Search found 29 matches

by Matthew Casillas 1C
Sun Mar 17, 2019 9:53 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Effect of increased concentration on equilibrium
Replies: 9
Views: 338

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.
by Matthew Casillas 1C
Sun Mar 17, 2019 9:48 am
Forum: Calculating Work of Expansion
Topic: Use of the two equations
Replies: 1
Views: 117

Use of the two equations

How would you know which equation to use, since both express a change in volume?
by Matthew Casillas 1C
Sun Mar 17, 2019 9:32 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: E cell
Replies: 3
Views: 124

E cell

I know for galvanic cells, the E cell can't be negative, but can it be negative for voltaic cells?
by Matthew Casillas 1C
Sun Mar 17, 2019 9:26 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: bomb calorimeter
Replies: 6
Views: 293

Re: bomb calorimeter

What is constant in this situation?
by Matthew Casillas 1C
Sun Mar 17, 2019 9:14 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: What is pKa and Ka exactly?
Replies: 11
Views: 564

Re: What is pKa and Ka exactly?

Would the inverse relationship apply to Kb and pKb as well?
by Matthew Casillas 1C
Sun Mar 17, 2019 9:12 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Cv or Cp
Replies: 3
Views: 116

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.
by Matthew Casillas 1C
Sun Mar 17, 2019 9:10 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Useful Summary of Thermodynamic Definitions
Replies: 23
Views: 13484

Re: Useful Summary of Thermodynamic Definitions

Abby-Hile-1F wrote:will we need to identify processes as isobaric, isochoric, or isothermal?
I don't believe so, I think they tell us in the question so we use specific equations.
by Matthew Casillas 1C
Sun Mar 17, 2019 9:08 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: pseudo rate law
Replies: 7
Views: 157

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?
by Matthew Casillas 1C
Sun Mar 17, 2019 9:05 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: k(1)/k(-1)
Replies: 4
Views: 149

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?
by Matthew Casillas 1C
Sun Mar 17, 2019 9:04 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation
Replies: 3
Views: 147

Re: Arrhenius Equation

Can we assume A will be 1 unless the question specifies that we have to solve for it?
by Matthew Casillas 1C
Sun Mar 10, 2019 9:45 pm
Forum: First Order Reactions
Topic: Rate dependency
Replies: 5
Views: 78

Rate dependency

Is the rate really only dependent on the reactants? Is that the scope of this class?
by Matthew Casillas 1C
Sun Mar 10, 2019 9:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Approximation
Replies: 7
Views: 105

Re: Approximation

Are we allowed to approximate below 10^-4 or 10^-3?
by Matthew Casillas 1C
Sun Mar 10, 2019 8:48 pm
Forum: First Order Reactions
Topic: Molar coefficients
Replies: 4
Views: 68

Molar coefficients

When calculating the order of each molecule, do the molar coefficients matter?
by Matthew Casillas 1C
Sun Mar 03, 2019 11:11 pm
Forum: General Rate Laws
Topic: The value of K
Replies: 5
Views: 77

The value of K

Will "K", the rate constant, be unique for each reaction or is it a set number?
by Matthew Casillas 1C
Sun Mar 03, 2019 11:08 pm
Forum: General Rate Laws
Topic: m and n
Replies: 2
Views: 41

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.
by Matthew Casillas 1C
Sun Mar 03, 2019 11:06 pm
Forum: General Rate Laws
Topic: Average rate of products and reactants
Replies: 1
Views: 29

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?
by Matthew Casillas 1C
Sun Feb 24, 2019 10:41 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell diagram
Replies: 4
Views: 52

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?
by Matthew Casillas 1C
Sun Feb 24, 2019 10:33 pm
Forum: Balancing Redox Reactions
Topic: Problem 14.1, 6th ed.
Replies: 3
Views: 41

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?
by Matthew Casillas 1C
Sun Feb 24, 2019 10:31 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: n in -nFE
Replies: 6
Views: 84

n in -nFE

is n equal to the number of moles or the number of electrons transferred in the process?
by Matthew Casillas 1C
Sun Feb 10, 2019 9:52 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Specific heat
Replies: 3
Views: 73

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?
by Matthew Casillas 1C
Sun Feb 10, 2019 9:50 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: q and delta H
Replies: 3
Views: 47

Re: q and delta H

Does this mean that delta H is equal to n*C*m*change in T?
by Matthew Casillas 1C
Sun Feb 10, 2019 9:46 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Molar Heat Capacity
Replies: 1
Views: 52

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)?
by Matthew Casillas 1C
Sun Feb 03, 2019 11:03 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Entropy
Replies: 3
Views: 67

Entropy

How is a change in internal energy equal to a change in entropy?
by Matthew Casillas 1C
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: 61

Constant P

If we are to assume there is constant pressure, do we assume that P is equal to 1atm?
by Matthew Casillas 1C
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: 176

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?
by Matthew Casillas 1C
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: 48

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.
by Matthew Casillas 1C
Sun Jan 13, 2019 11:55 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: K and Q [ENDORSED]
Replies: 7
Views: 106

K and Q [ENDORSED]

What is the difference between K and Q? Why do we need to know the difference?
by Matthew Casillas 1C
Sun Jan 13, 2019 8:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K value
Replies: 2
Views: 25

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.
by Matthew Casillas 1C
Sun Jan 13, 2019 8:26 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Catalyst
Replies: 4
Views: 43

Catalyst

Why don't catalysts affect the equilibrium constant?

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