Search found 21 matches

by Kelly Duong 2D
Tue Mar 08, 2016 10:26 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Drawing H's
Replies: 2
Views: 345

Drawing H's

How do you know what type of C-H bonds to draw (axial or equatorial hydrogens) and how many of each to draw in a structure?
by Kelly Duong 2D
Tue Mar 08, 2016 10:14 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Degeneracy
Replies: 1
Views: 300

Re: Degeneracy

When the problem asks for one mol
by Kelly Duong 2D
Sun Mar 06, 2016 6:37 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalyst
Replies: 1
Views: 332

Catalyst

How can you determine what the catalyst is given the reaction? For example, on page 78 in the course reader, we are given NO(g) + 1/2 02(g) ---> NO2(g) NO2(g) --->NO(g) + O(g) O2 (g) + O(g) ---> O3(g) Gives 3/2 O2(g) ---> O3(g) If we weren't told that nitric oxide was the catalyst, how would we have...
by Kelly Duong 2D
Sun Feb 28, 2016 6:55 pm
Forum: *Organic Reaction Mechanisms in General
Topic: transition states
Replies: 1
Views: 226

transition states

How do you figure out how many transition states there are in a reaction?
by Kelly Duong 2D
Sun Feb 28, 2016 6:23 pm
Forum: *Nucleophiles
Topic: Nucleophile and electrophile
Replies: 1
Views: 363

Nucleophile and electrophile

When a nucleophile reacts with an electrophile, how do you know what breaks off? For example, when a nucleophile reacts with CH3Cl, why is it that Cl breaks off and not H?
by Kelly Duong 2D
Tue Feb 16, 2016 9:06 pm
Forum: General Rate Laws
Topic: Unique rate of reaction
Replies: 2
Views: 450

Re: Unique rate of reaction

How do we know which coefficient to look at though?
by Kelly Duong 2D
Tue Feb 16, 2016 8:29 pm
Forum: General Rate Laws
Topic: Unique rate of reaction
Replies: 2
Views: 450

Unique rate of reaction

What is a unique rate of a reaction? How do you find it?
For example, in the book ch.15 #3c, it asks for the unique rate of the reaction 2NO2------>2NO+O2. Knowing that the rate is 6.5x10^-3 mol/LS, why did they divide by 2 to get the unique rate of 3.3x10^-3 mol/LS???
by Kelly Duong 2D
Tue Feb 09, 2016 8:30 pm
Forum: Balancing Redox Reactions
Topic: pairs of redox couples
Replies: 3
Views: 497

pairs of redox couples

When given pairs of redox couples, how do you know which one should be the reduction/oxidation half reaction? For example, in WINTER 2011 Q6, given F2/F- with a standard reduction potential of +2.87V & RB+/RB with a standard reaction potential of -2.93V, they made fluorine the cathode/reduction ...
by Kelly Duong 2D
Mon Feb 08, 2016 12:10 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Homework: Chatper 9 #5
Replies: 1
Views: 582

Homework: Chatper 9 #5

The problem is: What is the total change of process in which 40.0kJ of energy is transferred as heat from a large reservoir at 800k to one at 200k? In the answers, it says ∆S=-40000J/800K and ∆S=+40000j/800K and then you add them to get +150j/K. My question is how do you know you know which is negat...
by Kelly Duong 2D
Mon Feb 01, 2016 8:36 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst equation variation
Replies: 1
Views: 263

Re: Nernst equation variation

The equation is right. An equivalent equation is .
so if you plug that in the first equation for ln, you get . The 2.303 replaces the ln! Hope that made sense and helped!
by Kelly Duong 2D
Tue Jan 26, 2016 10:45 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: entropy
Replies: 1
Views: 340

entropy

Does entropy increase as the molecule size gets bigger?
by Kelly Duong 2D
Thu Jan 21, 2016 6:02 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated System
Replies: 5
Views: 395

Re: Isolated System

As long as it is an isolated system, ΔU should be zero because no heat can flow in or out, and no external force can be applied.
by Kelly Duong 2D
Thu Jan 14, 2016 10:00 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: bomb calorimeter
Replies: 2
Views: 301

bomb calorimeter

Can someone explain why the combustion of glucose in a bomb calorimeter is considered isolated? Why isn't it considered closed?
by Kelly Duong 2D
Thu Jan 07, 2016 10:34 pm
Forum: Phase Changes & Related Calculations
Topic: Temperature Dynamics in Enthalpies
Replies: 6
Views: 725

Re: Temperature Dynamics in Enthalpies

Steam burns more severely than water because it undergoes a phase change and releases more energy. For example, when steam at 100 C comes into contact with your skin, which is at a lower temperature, it undergoes a phase change from vapor to liquid and this phase change releases heat into the skin. ...
by Kelly Duong 2D
Tue Nov 24, 2015 6:33 pm
Forum: Empirical & Molecular Formulas
Topic: Fall 2015 Quiz 1 #7 video submission
Replies: 1
Views: 333

Fall 2015 Quiz 1 #7 video submission

Video submission by Kelly Duong (Discussion 3D) and Nina Cherian (Discussion 1E)
by Kelly Duong 2D
Tue Nov 17, 2015 3:26 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Concentration vs. Amount
Replies: 1
Views: 679

Re: Concentration vs. Amount

Yes it should be asking for the same thing because for an example, if the concentration increases, the # of mols increases which mean the amount is increasing. If they're asking for the effect of an increase/decrease in concentration of a reactant/product, that should be the same thing as asking for...
by Kelly Duong 2D
Mon Nov 16, 2015 5:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: stability of atoms/molecules at equilibrium
Replies: 1
Views: 255

stability of atoms/molecules at equilibrium

How do you determine which atom/molecule is more thermodynamically stable? For example, in the HW, 11.45 part c, it asks us to determine whether Cl2 or F2 is more thermodynamically stable based on our results from part a and b (where we found the concentrations of the reactants/products at equilibri...
by Kelly Duong 2D
Mon Nov 16, 2015 12:44 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: chemical equilibrium expressions
Replies: 1
Views: 304

chemical equilibrium expressions

When writing the Kc equilibrium expression, how do you know whether to write it as concentration [__] or pressure (P__)?
by Kelly Duong 2D
Tue Nov 03, 2015 9:32 pm
Forum: Bond Lengths & Energies
Topic: Bond lengths and molecular orbital theory
Replies: 4
Views: 1416

Re: Bond lengths and molecular orbital theory

You draw out the M.O. Diagrams to figure out the bond order. Once you figured out the bond order, you know what kind of bond it is. B.O. 1 is a single bond, B.O. 2 means a double bond and so on. Triple bonds are the shortest and single bonds are the longest.
by Kelly Duong 2D
Tue Nov 03, 2015 9:25 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: lone pairs in molecular orbitals
Replies: 3
Views: 396

lone pairs in molecular orbitals

When you are drawing the molecular orbital diagram, how do you know which orbital the lone e- goes into? For example, in NO there is a lone e-. Do you put it in the pi2Px* orbital or pi2Py* orbital? Or does it not matter which of the two it goes into?
by Kelly Duong 2D
Wed Oct 28, 2015 8:06 pm
Forum: Empirical & Molecular Formulas
Topic: Radical Molecule
Replies: 2
Views: 478

Re: Radical Molecule

The unpaired electron is usually placed in the Lewis Dot Structure so that each element in the structure will have the lowest formal charge possible. For example, in NO there's 11 e- (N has 5e- and O has 6e-). Nitrogen forms a double bond with oxygen to N=O (with 2 pairs of e- pairs attached to O &a...

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