Search found 52 matches
- Sun Dec 08, 2019 7:45 pm
- Forum: Student Social/Study Group
- Topic: Final discussion
- Replies: 4
- Views: 450
Final discussion
Does anyone know why we were told not to worry about titrations/we spent like 7 minutes on it and there was a whole page on the final of it? Genuinely curious,
- Sat Dec 07, 2019 11:39 am
- Forum: Naming
- Topic: overall charge ion
- Replies: 1
- Views: 189
overall charge ion
Can someone explain to me how this has an overall charge of 2
K4[Fe(CN)6]
K4[Fe(CN)6]
- Sat Dec 07, 2019 11:26 am
- Forum: Naming
- Topic: Explanation of overall charge of ion
- Replies: 2
- Views: 290
Explanation of overall charge of ion
Can someone explain to me how this overall charge of this ion is 4....
[Pt(H2NCH2CH2NH2)2Cl2]Cl2
[Pt(H2NCH2CH2NH2)2Cl2]Cl2
- Thu Dec 05, 2019 10:35 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination #
- Replies: 6
- Views: 515
Coordination #
Can someone explain to me how to determine how many coordination numbers a molecule has? I'm currently doing some homework and need some clarification.
- Thu Dec 05, 2019 1:44 pm
- Forum: Conjugate Acids & Bases
- Topic: Hydrogen Question
- Replies: 2
- Views: 217
Hydrogen Question
Do they want us to remove all the hydrogens when trying to get a conjugate base?
- Tue Dec 03, 2019 11:58 pm
- Forum: Bronsted Acids & Bases
- Topic: Homework Question
- Replies: 2
- Views: 242
Homework Question
Can anyone explain to me why H2SO3 is a Bronsted Acid? I tried to explain it to myself but I got more confused.
- Sun Dec 01, 2019 11:16 pm
- Forum: Lewis Acids & Bases
- Topic: Homework
- Replies: 4
- Views: 301
Re: Homework
madawy wrote:yeah, we turn in two to make up for last week.
Thank you!!
- Sun Dec 01, 2019 11:14 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Class wed 11/27
- Replies: 7
- Views: 535
Re: Class wed 11/27
sbeall_1C wrote:Dr. Lavelle went over pH and pOH in greater detail, and how to derive the pH scale! If you read the section on acid and base naturalization and the relationship between pH, pOH, and pKa, you should be good!
Thank you! This is helpful as well. :)
- Sun Dec 01, 2019 11:13 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Class wed 11/27
- Replies: 7
- Views: 535
Re: Class wed 11/27
Baoying Li 4H wrote:1. Reaction btw acid and base--Neutralization
2. Writing [H3O+] AND [OH-] as logarithms
3. Relative acidity (Binary, oxoacid, carboxylic)
Hope this helps!
Thank you!! I appreciate this.
- Sun Dec 01, 2019 11:11 pm
- Forum: Lewis Acids & Bases
- Topic: Homework
- Replies: 4
- Views: 301
Homework
Does anyone know if for week 10 discussions on Thursday and Friday have to submit two separate homeworks for the last discussion?
- Sun Dec 01, 2019 11:05 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: How to tell
- Replies: 3
- Views: 314
How to tell
How can you tell what an acid and a base? Like what is an easy way of determining the difference?
- Sun Dec 01, 2019 11:01 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Class wed 11/27
- Replies: 7
- Views: 535
Class wed 11/27
Can anyone briefly explain what Lavelle went over on the 27th of November? Just so I can read about it on the textbook/
- Thu Nov 21, 2019 6:08 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: QUiz 2
- Replies: 2
- Views: 198
QUiz 2
Are we getting tested on the io-ion interactions?? I'm looking at this forum and it seems like we are but my TA only went over three intermolecular forces and I just want to make sure because another TA went over all the bondings.
- Wed Nov 20, 2019 10:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Octahedral
- Replies: 6
- Views: 439
Re: Octahedral
Thank you for asking this because you weren't the only one wondering! All the responses are helpful.
