Search found 27 matches

by Phi Phi Do 2E
Fri Mar 16, 2018 2:54 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation
Replies: 3
Views: 269

Arrhenius Equation

When deriving the Arrhenius equation do we use k1/k2 or k2/k1?
by Phi Phi Do 2E
Fri Mar 16, 2018 1:44 pm
Forum: *Enzyme Kinetics
Topic: Final-Collision Theory
Replies: 3
Views: 425

Re: Final-Collision Theory

no we don't
by Phi Phi Do 2E
Fri Mar 16, 2018 1:41 pm
Forum: General Rate Laws
Topic: Exponential
Replies: 1
Views: 122

Exponential

Should we study the exponential form of the first order rate law?
by Phi Phi Do 2E
Sun Mar 11, 2018 1:08 am
Forum: *Enzyme Kinetics
Topic: Enzymes
Replies: 8
Views: 583

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.
by Phi Phi Do 2E
Sun Mar 11, 2018 1:06 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: steady state vs. equilibrium
Replies: 1
Views: 98

steady state vs. equilibrium

What are the main differences between the steady state and pre-equilibrium approaches?
by Phi Phi Do 2E
Sun Mar 11, 2018 1:03 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Activation Energies
Replies: 1
Views: 105

Activation Energies

Does the number of activation energy barriers relate to the reaction order?
by Phi Phi Do 2E
Sun Mar 04, 2018 10:46 pm
Forum: Second Order Reactions
Topic: Half life constant and Rate reaction constant
Replies: 4
Views: 212

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.
by Phi Phi Do 2E
Sun Mar 04, 2018 10:42 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: k units [ENDORSED]
Replies: 7
Views: 315

k units [ENDORSED]

Why is the constant K in different units depending on the rate order?
by Phi Phi Do 2E
Sun Mar 04, 2018 10:41 pm
Forum: Zero Order Reactions
Topic: Half life and rate order
Replies: 4
Views: 186

Half life and rate order

How does finding the half life of a reaction correlate to the rate order?
by Phi Phi Do 2E
Sat Feb 24, 2018 9:32 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: E of a Redox [ENDORSED]
Replies: 5
Views: 508

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.
by Phi Phi Do 2E
Sat Feb 24, 2018 9:29 pm
Forum: Balancing Redox Reactions
Topic: Oxidation state
Replies: 4
Views: 183

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?
by Phi Phi Do 2E
Sat Feb 24, 2018 9:26 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: reducing power?
Replies: 5
Views: 232

reducing power?

How do I calculate reducing power and what is the concept behind it? Does it have anything to do with electronegativity?
by Phi Phi Do 2E
Sun Feb 11, 2018 10:07 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Cell potential
Replies: 2
Views: 122

Cell potential

How is cell potential related to Gibbs free energy?
by Phi Phi Do 2E
Sun Feb 11, 2018 10:03 pm
Forum: Balancing Redox Reactions
Topic: Oxidation
Replies: 5
Views: 280

Oxidation

What is the concept behind the oxidation number?
by Phi Phi Do 2E
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: 88

Entropy

Why is Kb the same as the R constant in the entropy equation?
by Phi Phi Do 2E
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: 157

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.
by Phi Phi Do 2E
Sat Feb 03, 2018 9:27 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Entropy [ENDORSED]
Replies: 5
Views: 303

Re: Entropy [ENDORSED]

Entropy can increase when molecules are broken down.
by Phi Phi Do 2E
Sat Feb 03, 2018 9:21 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: entropy vs. Degeneracy
Replies: 4
Views: 197

entropy vs. Degeneracy

What is the main difference between entropy and degeneracy?
by Phi Phi Do 2E
Sun Jan 28, 2018 10:01 pm
Forum: Phase Changes & Related Calculations
Topic: degeneracy [ENDORSED]
Replies: 7
Views: 215

degeneracy [ENDORSED]

Can someone please explain more about the concept of degeneracy and how that relates to entropy?
by Phi Phi Do 2E
Sun Jan 28, 2018 9:58 pm
Forum: Phase Changes & Related Calculations
Topic: Endothermic or Exothermic
Replies: 20
Views: 557

Re: Endothermic or Exothermic

Condensation is an exothermic reaction because heat is being released during the phase change from a gas to liquid.
by Phi Phi Do 2E
Sun Jan 28, 2018 9:43 pm
Forum: Phase Changes & Related Calculations
Topic: The universe
Replies: 9
Views: 347

The universe

Why is the universe an isolated system?
by Phi Phi Do 2E
Sat Jan 20, 2018 9:56 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy
Replies: 2
Views: 117

Re: Enthalpy

PV is also negative because as work is being done by the system, it is losing energy.
by Phi Phi Do 2E
Sat Jan 20, 2018 9:54 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: q(sys) = -q(surr)
Replies: 3
Views: 365

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...
by Phi Phi Do 2E
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: 136

Heat Capacities

How do you differentiate molar heat capacity from specific heat capacity?
by Phi Phi Do 2E
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: 118

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.
by Phi Phi Do 2E
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: 86

Standard State

How can you determine an element's standard state? Do the bond formations and formal charges contribute?
by Phi Phi Do 2E
Thu Jan 11, 2018 10:11 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Sublimation
Replies: 4
Views: 226

Sublimation

Can somebody explain to me more about the concept of sublimation?

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