## Search found 55 matches

Tue Mar 17, 2020 12:52 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Surface area and voltage
Replies: 1
Views: 67

### Surface area and voltage

How does surface area affect the voltage of a cell?
Tue Mar 17, 2020 12:51 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Doubling the amount of reducer/oxidizer
Replies: 2
Views: 96

### Doubling the amount of reducer/oxidizer

Does doubling the amount of reducer or oxidizer affect the voltage of a cell?
Tue Mar 17, 2020 12:51 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Water and voltage
Replies: 3
Views: 165

### Water and voltage

Does water affect the voltage of a cell?
Tue Mar 17, 2020 12:49 am
Forum: Phase Changes & Related Calculations
Topic: standard reaction enthalpy vs. standard enthalpy of formation
Replies: 7
Views: 214

### Re: standard reaction enthalpy vs. standard enthalpy of formation

When you say that standard reaction of formation is for an elements, does that encompass any state of matter?
Tue Mar 17, 2020 12:48 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ignoring solids & liquids for K
Replies: 7
Views: 137

### Re: ignoring solids & liquids for K

So an aqueous solution isn't considered a liquid?
Tue Mar 17, 2020 12:47 am
Forum: Balancing Redox Reactions
Topic: Reversing the anode
Replies: 10
Views: 140

### Re: Reversing the anode

If they are always given as recutions, How do you know which to flip to an oxidizer?
Tue Mar 17, 2020 12:45 am
Forum: Balancing Redox Reactions
Topic: Balancing redox with h2o
Replies: 9
Views: 124

### Re: Balancing redox with h2o

So adding h2o, h3o+, and oh- balances the charge and elements or do you then have to add certain elements? Are you limited to just those 3?
Tue Mar 17, 2020 12:43 am
Forum: General Rate Laws
Topic: Knowing the rate of absorption
Replies: 3
Views: 123

### Knowing the rate of absorption

How can you figure out the rate of formation of one element if you know the rate of absorption of another element?
Tue Mar 17, 2020 12:38 am
Forum: Balancing Redox Reactions
Topic: Switching the anode reaction
Replies: 1
Views: 71

### Switching the anode reaction

Why is is that in the hw problems, the anode reaction is always flipped?
Tue Mar 17, 2020 12:35 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Increasing voltage of a cell
Replies: 3
Views: 103

### Increasing voltage of a cell

What factors affect the voltahe of a cell?
Tue Mar 17, 2020 12:33 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: What to do if R>P for two equations
Replies: 4
Views: 117

### What to do if R>P for two equations

If 2 equations have R>P, how can tou tell which one is mote favorable to the right?
Tue Mar 17, 2020 12:31 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G of ionization
Replies: 3
Views: 310

### Delta G of ionization

Is deltaG of ionization the same as regular deltaG?
Tue Mar 17, 2020 12:30 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 2 deltaG equations
Replies: 1
Views: 79

### 2 deltaG equations

What is the relationship between the equations deltaG=-RTlnK and deltaG= deltaH-TdeltaS?
Tue Mar 17, 2020 12:26 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Ecell vs Eocell
Replies: 2
Views: 89

### Ecell vs Eocell

What is the difference between Welland Eocell?
Tue Mar 17, 2020 12:25 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Oxidizer vs reducer
Replies: 3
Views: 93

### Oxidizer vs reducer

How do you differentiate between which equation is the oxidizer and which is the reducer when you are given 2 equations?
Sun Mar 08, 2020 11:46 pm
Forum: Balancing Redox Reactions
Topic: Reversing the anode
Replies: 10
Views: 140

### Reversing the anode

Why is it that the anode reaction is always reversed when determining the cell potential?
Sun Mar 08, 2020 11:45 pm
Forum: Balancing Redox Reactions
Topic: Determining the oxidizer and reducer
Replies: 10
Views: 95

### Determining the oxidizer and reducer

Given 2 reactions, how do you distinguish which is the oxidizer and which is the reducer?
Sun Mar 08, 2020 11:43 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Concentration
Replies: 9
Views: 72

### Concentration

How can you find the concentration of the anode or cathode given the concentration of the other? There was a question on the quiz which I did not understand how to solve that had this set up.
Sun Mar 08, 2020 11:42 pm
Forum: Balancing Redox Reactions
Topic: Balancing redox with h2o
Replies: 9
Views: 124

