Search found 50 matches

by 705302428
Thu Mar 12, 2020 10:52 am
Forum: First Order Reactions
Topic: Units for t
Replies: 13
Views: 127

Re: Units for t

I think it depends
by 705302428
Thu Mar 12, 2020 10:49 am
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 12
Views: 226

Re: Final

I think we submit it electronically maybe via scannable
by 705302428
Thu Mar 12, 2020 10:48 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Textbook question 6.65
Replies: 4
Views: 81

Re: Textbook question 6.65

I could be wrong but Kw=[H+][OH-] and when you have K=[H+]/[OH-] it could just be talking about a reaction where you're doing normal products over reactants and they aren't asking for Kw
by 705302428
Thu Mar 12, 2020 10:44 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: kinetics vs. thermodynamics
Replies: 7
Views: 74

Re: kinetics vs. thermodynamics

kinetics deals with reaction speed while thermodynamics deals with stability
by 705302428
Sat Mar 07, 2020 12:23 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: HW 6L.9
Replies: 4
Views: 51

Re: HW 6L.9

look at the reduction potentials and the one with the most positive reduction potential is the cathode and from there you can figure out which one is oxidized and reduced (AnOx, RedCat)
by 705302428
Sat Mar 07, 2020 12:19 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate-Limiting Step
Replies: 5
Views: 64

Re: Rate-Limiting Step

find the rate law you get from the experiment and then whichever step that has that same rate law is the slowest one.
by 705302428
Sat Mar 07, 2020 12:17 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Arrhenius Equation
Replies: 6
Views: 67

Re: Arrhenius Equation

you use it to find the equilibrium constant K. It defines the relationship between activation energy, the equilibrium constant, temperature, and A which is the frequency factor.
by 705302428
Sat Mar 07, 2020 12:13 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Rate of reaction
Replies: 3
Views: 55

Re: Rate of reaction

Normally the rate law deals with only reactants but if it includes product then it has a negative order if the product is in the denominator.
by 705302428
Sat Mar 07, 2020 12:11 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Potential
Replies: 3
Views: 83

Re: Potential

Max potential is standard E cell (the one with the degree symbol next to the E). Not sure about minimum potential
by 705302428
Wed Feb 26, 2020 12:38 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L.7
Replies: 3
Views: 48

Re: 6L.7

I think platinum would work as well, like we did in class.
by 705302428
Wed Feb 26, 2020 12:37 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L.5
Replies: 2
Views: 38

Re: 6L.5

Because you need the solid as a cathode/anode to transfer the electrons.
by 705302428
Wed Feb 26, 2020 12:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Monday 2/24 Lecture
Replies: 1
Views: 60

Re: Monday 2/24 Lecture

Here are the notes from Monday's lecture
by 705302428
Sat Feb 22, 2020 10:03 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Pt
Replies: 7
Views: 62

Re: Pt

Pt meant platinum and it was used as an inert conductor/electrode to transfer electrons. We include it in the cell diagram on the cathode side.
by 705302428
Sat Feb 22, 2020 10:00 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: more than 2 cells
Replies: 3
Views: 36

Re: more than 2 cells

It probably is but I don't think we will have to deal with anything like that.
by 705302428
Sat Feb 22, 2020 9:57 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: relevance of salt bridge
Replies: 9
Views: 56

Re: relevance of salt bridge

The salt bridge allows ion transfer and keeps the two solutions neutral.
by 705302428
Sat Feb 22, 2020 9:55 am
Forum: Van't Hoff Equation
Topic: Van't Hoff Equation
Replies: 3
Views: 62

Re: Van't Hoff Equation

It's derived from delta g because delta G equals delta H-T delta S as well as -RTlnK so you can set those two equations equal to each other and solve for lnK.
by 705302428
Sat Feb 22, 2020 9:49 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: measuring electron transfer
Replies: 2
Views: 15

Re: measuring electron transfer

Because we can't measure the electron transfer of one cell.
by 705302428
Fri Feb 14, 2020 9:06 pm
Forum: Ideal Gases
Topic: pv=nrt
Replies: 19
Views: 241

Re: pv=nrt

Yes
by 705302428
Fri Feb 14, 2020 9:05 pm
Forum: Ideal Gases
Topic: ideal gas
Replies: 5
Views: 118

Re: ideal gas

no intermolecular attractive forces.
by 705302428
Fri Feb 14, 2020 9:02 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Van't Hoff Equation
Replies: 3
Views: 44

Re: Van't Hoff Equation

I think you will be told whether or not change in S is constant.
by 705302428
Fri Feb 14, 2020 9:00 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 5G.17 HW
Replies: 2
Views: 48

Re: 5G.17 HW

The reaction is going in the reverse direction.
by 705302428
Fri Feb 07, 2020 8:15 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Equations
Replies: 3
Views: 34

Re: Equations

Look through the textbook, it specifies the conditions under which each equation is used.
by 705302428
Fri Feb 07, 2020 8:07 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: hw problem 4D 7 assuming T?
Replies: 3
Views: 34

Re: hw problem 4D 7 assuming T?

