Search found 29 matches
- Sun Mar 17, 2019 9:53 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Effect of increased concentration on equilibrium
- Replies: 9
- Views: 1488
Re: Effect of increased concentration on equilibrium
The same would also go if you increased the concentration of products, the system will favor the opposite direction, the backwards reaction.
- Sun Mar 17, 2019 9:48 am
- Forum: Calculating Work of Expansion
- Topic: Use of the two equations
- Replies: 1
- Views: 381
Use of the two equations
How would you know which equation to use, since both express a change in volume?
- Sun Mar 17, 2019 9:32 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: E cell
- Replies: 3
- Views: 636
E cell
I know for galvanic cells, the E cell can't be negative, but can it be negative for voltaic cells?
- Sun Mar 17, 2019 9:26 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: bomb calorimeter
- Replies: 8
- Views: 1220
Re: bomb calorimeter
What is constant in this situation?
- Sun Mar 17, 2019 9:14 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: What is pKa and Ka exactly?
- Replies: 16
- Views: 25077
Re: What is pKa and Ka exactly?
Would the inverse relationship apply to Kb and pKb as well?
- Sun Mar 17, 2019 9:12 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Cv or Cp
- Replies: 5
- Views: 692
Re: Cv or Cp
Also, whenever you see that volume isn't constant, but you account for it in another "delta S =" equation, you can still us Cv.
- Sun Mar 17, 2019 9:10 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Useful Summary of Thermodynamic Definitions
- Replies: 55
- Views: 18556
Re: Useful Summary of Thermodynamic Definitions
I don't believe so, I think they tell us in the question so we use specific equations.Abby-Hile-1F wrote:will we need to identify processes as isobaric, isochoric, or isothermal?
- Sun Mar 17, 2019 9:08 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: pseudo rate law
- Replies: 7
- Views: 1111
Re: pseudo rate law
How would we know if the reactant is in excess? Would that be told to us or would we just have to ballpark it based on looking at the concentration?
- Sun Mar 17, 2019 9:05 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: k(1)/k(-1)
- Replies: 4
- Views: 613
Re: k(1)/k(-1)
If we want to express both can we use Kc? For example, can we use Kc when doing pre-equilibrium calculations?
- Sun Mar 17, 2019 9:04 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Arrhenius Equation
- Replies: 3
- Views: 566
Re: Arrhenius Equation
Can we assume A will be 1 unless the question specifies that we have to solve for it?
- Sun Mar 10, 2019 9:45 pm
- Forum: First Order Reactions
- Topic: Rate dependency
- Replies: 5
- Views: 561
Rate dependency
Is the rate really only dependent on the reactants? Is that the scope of this class?
- Sun Mar 10, 2019 9:10 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Approximation
- Replies: 7
- Views: 1282
Re: Approximation
Are we allowed to approximate below 10^-4 or 10^-3?
- Sun Mar 10, 2019 8:48 pm
- Forum: First Order Reactions
- Topic: Molar coefficients
- Replies: 4
- Views: 490
Molar coefficients
When calculating the order of each molecule, do the molar coefficients matter?
- Sun Mar 03, 2019 11:11 pm
- Forum: General Rate Laws
- Topic: The value of K
- Replies: 5
- Views: 463
The value of K
Will "K", the rate constant, be unique for each reaction or is it a set number?
- Sun Mar 03, 2019 11:08 pm
- Forum: General Rate Laws
- Topic: m and n
- Replies: 2
- Views: 304
m and n
In lecture what does the power to "m" and "n" represent? I'm a little confused about what overall reaction order is.
- Sun Mar 03, 2019 11:06 pm
- Forum: General Rate Laws
- Topic: Average rate of products and reactants
- Replies: 1
- Views: 204
Average rate of products and reactants
Is it always true that the average rate of products and the average rate of reactants are inversely related?
- Sun Feb 24, 2019 10:41 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell diagram
- Replies: 4
- Views: 398
Cell diagram
In the cell diagram with no double lines to indicate a salt bridge, how would you distinguish between the anode and the cathode? Or is it still generally accepted that the left side is the anode and the right side is the cathode?
- Sun Feb 24, 2019 10:33 pm
- Forum: Balancing Redox Reactions
- Topic: Problem 14.1, 6th ed.
- Replies: 3
- Views: 391
Re: Problem 14.1, 6th ed.
Wouldn't you be balancing oxygen and hydrogen to figure out the overall charge and then balance the charges by adding electrons?
- Sun Feb 24, 2019 10:31 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: n in -nFE
- Replies: 14
- Views: 887
n in -nFE
is n equal to the number of moles or the number of electrons transferred in the process?
- Sun Feb 10, 2019 9:52 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Specific heat
- Replies: 3
- Views: 389
Specific heat
Will we always be given the specific heat (C) of a molecule on the midterm/final, or are there some situations where we need to calculate it through other means?
- Sun Feb 10, 2019 9:50 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: q and delta H
- Replies: 3
- Views: 437
Re: q and delta H
Does this mean that delta H is equal to n*C*m*change in T?
- Sun Feb 10, 2019 9:46 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Molar Heat Capacity
- Replies: 1
- Views: 915
Molar Heat Capacity
Why is the molar heat capacity, with constant pressure, equal to the molar heat capacity with constant volume (Cv,m) plus the gas constant (R)?
- Sun Feb 03, 2019 11:03 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Entropy
- Replies: 3
- Views: 367
Entropy
How is a change in internal energy equal to a change in entropy?
- Sun Feb 03, 2019 10:59 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Constant P
- Replies: 4
- Views: 450
Constant P
If we are to assume there is constant pressure, do we assume that P is equal to 1atm?
- Sun Feb 03, 2019 10:35 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Open vs Closed System
- Replies: 13
- Views: 4581
Open vs Closed System
How can matter and energy be exchanged with its surroundings in certain solutions, such as in open systems, but only energy can be exchanged in other ones, closed systems?
- Sun Jan 27, 2019 9:52 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard reaction enthalpy
- Replies: 2
- Views: 258
Re: Standard reaction enthalpy
You can calculate the standard reaction enthalpy by using the standard enthalpy of formation of all products and subtract the standard enthalpy of formation of all reactants.
- Sun Jan 13, 2019 11:55 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: K and Q [ENDORSED]
- Replies: 7
- Views: 697
K and Q [ENDORSED]
What is the difference between K and Q? Why do we need to know the difference?
- Sun Jan 13, 2019 8:29 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K value
- Replies: 2
- Views: 84
Re: K value
The K value determines whether the reaction favors either the reactants or the products. Thermodynamics determines if a reaction is spontaneous or not.
- Sun Jan 13, 2019 8:26 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Catalyst
- Replies: 4
- Views: 222
Catalyst
Why don't catalysts affect the equilibrium constant?