Search found 22 matches

by jonathanshi_1A
Sun Mar 19, 2017 11:06 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7741
Views: 1058668

Re: Post All Chemistry Jokes Here

If H2O is water, and H2O2 is peroxide, what is H2O4?
Drinking
by jonathanshi_1A
Sat Mar 18, 2017 5:11 pm
Forum: *Cycloalkenes
Topic: Question about 1,6-dichlorocyclohexene
Replies: 1
Views: 706

Question about 1,6-dichlorocyclohexene

On page 102 of the course reader, I'm confused why we wouldn't name it 1,6-dichloro-1-cyclohexene. In other organic molecules, we separate the substituent from the main carbon chain.
by jonathanshi_1A
Sun Mar 12, 2017 11:13 pm
Forum: *Electrophilic Addition
Topic: Transition State Question
Replies: 1
Views: 545

Transition State Question

In regards to transition states, I'm a bit confused on to what exactly happens per step. For example, in the electrophilic addition reaction on page 85 between Cholesterol and HBr, he first transition state describes the breaking of the double bond, the formation of a bond to H, and the breaking of ...
by jonathanshi_1A
Mon Mar 06, 2017 5:52 pm
Forum: *Cycloalkenes
Topic: Tert-Butyl vs Isobutyl
Replies: 1
Views: 366

Tert-Butyl vs Isobutyl

On page 96 of the course reader, there is a butyl substituent on the cyclohexane base. I was wondering why it is called tert-butyl instead of isobutyl. I know that the neo- prefix is only for 5 carbons and up, but I thought iso- was used for 4 carbons and down.
by jonathanshi_1A
Sun Mar 05, 2017 10:15 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Dipole Moment Question
Replies: 1
Views: 390

Dipole Moment Question

In a dipole moment collision between for example, C2Cl4 and Br2 in the course reader, one of the Br becomes slightly positive due to the fact that there is electron repulsion from the nucleophile pi-bond of the carbons in C2Cl4, causing a dipole moment in Br2. However, due to the fact that one Br be...
by jonathanshi_1A
Sun Feb 26, 2017 11:59 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7741
Views: 1058668

Re: Post All Chemistry Jokes Here

When the chemical kinetics specialist is asked why he ran slowly, his reply was “I always wanted to be the significant rate determining step."
by jonathanshi_1A
Sun Feb 19, 2017 9:54 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Difference between Delta H and q?
Replies: 3
Views: 12283

Difference between Delta H and q?

I'm a little confused as to the difference between the two, as they both have to do with heat.
by jonathanshi_1A
Sun Feb 12, 2017 10:52 pm
Forum: Balancing Redox Reactions
Topic: H20, HO-, and H+ When Balancing
Replies: 1
Views: 285

Re: H20, HO-, and H+ When Balancing

In an acidic solution: 1. Balance all non-O/H atoms. 2. Balance O atoms with H2O. 3. Balance H+ atoms with H+. In a basic solution: 1. Balance all non-O/H atoms. 2. Balance O atoms with H2O. 3. Balance H+ atoms with H+. 4. Neutralize H+ atoms with OH- to create H2O and add to both sides equally (the...
by jonathanshi_1A
Sun Feb 05, 2017 10:35 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Purpose of Hydrogen Electrode
Replies: 1
Views: 239

Purpose of Hydrogen Electrode

I understand that the galvanic cell changes chemical energy to electrical energy with an anode and cathode; however, I am confused with the purpose of the hydrogen electrode. Don't we normally measure the e- transfer of the system with normal anode/cathodes?
by jonathanshi_1A
Sun Jan 29, 2017 9:12 pm
Forum: Calculating Work of Expansion
Topic: Reversible vs Irreversible Expansion
Replies: 1
Views: 265

Reversible vs Irreversible Expansion

I'm a little confused with what a reversible expansion is. I understand how to do the equations, but conceptually I'm not sure what it means to expand reversibly.
by jonathanshi_1A
Tue Jan 17, 2017 12:16 pm
Forum: Phase Changes & Related Calculations
Topic: Phase Change Question
Replies: 1
Views: 312

Phase Change Question

In the Phase Change Diagram, the length of the s&l is shorter than the length of l&g. Why does it take more energy to break the bond from liquid to gas than from solid to liquid?
by jonathanshi_1A
Sat Dec 03, 2016 9:35 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Confusion with n, l, ml, ms.
Replies: 2
Views: 650

Confusion with n, l, ml, ms.

