phone against the wall and attempt to not touch it for at least an hour. If you're stuck, try to have a couple people you can ask questions to and hopefully they can explain it to you.
- Sun Nov 08, 2020 10:45 pm
- Forum: Student Social/Study Group
- Topic: Mid-quarter Check in
- Replies: 67
- Views: 3883
Re: Mid-quarter Check in
I want to be in in-person classes :(. Harder for me to concentrate online and it's harder to make friends to study with. Got LS30 midterm this upcoming week and im nervous.
- Sun Nov 08, 2020 10:24 pm
- Forum: Bond Lengths & Energies
- Topic: Delocalized Electrons
- Replies: 5
- Views: 353
Re: Delocalized Electrons
resonance means electrons are delocalized which means it's more stable.
- Sun Nov 08, 2020 10:10 pm
- Forum: Bond Lengths & Energies
- Topic: Bond length
- Replies: 11
- Views: 315
Re: Bond length
triple bonds are the shortest, next is second, finally single bonds r the longest
- Sun Nov 08, 2020 9:53 pm
- Forum: Ionic & Covalent Bonds
- Topic: Atomic Radius
- Replies: 38
- Views: 3221
Re: Atomic Radius
As we go across a period, the number of protons increase one by one, it results in a progressively higher electrostatic attraction
- Sun Nov 01, 2020 11:44 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Textbook solutions
- Replies: 3
- Views: 164
Re: Textbook solutions
thanks this helped so much!!!
- Sun Nov 01, 2020 11:35 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Sapling HW Q17
- Replies: 18
- Views: 1351
Re: Sapling HW Q17
Atomic radius increases as we move along the periodic table
- Sun Nov 01, 2020 11:33 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration
- Replies: 8
- Views: 386
Re: Electron Configuration
Why is 4s filled first?
- Sun Nov 01, 2020 11:23 pm
- Forum: Properties of Light
- Topic: Electromagnetic Spectrum
- Replies: 7
- Views: 467
Re: Electromagnetic Spectrum
400-700 visible light aka balmer series, 100-120, UV aka Lyman
- Sun Nov 01, 2020 11:05 pm
- Forum: Properties of Light
- Topic: Speed of light
- Replies: 25
- Views: 874
Re: Speed of light
2.998*10^8
- Sun Oct 25, 2020 10:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 577539
Re: Saying Thank You to Dr. Lavelle
Early appreciation post saying thanks for chem community bc this forum is saving me
- Sun Oct 25, 2020 9:39 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect Module Question
- Replies: 4
- Views: 394
Re: Photoelectric Effect Module Question
Hey, I have question from this same module. Question 30. "Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. .... What is the frequency of the incident light on the sodium metal surface?" Are you ...
- Sun Oct 25, 2020 9:12 pm
- Forum: Einstein Equation
- Topic: Post Assement audio visual
- Replies: 3
- Views: 265
Re: Post Assement audio visual
A tip for anyone seeing this. I kept getting the wrong answer bc i didn't put parantheses around (1mol/ Avogdro's constant) so make sure to do that. I was stuck on this problem for thirty minutes bc of this :(
- Sun Oct 25, 2020 7:44 pm
- Forum: SI Units, Unit Conversions
- Topic: Help Understanding SI Units?
- Replies: 7
- Views: 364
Re: Help Understanding SI Units?
angstrom is 10^-10
- Sun Oct 25, 2020 7:14 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect Module #29
- Replies: 9
- Views: 402
Re: Photoelectric Effect Module #29
Wait, so what's the answer?
- Sun Oct 18, 2020 10:37 pm
- Forum: Student Social/Study Group
- Topic: Midterm
- Replies: 7
- Views: 241
Re: Midterm
anyone want to form study groups for the midterm?
- Sun Oct 18, 2020 10:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Tutoring? [ENDORSED]
- Replies: 121
- Views: 274100
Re: Tutoring? [ENDORSED]
Im seeing this post from a few years ago and a reply said "I'm creating multiple review sessions for midterms/finals" and I assume it was Dr Lavelle or someone with the influence to create them. Will these session be created for the upcoming midterm in week 4?
- Sun Oct 18, 2020 10:31 pm
- Forum: Einstein Equation
- Topic: m vs nm
- Replies: 66
- Views: 3788
Re: m vs nm
Unless specified, its ok to write in either format
- Sun Oct 18, 2020 10:28 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Where can I buy a webcam for a reasonable price?
- Replies: 60
- Views: 3913
Re: Where can I buy a webcam for a reasonable price?
I believe we can use our phones instead so maybe you can pursue that option instead of buying one.
- Sun Oct 18, 2020 10:27 pm
- Forum: Photoelectric Effect
- Topic: photoelectric effect
- Replies: 17
- Views: 775
Re: photoelectric effect
yes, the threshold is the same thing as the work function
- Sun Oct 11, 2020 8:09 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student - Part II [ENDORSED]
- Replies: 298
- Views: 278508
Re: Advice from a Medical Student - Part II [ENDORSED]
How did you figure out how to do homework problems you were confused on? with covid and all, I'm having trouble even figuring out the basics of chem.
- Sun Oct 11, 2020 5:32 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Sapling HW Number 7
- Replies: 12
- Views: 516
Re: Sapling HW Number 7
That was very helpful, thanks for the help.
- Sun Oct 11, 2020 4:25 pm
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 444886
Re: Rusty on High School Chem [ENDORSED]
Coming from 2020 student, I'm semi-lost haha. Online is definitely not fun.
- Sun Oct 11, 2020 4:25 pm
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 444886
Re: Rusty on High School Chem [ENDORSED]
Coming from 2020 student, I'm semi-lost haha. Online is definitely not fun.