Search found 15 matches

by James Cheng 3I
Thu Mar 10, 2016 5:37 pm
Forum: *Electrophiles
Topic: Why is CO2 an electrophile
Replies: 1
Views: 967

Why is CO2 an electrophile

If anything, shouldn't it be a nucleophile? It has 2 double bonds for the carbons and oxygens, and the oxygens also have lone pairs. Wouldn't that mean it is electron rich, aka a nucleophile?
by James Cheng 3I
Fri Mar 04, 2016 4:30 pm
Forum: *Cyclopropanes and Cyclobutanes
Topic: Cyclobutane's Butterfly conformation
Replies: 1
Views: 495

Cyclobutane's Butterfly conformation

For simplicity's sake, say the top left carbon is 1, top right is 2, bottom left is 3, and bottom right is 4 in a 2 dimensional view. Would there be any way to know if it is carbon 1/3 pointing upwards while 2/4 are pointing downwards, or if carbon 2/4 are pointing upwards and 1/3 are pointing downw...
by James Cheng 3I
Sat Feb 27, 2016 7:03 pm
Forum: *Nucleophiles
Topic: Nucleophile strength?
Replies: 2
Views: 475

Re: Nucleophile strength?

Yes, there are varying strengths for nucleophiles. In general, the more electronegative something is, the weaker its nuceophile strength will be. Also, as electron density increases, so does its nucleophile properties.
by James Cheng 3I
Sun Feb 21, 2016 1:12 am
Forum: *Electrophiles
Topic: AlCl3
Replies: 3
Views: 1659

Re: AlCl3

Aluminum wants an octet to be more stable, and it accomplishes this by hopefully gaining electrons from an outside source, aka the definition of an electrophile.
by James Cheng 3I
Sun Feb 14, 2016 9:09 pm
Forum: First Order Reactions
Topic: Psuedo 1st rat laws?
Replies: 1
Views: 333

Re: Psuedo 1st rat laws?

I think you can graph either, as k prime is just a multiplier of k, so at most the slope is shifted to something steeper/ shallower
by James Cheng 3I
Sat Feb 06, 2016 11:55 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Writing Cell Diagrams
Replies: 1
Views: 355

Re: Writing Cell Diagrams

I think h2 always has to be on the left of h+ if it is on the anode because h+ is the oxidized species, and products should be on the right side in those reactions
by James Cheng 3I
Sat Jan 30, 2016 12:05 am
Forum: Balancing Redox Reactions
Topic: Voltage changing while balancing equations?
Replies: 2
Views: 632

Voltage changing while balancing equations?

When you are balancing half reactions why does the voltage potential not change when you multiply by a number to balance the equations? Why is it not like enthalpy?
by James Cheng 3I
Sat Jan 23, 2016 6:48 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Expansion in a vacuum
Replies: 2
Views: 574

Expansion in a vacuum

For expansion work, what is the driving force for expansion and compression of a container if it is in a vacuum? As we know, in a vacuum, Pexternal = 0, so what would cause the container to change its volume?
by James Cheng 3I
Thu Jan 14, 2016 9:42 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Question about Closed Systems vs Isolated System
Replies: 2
Views: 476

Question about Closed Systems vs Isolated System

For 8.1, they say that coffee in a high quality thermos bottle is isolated and not a closed system. Hypothetically, shouldn't the thermos give even a very very very small amount of heat off to the surroundings, thus making it a closed system? Could we assume this small amount of heat be so negligibl...
by James Cheng 3I
Fri Jan 08, 2016 8:58 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat exchange question
Replies: 1
Views: 319

Heat exchange question

For questions like where one substance loses heat to another, such as a hot piece of copper being put into cold water, why do we set up the equation as mc delta t = -mc delta t, and not mc delta t = mc delta t? In other words, why is it heat lost of substance one = - heat gained of substance two?
by James Cheng 3I
Sun Oct 25, 2015 9:19 pm
Forum: Octet Exceptions
Topic: Sulfur and its expanded octet property
Replies: 2
Views: 738

Sulfur and its expanded octet property

I understand that sulfur is able to have an expanded octet because it begins to using its 3d orbitals to bond. However, does that mean there is a limit to the number of bonds it has, specifically 9 (1 from 3s, 3 from 3p, and 5 from 3d)? In other words, can sulfur exceed SX9, with X being another ele...
by James Cheng 3I
Tue Oct 13, 2015 1:12 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Outer shell of Cr 2+
Replies: 1
Views: 477

Outer shell of Cr 2+

I understand that we take 2 electrons, 1 from the 4s and 1 from the 3d, out due to the charge of the ion; however, why is the number of electrons in the outer shell 4, rather than 12? There are 2 electrons in the 3s, 6 in the 3p, and 4 in the 3d. Since the most outer orbital is 3, why isn't it the a...
by James Cheng 3I
Sat Oct 03, 2015 1:31 am
Forum: Photoelectric Effect
Topic: Precision on the frequencies
Replies: 2
Views: 419

Precision on the frequencies

As we all know, energy levels are quantised so there can be no 1.45923195921395 energy level. Does that mean that the frequencies of the waves shot at the electrons must be precisely the value in which the atoms could get excited, or could it be off just slightly and still energize the electrons? In...

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