Search found 32 matches
- Thu Mar 15, 2018 9:38 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: 15.101b
- Replies: 3
- Views: 446
Re: 15.101b
@ Kayla, i think it is because it is implied that H2O is a liquid and liquids and solids are not included in the equilibrium constant?? thats the only reasoning i can think of
- Tue Mar 13, 2018 4:56 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Frequency Factor
- Replies: 1
- Views: 331
Frequency Factor
What is frequency factor?
- Tue Mar 13, 2018 4:49 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Collision Theory
- Replies: 1
- Views: 265
Collision Theory
In the book, it covers collision theory as well as mean relative speed. Are we going to be asked about that? I don't specifically remember covering these in class
- Tue Mar 13, 2018 4:34 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalyst
- Replies: 3
- Views: 455
Re: Catalyst
Also, does the fact that a catalyst can be homogeneous or heterogeneous have an affect on delta G and/or activation energy?
- Tue Mar 13, 2018 4:31 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: steady-state
- Replies: 1
- Views: 279
steady-state
Can someone give me an example of a reactant in a steady-state? How do we determine if something is at a steady state?
- Tue Mar 13, 2018 4:25 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalyst
- Replies: 3
- Views: 455
Catalyst
Does a reaction with catalyst always have the same delta G as a reaction with out a catalyst? What about activation energy?
- Sun Mar 04, 2018 3:45 pm
- Forum: General Rate Laws
- Topic: Independent of the rate
- Replies: 2
- Views: 372
Independent of the rate
What determines an element of being independent of the rate?
- Sun Mar 04, 2018 2:59 pm
- Forum: First Order Reactions
- Topic: orders of a reaction
- Replies: 3
- Views: 463
orders of a reaction
By looking at a reaction, what are some tips on determining the order of a reaction?
- Sun Mar 04, 2018 2:00 pm
- Forum: First Order Reactions
- Topic: Integrated rate law for first order reaction
- Replies: 3
- Views: 484
Integrated rate law for first order reaction
We were given two different equations for the integrated rate law for first order reaction. In which circumstances do we use each of them?
- Sun Feb 25, 2018 5:11 pm
- Forum: *Free Energy of Activation vs Activation Energy
- Topic: What is Free Energy of Activation
- Replies: 11
- Views: 3612
What is Free Energy of Activation
What is free energy of activation?
- Tue Feb 20, 2018 12:55 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic cells
- Replies: 2
- Views: 300
Galvanic cells
When solving for Ecell, if you reversed the anode reaction, does the sign of E(anode) also get reversed?
- Mon Feb 19, 2018 3:55 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: 14.21
- Replies: 1
- Views: 364
14.21
for part d, how do you determine which is equation is being reduced or oxidized, since they are both receiving electrons and their charges are being reduced?
- Mon Feb 19, 2018 3:00 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: 14.9
- Replies: 1
- Views: 336
14.9
Can someone show how for problem b, n=6??
- Sun Feb 18, 2018 5:18 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: electrolytic cells
- Replies: 3
- Views: 679
electrolytic cells
what is the point of electrolytic cells? What are they used for?
- Sun Feb 18, 2018 4:12 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: galvanic cells and voltaic cells
- Replies: 2
- Views: 314
galvanic cells and voltaic cells
Are galvanic cells the same thing as voltaic cells?
- Sun Feb 18, 2018 2:55 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing Redox reactions
- Replies: 3
- Views: 533
Balancing Redox reactions
when balancing half reactions, should we always balance the oxygen first before hydrogen or can it be the other way around?
- Sun Feb 11, 2018 1:42 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: 9.13
- Replies: 3
- Views: 436
9.13
the question states that "during the test of an internal combustion engine, 3.00 L of nitrogen gas at 18.5 degrees C was compressed suddenly (and irreversibly) to .500 L by driving in a piston. In the process, the temp of the gas increased to 28.1 degrees C. Assume ideal behavior and 1 mole of ...
- Sat Feb 10, 2018 5:29 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation vs. reduction
- Replies: 8
- Views: 881
Oxidation vs. reduction
How do you tell which equation is the being oxidized or reduced?