### Balancing redox with h2o

How do you balance a redox equation using h2o, h+, and oh-?
Sun Mar 08, 2020 11:40 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Ecell
Replies: 5
Views: 51

### Ecell

What is the difference between Ecell and Ecello?
Sun Mar 01, 2020 11:48 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: different coefficients (3/2,5/2...)
Replies: 3
Views: 120

### Re: different coefficients (3/2,5/2...)

Do we have to memorize certain coefficients for important instances?
Sun Mar 01, 2020 11:47 pm
Forum: Balancing Redox Reactions
Topic: Determining direction of flow
Replies: 15
Views: 178

### Re: Determining direction of flow

Why does the reaction always go from the anode to the cathode?
Sun Mar 01, 2020 11:44 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gp=Gr
Replies: 3
Views: 71

### Re: Gp=Gr

What does it mean for them to be at their lowest energy states?
Sun Mar 01, 2020 11:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Going from pKa to pH
Replies: 10
Views: 167

### Re: Going from pKa to pH

I was confused because in my notes u had pka=10^7 and pH=7 so I don't know if I miswrote it.
Sun Mar 01, 2020 11:34 pm
Forum: Ideal Gases
Topic: Conjugate acid and bases
Replies: 7
Views: 170

### Re: Conjugate acid and bases

Is a base a proton acceptor or donor?
Sun Feb 23, 2020 8:38 pm
Forum: Ideal Gases
Topic: Conjugate acid and bases
Replies: 7
Views: 170

### Conjugate acid and bases

How do you determine the conjugate acid/base given one of them?
Sun Feb 23, 2020 8:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Going from pKa to pH
Replies: 10
Views: 167

### Going from pKa to pH

I'm still quite confused on how to go from pKa to pH like it was asked on one of the midterm questions. Could someone break it down?
Sun Feb 23, 2020 8:34 pm
Forum: Balancing Redox Reactions
Topic: Half reactions
Replies: 17
Views: 200

### Half reactions

What does it mean when half of the reaction is balanced?
Sun Feb 23, 2020 8:30 pm
Forum: Balancing Redox Reactions
Topic: Determining direction of flow
Replies: 15
Views: 178

### Determining direction of flow

What does it mean when the direction of flow goes from left to right?
Sun Feb 23, 2020 8:26 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gp=Gr
Replies: 3
Views: 71

### Gp=Gr

Why does Gp have to equal Gr in order for the system to be in equilibrium?
Sun Feb 23, 2020 8:25 pm
Forum: Van't Hoff Equation
Topic: deltaS/R
Replies: 7
Views: 97

### deltaS/R

Why do we ignore the deltaS/R when we are comparing T1 and T2?
Sun Feb 09, 2020 10:11 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: qp=deltaH
Replies: 6
Views: 66

### qp=deltaH

What does it mean for qp=deltaH?
Sun Feb 09, 2020 9:46 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: different coefficients (3/2,5/2...)
Replies: 3
Views: 120

### different coefficients (3/2,5/2...)

How are these coefficients calculated for the equation of Utot=(3/2)nRT?
Sun Feb 09, 2020 9:37 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: deltaU=deltaH= negative
Replies: 2
Views: 28

### deltaU=deltaH= negative

Why is it that when deltaU=deltaH= negative, the reaction is favorable?
Sun Feb 09, 2020 9:13 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: constant p
Replies: 4
Views: 43

### constant p

What does it mean if qp= deltaH?
Sun Feb 09, 2020 9:00 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Reversible expansion
Replies: 3
Views: 35

### Reversible expansion

What does it mean for a something to be an isothermal reversible expansion or irreversible free expansion?
Thu Jan 30, 2020 10:14 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: qp=deltaH
Replies: 2
Views: 43

### qp=deltaH

Why is it that in the example from monday 1/27 lecture, qp=deltaH?
Thu Jan 30, 2020 10:00 pm
Forum: Phase Changes & Related Calculations
Topic: standard reaction enthalpy vs. standard enthalpy of formation
Replies: 7
Views: 214

### standard reaction enthalpy vs. standard enthalpy of formation

What is the difference between values of standard reaction enthalpy and standard enthalpy of formation?
Thu Jan 30, 2020 9:43 pm
Forum: Phase Changes & Related Calculations
Topic: phase change heat supplied
Replies: 3
Views: 59

