Search found 16 matches

by Jason118
Tue Mar 08, 2016 10:33 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: WInter 2011 Final Q1A
Replies: 1
Views: 374

Re: WInter 2011 Final Q1A

Delta T is just Tf-Ti. Final temperature is 100C (boiling) and then the initial temperature is 25C.
by Jason118
Sat Feb 27, 2016 4:18 pm
Forum: *Alkanes
Topic: Quiz 3 Preparation
Replies: 1
Views: 167

Quiz 3 Preparation

For the first quiz 3 preparation, question 5, why is the name of the compound 3-bromo-1-iodocyclohexane, instead of 1-bromo-3-iodocyclohexane? "Bromo" comes alphabetically first then "iodo" so shouldn't "bromo" get the prefix "1"?
by Jason118
Sun Feb 21, 2016 6:26 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Reaction Profiles
Replies: 1
Views: 361

Re: Reaction Profiles

The two terms are interchangeable. In the course reader there are two reaction profiles that have the y-axis as free energy and then in the book there are reaction profiles that have the y-axis as potential energy.
by Jason118
Mon Feb 15, 2016 10:20 am
Forum: Zero Order Reactions
Topic: Plotting first and zero order
Replies: 1
Views: 370

Re: Plotting first and zero order

When plotting zero order, the Y-axis is [A], but in first order, the Y-axis is ln[A]. The X-axis in both is time.
by Jason118
Thu Feb 11, 2016 12:46 pm
Forum: General Rate Laws
Topic: Coefficients
Replies: 1
Views: 406

Re: Coefficients

Not exactly sure what you're asking but I know that the powers on the concentration terms in a rate law are not the stoichiometric coefficients from the balanced equation.
by Jason118
Wed Feb 03, 2016 8:19 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 14.11 Going from cell diagram to reaction (and vice versa)
Replies: 1
Views: 262

14.11 Going from cell diagram to reaction (and vice versa)

How does one go from cell diagrams to reaction formulas when there are two elements between the bars? Problem 14.11C has Ce4+ and Ce3+ in the same set of bars . . . what does that mean and how does that translate into the reaction formula?
by Jason118
Wed Jan 27, 2016 12:35 am
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Residual entropy
Replies: 1
Views: 403

Re: Residual entropy

The formula for residual entropy is S= K lnW. Where K is Boltzmann's constant (1.381*10^-23 J/K) and W is the number of variations that the molecule can have. In this problem, there are 6 possible variations of Bromobenzene (the Br rotates around the ring) but since there is 1 mol of it, it is 6^6.0...
by Jason118
Mon Jan 25, 2016 2:02 am
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Residual
Replies: 2
Views: 416

Re: Residual

Residual entropy is the entropy of a substance as it reaches 0 Kelvin. The book calls it statistical entropy but they are the same thing. Residual entropy calculates the number of states for a system that is close to zero energy, so as entropy approaches zero, energy approaches zero as well, except ...
by Jason118
Fri Jan 22, 2016 1:55 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: What Temperature to use in equations
Replies: 1
Views: 261

Re: What Temperature to use in equations

You only use that formula in a isothermal process, in which case temperature is fixed. There wouldn't be a final or initial temperature.
by Jason118
Tue Jan 12, 2016 4:49 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Quiz Prep 1: Winter 2014
Replies: 1
Views: 248

Quiz Prep 1: Winter 2014

Q3 in the first quiz prep of the workbook. I balanced the equation and then calculated the kJ needed to break all the bonds and form all the bonds. My calculations arent matching up with the answers in the key. I'm not sure if my use of the coefficients are wrong or what not. Anyone know how to prop...
by Jason118
Mon Jan 11, 2016 2:47 pm
Forum: Phase Changes & Related Calculations
Topic: Change from Graphite to Diamond
Replies: 2
Views: 407

Re: Change from Graphite to Diamond

Graphite forming into diamond is an exothermic process because more bonds are being formed. At standard conditions (25C and 1 atm), graphite is more stable, but at high temperatures and pressures, diamond is more stable.
by Jason118
Fri Nov 27, 2015 5:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Video: Using the ICE Box
Replies: 1
Views: 292

Video: Using the ICE Box

Video on chemical equilibrium, in particular, the the use of the ICE box.
by Jason118
Tue Nov 17, 2015 8:47 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Diethylenetriamine
Replies: 2
Views: 439

Re: Diethylenetriamine

Diethylenetriamine is a bidentate which means it can bind at 2 sites.
by Jason118
Fri Nov 06, 2015 1:46 pm
Forum: Naming
Topic: Coordination Compound and Coordination Complex
Replies: 2
Views: 303

Re: Coordination Compound and Coordination Complex

Coordination compounds are called such because there are compounds that are coordinated to a transition metal. And coordination complexes are called such because they are Lewis acid-base complexes. It's two different names for the same thing.
by Jason118
Sat Oct 24, 2015 5:12 pm
Forum: Lewis Structures
Topic: carbon bonding with oxygen
Replies: 1
Views: 344

Re: carbon bonding with oxygen

In carbon monoxide there must be a triple bond between oxygen and carbon because of the number of electrons. If there was a double bond, you would need 12 electrons, but there are only 10 electrons in carbon monoxide.
by Jason118
Tue Oct 20, 2015 7:57 pm
Forum: Photoelectric Effect
Topic: Help with Chem Problem!
Replies: 4
Views: 2309

Re: Help with Chem Problem!

v = E/h
for Cs: v = 4.71 x 10^14 Hz
for Ag: v = 1.15 x 10^15 Hz
for K: v = 5.54 x 10^14 Hz
for Y: v = 4.38 x 10^14 Hz

Range of ultraviolet light frequency is 7.5 x 10^14 Hz - 3 x 10^17 Hz, so the only metal that is in the range is Ag.

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