Search found 32 matches

by Kate Manganaro 1F
Sat Jun 09, 2018 12:30 pm
Forum: Lewis Acids & Bases
Topic: Protons are lewis acids?
Replies: 5
Views: 173

Re: Protons are lewis acids?

Paywand,
From the definitions given to us in class by Dr. Lavelle, Lewis acids are electron acceptors, meaning it wouldn't make sense for them to be negatively charged because a negatively charged atoms or molecules wouldn't want more electrons.
Hope this helps!
Kate Manganaro
by Kate Manganaro 1F
Sat Jun 09, 2018 12:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: ICl2- Shape
Replies: 2
Views: 7394

ICl2- Shape

Hello, I am confused on how the shape of ICl2- is linear and is not bent/angular. This molecule has 3 lone pairs, so it only seems logical that they wouldn't be distributed equally so that the two chlorines can be straight. Am I just thinking of this wrong? Can someone please explain how linear is t...
by Kate Manganaro 1F
Thu Jun 07, 2018 10:29 pm
Forum: Bronsted Acids & Bases
Topic: H3O vs H2O
Replies: 5
Views: 322

Re: H3O vs H2O

Hello,
HBr is the acid in this example and KOH is the base.
Hope this helps!
by Kate Manganaro 1F
Thu Jun 07, 2018 6:16 pm
Forum: Lewis Acids & Bases
Topic: Protons are lewis acids?
Replies: 5
Views: 173

Re: Protons are lewis acids?

Hello,
I like to think about it in terms of charges. If an acid is a proton, which is positively charged, it is an electron acceptor (electrons have a negative charge).
Hope this helps!
by Kate Manganaro 1F
Thu Jun 07, 2018 6:14 pm
Forum: Lewis Acids & Bases
Topic: Ka
Replies: 5
Views: 275

Re: Ka

Hello,
Ka is essentially a measure of how strong an acid is in a solution. It is equal to ([A-][H+])/[AH].
Hope this helps!
by Kate Manganaro 1F
Mon Jun 04, 2018 8:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How To Know When A Molecule Will Be Bent?
Replies: 4
Views: 366

Re: How To Know When A Molecule Will Be Bent?

In order to determine if the shape of a molecule is bent or angular, one needs to determine if a lone pair or lone pairs are present.
by Kate Manganaro 1F
Mon Jun 04, 2018 8:43 pm
Forum: Hybridization
Topic: basics of hybridization
Replies: 18
Views: 659

Re: basics of hybridization

Hello! I'm assuming you have a basic understanding of hybrid orbitals from the various links that other students have provided. With this assumption, I will explain a little about the way I think of things. First, I count the regions of electron density around the central atom. After doing this, you...
by Kate Manganaro 1F
Mon May 28, 2018 3:26 pm
Forum: Dipole Moments
Topic: London Forces
Replies: 7
Views: 286

London Forces

Hello,
I am quite confused on what exactly London Forces are. Do we need to be able to identify them specifically? If so, how would we do that?
Thank you!
by Kate Manganaro 1F
Mon May 28, 2018 3:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR confusion
Replies: 8
Views: 324

Re: VSEPR confusion

Hello -- VSEPR Model stands for Valence-Shell Electron-Pair Repulsion Model. For each molecule, this molecule illustrates the location of bonding electrons and lone pairs with respect to the central atom. Bonding pair electrons and lone pair electrons repel each other, so the VSEPR Model takes this ...
by Kate Manganaro 1F
Mon May 28, 2018 3:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: E
Replies: 3
Views: 127

Re: E

When denoting how many electrons there are in the VSEPR model with E (lone pair electrons) and X (bonding pair electrons), the number would always be subscript. Hope this helps!
by Kate Manganaro 1F
Mon May 28, 2018 3:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Any Other Shapes?
Replies: 7
Views: 337

Re: Any Other Shapes?

There are other possible shapes, but we would just need to know the ones in the book which Dr. Lavelle went over in class.
by Kate Manganaro 1F
Sun May 20, 2018 6:16 pm
Forum: Bond Lengths & Energies
Topic: Test 3
Replies: 8
Views: 254

Re: Test 3

Yes, we went over concepts/content from chapter three in these lectures.
by Kate Manganaro 1F
Sun May 20, 2018 6:12 pm
Forum: Lewis Structures
Topic: Where to put double bonds? [ENDORSED]
Replies: 3
Views: 146

Re: Where to put double bonds? [ENDORSED]

You place the double and triple bonds wherever necessary to make the formal charges as low as possible.
by Kate Manganaro 1F
Sun May 20, 2018 6:10 pm
Forum: Lewis Structures
Topic: Exceptions to the Octet
Replies: 5
Views: 170

Re: Exceptions to the Octet

Another thing to remember is that it is okay if Boron and the other elements in its column don't necessarily need to fill their octets.
by Kate Manganaro 1F
Sun May 13, 2018 7:41 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Equation
Replies: 3
Views: 151

Equation

In high school I learned a different equation for the formal charge. It is FC = valence e- - owned e- (the electrons that the atom has in the structure. The equation we learned in class is FC = VE - NE - 1/2 * BE. I believe you get the same answer either way, but is one equation more reliable to use...
by Kate Manganaro 1F
Sun May 13, 2018 7:29 pm
Forum: Lewis Structures
Topic: Order of Dots
Replies: 11
Views: 407

Re: Order of Dots

There's no particular order you just have to make sure that the electrons are balanced and that you use all of the valence electrons and additional electrons that you get from the problem.
by Kate Manganaro 1F
Sun May 13, 2018 7:14 pm
Forum: Resonance Structures
Topic: Resonance Structures
Replies: 5
Views: 2286

