Search found 31 matches

by Jack Papciak 2F
Fri Mar 16, 2018 11:45 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: flipping half reactions
Replies: 2
Views: 100

flipping half reactions

How do we know which half reaction to flip?
by Jack Papciak 2F
Fri Mar 16, 2018 11:42 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cell diagram
Replies: 4
Views: 112

cell diagram

In a cell diagram, is the anode always on the left of the salt bridge and the cathode is always on the right side?
by Jack Papciak 2F
Fri Mar 16, 2018 11:39 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Calculating Q in cell diagram
Replies: 1
Views: 79

Calculating Q in cell diagram

In some problems, Q is calculated as products/reactants while in other problems, it is calculated as anode/cathode. As a general rule, how do you calculate Q? Is it based on the type of problem?
by Jack Papciak 2F
Tue Mar 13, 2018 9:42 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Adsorption
Replies: 4
Views: 149

Adsorption

Can somebody explain adsorption?
by Jack Papciak 2F
Tue Mar 13, 2018 9:37 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: UV catalyst
Replies: 3
Views: 116

UV catalyst

In class we did an example of catalysts where UV light helped convert oxygen to ozone. Is UV light the catalyst in this example or is it another chemical species?
by Jack Papciak 2F
Tue Mar 13, 2018 9:28 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Gas constants
Replies: 2
Views: 75

Re: Gas constants

Use the constant that make all the units that you don't want cancel.
by Jack Papciak 2F
Wed Mar 07, 2018 12:08 am
Forum: Second Order Reactions
Topic: 15.35a
Replies: 3
Views: 220

Re: 15.35a

The book rounded the k value to 0.024L/molxs so that's why it's a slightly different answer.
by Jack Papciak 2F
Wed Mar 07, 2018 12:05 am
Forum: General Rate Laws
Topic: Homework Problem 15.5
Replies: 1
Views: 42

Re: Homework Problem 15.5

You multiply by 3 because for every reaction, 3Oxygen is required so you have to multiply the overall rate .44 by the coefficient 3
by Jack Papciak 2F
Tue Mar 06, 2018 11:59 pm
Forum: First Order Reactions
Topic: 15.37(B) homework
Replies: 3
Views: 107

15.37(B) homework

I couldn't figure out this question so I checked the solutions manual and it says eventually you get ln10/2.8x10^-3. I don't understand where the ln10 is coming from. Any help would be appreciated
by Jack Papciak 2F
Tue Feb 27, 2018 8:53 pm
Forum: General Rate Laws
Topic: Negative 1/a
Replies: 8
Views: 240

Negative 1/a

Why is there a "-" in -1/a in the differential rate law?
by Jack Papciak 2F
Tue Feb 27, 2018 8:50 pm
Forum: First Order Reactions
Topic: Difference between 1st and 2nd order reactions
Replies: 3
Views: 3710

Difference between 1st and 2nd order reactions

What is the difference between 1st and 2nd order reactions besides the exponent?
by Jack Papciak 2F
Tue Feb 27, 2018 8:42 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Hw 15.1 [ENDORSED]
Replies: 7
Views: 211

Re: Hw 15.1 [ENDORSED]

Yes because for every 1 mol of N2 there's 3 moles of H2
by Jack Papciak 2F
Wed Feb 21, 2018 12:07 am
Forum: Balancing Redox Reactions
Topic: redox agent
Replies: 5
Views: 127

redox agent

What's the difference between something that is being oxidized and an oxidizing agent? How can you tell which is which?
by Jack Papciak 2F
Wed Feb 21, 2018 12:02 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: #14.23 finding n [ENDORSED]
Replies: 3
Views: 111

#14.23 finding n [ENDORSED]

When going through this problem, the solution manual says that n is 6 but I'm confused as to how we get that number. How do you find n for this question?
by Jack Papciak 2F
Tue Feb 20, 2018 11:58 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: platinum in cell diagram
Replies: 3
Views: 62

platinum in cell diagram

What's the purpose of using platinum in a cell diagram?
by Jack Papciak 2F
Tue Feb 13, 2018 8:58 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: DeltaG spontaneous
Replies: 1
Views: 61