I think you can assume it's standard conditions (298K) unless otherwise specified.
by 705302428
Fri Feb 07, 2020 8:06 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: HW 4.19
Replies: 1
Views: 21

Re: HW 4.19

Section 4.C.3 from the textbook might be helpful to look at.
by 705302428
Fri Feb 07, 2020 8:00 pm
Forum: Calculating Work of Expansion
Topic: Equation for Work
Replies: 3
Views: 26

Re: Equation for Work

Yes I think so.
by 705302428
Fri Feb 07, 2020 7:59 pm
Forum: Calculating Work of Expansion
Topic: Units for Work
Replies: 5
Views: 36

Re: Units for Work

I think that would be given to us.
by 705302428
Fri Jan 31, 2020 5:18 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: KbNa
Replies: 4
Views: 309

Re: KbNa

Yes the Boltzmann constant is only used for gases.
by 705302428
Fri Jan 31, 2020 4:59 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Degeneracy
Replies: 9
Views: 111

Re: Degeneracy

We use the equation n^2. We use 2 because it's a two-state system and N represents the number of particles.
by 705302428
Fri Jan 31, 2020 4:54 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Volume and Pressure
Replies: 8
Views: 100

Re: Volume and Pressure

Volume and pressure are inversely related.
by 705302428
Fri Jan 31, 2020 4:49 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Work done by expansion
Replies: 8
Views: 61

Re: Work done by expansion

No we only know what to do when p is constant.
by 705302428
Fri Jan 24, 2020 7:14 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy and Pressure
Replies: 4
Views: 51

Re: Enthalpy and Pressure

Pressure and enthalpy are directly proportional so pressure needs to be constant in order to properly measure enthalpy.
by 705302428
Fri Jan 24, 2020 7:11 pm
Forum: Administrative Questions and Class Announcements
Topic: homework for week 4
Replies: 11
Views: 126

Re: homework for week 4

Any of the problems from the Thermodynamics section right after Acids and Bases.
by 705302428
Fri Jan 24, 2020 7:11 pm
Forum: Ideal Gases
Topic: Inert Gas
Replies: 12
Views: 149

Re: Inert Gas

inert gasses and noble gasses are the same.
by 705302428
Fri Jan 24, 2020 7:09 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: solvent
Replies: 10
Views: 56

Re: solvent

Only products and reactants with (aq) or (g) next to them will be included in the equilibrium constant expression. If it has (l), which solvents will, or (s), it is not included in the expression.
by 705302428
Fri Jan 24, 2020 7:06 pm
Forum: Phase Changes & Related Calculations
Topic: Heat vs. Enthalpy
Replies: 6
Views: 44

Re: Heat vs. Enthalpy

enthalpy is the study of heat released or absorbed in chemical reactions and physical changes. Heat is the energy transfer that results from a change in temperature between an object and its environment.
by 705302428
Fri Jan 17, 2020 6:42 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 5.33
Replies: 3
Views: 28

Re: 5.33

I believe Dr. Lavelle said that a catalyst only pertains to how quickly the reaction happens. It doesn't have anything to do with the actual components of the reaction.
by 705302428
Fri Jan 17, 2020 6:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5I.13 Equilibrium Composition
Replies: 2
Views: 49

Re: 5I.13 Equilibrium Composition

you might need to use the Kc value and not the K value if they're different.
by 705302428
Fri Jan 17, 2020 6:05 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Product Yield
Replies: 6
Views: 57

Re: Product Yield

By removing the product causing the reaction to instinctively produce more product.
by 705302428
Fri Jan 17, 2020 6:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE tables
Replies: 5
Views: 66

Re: ICE tables

We use ICE tables when the question is asking for the equilibrium concentrations of the reactants and products and it's not explicitly said that whatever numbers you are given are the equilibrium concentrations.
by 705302428
Fri Jan 17, 2020 6:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Table 5G.2 K vs Kc
Replies: 1
Views: 23

Re: Table 5G.2 K vs Kc

I think it's safe to just use Kc when in doubt.
by 705302428
Fri Jan 10, 2020 5:24 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: HW 5J.5
Replies: 8
Views: 57

Re: HW 5J.5

When dealing with equilibrium problems, you only need to take into account gases and aqueous solutions. In other words, ignore substances in solid and liquid form when writing your expression.
by 705302428
Fri Jan 10, 2020 5:21 pm
Forum: Ideal Gases
Topic: Ideal Gas Law
Replies: 6
Views: 49

Re: Ideal Gas Law

the ideal gas law helps us convert from partial pressure to concentration and vice versa.
by 705302428
Fri Jan 10, 2020 5:20 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: N2+3H2<->2NH3
Replies: 5
Views: 52

Re: N2+3H2<->2NH3

When the reaction goes left or right it simply means that a change on one side forces the reaction to make up for that change and shifts to the appropriate side.
by 705302428
Fri Jan 10, 2020 5:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Example 5I.4
Replies: 4
Views: 40

Re: Example 5I.4

Because we use partial pressure when dealing with gasses.
by 705302428
Fri Jan 10, 2020 5:13 pm
Forum: Ideal Gases
Topic: Chatelier’s Principle
Replies: 8
Views: 72

Re: Chatelier’s Principle

Le Chatelier's Principle: the idea that chemical reactions adjust so as to minimize the effect of any changes.

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