Search found 16 matches

by Tess McDaniel 1F
Sun Dec 10, 2017 12:21 am
Forum: Dipole Moments
Topic: Dipole Occurence
Replies: 4
Views: 444

Re: Dipole Occurence

Polarity of bonds is determined by difference in electronegativity between atoms so use the charge difference to draw the dipole vector arrows between individual atoms, then use this and the molecular geometry of the structure to determine net polarity. Also, remember that even if individual bonds a...
by Tess McDaniel 1F
Sun Dec 03, 2017 11:55 pm
Forum: Air Pollution & Acid Rain
Topic: compounds for acid rain
Replies: 3
Views: 667

Re: compounds for acid rain

I'm not sure what all the compounds that contribute are, but I know that SO2 (sulfur dioxide) is also involved in creating acid rain
by Tess McDaniel 1F
Sun Dec 03, 2017 11:52 pm
Forum: Bronsted Acids & Bases
Topic: water [ENDORSED]
Replies: 2
Views: 215

Re: water [ENDORSED]

Water can act as a base and an acid because it can dissociate into a hydronium ion and a hydroxide ion, according to the definition of lewis acids and bases hydronium ions are Lewis acids because they can accept electrons and hydroxide ions are Lewis bases because they can donate electrons.
by Tess McDaniel 1F
Sun Nov 26, 2017 4:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.11
Replies: 2
Views: 353

Re: 11.11

I was also confused on this one but I think its simply because of the powers that the concentrations are raised to. Obviously when calculating Kc we have to raise the concentrations to the power of their coefficient and so larger concentrations will be exponentially larger than smaller concentration...
by Tess McDaniel 1F
Sun Nov 26, 2017 4:02 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 11.13 Part C
Replies: 2
Views: 250

11.13 Part C

When writing reaction quotient expressions for homogeneous reactions in the gas phase is it better to write Q in terms of partial pressure of concentrations? For example in problem 11.13 part c there are no values given so it's not obvious.
by Tess McDaniel 1F
Sun Nov 19, 2017 5:28 pm
Forum: Hybridization
Topic: 3 regions of e- density
Replies: 3
Views: 339

3 regions of e- density

In my notes I wrote that if there are three regions of electron density than you will get a 4sp^3 hybridized orbital, can someone explain where the 4 coefficient comes from here?
by Tess McDaniel 1F
Sun Nov 19, 2017 5:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Double bonds vs. single bonds
Replies: 4
Views: 389

Double bonds vs. single bonds

Do double bonds take up more space in the VSEPR model than single bonds? or not because they just count as one region of electron density? By take up space I mean do they have a wider bond angle than single bonds.
by Tess McDaniel 1F
Mon Nov 13, 2017 12:00 am
Forum: Ionic & Covalent Bonds
Topic: 3.23
Replies: 3
Views: 343

Re: 3.23

Basically, losing 7 electrons would obviously be way less likely and favorable than just gaining a single electron, but the question is just saying that theoretically it's possible and that atoms want to move toward a noble gas configuration. hope that helps!
by Tess McDaniel 1F
Thu Nov 09, 2017 2:32 pm
Forum: Resonance Structures
Topic: 3.57 Resonance structures?
Replies: 2
Views: 289

3.57 Resonance structures?

In 3.57 the solutions have some structures with double bonds and some without, I'm wondering if
1. these are all equally favorable
2. if all the solution would be resonance structures even though some have double bonds changing positions and one solution doesn't have a double bond at all
by Tess McDaniel 1F
Tue Nov 07, 2017 1:30 pm
Forum: Lewis Structures
Topic: Exceptions to octet rule?
Replies: 6
Views: 742

Re: Exceptions to octet rule?

Hi! I just wanted to add that the reason why atoms in the 3rd row and below can have expanded octets is that they can utilize the d orbitals in the 3rd energy level or higher. Hope this helps clarify!
by Tess McDaniel 1F
Sun Oct 29, 2017 10:26 pm
Forum: Trends in The Periodic Table
Topic: Factors Affecting Energy of an Electron
Replies: 3
Views: 719

Re: Factors Affecting Energy of an Electron

The main factor affecting the energy of an electron that I know of is its n value (principle quantum number), electrons farther away from the nucleus with larger principle quantum numbers have greater energy. There may be other factors but as far as I know this is the most important one. Hope that h...
by Tess McDaniel 1F
Sun Oct 29, 2017 10:16 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbital Shapes [ENDORSED]
Replies: 1
Views: 179

Re: Orbital Shapes [ENDORSED]

The shape of the s orbital is a sphere and the shape of the p orbital is a "dumbbell" or in other words two lobes attached by a node. The p orbital has lobes on all three axes: x,y, and z. The shapes are important because they represent the probability of finding an electron in a part of t...
by Tess McDaniel 1F
Sun Oct 22, 2017 12:36 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Angular Momentum Quantum Number [ENDORSED]
Replies: 3
Views: 368

Angular Momentum Quantum Number [ENDORSED]

I'm really confused on the meaning of the angular momentum quantum number because in my notes I wrote that it determines "shape" but I also remember Professor Lavelle saying that orbitals are simply math functions and don't actually determine the physical location of the electron. Can some...
by Tess McDaniel 1F
Fri Oct 13, 2017 3:55 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Example Shown During Lecture
Replies: 2
Views: 297

Re: Example Shown During Lecture

I remember Dr. Lavelle said in lecture today that he wasn't going to teach the Rydberg equation because there is no physical model like the energy shell model he showed us in class that explains it, so he doesn't want to teach us something we can't understand the basis for. He did say however that w...
by Tess McDaniel 1F
Thu Oct 05, 2017 10:06 pm
Forum: Significant Figures
Topic: Clarification
Replies: 4
Views: 391


Just to clarify, in general do I want to maintain as many sig figs as possible all the way up to finding my answer and then shorten it to the correct number of sig figs? Or are we supposed to maintain the correct number of sig figs throughout the problem? thank you!
by Tess McDaniel 1F
Thu Oct 05, 2017 10:03 pm
Forum: Balancing Chemical Reactions
Topic: Writing chemical formulas [ENDORSED]
Replies: 5
Views: 667

Re: Writing chemical formulas [ENDORSED]

I remember Prof Lavelle saying in class that for this test you won't need to generate a chemical formula given just the name because we haven't learned nomenclature rules yet. He did say that we will need to know that by the next test I think though. Hope that helps!

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