DeltaG spontaneous

I know that a reaction with a negative deltaG is spontaneous, but what exactly does it mean to be spontaneous?
by Jack Papciak 2F
Tue Feb 13, 2018 8:47 pm
Forum: Calculating Work of Expansion
Topic: W=-P(deltaV) sign
Replies: 3
Views: 136

Re: W=-P(deltaT) sign

Sorry it should be a V not a T
by Jack Papciak 2F
Tue Feb 13, 2018 8:45 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: (DeltaU)=q+w Isothermal
Replies: 2
Views: 105

(DeltaU)=q+w Isothermal

I know that when there is no heat flow, DeltaU=w, but are there any other circumstances when an equation can be changed like that because it is isothermal or something that has a constant volume?
by Jack Papciak 2F
Tue Feb 13, 2018 8:37 pm
Forum: Calculating Work of Expansion
Topic: W=-P(deltaV) sign
Replies: 3
Views: 136

W=-P(deltaV) sign

Why is there a negative in front of V? I know it has something to do with work done on the system/surroundings but I am confused which sign goes with what.
by Jack Papciak 2F
Mon Feb 05, 2018 6:03 pm
Forum: Balancing Redox Reactions
Topic: Salt Bridges
Replies: 14
Views: 224

Re: Salt Bridges

A salt bridge allows for ion transfer between the two solutions, and this allows for the two solutions to stay neutral.
by Jack Papciak 2F
Mon Feb 05, 2018 5:57 pm
Forum: Balancing Redox Reactions
Topic: acronym for reduction
Replies: 5
Views: 176

acronym for reduction

I know that "LEO" is an acronym for oxidation reactions, but is there an acronym for reduction reactions?
by Jack Papciak 2F
Mon Feb 05, 2018 5:49 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Vibrationally Active
Replies: 1
Views: 142

Re: Vibrationally Active

The more it vibrates, the more chance of molecules hitting into eachother, and therefore the higher the entropy is.
by Jack Papciak 2F
Mon Jan 29, 2018 4:32 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: formula for standard entropy
Replies: 5
Views: 173

formula for standard entropy

Is the formula for the standard entropy the same as the formula for then standard enthalpy? They seem very similar but I just want to make sure
by Jack Papciak 2F
Mon Jan 29, 2018 4:28 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Entropy Change factors
Replies: 6
Views: 188

Re: Entropy Change factors

A more complex molecule would have a higher delta S because a more complex molecule has more possible vibrations and motions making the entropy greater.
by Jack Papciak 2F
Mon Jan 29, 2018 4:26 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: sign of entropy
Replies: 11
Views: 198

sign of entropy

How do I know whether the entropy has a "+" or a "-"?
by Jack Papciak 2F
Sun Jan 21, 2018 9:09 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: work definition
Replies: 5
Views: 164

work definition

What is a simple definition for work? I keep getting it confused with heat
by Jack Papciak 2F
Sun Jan 21, 2018 9:02 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 3 Test Topic is endorsed
Replies: 37
Views: 1646

Re: Week 3 Test Topic is endorsed

Are there any formulas that we need to memorize?
by Jack Papciak 2F
Sun Jan 21, 2018 8:57 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated vs Closed system
Replies: 3
Views: 138

Isolated vs Closed system

What is the difference between an isolated and a closed system?
by Jack Papciak 2F
Wed Jan 10, 2018 6:35 pm
Forum: Phase Changes & Related Calculations
Topic: Why can state properties be added?
Replies: 11
Views: 364

Why can state properties be added?

I understand the definition of state properties but I am a little confused as to why they can be added and subtracted. Any help would be greatly appreciated!
by Jack Papciak 2F
Wed Jan 10, 2018 6:01 pm
Forum: Phase Changes & Related Calculations
Topic: Endo and Exothermic Ways to Remember
Replies: 28
Views: 1748

Re: Endo and Exothermic Ways to Remember

A quick way I use is "into endo" and "exhale exo". Heat goes into the system during an endothermic reaction and heat is exhaled during a exothermic reaction.
by Jack Papciak 2F
Wed Jan 10, 2018 5:48 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Specific heat of water
Replies: 3
Views: 186

Specific heat of water

Why does the liquid form of water have a higher specific heat than the solid and gas versions?

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