- Wed Nov 20, 2019 10:24 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone pairs
- Replies: 13
- Views: 762
Re: Lone pairs
I don't think so. The way I drew that specific molecule you gave was that I put a triple bond between C and N and the H on the left side of C. I don't think the lone pairs in N account for its shape in this particular example. However, someone correct me if I'm wrong.
- Wed Nov 20, 2019 8:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 2
- Replies: 5
- Views: 320
Re: Test 2
I think Lavelle said that from 2D-the slide that was taught on Monday will be on the exam.
- Wed Nov 20, 2019 8:08 pm
- Forum: Hybridization
- Topic: Quiz 2 Hybridization Question
- Replies: 4
- Views: 332
Quiz 2 Hybridization Question
Just to make sure once again, we do not need to know hybridization for the quiz correct??
- Sun Nov 17, 2019 1:05 pm
- Forum: Dipole Moments
- Topic: Polarity
- Replies: 12
- Views: 633
Re: Polarity
505106414 wrote:What is dipole-dipole? I know we talked about it a lot in class but I am still confused.
Dipole-Dipole just means a partial positive and a partial negative interaction between molecules.
- Sun Nov 17, 2019 12:58 pm
- Forum: Dipole Moments
- Topic: Polarity
- Replies: 12
- Views: 633
Re: Polarity
Andrew Liang 4G wrote:Another tip that I learned from my TA today was that most of the time when the central atom has lone pairs then the molecule is most likely to be polar.
Thank you so much for this! This is very helpful.
- Thu Nov 14, 2019 2:21 pm
- Forum: Bond Lengths & Energies
- Topic: Dashes and Wedges
- Replies: 4
- Views: 313
Dashes and Wedges
Since there won't be anything on next week's quiz about dashes and wedges then does that mean they wouldn't ask about tetrahedral, trigonal bipyramidal or octahedral shapes? Or would they but just as 2D?
- Thu Nov 14, 2019 2:12 pm
- Forum: Bond Lengths & Energies
- Topic: Quiz for Next week dashes/wedges
- Replies: 11
- Views: 660
Quiz for Next week dashes/wedges
Does anyone know if there's going to be a question on the quiz about dashes and wedges? Or anything related to that because Lavelle said not to worry about it in lecture.
- Thu Nov 14, 2019 2:07 pm
- Forum: Bond Lengths & Energies
- Topic: Electron Density
- Replies: 10
- Views: 660
Electron Density
Are lone pairs considered regions of electron density?
- Thu Nov 14, 2019 2:05 pm
- Forum: Electronegativity
- Topic: H2O and e- density
- Replies: 2
- Views: 177
H2O and e- density
For H2O is there 2 regions of e- density or do you count the lone pairs?
- Thu Nov 14, 2019 2:02 pm
- Forum: Dipole Moments
- Topic: Polarity
- Replies: 12
- Views: 633
Polarity
How to know if a molecule is polar/nonpolar? Any tips?
- Wed Nov 06, 2019 11:37 am
- Forum: Administrative Questions and Class Announcements
- Topic: Equation Sheet
- Replies: 2
- Views: 195
Equation Sheet
Will we be given all of the equations we will need for the midterm? My TA mentioned that they wouldn't give them all so I'm kind of concerned.
- Tue Nov 05, 2019 9:24 pm
- Forum: Ionic & Covalent Bonds
- Topic: Lattice Energy
- Replies: 2
- Views: 222
Lattice Energy
Do we have to know this for the test?
- Tue Nov 05, 2019 5:14 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: van der Waals radius
- Replies: 1
- Views: 219
van der Waals radius
Are we going to be tested on Van Der Waals radius specifically? I remember someone telling me Lavelle wasn't going to call it Van der Waals radius on the test.
