## Search found 50 matches

Mon Mar 16, 2020 8:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ATP QUESTION ON FINAL
Replies: 9
Views: 211

### Re: ATP QUESTION ON FINAL

Mon Mar 16, 2020 8:27 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Graphs
Replies: 3
Views: 83

### Re: Graphs

the graphs are specific to a specific reactant/molecule
Mon Mar 16, 2020 8:25 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Slowest step
Replies: 9
Views: 127

### Re: Slowest step

the overall reaction can't come to completion until the slowest step comes to completion, so this rate determines the overall rate
Mon Mar 16, 2020 8:24 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Doing work vs work done
Replies: 8
Views: 143

### Re: Doing work vs work done

work is positive when it is done on the system and negative when it is done by the system
Mon Mar 16, 2020 8:23 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Gibbs free energy
Replies: 8
Views: 144

### Re: Gibbs free energy

standard Gibbs energy is under standard state conditions
Mon Mar 16, 2020 8:22 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Redox from cell diagram
Replies: 6
Views: 93

### Re: Redox from cell diagram

the species on the left is oxidized and on the right is reduced
Mon Mar 16, 2020 8:21 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: k
Replies: 7
Views: 134

### Re: k

large k indicates a fast rate and a small k indications a slow rate
Mon Mar 16, 2020 8:20 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Concentration Cells
Replies: 8
Views: 148

### Re: Concentration Cells

because the cell potentials of the cathode and anode are equal
Mon Mar 16, 2020 8:18 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: calculating standard cell potential
Replies: 6
Views: 92

### Re: calculating standard cell potential

subtract the standard potential of the anode (left) from the standard potential of the cathode (right)
Mon Mar 16, 2020 8:17 pm
Forum: Zero Order Reactions
Topic: 0 order
Replies: 7
Views: 120

### Re: 0 order

a reaction is zero order if it is independent of the concentration of reactants
Mon Mar 16, 2020 8:16 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta U
Replies: 4
Views: 108

### Re: Delta U

you examine if work is done on or by the system
Mon Mar 16, 2020 8:14 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetic control
Replies: 3
Views: 70

### Re: Kinetic control

the potential outcome can be controlled by the rate of formation of product which is a kinetic factor
Mon Mar 16, 2020 8:13 pm
Forum: Phase Changes & Related Calculations
Topic: state functions
Replies: 9
Views: 187

### Re: state functions

State functions are independent of the path taken. Gibbs energy (G), enthalpy (H), entropy (S), heat capacity, pressure, volume, and density are all examples. Work (w) and heat (q) are not state functions.
Mon Mar 16, 2020 8:10 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Exothermic rxns and heat
Replies: 6
Views: 102

### Re: Exothermic rxns and heat

q is negative in an endothermic reaction and positive in an exothermic reaction
Sun Mar 15, 2020 1:09 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Reaction Direction
Replies: 14
Views: 255

### Re: Reaction Direction

Compare Q and K
Sun Mar 15, 2020 1:08 pm
Forum: Balancing Redox Reactions
Topic: Pt in Cell Diagram
Replies: 10
Views: 170

### Re: Pt in Cell Diagram

A solid metal has to be used as an electrode
Sun Mar 15, 2020 1:07 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: pH of acids
Replies: 11
Views: 300

### Re: pH of acids

Strong acids have higher percent ionization and as a result there is more h3o+ in solution, leading to a lower ph value
Sun Mar 15, 2020 1:06 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: final review slide 4
Replies: 4
Views: 129

### Re: final review slide 4

You subtract the mol of gas formed and the mol of gas reacting
Sun Mar 15, 2020 1:05 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: spontaneity
Replies: 4
Views: 88

### Re: spontaneity

If delta g is negative it will be spontaneous in the forward direction and if it is positive the reverse will be spontaneous
Sun Mar 15, 2020 1:03 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: catalyst vs intermediate
Replies: 3
Views: 45

### Re: catalyst vs intermediate

A catalyst isn’t used up whereas an intermediate gets formed during an elementary step then used up and does not appear in the overall reaction
Sun Mar 15, 2020 1:02 pm
Forum: Second Order Reactions
Topic: 2nd order
Replies: 6
Views: 175

### Re: 2nd order

It is second order if two first order reactants affect the rate constant
Sun Mar 08, 2020 6:40 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Kelvin or Celsius?
Replies: 47
Views: 974

### Re: Kelvin or Celsius?

kelvin
Sun Mar 08, 2020 6:36 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst
Replies: 10
Views: 107

### Re: Nernst

Ecell=E*cell-(RT/nF)lnQ
Sun Mar 08, 2020 6:32 pm
Forum: First Order Reactions
Topic: Half Life
Replies: 8
Views: 62

### Re: Half Life

the initial concentration cancels in the derivation
Sun Mar 08, 2020 6:30 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: thermo or kinetics?
Replies: 9
Views: 141

### Re: thermo or kinetics?

for kinetics look at how the reaction progress and for thermodynamics look at the initial and final states
Sun Mar 08, 2020 6:29 pm
Forum: Balancing Redox Reactions
Topic: Oxidizing and Reducing
Replies: 5
Views: 47