- Sat Feb 10, 2018 5:25 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Delta G
- Replies: 4
- Views: 541
Delta G
why is delta G =0 at equilibrium?
- Sat Feb 10, 2018 5:20 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Derivations of Equations
- Replies: 5
- Views: 660
Derivations of Equations
For the midterm, are we going to need to know how to derive the Gibb's free energy formula?
- Sat Feb 03, 2018 7:35 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Delta G [ENDORSED]
- Replies: 4
- Views: 504
Delta G [ENDORSED]
why is delta G always negative?
- Sat Feb 03, 2018 7:34 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Degeneracy vs Disorder
- Replies: 4
- Views: 576
Degeneracy vs Disorder
is degeneracy the same thing as disorder?
- Sat Feb 03, 2018 7:26 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Which value of R to use?
- Replies: 3
- Views: 395
Re: Which value of R to use?
The values of R are based of the units. It helps to write out all of the units while working on a problem so you keep track of everything.
- Sat Jan 27, 2018 1:49 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: constant pressure
- Replies: 5
- Views: 502
Re: constant pressure
as previously mentioned, it is important to note that the units for delta H are kj/mole. Therefore, when determining the enthalpy for a specific molecule or compound in a reaction, you need to take into account the stoichiometric coefficient to determine the enthalpy for that specific molecule or co...
- Sat Jan 27, 2018 1:44 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Reversible isothermal expansion
- Replies: 4
- Views: 467
Reversible isothermal expansion
Will we need to know how to derive the formula for reversible isothermal expansion for future tests?
- Sat Jan 27, 2018 1:36 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Spontaneous Reactions [ENDORSED]
- Replies: 2
- Views: 188
Spontaneous Reactions [ENDORSED]
Can someone explain to me how to determine if a reaction is spontaneous or not? Super confused
- Sat Jan 20, 2018 3:58 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Enthalpy
- Replies: 3
- Views: 336
Re: Enthalpy
Heat is the energy transferred from a system to its surroundings and enthalpy is the measurement of the amount of heat that was exchanged.
- Sat Jan 20, 2018 3:54 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Most Accurate Method [ENDORSED]
- Replies: 3
- Views: 384
Re: Most Accurate Method [ENDORSED]
They are all relatively accurate but the most accurate is the enthalpy of formation. With the bond enthalpies, the numbers are rounded but with enthalpy of formation, the numbers are based of the states of the molecules and are specific to the states.
- Sat Jan 20, 2018 3:51 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Finding change in enthalpy when given bond enthalpies
- Replies: 3
- Views: 266
Re: Finding change in enthalpy when given bond enthalpies
When given bond enthalpies, it helps to draw the lewis structures and to analyze the change in the structures. When given bond enthalpies, you take the sum of the bonds broken minus the sum of the bonds formed! Hope this helps!
- Fri Jan 12, 2018 3:48 pm
- Forum: Phase Changes & Related Calculations
- Topic: Boiling water vs. steam
- Replies: 6
- Views: 1096
Re: Boiling water vs. steam
if you look at the heating curve of water, going from solid to liquid to vapor, you will see the increase in temperature along with the increase of heat being applied to the water. As the water goes from solid to liquid, the enthalpy does not change by a significant amount. As water completes a phas...
- Fri Jan 12, 2018 3:41 pm
- Forum: Phase Changes & Related Calculations
- Topic: Irreversible process vs reversible process
- Replies: 4
- Views: 317
Irreversible process vs reversible process
Can someone explain to me the difference between irreversible and reversible processes?? Really confused
- Fri Jan 12, 2018 3:35 pm
- Forum: Phase Changes & Related Calculations
- Topic: Standard Reaction Enthalpy
- Replies: 8
- Views: 829
Re: Standard Reaction Enthalpy
standard reaction enthalpy occurs within a reaction when the reactants that are in their standards states turn into products in their standard states. the standard enthalpy of formation is the standard reaction enthalpy PER MOLE of formula units for the formation of a substance from elements in thei...