Search found 33 matches
- Fri Mar 15, 2019 9:46 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagrams (Using Platinum)
- Replies: 10
- Views: 1003
Re: Cell Diagrams (Using Platinum)
We decide to use platinum if there is not already a metal on one side of the diagram.
- Fri Mar 15, 2019 9:45 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: vertical line in cell diagram
- Replies: 4
- Views: 496
Re: vertical line in cell diagram
You only do it for solids, as solids cannot physically be mixed together.
- Fri Mar 15, 2019 9:43 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Reducing/Oxidizing Power
- Replies: 7
- Views: 2191
Re: Reducing/Oxidizing Power
The more positive a standard reduction potential, the better it is at being an oxidizing agent. The more negative a standard reduction potential, the better it is at being a reducing agent.
- Thu Mar 14, 2019 11:13 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: catalyst vs intermediate
- Replies: 9
- Views: 906
Re: catalyst vs intermediate
How can I tell the difference between a catalyst and an intermediate?
- Sat Mar 09, 2019 6:39 pm
- Forum: Zero Order Reactions
- Topic: Half Life and k
- Replies: 11
- Views: 1814
Re: Half Life and k
How exactly do we calculate half life?
- Sat Mar 09, 2019 6:38 pm
- Forum: Second Order Reactions
- Topic: Final
- Replies: 32
- Views: 2475
Re: Final
It will be cumulative my TA said, will have 8 questions, and will predominantly focus on thermo/test 2/kinetics.
- Sat Mar 09, 2019 6:36 pm
- Forum: Zero Order Reactions
- Topic: General “order” question
- Replies: 6
- Views: 923
Re: General “order” question
Another Quick Question: how do we determine the first order reaction/how is it correlated with y=mx+C
- Sat Mar 02, 2019 3:26 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst
- Replies: 4
- Views: 2497
Re: Nernst
What sort of energy/cell potential does Nernst equation tell us?
- Sat Mar 02, 2019 3:26 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagrams (Using Platinum)
- Replies: 10
- Views: 1003
Re: Cell Diagrams (Using Platinum)
We add in Pt on the ends of a cell diagram when there are no solid metals on either side of the cell diagrams.
- Sat Mar 02, 2019 3:24 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Cell Potential Spontaneity
- Replies: 7
- Views: 870
Re: Cell Potential Spontaneity
To understand this, use the equation Delta G= -n f e. So, when e is positive, the equation will still be negative. Thus, Delta G will be negative and spontaneous.
- Wed Feb 20, 2019 5:10 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Delta G a state function?
- Replies: 23
- Views: 2869
Re: Delta G a state function?
Delta G is a state function, as it is made up of other state functions since as enthalpy and entropy
- Wed Feb 20, 2019 5:08 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic Cells
- Replies: 7
- Views: 671
Re: Galvanic Cells
So just to clarify, does a galvanic cell involve the cathode and anode?
- Tue Feb 19, 2019 10:21 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs Free Energy Measurement
- Replies: 5
- Views: 663
Re: Gibbs Free Energy Measurement
To confirm, do we find the Delta H and Delta S by using standard reaction formula (Sum of Products) — (Sum of Reactants)?
- Tue Feb 19, 2019 10:17 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: gibbs free energy
- Replies: 10
- Views: 909
Re: gibbs free energy
Do spontaneous reactions have to occur quickly? Or do they just happen randomly?
- Tue Feb 19, 2019 10:10 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs Free Energy Measurement
- Replies: 5
- Views: 663
Re: Gibbs Free Energy Measurement
Delta G=Delta H— T * Delta S
- Thu Feb 14, 2019 9:26 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: 3/2R vs 5/2R
- Replies: 8
- Views: 2104
Re: 3/2R vs 5/2R
Is (3/2 R) the same as Cn when you are trying the change in entropy when there is a temperature difference?
- Thu Feb 14, 2019 9:25 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: gibbs free energy
- Replies: 10
- Views: 909
Re: gibbs free energy
How do you calculate Gibbs free energy?
