Search found 12 matches

by Lauren_Johnston_3F
Fri Mar 17, 2017 11:43 pm
Forum: Balancing Redox Reactions
Topic: How to determine Galvanic Cell molecules
Replies: 2
Views: 401

Re: How to determine Galvanic Cell molecules

For the problem on the old final in course reader, you use the equation Ecell=Ecathode-Eanode and whichever combo of half-reactions makes the largest Ecell (using the half reaction's Ecell from the chart in the book) is the one you use. So basically you find the biggest positive Ecell minus the bigg...
by Lauren_Johnston_3F
Sun Mar 12, 2017 7:26 pm
Forum: *Alkanes
Topic: Tert-butyl
Replies: 3
Views: 485

Re: Tert-butyl

Yes, it can be drawn in a formation that looks kind of like a pitchfork with the angles less than 90 degrees. I just think all that matters is that they are arranged in a manner in which there is one carbon (that is not part of the main chain) connected to three CH3's, so basically the angle does no...
by Lauren_Johnston_3F
Sun Mar 05, 2017 7:48 pm
Forum: *Alkanes
Topic: Prefixes & Alphabetical Order
Replies: 2
Views: 333

Re: Prefixes & Alphabetical Order

The prefixes cyclo-, iso-, and neo- are considered part of the group name so they are
Ignore the prefixes di-, tri-¸tetra-, tert-, sec-, etc., when alphabetizing.
by Lauren_Johnston_3F
Sun Feb 26, 2017 7:43 pm
Forum: *Nucleophiles
Topic: Nucleophile reactivity
Replies: 1
Views: 259

Re: Nucleophile reactivity

The nucleophilicity increases as the charge of the atom it is attached to decreases.The nucleophilicity increases as you increase the basicity. So as you go across the periodic table from right to left, nucleophilicity also increases. Nucleophilicity increases as you go down the periodic table.
by Lauren_Johnston_3F
Sun Feb 26, 2017 7:38 pm
Forum: *Organic Reaction Mechanisms in General
Topic: "No charge separation" meaning? [ENDORSED]
Replies: 3
Views: 5537

Re: "No charge separation" meaning? [ENDORSED]

I believe it is the space between particles of opposite charges, but I am not entirely sure.
by Lauren_Johnston_3F
Sun Feb 19, 2017 9:01 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Intermediates in a reaction mechanism
Replies: 1
Views: 253

Intermediates in a reaction mechanism

The reaction NO2(g) + CO(g) → NO(g) + CO2(g) is thought to occur by the following mechanism: Step 1: NO2(g) + NO2(g) → NO3(g) + NO(g) Step 2: NO3(g) + CO(g) → NO2(g) + CO2(g) Which of the following species is an intermediate? a. NO2 d. CO2 b. NO e. This mechanism has no intermediates. c. NO3
by Lauren_Johnston_3F
Sun Feb 12, 2017 2:46 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: homework 14.35
Replies: 2
Views: 330

Re: homework 14.35

The solutions manual is incorrect. On the course website there is a link that says solution manual errors and 14.35 B is on there. And yes I got the same answer as you and it is the same as the one on the corrections link.
by Lauren_Johnston_3F
Sun Feb 05, 2017 8:14 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: galvanic cell
Replies: 1
Views: 273

Re: galvanic cell

A galvanic cell converts chemical energy to work and be can be self-contained and portable, so they can be used as batteries and fuel cells. A battery is a galvanic cell (or a series of galvanic cells) that contains all the reactants needed to produce electricity. While a fuel cell is a galvanic cel...
by Lauren_Johnston_3F
Sun Jan 29, 2017 4:27 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacities Constant Pressure vs. Volume
Replies: 2
Views: 366

Re: Heat Capacities Constant Pressure vs. Volume

They are different because the molecules have different degrees of freedom, which means they have different types of motions in the system. It may be used on the quiz, but you probably won't have to calculate it itself.
by Lauren_Johnston_3F
Sun Jan 22, 2017 6:58 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Problem 8.73 a
Replies: 1
Views: 275

Problem 8.73 a

Use the bond enthalpies in Tables 8.6 and 8.7 to estimate the reaction enthalpy for:

a) 3 C2H2 (g) ---> C6H6 (g)

In the solutions manual, the C-H bond enthalpies and H-H bond enthalpy in this reaction are not used to estimate the reaction enthalpy. Why is this?
by Lauren_Johnston_3F
Sun Jan 22, 2017 5:33 pm
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: Relationship between W and Entropy
Replies: 1
Views: 363

Re: Relationship between W and Entropy

Boltzmann's equation is a probability equation relating the entropy S of an ideal gas to the quantity W, the number of real microstates corresponding to the gas' macrostate. It shows the relationship between entropy and the number of ways the atoms or molecules of a thermodynamic system can be arran...
by Lauren_Johnston_3F
Sun Jan 15, 2017 10:05 pm
Forum: Phase Changes & Related Calculations
Topic: Temp in Phase Change
Replies: 3
Views: 387

Re: Temp in Phase Change

Temperature is the average kinetic energy of particles and indicates the random motion of particles. Heat is a form of energy that transfers between two substances due to a temperature difference. During a phase change heat is used to break the bonds between molecules to change the state of the subs...

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