Search found 52 matches

by 105194078
Sun Dec 08, 2019 7:45 pm
Forum: Student Social/Study Group
Topic: Final discussion
Replies: 4
Views: 157

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,
by 105194078
Sat Dec 07, 2019 11:39 am
Forum: Naming
Topic: overall charge ion
Replies: 1
Views: 20

overall charge ion

Can someone explain to me how this has an overall charge of 2
K4[Fe(CN)6]
by 105194078
Sat Dec 07, 2019 11:26 am
Forum: Naming
Topic: Explanation of overall charge of ion
Replies: 2
Views: 32

Explanation of overall charge of ion

Can someone explain to me how this overall charge of this ion is 4....
[Pt(H2NCH2CH2NH2)2Cl2]Cl2
by 105194078
Thu Dec 05, 2019 10:35 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination #
Replies: 6
Views: 67

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.
by 105194078
Thu Dec 05, 2019 1:44 pm
Forum: Conjugate Acids & Bases
Topic: Hydrogen Question
Replies: 2
Views: 43

Hydrogen Question

Do they want us to remove all the hydrogens when trying to get a conjugate base?
by 105194078
Tue Dec 03, 2019 11:58 pm
Forum: Bronsted Acids & Bases
Topic: Homework Question
Replies: 2
Views: 33

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.
by 105194078
Sun Dec 01, 2019 11:16 pm
Forum: Lewis Acids & Bases
Topic: Homework
Replies: 4
Views: 48

Re: Homework

madawy wrote:yeah, we turn in two to make up for last week.


Thank you!!
by 105194078
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: 80

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. :)
by 105194078
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: 80

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.
by 105194078
Sun Dec 01, 2019 11:11 pm
Forum: Lewis Acids & Bases
Topic: Homework
Replies: 4
Views: 48

Homework

Does anyone know if for week 10 discussions on Thursday and Friday have to submit two separate homeworks for the last discussion?
by 105194078
Sun Dec 01, 2019 11:05 pm
Forum: Identifying Acidic & Basic Salts
Topic: How to tell
Replies: 3
Views: 45

How to tell

How can you tell what an acid and a base? Like what is an easy way of determining the difference?
by 105194078
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: 80

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/
by 105194078
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: 58

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.
by 105194078
Wed Nov 20, 2019 10:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Octahedral
Replies: 6
Views: 61

Re: Octahedral

Thank you for asking this because you weren't the only one wondering! All the responses are helpful.
by 105194078
Wed Nov 20, 2019 10:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs
Replies: 13
Views: 95

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.
by 105194078
Wed Nov 20, 2019 8:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 5
Views: 83

Re: Test 2

I think Lavelle said that from 2D-the slide that was taught on Monday will be on the exam.
by 105194078
Wed Nov 20, 2019 8:08 pm
Forum: Hybridization
Topic: Quiz 2 Hybridization Question
Replies: 4
Views: 64

Quiz 2 Hybridization Question

Just to make sure once again, we do not need to know hybridization for the quiz correct??
by 105194078
Sun Nov 17, 2019 1:05 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 12
Views: 117

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.
by 105194078
Sun Nov 17, 2019 12:58 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 12
Views: 117

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.
by 105194078
Thu Nov 14, 2019 2:21 pm
Forum: Bond Lengths & Energies
Topic: Dashes and Wedges
Replies: 4
Views: 33

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?
by 105194078
Thu Nov 14, 2019 2:12 pm
Forum: Bond Lengths & Energies
Topic: Quiz for Next week dashes/wedges
Replies: 11
Views: 122

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.
by 105194078
Thu Nov 14, 2019 2:07 pm
Forum: Bond Lengths & Energies
Topic: Electron Density
Replies: 10
Views: 160

Electron Density

Are lone pairs considered regions of electron density?
by 105194078
Thu Nov 14, 2019 2:05 pm
Forum: Electronegativity
Topic: H2O and e- density
Replies: 2
Views: 36

H2O and e- density

For H2O is there 2 regions of e- density or do you count the lone pairs?
by 105194078
Thu Nov 14, 2019 2:02 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 12
Views: 117

Polarity

How to know if a molecule is polar/nonpolar? Any tips?
by 105194078
Wed Nov 06, 2019 11:37 am
Forum: Administrative Questions and Class Announcements
Topic: Equation Sheet
Replies: 2
Views: 40

