Search found 32 matches
- Fri Dec 07, 2018 11:59 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: Induced dipole?
- Replies: 3
- Views: 500
Induced dipole?
What is an induced dipole, and what does it have to do with London Dispersion?
- Fri Dec 07, 2018 11:58 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: Why are LDFs everywhere?
- Replies: 3
- Views: 1120
Why are LDFs everywhere?
Are LDFs present in every single molecule in existence, or just most? Secondly, why do all of these molecules even have LDFs present?
- Fri Dec 07, 2018 11:56 pm
- Forum: Dipole Moments
- Topic: Polarity in Trigonal bipyramidal structures
- Replies: 1
- Views: 503
Polarity in Trigonal bipyramidal structures
Why do dipole moments cancel out in Trigonal bipyramidal structures?
- Fri Dec 07, 2018 11:53 pm
- Forum: Sigma & Pi Bonds
- Topic: Why are sigma and pi bonds drawn differently?
- Replies: 1
- Views: 492
Why are sigma and pi bonds drawn differently?
At this point, I understand how to draw sigma and pi bonds in a diagram. But why are sigma bonds drawn so that the two areas of electron density overlap, while pi bonds are drawn so that the two areas of electron density are parallel and spaced apart (with a line connecting the two areas)? What does...
- Fri Dec 07, 2018 11:47 pm
- Forum: Lewis Acids & Bases
- Topic: Simple Question: What are they?
- Replies: 1
- Views: 218
Simple Question: What are they?
I understand Bronsted acids and bases, but What are Lewis Acids and Bases?
- Fri Dec 07, 2018 11:43 pm
- Forum: Hybridization
- Topic: Expanded Octet Hybridizations
- Replies: 2
- Views: 456
Expanded Octet Hybridizations
Why must we use d orbitals in the hybridization of atoms with expanded octets?
- Fri Dec 07, 2018 11:40 pm
- Forum: Conjugate Acids & Bases
- Topic: Chemical Equations
- Replies: 6
- Views: 678
Re: Chemical Equations
Picture having a simple reaction with two reactants and two products. One of the reactants is an acid, and the other reactant is a base. The reactant donates a proton in this reaction. The base accepts a proton in this reaction. The conjugate bases and acids are the two products. The conjugate base,...
- Fri Dec 07, 2018 11:35 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Factors for Acid Stength [ENDORSED]
- Replies: 3
- Views: 585
Factors for Acid Stength [ENDORSED]
How do size, electronegativity, and resonance influence an acid's strength?
- Fri Dec 07, 2018 11:32 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Oxygen atoms in acid structures?
- Replies: 3
- Views: 660
Oxygen atoms in acid structures?
If I start with an H–––O–––Cl molecule lewis acid structure, why would adding additional oxygens to the acid structure make it a stronger acid?
- Fri Dec 07, 2018 11:27 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: cisplatin Ligands?
- Replies: 1
- Views: 248
cisplatin Ligands?
What does it mean for Ligands to be cisplatin? Do cisplatin atoms arrange a certain way around other bonded molecules?
- Fri Dec 07, 2018 11:16 pm
- Forum: Significant Figures
- Topic: Sig Figs in pH and OH
- Replies: 1
- Views: 476
Sig Figs in pH and OH
For pH and OH, Why is it that only the digits after the decimal point count as sig figs? Why does it have this special rule?
- Fri Dec 07, 2018 8:56 pm
- Forum: Dipole Moments
- Topic: Differences in electronegativity
- Replies: 2
- Views: 529
Differences in electronegativity
Hey everyone. I was taking notes during one of the review sessions today, and I made the following note: "dipole moments occur when you have differences in electronegativity between _____." I never heard what the UA said after that, so I was wondering if anyone could help me fill in the re...
- Fri Dec 07, 2018 8:53 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Transition metals & their oxidations states
- Replies: 1
- Views: 619
Transition metals & their oxidations states
Why can transition metals occupy several different oxidation states? Why does this make them very useful for electron transfer?