### phase change heat supplied

Why does the heat supplied for phase changes between each state vary so much? Why does it take more heat to change from liquid to gas than any other phase change?
Thu Jan 30, 2020 9:41 pm
Forum: Phase Changes & Related Calculations
Topic: phase change from liquid to vapor
Replies: 8
Views: 102

### phase change from liquid to vapor

I still don't understand why steam burns are so strong. Why does it matter that it takes more kJ/mol to change the phase from liquid to gas?
Fri Jan 24, 2020 1:12 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: HNO2(aq) + H2O(l) -> H3O+(aq) + NO2-(aq)
Replies: 2
Views: 29

### HNO2(aq) + H2O(l) -> H3O+(aq) + NO2-(aq)

In the example from Fri 1/17's lecture, the questions stated that the solution had KNO2(aq) but it is not directly used. Instead, the 0.150M of KNO2 were assigned to NO2-. Why is that? What is their relationship?
Fri Jan 24, 2020 12:52 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: k<10^-3
Replies: 9
Views: 106

### k<10^-3

Why is it that a value of k<10^-3 means it is a weak acid?
Thu Jan 23, 2020 11:12 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ignoring solids & liquids for K
Replies: 7
Views: 137

### ignoring solids & liquids for K

If we are supposed to ignore solids and liquids when calculating K, why is it that in the example CaOH2(s) -> Ca2+(aq) + 2OH-(aq), we used the Ca2+ and OH-?
Thu Jan 23, 2020 8:48 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: removing H2 from N2 + 3H2 -> 2NH3
Replies: 7
Views: 133

### removing H2 from N2 + 3H2 -> 2NH3

Why does decreasing H2 from the reaction cause NH3 to produce more H2? Wouldn't that just cause there to be a constant amount of H2?
Thu Jan 23, 2020 8:12 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q<K
Replies: 11
Views: 90

### Q<K

Why is it that if Q<K, the forward reaction is favored if [R]>[P]?
Sun Jan 19, 2020 11:23 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Approximations
Replies: 3
Views: 36

### Approximations

What does it mean when it is stated at the end of a problem that the initial approximation is valid?
Sun Jan 19, 2020 11:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5I. 33
Replies: 1
Views: 27

### 5I. 33

Do you have to use an ICE table to solve this? How would you calculate the initial M(molarity) of NH3?
Sun Jan 19, 2020 11:19 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Pressure
Replies: 1
Views: 27

### Pressure

Why does pressure affect concentration in that is causes the equilibrium to shift to the side which has the least moles?
Thu Jan 16, 2020 8:23 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6C.3 Ka and pKa
Replies: 1
Views: 20

### 6C.3 Ka and pKa

To convert between Ka and pKa is it as simple as going from pKa=2.12 and Ka= 10^-2.12 since pKa=-log(Ka)?
Thu Jan 16, 2020 8:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: strong/weak acids and bases
Replies: 2
Views: 24

### strong/weak acids and bases

How can you tell by looking at a chemical formula what is a strong/weak acid or base?
Sun Jan 12, 2020 6:58 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: volume change with inert gas
Replies: 9
Views: 96

### volume change with inert gas

Why doesn't the reaction shift when the pressure is changed by an inert gas?
Sun Jan 12, 2020 6:55 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: increasing N2
Replies: 5
Views: 82

### increasing N2

Why is it that if you increase N2 in the ammonia reaction, H2 will decrease?
Sun Jan 12, 2020 6:51 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: increasing yield of NH3
Replies: 3
Views: 51

### increasing yield of NH3

Why is it that in order to increase the yield of NH3, you could remove NH3? Wouldn't that just decrease the amount of NH3?
Thu Jan 09, 2020 9:29 pm
Forum: Ideal Gases
Topic: Difference between K and Q
Replies: 9
Views: 76

### Difference between K and Q

What is the difference between the significance of K and Q if it is the same formula to find each value?
Thu Jan 09, 2020 9:27 pm
Forum: Ideal Gases
Topic: eq constant
Replies: 4
Views: 40

### eq constant

Why do we ignore the terms that are solids when calculating the eq. constat? Why does it not have an effect on the concentration?