- Mon Nov 04, 2019 11:30 pm
- Forum: *Black Body Radiation
- Topic: Ludwig Boltzmann law midterm question
- Replies: 3
- Views: 378
Ludwig Boltzmann law midterm question
I don't recall if Lavelle said that this was going to be on the exam? Should I worry about learning how to use this? It was technically in section 1B but I'm still kind of concerned whether I have to know how to use this equation
- Mon Nov 04, 2019 1:45 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Textbook question
- Replies: 3
- Views: 312
Textbook question
When looking through the textbook I noticed that when they calculated the molar concentration of a solute they used both the c=n/v and m=n/M.
Can anyone help me figure out why?
Can anyone help me figure out why?
- Mon Nov 04, 2019 12:49 pm
- Forum: SI Units, Unit Conversions
- Topic: Memorizing Conversions
- Replies: 25
- Views: 1384
Memorizing Conversions
We don't have to memorize the conversions right? I remember there being a reference sheet for the first quiz but I'm curious if that'll be the case for pm, micrometers, nano, etc.
- Sun Nov 03, 2019 4:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: TOPICS for Midterm help
- Replies: 2
- Views: 115
TOPICS for Midterm help
Hello, I'm looking at the learning outcomes on the Chemistry website and I was just curious to know up to which outcome are we stopping for midterm one? Is it outline 4? Thanks!
- Thu Oct 31, 2019 2:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Posts
- Replies: 3
- Views: 164
Posts
I have a question about posting. If I'm replying to a classmate and we discuss a question do the replies count as posts? I mean, technically it's still posting and you're still engaging in discussion with the community right?
- Thu Oct 31, 2019 2:15 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 4
- Views: 201
Re: Formal Charge
Daria Azizad 1K wrote:No, charge will always be a whole number. Whenever we divide by two in the FC equation, the numerator will be an even number, as it refers to pairs of electrons.
What's the formal charge of NaOH?
- Thu Oct 31, 2019 2:07 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 4
- Views: 201
Formal Charge
Can we have halves in the equation and the final answer?
- Sun Oct 27, 2019 7:29 pm
- Forum: Trends in The Periodic Table
- Topic: Cations
- Replies: 8
- Views: 382
Re: Cations
Why are cations smaller than their parent atoms? The way that my PLF told me to remember was that Cat-ions (paw-sitive) means that they're losing an electron (bc it's positive) and the Anion is like onion crying because it's gaining an electron. If it's losing an electron that means it's smaller th...
- Sun Oct 27, 2019 6:59 pm
- Forum: Lewis Structures
- Topic: Octet Rule
- Replies: 7
- Views: 202
Re: Octet Rule
Helium probably wouldn't bond with other elements because it is already stable as a noble gas. Noble gasses are known not to react with other elements. Okay, then let's say it's a different element like Carbon. Would it still be following the rule? Lewis structures show how atoms are bonded togethe...
- Sun Oct 27, 2019 6:44 pm
- Forum: Resonance Structures
- Topic: Bond lenghts.
- Replies: 11
- Views: 423
Re: Bond lenghts.
We haven't been taught how exactly to obtain measurements for bond lengths as of now. Professor Lavelle specified the different lengths to prove that double and triple bonds have higher attraction and thus shorter lengths than single bonds, and the bonds for resonance structures have lengths betwee...
- Sun Oct 27, 2019 6:21 pm
- Forum: Lewis Structures
- Topic: Octet Rule
- Replies: 7
- Views: 202
Re: Octet Rule
KHowe_1B wrote:Helium probably wouldn't bond with other elements because it is already stable as a noble gas. Noble gasses are known not to react with other elements.
Okay, then let's say it's a different element like Carbon. Would it still be following the rule?
- Sun Oct 27, 2019 6:20 pm
- Forum: Lewis Structures
- Topic: Octet Rule
- Replies: 7
- Views: 202
Re: Octet Rule
Does this also apply for Nitrogen with Hydrogen and Helium? Would Nitrogen be following the rule? When they're together doesn't the bond technically make it a pair?