### Re: Oxidizing and Reducing

the more positive potential is the reduction half reaction and the more negative is the oxidation reaction
Sun Mar 01, 2020 6:27 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge
Replies: 3
Views: 45

### Re: Salt Bridge

a pourous bridge
Sun Mar 01, 2020 6:25 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: N value
Replies: 7
Views: 72

### Re: N value

N is the number of mol of electrons transferred.
Sun Mar 01, 2020 6:24 pm
Forum: Balancing Redox Reactions
Topic: Anode and Cathode
Replies: 9
Views: 94

### Re: Anode and Cathode

the more negative half reaction is the anode and the more positive half reaction is the cathode.
Sun Mar 01, 2020 6:22 pm
Forum: Balancing Redox Reactions
Topic: Oxidizing/reducing agent
Replies: 18
Views: 220

### Re: Oxidizing/reducing agent

An oxidizing agent is stronger oxidizing than its redox couple and will undergo reduction itself. A reducing agent is more stronger reducing than its redox couple and will undergo oxidation itself.
Sun Mar 01, 2020 6:20 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Concentration Cells
Replies: 4
Views: 56

### Re: Concentration Cells

in a concentration cell the two electrodes have the same composition but different compositions. By measuring Ecell the concentration of the left electrode can be determined. If this concentration is less than at the right, then Ecell will approach 0 and the right electrode will be the cathode.
Sun Feb 23, 2020 7:40 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: standard conditions
Replies: 8
Views: 71

### Re: standard conditions

standard conditions means 1M concentration, 1 bar pressure, and at a temperature of 273.15K
Sun Feb 23, 2020 7:39 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: voltage
Replies: 8
Views: 67

### Re: voltage

voltage is a measure of the potential difference between two electrodes
Sun Feb 23, 2020 7:38 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Half reactions
Replies: 13
Views: 129

### Re: Half reactions

you break up a full redox reactions into two separate "half reactions" that show the oxidation and reduction reactions
Sun Feb 23, 2020 7:37 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L.5 b)
Replies: 5
Views: 44

### Re: 6L.5 b)

you include platinum because it would be used as a salt bridge in the galvanic cell
Sun Feb 23, 2020 7:35 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox EQs
Replies: 10
Views: 108

### Re: Balancing Redox EQs

it depends on the solution. If it is an acidic solution use H+ and if it is a basic solution use OH-
Sun Feb 09, 2020 9:14 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE BOX
Replies: 27
Views: 251

### Re: ICE BOX

x is small when its less than 10^-3 of initial concentration of acid or base
Sun Feb 09, 2020 9:11 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Intensive vs. Extensive
Replies: 15
Views: 323

### Re: Intensive vs. Extensive

intensive properties are independent of size and extensive properties are dependent on size
Sun Feb 09, 2020 9:10 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Reversible expansion
Replies: 3
Views: 35

### Re: Reversible expansion

isothermal reversible expansion is at constant temperature and reversible expansion is at constant pressure
Sun Feb 09, 2020 9:08 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta U
Replies: 7
Views: 85

### Re: Delta U

isothermal compression or expansion
Sun Feb 02, 2020 6:57 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calculating q
Replies: 5
Views: 71

### Re: Calculating q

it depends on if you're calculating heat capacity, specific heat capacity, or molar heat capacity
Sun Feb 02, 2020 6:55 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: extensive property
Replies: 12
Views: 119

### Re: extensive property

extensive properties depend on the amount of material. examples are mass and volume
Sun Feb 02, 2020 6:54 pm
Forum: Calculating Work of Expansion
Topic: work integral
Replies: 6
Views: 59

### Re: work integral

integral calculus is used when we don't have constant pressure
Sun Feb 02, 2020 6:52 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ka approximation
Replies: 6
Views: 52

### Re: Ka approximation

check the percent ionization. if it is smaller than 5% than the approximation is valid
Sun Feb 02, 2020 6:51 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: accuracy of bond enthalpies
Replies: 8
Views: 84

### Re: accuracy of bond enthalpies

averages are used for molecules that are not diatomic
Sun Jan 19, 2020 10:35 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 5J.1
Replies: 4
Views: 42

### Re: 5J.1

The partial pressure of a reactant is decreased in this system in dynamic equilibrium. Therefore Q temporarily rises above K and the reactants are favored until Q=K. In this example this means the partial pressure of CO2 decreases until equilibrium is met.
Sun Jan 19, 2020 10:30 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Priciple
Replies: 4
Views: 39

### Re: Le Chatelier's Priciple

No. The activities of liquids and solid do not affect the K value of the reaction
Sun Jan 19, 2020 10:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5% rule
Replies: 8
Views: 71

### Re: 5% rule

You calculate initial concentration/equilibrium concentration by plugging in your approximated x-value. If this value is greater than 0.05 you must solve the cubic equation.
Sun Jan 19, 2020 10:26 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE Tables
Replies: 13
Views: 96

### Re: ICE Tables

Oftentimes H2O is in excess. Also if it H2O were to be in liquid or solid form we wouldn't include it in the ICE table, as its activity would simply be 1.
Sun Jan 19, 2020 10:24 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: K less than 10^-3
Replies: 5
Views: 55

### Re: K less than 10^-3

This means there are more reactants at Eq and it sits to the left