- Thu Feb 14, 2019 9:25 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Isothermal and Free Expansion
- Replies: 2
- Views: 388
Re: Isothermal and Free Expansion
To find the change in work when there is an isothermal change, use -nRTV2/V1.
- Sat Feb 09, 2019 11:00 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Isolated System
- Replies: 5
- Views: 814
Re: Isolated System
In an isolated system, no energy or matter leave the system right? However in a closed system energy can leave the system?
- Sat Feb 09, 2019 10:59 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Midterm [ENDORSED]
- Replies: 49
- Views: 5012
Re: Midterm [ENDORSED]
Are the homework problems a good indicator of what the midterm will be like?
- Sat Feb 09, 2019 10:57 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K = 1
- Replies: 2
- Views: 353
Re: K = 1
When Q=K the reaction is at equilibrium, regardless of what those Q and K values are.
- Sun Feb 03, 2019 9:46 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpies and Lewis Structures
- Replies: 2
- Views: 323
Re: Bond Enthalpies and Lewis Structures
No I don't think so, it just helps you to see where lone pairs are going in a reaction
- Sun Feb 03, 2019 9:42 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Units
- Replies: 7
- Views: 665
Re: Units
Should work always be found in J or kJ? Or does it matter?
- Sun Feb 03, 2019 9:41 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: delta H vs q
- Replies: 9
- Views: 947
Re: delta H vs q
How exactly do you solve for delta H?
- Sun Jan 27, 2019 3:07 pm
- Forum: Phase Changes & Related Calculations
- Topic: State property
- Replies: 3
- Views: 375
Re: State property
For state properties, its value is not dependent on the path taken to obtain state (such as altitude, heat, enthalpy). For example, people can hike different paths and start and end at the same altitude. This shows that altitude is a state function because it only depends on the initial and final st...
- Sun Jan 27, 2019 2:57 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpies of Diatomic Molecules?
- Replies: 1
- Views: 123
Re: Bond Enthalpies of Diatomic Molecules?
I believe it is less accurate to use averages from different molecules, because you use the average of multiple different molecules. Whereas in bond enthalpies for diatomic molecules, they are each measured for those specific molecules (not an average).
- Sun Jan 27, 2019 2:53 pm
- Forum: Phase Changes & Related Calculations
- Topic: Phase changes
- Replies: 14
- Views: 1444
Re: Phase changes
If a reaction gives off heat, it has a negative delta h right? And this process is exothermic so it will release heat and then the surroundings will warm?
- Sun Jan 20, 2019 10:46 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Pressure Notation
- Replies: 5
- Views: 487
Re: Pressure Notation
When finding Kp, do you have to use a specific unit of pressure? Or can you use any?
- Sun Jan 20, 2019 10:44 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: The Conjugate Seesaw
- Replies: 13
- Views: 1007
Re: The Conjugate Seesaw
Does Kw=Ka*Kb and Kw=[H3O][OH]
- Sun Jan 20, 2019 10:43 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Week 1 Lecture 3
- Replies: 4
- Views: 317
Re: Week 1 Lecture 3
Correct, you can only calculate K when you have the molar equilibrium constants. If you just have the initial molarities, you can find Q.
- Sun Jan 20, 2019 10:41 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q VS. K
- Replies: 13
- Views: 1661
Q VS. K
Do you calculate Q the same way you calculate K? And then, you just compare Q to K to determine if more reactants are produced or not?
- Sun Jan 20, 2019 10:38 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Strong vs Weak Acids and Bases
- Replies: 2
- Views: 225
Re: Strong vs Weak Acids and Bases
A strong acid will completely deprotonate in water, whereas a strong base will completely protonate in water
- Sun Jan 20, 2019 10:26 pm
- Forum: Ideal Gases
- Topic: Calculating the Equilibrium Constant by Approximation
- Replies: 2
- Views: 318
Calculating the Equilibrium Constant by Approximation
When I'm finding the partial pressures of gases in an equilibrium mixture, how do I combine the partial pressures using ICE tables?