- Sun Oct 27, 2019 6:16 pm
- Forum: Lewis Structures
- Topic: Octet Rule
- Replies: 7
- Views: 202
Octet Rule
So when there's a molecule like Oxygen and Helium together in a lewis dot structure does is it valid to say that Heliums electron is part of Oxygens now and now is following the Octet rule?
- Sun Oct 27, 2019 5:58 pm
- Forum: Lewis Structures
- Topic: Video Modules
- Replies: 11
- Views: 471
Re: Video Modules
Does anyone know if Professor Lavelle is planning on uploading more video modules on to his website? Or is the "Heisenberg Uncertainty Principle" going to be the last video? Does anyone know if he's planning to upload slides to CCLE? Or has he already answered that question? It would be s...
- Sun Oct 27, 2019 5:50 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Using periodic table to find configurations?
- Replies: 3
- Views: 174
Using periodic table to find configurations?
Can the periodic table be used to do the molecule configuration because you can use it to find out how many subshells/orbitals it has right? Please correct me if I'm wrong. Thank you!
- Sun Oct 27, 2019 5:47 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Useful YouTube videos?
- Replies: 6
- Views: 281
Useful YouTube videos?
Does anyone have any useful youtube videos that will help me further understand the Quantum World/Orbitals/Subshells? Thanks!!
- Thu Oct 17, 2019 12:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Calculator Question
- Replies: 2
- Views: 176
Calculator Question
My calculator doesn't give me the answer in scientific notation if it isn't over 10^5. Would I get points taken off if the answer is correct just not specifically in scientific notation? Would I get points taken off even if it's not asked to give an answer in scientific notation?
- Thu Oct 17, 2019 12:29 pm
- Forum: DeBroglie Equation
- Topic: Constant Question
- Replies: 7
- Views: 368
Constant Question
Does it make it a big difference if you switch the constant from 6.626 to 6.63 for p?
- Tue Oct 15, 2019 7:49 pm
- Forum: Properties of Light
- Topic: Angstrom
- Replies: 10
- Views: 516
Re: Angstrom
AlyshaP_3G wrote:I think the units will be clarified in the questions. If they aren't, I would probably stick to one of the more conventional ones such as m or nm!
I agree with this answer! During the quiz, they definitely clarified what to convert the units to.
- Tue Oct 15, 2019 4:26 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric effect
- Replies: 5
- Views: 221
Photoelectric effect
In the module, Dr. Lavelle talks about how different metals will give us different results. Where do you account for a different metal in the equation? Does it matter what metal we assume it is if it doesn't give us that information?
- Mon Oct 14, 2019 12:13 am
- Forum: Einstein Equation
- Topic: Einstein Equation
- Replies: 4
- Views: 257
Einstein Equation
When do you use the E = hν equation?
- Sun Oct 13, 2019 10:44 pm
- Forum: Properties of Light
- Topic: Color, Frequency, and Wavelength of Electromagnetic Radiation
- Replies: 1
- Views: 71
Color, Frequency, and Wavelength of Electromagnetic Radiation
Does anyone think we'll actually have to memorize the entire chart of the electromagnetic spectrum or even some of it?
- Fri Oct 04, 2019 2:38 pm
- Forum: Properties of Light
- Topic: c = fλ
- Replies: 9
- Views: 517
c = fλ
During the lecture, Dr. Lavelle posted on the slide show that c = fλ = 3.00 x 10^8 m.s. ^-1
Is this always true?
Is this always true?
- Thu Oct 03, 2019 11:40 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactants or Reagents Module
- Replies: 2
- Views: 185
Limiting Reactants or Reagents Module
During the module, Dr. Lavelle said to only worry about calculating the molar mass of each reactant and to not worry about the product... maybe I just need to keep watching the video but can anyone remind me what he said in the lecture? Does this apply to every equation?
- Wed Oct 02, 2019 8:18 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Unit Conversion for Molarity/Dilution
- Replies: 3
- Views: 132
Unit Conversion for Molarity/Dilution
When you're solving a problem that has the mL unit do you convert the mL to L before you begin to do the work or do you do it after you've solved the problem? Does it matter?