Search found 32 matches

by 005199750
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: 165

Induced dipole?

What is an induced dipole, and what does it have to do with London Dispersion?
by 005199750
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: 191

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?
by 005199750
Fri Dec 07, 2018 11:56 pm
Forum: Dipole Moments
Topic: Polarity in Trigonal bipyramidal structures
Replies: 1
Views: 172

Polarity in Trigonal bipyramidal structures

Why do dipole moments cancel out in Trigonal bipyramidal structures?
by 005199750
Fri Dec 07, 2018 11:53 pm
Forum: Sigma & Pi Bonds
Topic: Why are sigma and pi bonds drawn differently?
Replies: 1
Views: 162

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...
by 005199750
Fri Dec 07, 2018 11:47 pm
Forum: Lewis Acids & Bases
Topic: Simple Question: What are they?
Replies: 1
Views: 42

Simple Question: What are they?

I understand Bronsted acids and bases, but What are Lewis Acids and Bases?
by 005199750
Fri Dec 07, 2018 11:43 pm
Forum: Hybridization
Topic: Expanded Octet Hybridizations
Replies: 2
Views: 146

Expanded Octet Hybridizations

Why must we use d orbitals in the hybridization of atoms with expanded octets?
by 005199750
Fri Dec 07, 2018 11:40 pm
Forum: Conjugate Acids & Bases
Topic: Chemical Equations
Replies: 6
Views: 176

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,...
by 005199750
Fri Dec 07, 2018 11:35 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Factors for Acid Stength [ENDORSED]
Replies: 3
Views: 118

Factors for Acid Stength [ENDORSED]

How do size, electronegativity, and resonance influence an acid's strength?
by 005199750
Fri Dec 07, 2018 11:32 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Oxygen atoms in acid structures?
Replies: 3
Views: 192

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?
by 005199750
Fri Dec 07, 2018 11:27 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: cisplatin Ligands?
Replies: 1
Views: 50

cisplatin Ligands?

What does it mean for Ligands to be cisplatin? Do cisplatin atoms arrange a certain way around other bonded molecules?
by 005199750
Fri Dec 07, 2018 11:16 pm
Forum: Significant Figures
Topic: Sig Figs in pH and OH
Replies: 1
Views: 170

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?
by 005199750
Fri Dec 07, 2018 8:56 pm
Forum: Dipole Moments
Topic: Differences in electronegativity
Replies: 2
Views: 180

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...
by 005199750
Fri Dec 07, 2018 8:53 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Transition metals & their oxidations states
Replies: 1
Views: 238

Transition metals & their oxidations states

Why can transition metals occupy several different oxidation states? Why does this make them very useful for electron transfer?
by 005199750
Fri Dec 07, 2018 8:51 pm
Forum: Coordinate Covalent Bonds
Topic: Myoglobin
Replies: 1
Views: 163

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?
by 005199750
Fri Dec 07, 2018 8:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AX2E3 (i.e. linear) Molecular geometry
Replies: 1
Views: 92

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.
by 005199750
Fri Dec 07, 2018 8:41 pm
Forum: Hybridization
Topic: How does hybridization tell us the # of bonds?
Replies: 1
Views: 65

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...
by 005199750
Fri Dec 07, 2018 8:37 pm
Forum: Hybridization
Topic: The purpose of hybridization
Replies: 1
Views: 61

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.
by 005199750
Mon Nov 19, 2018 7:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma vs. Pi Bonds (What's the difference?)
Replies: 4
Views: 70

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?
by 005199750
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: 72

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...
by 005199750
Mon Nov 19, 2018 6:35 pm
Forum: Hybridization
Topic: Identifying types of bonds and hybridization in Lewis Structures
Replies: 3
Views: 64

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...
by 005199750
Mon Nov 19, 2018 6:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bold/Dashed Lines in Bonds
Replies: 4
Views: 68

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?
by 005199750
Mon Nov 05, 2018 4:50 pm
Forum: Lewis Structures
Topic: Lewis Structure for N2O
Replies: 7
Views: 137

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?
by 005199750
Sun Nov 04, 2018 10:52 pm
Forum: Lewis Structures
Topic: 4th & 9th groups in Lewis Structures
Replies: 1
Views: 45

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?
by 005199750
Sun Nov 04, 2018 10:42 pm
Forum: Lewis Structures
Topic: Expanded Octet Atoms/Exceptions
Replies: 2
Views: 36

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!
by 005199750
Sun Nov 04, 2018 10:40 pm
Forum: Lewis Structures
Topic: Steps for Lewis Structures
Replies: 3
Views: 68

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...
by 005199750
Sun Nov 04, 2018 10:10 pm
Forum: Lewis Structures
Topic: Lewis Structure for N2O
Replies: 7
Views: 137

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?
by 005199750
Sun Oct 21, 2018 9:13 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron Spin States?
Replies: 4
Views: 77

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...
by 005199750
Sun Oct 21, 2018 9:06 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: I'm uncertain about the Uncertainty Principle
Replies: 2
Views: 79

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...
by 005199750
Sun Oct 21, 2018 8:58 pm
Forum: Properties of Light
Topic: Using a rounded speed of light in EM problems
Replies: 4
Views: 182

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...
by 005199750
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: 65

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...
by 005199750
Thu Oct 04, 2018 10:19 pm
Forum: Significant Figures
Topic: Sig figs for Avogadro's number
Replies: 3
Views: 64

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.?
by 005199750
Thu Oct 04, 2018 10:16 pm
Forum: Significant Figures
Topic: Using Sig Figs Throughout a Problem?
Replies: 6
Views: 92

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...

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