Search found 27 matches
- Fri Mar 16, 2018 2:54 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Arrhenius Equation
- Replies: 3
- Views: 625
Arrhenius Equation
When deriving the Arrhenius equation do we use k1/k2 or k2/k1?
- Fri Mar 16, 2018 1:44 pm
- Forum: *Enzyme Kinetics
- Topic: Final-Collision Theory
- Replies: 3
- Views: 936
Re: Final-Collision Theory
no we don't
- Fri Mar 16, 2018 1:41 pm
- Forum: General Rate Laws
- Topic: Exponential
- Replies: 1
- Views: 334
Exponential
Should we study the exponential form of the first order rate law?
- Sun Mar 11, 2018 1:08 am
- Forum: *Enzyme Kinetics
- Topic: Enzymes
- Replies: 8
- Views: 1715
Re: Enzymes
enzymes generally lower the activation energy because it would decrease the energy barrier that needs to be overcome in order for the reaction to begin. Thehrefore, because enzymes increase reaction rate, the activation energy is lowered for it to do so.
- Sun Mar 11, 2018 1:06 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: steady state vs. equilibrium
- Replies: 1
- Views: 367
steady state vs. equilibrium
What are the main differences between the steady state and pre-equilibrium approaches?
- Sun Mar 11, 2018 1:03 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Activation Energies
- Replies: 1
- Views: 320
Activation Energies
Does the number of activation energy barriers relate to the reaction order?
- Sun Mar 04, 2018 10:46 pm
- Forum: Second Order Reactions
- Topic: Half life constant and Rate reaction constant
- Replies: 4
- Views: 682
Re: Half life constant and Rate reaction constant
yes, order does matter when you are solving for k. That is why the units differ for the k value in each rate order.
- Sun Mar 04, 2018 10:42 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: k units [ENDORSED]
- Replies: 7
- Views: 1274
k units [ENDORSED]
Why is the constant K in different units depending on the rate order?
- Sun Mar 04, 2018 10:41 pm
- Forum: Zero Order Reactions
- Topic: Half life and rate order
- Replies: 4
- Views: 623
Half life and rate order
How does finding the half life of a reaction correlate to the rate order?
- Sat Feb 24, 2018 9:32 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: E of a Redox [ENDORSED]
- Replies: 5
- Views: 1014
Re: E of a Redox [ENDORSED]
E of a redox is an intensive property meaning that it does not matter the size or amount of material so there is no need to multiply it to another number.
- Sat Feb 24, 2018 9:29 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation state
- Replies: 4
- Views: 567
Oxidation state
To calculate oxidation state in half reactions. Do we have to multiply the charges by the coefficient to find the total oxidation state?
- Sat Feb 24, 2018 9:26 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: reducing power?
- Replies: 5
- Views: 2479
reducing power?
How do I calculate reducing power and what is the concept behind it? Does it have anything to do with electronegativity?
- Sun Feb 11, 2018 10:07 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Cell potential
- Replies: 2
- Views: 1799
Cell potential
How is cell potential related to Gibbs free energy?
- Sun Feb 11, 2018 10:03 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation
- Replies: 5
- Views: 871
Oxidation
What is the concept behind the oxidation number?
- Sun Feb 11, 2018 10:01 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Entropy
- Replies: 1
- Views: 263
Entropy
Why is Kb the same as the R constant in the entropy equation?
- Sat Feb 03, 2018 9:34 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy calculated from Bonds vs Enthalpy of formation
- Replies: 3
- Views: 469
Re: Enthalpy calculated from Bonds vs Enthalpy of formation
This is because you are adding the average enthalpies within the bonds. Therefore, when you add up the total enthalpies, it is slightly inaccurate.
- Sat Feb 03, 2018 9:27 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Entropy [ENDORSED]
- Replies: 5
- Views: 2054
Re: Entropy [ENDORSED]
Entropy can increase when molecules are broken down.
- Sat Feb 03, 2018 9:21 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: entropy vs. Degeneracy
- Replies: 4
- Views: 574
entropy vs. Degeneracy
What is the main difference between entropy and degeneracy?
- Sun Jan 28, 2018 10:01 pm
- Forum: Phase Changes & Related Calculations
- Topic: degeneracy [ENDORSED]
- Replies: 7
- Views: 837
degeneracy [ENDORSED]
Can someone please explain more about the concept of degeneracy and how that relates to entropy?
- Sun Jan 28, 2018 9:58 pm
- Forum: Phase Changes & Related Calculations
- Topic: Endothermic or Exothermic
- Replies: 20
- Views: 2036
Re: Endothermic or Exothermic
Condensation is an exothermic reaction because heat is being released during the phase change from a gas to liquid.
- Sun Jan 28, 2018 9:43 pm
- Forum: Phase Changes & Related Calculations
- Topic: The universe
- Replies: 9
- Views: 1112
The universe
Why is the universe an isolated system?
- Sat Jan 20, 2018 9:56 pm
- Forum: Phase Changes & Related Calculations
- Topic: Enthalpy
- Replies: 2
- Views: 343
Re: Enthalpy
PV is also negative because as work is being done by the system, it is losing energy.
- Sat Jan 20, 2018 9:54 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: q(sys) = -q(surr)
- Replies: 3
- Views: 2583
Re: q(sys) = -q(surr)
The zeroeth Law of Thermodynamics states that heat flows from the hotter object to the cooler object. When it is flowing from one object to another, it flows from the system to the surroundings. When releasing heat, it is an exothermic process which is a negative value and so you would use the q(sys...
- Tue Jan 16, 2018 7:49 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Heat Capacities
- Replies: 6
- Views: 368
Heat Capacities
How do you differentiate molar heat capacity from specific heat capacity?
- Sun Jan 14, 2018 6:36 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: reaction enthalpies
- Replies: 3
- Views: 252
Re: reaction enthalpies
You only need to change the sign because the destinations are reversed now. Point B goes back to point A as opposed to the forward reaction. This only causes a sign change because enthalpy is a state function and only depends on the state of the reaction and disregards the path.
- Sun Jan 14, 2018 6:31 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard State
- Replies: 1
- Views: 133
Standard State
How can you determine an element's standard state? Do the bond formations and formal charges contribute?
- Thu Jan 11, 2018 10:11 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Sublimation
- Replies: 4
- Views: 545
Sublimation
Can somebody explain to me more about the concept of sublimation?