- Fri Dec 07, 2018 8:51 pm
- Forum: Coordinate Covalent Bonds
- Topic: Myoglobin
- Replies: 6
- Views: 975
Myoglobin
"The amino acid histidine binds to the heme complex iron to form myoglobin." Why can four myoglobins form a hemoglobin, and why can myoglobin bind to four O2 molecules?
- Fri Dec 07, 2018 8:45 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AX2E3 (i.e. linear) Molecular geometry
- Replies: 1
- Views: 1398
AX2E3 (i.e. linear) Molecular geometry
Why are molecules with a VSEPR equation of AX2E3 linear? I am struggling to visualize how it is linear because there are three lone pairs of electrons that should supposedly be pushing the bond angles to less than 180 degrees.
- Fri Dec 07, 2018 8:41 pm
- Forum: Hybridization
- Topic: How does hybridization tell us the # of bonds?
- Replies: 1
- Views: 220
How does hybridization tell us the # of bonds?
Hey everyone! In the review session today, the UA said that hybridization helps tell us the number of bonds. This made me confused because I just thought that it reflects the number of areas of electron density. So, say if there was a molecule that had double or even triple bonds, how would we use h...
- Fri Dec 07, 2018 8:37 pm
- Forum: Hybridization
- Topic: The purpose of hybridization
- Replies: 1
- Views: 251
The purpose of hybridization
Why do we use hybridization to characterize molecules? How does it further our understanding of the molecule's shape? I would like to better understand how I can use hybridization as a tool for understanding chemistry.
- Mon Nov 19, 2018 7:00 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sigma vs. Pi Bonds (What's the difference?)
- Replies: 4
- Views: 341
Sigma vs. Pi Bonds (What's the difference?)
What's difference between σ bonds and π bonds? Do they tell us anything about a difference in the strengths of the individual bonds?
- Mon Nov 19, 2018 6:41 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Different-looking N — H bonds in the Lewis structure for Ammonia (NH3)
- Replies: 3
- Views: 1122
Different-looking N — H bonds in the Lewis structure for Ammonia (NH3)
Hi everyone! Please refer to the following .jpg picture for my question: http://oer2go.org/mods/en-boundless/figures.boundless-cdn.com/30054/full/lewis%20dot%20structure%20for%20ammonia.jpg This image shows a lewis structure for Ammonia (NH3). However, there is one regular bond (just a straight line...
- Mon Nov 19, 2018 6:35 pm
- Forum: Hybridization
- Topic: Identifying types of bonds and hybridization in Lewis Structures
- Replies: 3
- Views: 484
Identifying types of bonds and hybridization in Lewis Structures
Hi everyone! Now that we've gone over hybridization in lecture, do we have to start drawing our lewis structures any differently? Also, are we now going to be graded on whether or not we identify the types of bonds and whether or not we identify areas of hybridization? For instance, in lecture today...
- Mon Nov 19, 2018 6:22 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bold/Dashed Lines in Bonds
- Replies: 4
- Views: 537
Re: Bold/Dashed Lines in Bonds
Hi, I had the same question. But does it matter which atoms we draw does the foreground vs. background? Or does that not matter? Additionally, how to we draw Hydrogen bonds? Do they get dashed or anything like that too?
- Mon Nov 05, 2018 4:50 pm
- Forum: Lewis Structures
- Topic: Lewis Structure for N2O
- Replies: 7
- Views: 1223
Re: Lewis Structure for N2O
^but doesn't Oxygen have a lower Ionization Energy than Nitrogen because Nitrogen is more stable due to having a half-filled p-orbital?
- Sun Nov 04, 2018 10:52 pm
- Forum: Lewis Structures
- Topic: 4th & 9th groups in Lewis Structures
- Replies: 1
- Views: 203
4th & 9th groups in Lewis Structures
Why is it that for the 4th and 9th columns in the periodic table (like Chromium) in the d-orital, the structure gets unstable and one of the 4s goes into the 3d? What does this mean?