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.
by 105194078
Tue Nov 05, 2019 9:24 pm
Forum: Ionic & Covalent Bonds
Topic: Lattice Energy
Replies: 2
Views: 36

Lattice Energy

Do we have to know this for the test?
by 105194078
Tue Nov 05, 2019 5:14 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: van der Waals radius
Replies: 1
Views: 112

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.
by 105194078
Mon Nov 04, 2019 11:30 pm
Forum: *Black Body Radiation
Topic: Ludwig Boltzmann law midterm question
Replies: 3
Views: 150

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
by 105194078
Mon Nov 04, 2019 1:45 pm
Forum: Molarity, Solutions, Dilutions
Topic: Textbook question
Replies: 3
Views: 168

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?
by 105194078
Mon Nov 04, 2019 12:49 pm
Forum: SI Units, Unit Conversions
Topic: Memorizing Conversions
Replies: 23
Views: 486

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.
by 105194078
Sun Nov 03, 2019 4:35 pm
Forum: Administrative Questions and Class Announcements
Topic: TOPICS for Midterm help
Replies: 2
Views: 35

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!
by 105194078
Thu Oct 31, 2019 2:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Posts
Replies: 3
Views: 53

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?
by 105194078
Thu Oct 31, 2019 2:15 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 4
Views: 45

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?
by 105194078
Thu Oct 31, 2019 2:07 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 4
Views: 45

Formal Charge

Can we have halves in the equation and the final answer?
by 105194078
Sun Oct 27, 2019 7:29 pm
Forum: Trends in The Periodic Table
Topic: Cations
Replies: 8
Views: 74

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...
by 105194078
Sun Oct 27, 2019 6:59 pm
Forum: Lewis Structures
Topic: Octet Rule
Replies: 7
Views: 73

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...
by 105194078
Sun Oct 27, 2019 6:44 pm
Forum: Resonance Structures
Topic: Bond lenghts.
Replies: 11
Views: 91

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...
by 105194078
Sun Oct 27, 2019 6:21 pm
Forum: Lewis Structures
Topic: Octet Rule
Replies: 7
Views: 73

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?
by 105194078
Sun Oct 27, 2019 6:20 pm
Forum: Lewis Structures
Topic: Octet Rule
Replies: 7
Views: 73

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?
by 105194078
Sun Oct 27, 2019 6:16 pm
Forum: Lewis Structures
Topic: Octet Rule
Replies: 7
Views: 73

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?
by 105194078
Sun Oct 27, 2019 5:58 pm
Forum: Lewis Structures
Topic: Video Modules
Replies: 11
Views: 130

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...
by 105194078
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: 46

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!
by 105194078
Sun Oct 27, 2019 5:47 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Useful YouTube videos?
Replies: 6
Views: 76

Useful YouTube videos?

Does anyone have any useful youtube videos that will help me further understand the Quantum World/Orbitals/Subshells? Thanks!!
by 105194078
Thu Oct 17, 2019 12:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Calculator Question
Replies: 2
Views: 53

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?
by 105194078
Thu Oct 17, 2019 12:29 pm
Forum: DeBroglie Equation
Topic: Constant Question
Replies: 7
Views: 98

Constant Question

Does it make it a big difference if you switch the constant from 6.626 to 6.63 for p?
by 105194078
Tue Oct 15, 2019 7:49 pm
Forum: Properties of Light
Topic: Angstrom
Replies: 10
Views: 89

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.
by 105194078
Tue Oct 15, 2019 4:26 pm
Forum: Photoelectric Effect
Topic: Photoelectric effect
Replies: 5
Views: 79

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?
by 105194078
Mon Oct 14, 2019 12:13 am
Forum: Einstein Equation
Topic: Einstein Equation
Replies: 4
Views: 89

Einstein Equation

When do you use the E = hν equation?
by 105194078
Sun Oct 13, 2019 10:44 pm
Forum: Properties of Light
Topic: Color, Frequency, and Wavelength of Electromagnetic Radiation
Replies: 1
Views: 24

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?
by 105194078
Fri Oct 04, 2019 2:38 pm
Forum: Properties of Light
Topic: c = fλ
Replies: 9
Views: 94

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?
by 105194078
Thu Oct 03, 2019 11:40 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactants or Reagents Module
Replies: 2
Views: 54

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?
by 105194078
Wed Oct 02, 2019 8:18 pm
Forum: Molarity, Solutions, Dilutions
Topic: Unit Conversion for Molarity/Dilution
Replies: 3
Views: 35

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?

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