On the midterm there was a question that asked how many elements have valence electrons with the quantum numbers n=2 and l=1. Looking on the table, there are 6 elements that fulfill that requirement; however, what if it said n=2 and l=0? Boron, carbon, nitrogen, oxygen, fluorine, and neon all have v...
by jonathanshi_1A
Sun Nov 27, 2016 9:09 pm
Forum: Polyprotic Acids & Bases
Topic: Protonation Question
Replies: 1
Views: 503

Protonation Question

Regarding Polyprotic Acids/bases, do you always assume that they have 2 protonations? I understand that the 3rd protonation is extremely hard because it's harder to lose a H+ ion from a negatively charged ion.
by jonathanshi_1A
Sun Nov 20, 2016 8:52 pm
Forum: Lewis Acids & Bases
Topic: Lewis Acids & Bases vs Bronsted Acids & Bases
Replies: 2
Views: 445

Re: Lewis Acids & Bases vs Bronsted Acids & Bases

Lewis Acid/Base: An acid accepts electrons, a base donates an electron. Bronsted Acid/Base: An acid donates a proton (H+ ion), a base accepts a proton. I'm familiar with these definitions, and I hope this helps. I know that it's possible for a reaction to be a Lewis acid/base reaction and not a Bron...
by jonathanshi_1A
Sun Nov 13, 2016 11:51 pm
Forum: Sigma & Pi Bonds
Topic: orbitals used in bonding
Replies: 1
Views: 487

Re: orbitals used in bonding

With what you've said, I would agree that oxygen and carbon would would have a pi(O2p, C2p) due to the fact that both atoms have 3 areas of electron density and therefore reserve the last orbital for the pi bond. If this is wrong, someone please let me know!
by jonathanshi_1A
Sun Nov 13, 2016 11:44 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Antibonding
Replies: 1
Views: 238

Antibonding

So I understand that antibonding is when two atomic orbitals are out of phase, but what does that really mean - and can someone also explain the meaning of it in the MO diagram?
by jonathanshi_1A
Sun Nov 06, 2016 5:50 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Definition of a Ligand [ENDORSED]
Replies: 3
Views: 608

Definition of a Ligand [ENDORSED]

I'm a bit confused on what a ligand is. In the diagram that Dr. Lavelle drew in class, there was 2 chlorine and 4 water molecules bound to a nickel atom. Are the water molecules also considered ligands, as they are an electron donor? In addition, regarding ligand bonding sites, does the naming of &q...
by jonathanshi_1A
Sun Oct 30, 2016 11:05 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Questions about orbitals? [ENDORSED]
Replies: 1
Views: 303

Questions about orbitals? [ENDORSED]

I'm a little confused about the orientation of orbitals. When atoms have more than one shell of, for example p orbitals, does it have the two lobes more than once at the same time?
by jonathanshi_1A
Fri Oct 21, 2016 11:27 pm
Forum: Dipole Moments
Topic: Do Dipole Moments affect Bond Strength?
Replies: 2
Views: 1972

Do Dipole Moments affect Bond Strength?

I understand that the width of an atom, # of bonds, and # of lone pairs can affect the strength of a bond; however, does the difference in electronegativity affect the strength of a bond as well, as it increases the ionic character of a bond?
by jonathanshi_1A
Sun Oct 16, 2016 7:30 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Radius
Replies: 2
Views: 293

Re: Ionic Radius

Hi Catherine, I did some research because I was confused with the same concept. What I found from a website said: Unlike a ball, an atom doesn't have a fixed radius. The radius of an atom can only be found by measuring the distance between the nuclei of two touching atoms, and then halving that dist...
by jonathanshi_1A
Fri Oct 07, 2016 4:48 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals [ENDORSED]
Replies: 9
Views: 981

Re: Orbitals [ENDORSED]

Can someone please clarify the statement mentioned in lecture that electrons are the orbitals? I’m a bit confused because it was also mentioned electrons are in the orbitals. In a slightly different perspective, I think what he meant by "electrons are the orbitals" is the fact that the be...
by jonathanshi_1A
Fri Sep 30, 2016 11:55 pm
Forum: Student Social/Study Group
Topic: Hedrick Summit Study Group Chem 14A
Replies: 29
Views: 2659

Re: Hedrick Summit Study Group Chem 14A

Hi everyone!

I'd love to work in the Hedrick Hall Fireside Lounge. When is a good time for you guys? I'm free most nights next week!
Please let me know if someone is interested!

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