Search found 19 matches

by Chu 3J
Mon Mar 07, 2016 1:41 am
Forum: *Complex Reaction Coordinate Diagrams
Topic: Reaction Profiles
Replies: 1
Views: 462

Reaction Profiles

In question 4.40 in the Introduction to Organic Chemistry workbook, how do we know if the reactants or products are thermodynamically stable. Also how do we determine if a reaction is kinetically controlled?
by Chu 3J
Mon Feb 29, 2016 1:25 am
Forum: *Electrophilic Addition
Topic: Mechanisms for electrophilic addition
Replies: 1
Views: 243

Mechanisms for electrophilic addition

In an electrophilic addition mechanism, how do we know which one is the nucleophile and which is the electrophile?
by Chu 3J
Sun Feb 21, 2016 10:13 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Intermediates and Catalysts in a reaction mechanism
Replies: 1
Views: 311

Intermediates and Catalysts in a reaction mechanism

How do you know if a molecule in a proposed reaction mechanism is an intermediate or a catalyst?
by Chu 3J
Mon Feb 15, 2016 1:47 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Determining the slow reaction mechanism
Replies: 1
Views: 264

Determining the slow reaction mechanism

How do you know which of the reactions in a proposed reaction mechanism is the determining/slow reaction?
by Chu 3J
Sun Feb 07, 2016 9:51 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Formula for heat
Replies: 1
Views: 266

Formula for heat

Why is q=nC (delta)t sometimes written as q=C (delta)t?
by Chu 3J
Mon Feb 01, 2016 12:07 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Battery Diagram
Replies: 1
Views: 279

Cell Battery Diagram

I am still unsure as to how the cell battery works exactly. More specifically, what is the difference between the "interface between phases" and the salt bridge?
by Chu 3J
Sun Jan 24, 2016 6:58 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: How do you find the degrees of freedom
Replies: 1
Views: 380

How do you find the degrees of freedom

What exactly are the degrees of freedom for a gas molecule and how would one calculate this number for diatomic and monatomic ideal gases?
by Chu 3J
Fri Jan 22, 2016 7:00 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy
Replies: 1
Views: 271

Gibbs Free Energy

Why is it that if "G" is a minimum then any negative value changes are always spontaneous?
by Chu 3J
Sun Jan 17, 2016 6:57 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Definition of degeneracy and relationship to entropy
Replies: 6
Views: 1695

Definition of degeneracy and relationship to entropy

I am still unsure as to what exactly degeneracy is, and how degeneracy is related to entropy.
by Chu 3J
Mon Jan 11, 2016 10:32 am
Forum: Phase Changes & Related Calculations
Topic: State Properties
Replies: 2
Views: 275

State Properties

If enthalpy is equal to heat (at constant pressure), and enthalpy is a state function, why isn't heat (q) considered a state function as well?
by Chu 3J
Sun Nov 29, 2015 11:39 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Ka2 and Ka1
Replies: 1
Views: 517

Ka2 and Ka1

I know that Ka2 is typically smaller than Ka1, but why exactly is this the case? It was mentioned in the lecture that it was because it is harder for the molecule to lose another H atom, but I am not sure why it is harder for the molecule to lose another H atom.
by Chu 3J
Sun Nov 22, 2015 11:18 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Bidentate or Polydentate
Replies: 2
Views: 413

Bidentate or Polydentate

I am confused as to why oxalato is considered bidentate, even though it has at least two lone pairs on each of the four oxygen atoms. If each oxygen atom were only able to form one of these types of bonds, wouldn't oxalato be able to donate 4 electron pairs making it a polydentate?
by Chu 3J
Sun Nov 15, 2015 11:59 pm
Forum: Naming
Topic: Written Formula to Chemical Formula
Replies: 1
Views: 217

Written Formula to Chemical Formula

When going from the chemical formula, such as [Cr(NH3)3(OH2)2(OH)]Cl, to the written formula we write triamminediaquahydroxidochromium (II) chloride, with the ligands in alphabetical order, but how do we arrange the ligands when going from the written formula to the chemical formula?
by Chu 3J
Mon Nov 09, 2015 12:32 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Gas Constant
Replies: 1
Views: 188

Gas Constant

I noticed that there were two gas constants, R=8.314 JxK^-1 x mol^-1 and R=.0821 Lxatm/molxK
which types of problems would require the first one and which types of problems would require the second constant?
by Chu 3J
Sun Nov 01, 2015 11:18 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 1
Views: 278

Ligands

I was reading Table 17.4 on page 742, I noticed that there are only ligands with either a neutral charge or negative charge, why aren't there any positively charged ligands?
by Chu 3J
Sun Oct 25, 2015 11:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Shape
Replies: 1
Views: 186

VSEPR Shape

In the lecture we determined that XeF4 had 6 regions of electron density, but when determining its 3-d shape we ignore the two lone pairs on the opposite poles of XeF4 in order to get a square planar shape. Why do we ignore the lone pairs when determining its shape?
by Chu 3J
Sun Oct 18, 2015 10:24 pm
Forum: Bond Lengths & Energies
Topic: Dissociation Energies
Replies: 1
Views: 275

Dissociation Energies

Why does the dissociation energy get smaller as the atom get bigger, wouldn't it take more energy to dissociate a large atom compared to a smaller one?
by Chu 3J
Mon Oct 12, 2015 1:14 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Dz^2 Orbital
Replies: 1
Views: 463

Dz^2 Orbital

If this orbital has a ring around it, would it still have 2 nodes like the other d orbitals?
by Chu 3J
Sun Oct 04, 2015 11:26 pm
Forum: Photoelectric Effect
Topic: Intensity's Impact on the Photoelectric Effect
Replies: 1
Views: 240

Intensity's Impact on the Photoelectric Effect

In the Chemical Principles book, it mentions that electrons are ejected regardless of the intensity, assuming that the radiation is within the threshold value. Would electrons still be ejected if the intensity was zero or negligible?

Go to advanced search