Search found 50 matches
- Mon Mar 16, 2020 8:28 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ATP QUESTION ON FINAL
- Replies: 9
- Views: 874
Re: ATP QUESTION ON FINAL
K solely depended on ADP
- Mon Mar 16, 2020 8:27 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Graphs
- Replies: 3
- Views: 338
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: 38
- Views: 1438
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: 636
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: 18
- Views: 1020
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: 454
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: 36
- Views: 1513
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: 9
- Views: 675
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: 525
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: 660
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: 6
- Views: 472
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: 14
- Views: 865
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: 13
- Views: 1327
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: 9
- Views: 570
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: 19
- Views: 962
Re: Reaction Direction
Compare Q and K
- Sun Mar 15, 2020 1:08 pm
- Forum: Balancing Redox Reactions
- Topic: Pt in Cell Diagram
- Replies: 14
- Views: 876
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: 13
- Views: 1015
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: 408
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: 471
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: 242
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: 567
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: 86
- Views: 5239
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: 592
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: 507
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: 734
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: 360
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: 231
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: 445
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: 549
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: 1057
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: 313
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: 519
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: 379
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: 725
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: 310
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: 661
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: 773
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: 1314
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: 151
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: 408
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: 217
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: 612
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: 218
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: 495
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: 372
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: 229
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: 209
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: 217
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: 458
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: 282
Re: K less than 10^-3
This means there are more reactants at Eq and it sits to the left