Re: Resonance Structures

In lecture on Friday one of the TA's said that Dr. Lavelle will likely ask us to do that on one or two of the problems on the test but it would be excessive to ask us on all of them.
by Kate Manganaro 1F
Sun May 06, 2018 10:45 pm
Forum: Properties of Light
Topic: Frequency and Wavelength
Replies: 3
Views: 198

Re: Frequency and Wavelength

As seen in the equation c=λ v (speed of light = wavelength * frequency), the wavelength and the frequency have an inversely proportional relationship. This means that as the wavelength gets longer, the frequency gets smaller, and vice versa.
by Kate Manganaro 1F
Sun May 06, 2018 10:40 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Switching 3d and 4s
Replies: 6
Views: 300

Re: Switching 3d and 4s

An 4s orbital has higher energy than a 3d orbital so you would write the 3d orbital before the 4s orbital. This works the same way with the 4d and 5s orbitals and so on. Hope this helps!
by Kate Manganaro 1F
Wed May 02, 2018 10:18 pm
Forum: Trends in The Periodic Table
Topic: Decrease across a period
Replies: 3
Views: 148

Re: Decrease across a period

The reasoning primarily has to do with the amount of protons. As you move across the periodic table the atomic number gets higher, for example, Oxygen=8, Fluorine=9, and Neon=10. These numbers directly correlate with the number of protons in the nucleus. Because opposites attract, the more positive ...
by Kate Manganaro 1F
Sat Apr 28, 2018 10:40 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Lobes [ENDORSED]
Replies: 4
Views: 205

Re: Lobes [ENDORSED]

We use lobes to know the general shape of the potential pathway of an electron.
by Kate Manganaro 1F
Sat Apr 28, 2018 10:36 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.1 help [ENDORSED]
Replies: 3
Views: 128

Re: 2.1 help [ENDORSED]

Hello Amanda, Susu is right, they all increase. When an electron jumps orbitals, like from s to p, the energy is increasing. This would make a yes. When this electron makes this jump, the electron goes from originally having values of n=1 and l=0 to n=2 and l=1, so this makes b and c yes. Lastly, be...
by Kate Manganaro 1F
Mon Apr 23, 2018 7:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals as states
Replies: 2
Views: 77

Orbitals as states

Today in lecture, Dr. Lavelle made an analogy about orbitals, saying that we shouldn't think of orbitals as hotel rooms that exist and that the electrons "stay in". For clarification, does this imply that the states exist because the electrons are there? Or is there some other reason that ...
by Kate Manganaro 1F
Sun Apr 22, 2018 7:58 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Formula
Replies: 4
Views: 151

Re: Rydberg Formula

I don't believe that they're interchangeable per say, but they're associated with one another.
by Kate Manganaro 1F
Sun Apr 22, 2018 6:28 pm
Forum: DeBroglie Equation
Topic: Wavelength and De Broglie Equation [ENDORSED]
Replies: 9
Views: 289

Re: Wavelength and De Broglie Equation [ENDORSED]

Both formulas are calculating wavelength, but De Broglie's equation only applies to certain things, specifically objects with mass, so not to light, because light doesn't have mass. The wavelength equation, on the other hand, can calculate the wavelength of both objects with mass and of light.
by Kate Manganaro 1F
Sun Apr 22, 2018 6:22 pm
Forum: Einstein Equation
Topic: Looking over discussion problems
Replies: 2
Views: 111

Re: Looking over discussion problems

The best formula to represent this is the kinetic energy equation, E(k)=1/2(mv^2). This is because the light wave must have a certain frequency threshold in order to eject electrons off a certain metal. This varies for various metals, but an increase of brightness of light that you know will eject t...
by Kate Manganaro 1F
Sun Apr 15, 2018 9:51 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 2
Views: 59

Re: Photoelectric Effect

I believe that in scenarios where the light intensity is extremely high it is possible but this is very unlikely so we ignore it. The reason is mainly because photons don't continue to stick to the electron, it stays for only a short period of time. Basically, photons aren't affecting electrons at t...
by Kate Manganaro 1F
Sun Apr 15, 2018 9:07 pm
Forum: Properties of Light
Topic: How do I use Planck's constant? [ENDORSED]
Replies: 4
Views: 180

Re: How do I use Planck's constant? [ENDORSED]

Planck's constant is used in the equation E=hv where E is the amount of energy, h is Planck's Constant, and v is the frequency of the wave.
by Kate Manganaro 1F
Sun Apr 15, 2018 8:57 pm
Forum: Photoelectric Effect
Topic: Planck's Constant
Replies: 4
Views: 216

Re: Planck's Constant

From my understanding, Planck's Constant, 6.626 x 10^-34 J*s is just how energy and the frequency of an electromagnetic wave are related to each other.
by Kate Manganaro 1F
Sun Apr 15, 2018 7:32 pm
Forum: SI Units, Unit Conversions
Topic: Avogadro's Number [ENDORSED]
Replies: 11
Views: 426

Avogadro's Number [ENDORSED]

So is Avogadro's Number used only when converting from moles to atoms or can it be used to convert from moles to molecules as well?
by Kate Manganaro 1F
Sun Apr 08, 2018 5:03 pm
Forum: Limiting Reactant Calculations
Topic: Actual Yield [ENDORSED]
Replies: 3
Views: 127

Actual Yield [ENDORSED]

In order to calculate the theoretical yield, we would find the limiting reactant and base it off of that, but is there any way to calculate the actual yield of a chemical reaction or will it always be given to us?
by Kate Manganaro 1F
Sun Apr 08, 2018 4:25 pm
Forum: Balancing Chemical Reactions
Topic: Catalysts [ENDORSED]
Replies: 4
Views: 168

Catalysts [ENDORSED]

Just for clarification, if a catalyst is present in a chemical reaction, it doesn't appear in the reactants or products of the chemical equation does it?

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