- Sun Nov 04, 2018 10:42 pm
- Forum: Lewis Structures
- Topic: Expanded Octet Atoms/Exceptions
- Replies: 2
- Views: 284
Expanded Octet Atoms/Exceptions
What are all of the atoms/elements that may have an expanded octet? (essentially, I don't know all of the exceptions to the octet rule yet). Also, why is it that the third period can have expanded octets even though there's no d-orbital? Thanks so much!
- Sun Nov 04, 2018 10:40 pm
- Forum: Lewis Structures
- Topic: Steps for Lewis Structures
- Replies: 3
- Views: 326
Steps for Lewis Structures
Hi everyone! This is more of a conceptual/study method type of question. I was wondering if y'all could share how you approach Lewis Structure problems, specifically in terms of doing it in steps (because that would help me get through problems more effectively). For instance, the first step would b...
- Sun Nov 04, 2018 10:10 pm
- Forum: Lewis Structures
- Topic: Lewis Structure for N2O
- Replies: 7
- Views: 1223
Lewis Structure for N2O
I'm confused on trying to write out a Lewis Structure for N2O. How would it be written/Which atom goes in the center of the Lewis Structure in this case and why?
- Sun Oct 21, 2018 9:13 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Electron Spin States?
- Replies: 4
- Views: 211
Electron Spin States?
In section 1D.5 of the textbook, it goes into Electron Spin, but I am confused by this conceptually. Why would an electron's spin actually affect spectral lines to have different frequencies than than what Schrodinger calculated? Why does it matter/why is it important to know whether an electron has...
- Sun Oct 21, 2018 9:06 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: I'm uncertain about the Uncertainty Principle
- Replies: 2
- Views: 259
I'm uncertain about the Uncertainty Principle
I am confused by the explanation/context at the beginning of section 1B.3 in the textbook. In the textbook, they use an example of guitar strings, but that just confuses me because it doesn't help me actually visualize the particle. Can anyone please explain (conceptually) why the location of a part...
- Sun Oct 21, 2018 8:58 pm
- Forum: Properties of Light
- Topic: Using a rounded speed of light in EM problems
- Replies: 4
- Views: 670
Using a rounded speed of light in EM problems
Hey y'all! As we all know, we have to use the equation "wavelength x frequency = speed of light" quite a lot in this topic. When I was solving problem #1A.9, I was questioning whether I was using the speed of light properly because I rounded 2.998 x 10^8 m/s to 3 x 10^8 m/s. Because of thi...
- Thu Oct 04, 2018 10:24 pm
- Forum: Administrative Questions and Class Announcements
- Topic: How much work must be shown to receive full credit?
- Replies: 1
- Views: 181
How much work must be shown to receive full credit?
Does it matter how detailed our work is when we solve problems ? I feel like I'm explaining and showing my work for every little step just to ensure that I receive credit for my work. However, I would get through more problems if I based the amount of work that I show off of my own personal preferen...
- Thu Oct 04, 2018 10:19 pm
- Forum: Significant Figures
- Topic: Sig figs for Avogadro's number
- Replies: 3
- Views: 350
Sig figs for Avogadro's number
Where should we round Avogadro's number to? When I use it in my calculations, should I write it as 6.022140857 × 10^23 , 6.0221 × 10^23 , or 6.022 × 10^23 , etc.?
- Thu Oct 04, 2018 10:16 pm
- Forum: Significant Figures
- Topic: Using Sig Figs Throughout a Problem?
- Replies: 6
- Views: 1142
Using Sig Figs Throughout a Problem?
On question E.2. in the textbook, I converted 90 years into 2,838,240,000 seconds. I continued to use this long & precise number in my calculations, meaning I never used sig figs throughout the various steps of the problem. I only used sig figs for my final answer. Are we supposed to use sig fig...