Search found 18 matches

by Caroline Cox 1H
Sun Mar 18, 2018 11:18 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: n: negative or positive
Replies: 2
Views: 382

Re: n: negative or positive

Assuming you are talking about the equation dGo=-nFEo, the value of n is never negative as it corresponds to the number of electrons, not the charge of those electrons.
by Caroline Cox 1H
Sun Mar 18, 2018 11:16 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cell diagram placement
Replies: 1
Views: 191

Re: cell diagram placement

A double vertical line represents the salt bridge with the anode on the left and the cathode on the right. A single vertical line represents a phase change, while a comma is used when they are in the same state.
by Caroline Cox 1H
Sun Mar 18, 2018 11:14 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: change in volume and then temperature
Replies: 1
Views: 198

Re: change in volume and then temperature

Yes, entropy is a state function, so you can separate this problem into two parts then add them together.
by Caroline Cox 1H
Sun Mar 11, 2018 11:08 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate constant
Replies: 6
Views: 197

Re: Rate constant

The reaction rate is the actual rate of the reaction occurring while the rate constant is a value you multiply by the current concentration of the reactant in order to get the reaction rate.
by Caroline Cox 1H
Sun Mar 11, 2018 11:04 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Intermediates
Replies: 6
Views: 196

Re: Intermediates

Yes, even though it is not in step 3 it would still be considered an intermediate because an intermediate is any transient species in a multi step reaction. It does not need to be in all of the steps.
by Caroline Cox 1H
Sun Mar 11, 2018 11:01 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Intermediates
Replies: 2
Views: 131

Intermediates

Is there any way for us to determine the intermediates of a particular reaction and how many intermediates a reaction will have, or does that information have to be given to us?
by Caroline Cox 1H
Sun Mar 04, 2018 9:52 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Friday Lecture
Replies: 5
Views: 171

Re: Friday Lecture

Yes, it is because CO2 is zero order and therefore is not a factor that determines rate (aka not in the slow step).
by Caroline Cox 1H
Sun Mar 04, 2018 9:51 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Test 2 Q5
Replies: 7
Views: 314

Re: Test 2 Q5

The reducing power of an element is its ability to reduce other substances.
by Caroline Cox 1H
Sun Mar 04, 2018 9:48 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Reaction Mechanism
Replies: 2
Views: 107

Re: Reaction Mechanism

The reaction mechanism is a series of step by step simple reactions that take place to eventually form the overall reaction.
by Caroline Cox 1H
Sun Feb 25, 2018 10:42 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Dissolving [ENDORSED]
Replies: 3
Views: 149

Re: Dissolving [ENDORSED]

To determine if a metal will dissolve in a solution, you need to look at the redo reaction, separate it into two half reactions to balance, and then calculate the E of the cell. From there, you use this value to calculate the deltaGo. If this is negative, the forward reaction is spontaneous, so if t...
by Caroline Cox 1H
Sun Feb 25, 2018 10:35 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Midterm Q5
Replies: 2
Views: 186

Re: Midterm Q5

Step one is an adiabatic process which means that q=0 and therefore deltaU = w. From here, we use the equation w=-Pext*deltaV and plug in the values to get the number of Joules. For step 2, we are returning to the original internal energy, so deltaU is the same as the value we just calculated for st...
by Caroline Cox 1H
Sun Feb 25, 2018 10:30 pm
Forum: Calculating Work of Expansion
Topic: Midterm 4A
Replies: 3
Views: 142

Re: Midterm 4A

For this problem, you would use the equation w = -Pext * deltaV to solve for the number of Joules because we are looking for the work done when a system expands against a constant external pressure.
by Caroline Cox 1H
Sun Feb 18, 2018 11:11 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge
Replies: 2
Views: 108

Salt Bridge

I understand why a salt bridge is necessary for a cell, but what exactly is it made of usually?
by Caroline Cox 1H
Sun Feb 18, 2018 11:09 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge
Replies: 4
Views: 135

Re: Salt Bridge

Without a salt bridge, there would be a charge buildup as electrons are transferred from one beaker to another. A salt bridge allows ions to flow, so the two solutions stay neutral.
by Caroline Cox 1H
Sun Feb 18, 2018 11:06 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Gold and Nitric Acid
Replies: 2
Views: 179

Re: Gold and Nitric Acid

Yes, the the formation of aqueous gold from solid gold is not a spontaneous reaction and therefore a positive delta G alone means the gold will not dissolve.
by Caroline Cox 1H
Sun Feb 04, 2018 8:14 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G°
Replies: 5
Views: 155

Re: Delta G°

When delta G is zero that means the system is at equilibrium.
by Caroline Cox 1H
Sun Feb 04, 2018 8:13 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: state functions
Replies: 3
Views: 99

Re: state functions

Yes, Professor Lavelle told us in class that Gibbs Free Energy is also a state function.
by Caroline Cox 1H
Sun Feb 04, 2018 8:10 pm
Forum: Van't Hoff Equation
Topic: Constants
Replies: 4
Views: 282

Constants

Can someone explain to me why we can assume that deltaH and deltaS are constant when using the Van't Hoff equation to calculate K at different temperatures?

Go to advanced search