Search found 30 matches
- Sun Mar 18, 2018 8:33 pm
- Forum: *Cycloalkanes
- Topic: SN2
- Replies: 1
- Views: 2271
SN2
How many steps are there in an SN2 reaction.
- Sun Mar 18, 2018 8:30 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: microstate and expansion
- Replies: 1
- Views: 396
Re: microstate and expansion
I think so.
- Sun Mar 18, 2018 8:24 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Conductor
- Replies: 1
- Views: 357
Re: Conductor
When all the substances are aqueous, so you need a solid conductor. You usually place it on the end.
- Sun Mar 11, 2018 11:57 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Equilibrium constant
- Replies: 3
- Views: 701
Equilibrium constant
What does the equilibrium constant equal to for a multi-step reaction?
- Sun Mar 11, 2018 11:52 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Ways to approach reaction mechanism
- Replies: 2
- Views: 375
Re: Ways to approach reaction mechanism
Could someone also explain the pre-equilibrium method.
- Sun Mar 11, 2018 11:50 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Adsorption
- Replies: 3
- Views: 462
Re: Adsorption
Adsorption is the adhesion of molecules on to the surface of something, and they basically form a film over the surface of the catalyst.
- Sun Mar 04, 2018 10:04 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Rate determining reaction
- Replies: 3
- Views: 431
Rate determining reaction
Do we need to know the rate determining step and the normal step of a certain reaction?
- Sun Mar 04, 2018 9:55 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: oxidizing power
- Replies: 2
- Views: 379
Re: oxidizing power
The higher their reducing potentials, the stronger their oxidizing power.
- Sun Mar 04, 2018 9:53 pm
- Forum: General Rate Laws
- Topic: Rate equations
- Replies: 3
- Views: 550
Rate equations
Do we need to know the derivations for all the rate equations?
- Sun Mar 04, 2018 9:49 pm
- Forum: First Order Reactions
- Topic: half-life
- Replies: 2
- Views: 390
Re: half-life
This is because the half-life of a first order reaction is a constant.
- Fri Feb 23, 2018 11:37 am
- Forum: First Order Reactions
- Topic: Reaction order
- Replies: 4
- Views: 619
Reaction order
How do you determine the order of a certain reaction?
- Thu Feb 22, 2018 10:39 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Electrolytic Cells
- Replies: 1
- Views: 359
Re: Electrolytic Cells
Yes, it is possible to produce gas in a electrolytic cell and the gas is usually produced at the anode.
- Thu Feb 22, 2018 10:36 am
- Forum: Balancing Redox Reactions
- Topic: Gibbs free energy of half reactions
- Replies: 4
- Views: 737
Gibbs free energy of half reactions
Can we add the Gibbs free energy of the half reactions to find the Gibbs free energy of the final reaction.
- Sun Feb 18, 2018 4:26 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Electrode potential
- Replies: 1
- Views: 282
Electrode potential
Are all electrode potentials negative?
- Sun Feb 18, 2018 4:22 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Nernst equation
- Replies: 4
- Views: 741
Nernst equation
What is the Nernst equation?
- Sun Feb 18, 2018 4:18 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: Electrolyis
- Replies: 3
- Views: 612
Re: Electrolyis
Not much. But I think you need to know the reactions.
- Sat Feb 10, 2018 7:48 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Standard potential [ENDORSED]
- Replies: 1
- Views: 191
Standard potential [ENDORSED]
Does the electrode standard potential depend on the molar equation?
- Sat Feb 10, 2018 7:44 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Oxidation
- Replies: 4
- Views: 397
Oxidation
Does oxidation take place at the anode or cathode in a galvanic cell?
- Mon Feb 05, 2018 9:34 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Delta G equal Zero [ENDORSED]
- Replies: 4
- Views: 711
Re: Delta G equal Zero [ENDORSED]
No, I don't thing so. When delta G is zero is just means that there are equal amounts of products and reactants.
- Fri Feb 02, 2018 10:19 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Exergonic [ENDORSED]
- Replies: 5
- Views: 690
Exergonic [ENDORSED]
What are some examples of exergonic reactions?
- Fri Feb 02, 2018 10:15 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Micro states
- Replies: 5
- Views: 651
Micro states
What are microstates?
- Sun Jan 28, 2018 5:14 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Boltzmann Equation Clarification
- Replies: 3
- Views: 337
Re: Boltzmann Equation Clarification
The equation shows how the distribution of molecules, atoms or ions in their various energy levels depend on the temperature of the system.
- Sun Jan 28, 2018 5:09 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Entropy [ENDORSED]
- Replies: 4
- Views: 549
Entropy [ENDORSED]
Is entropy a state function?
- Wed Jan 24, 2018 5:40 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Heat capacity question
- Replies: 5
- Views: 731
Re: Heat capacity question
I think R refers to the gas constant
- Sat Jan 20, 2018 11:49 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat Capacity Properties
- Replies: 3
- Views: 375
Re: Heat Capacity Properties
Since the definition of heat capacity is the amount of heat required to change the temperature of one unit of mass of a substance by one degree. It is therefore an intensive property because it has mass in its units. Since specific heat is always measured for one unit of mass of the substance the ma...
- Thu Jan 18, 2018 8:25 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Why is using bond enthalpies the least accurate method of finding reaction enthalpies?
- Replies: 5
- Views: 10167
Re: Why is using bond enthalpies the least accurate method of finding reaction enthalpies?
And I think the bond enthalpies are values under standard conditions, which might not always be the case.
- Thu Jan 18, 2018 8:24 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Work Equation
- Replies: 4
- Views: 533
Re: Work Equation
If you are putting work into the system (say pressing a piston into a cylinder containing a gas at a given pressure), the volume is becoming smaller, so ΔV is negative. The negative of the pressure times a negative ΔV is a positive value, which matches with the sign convention for putting work in.
- Sat Jan 13, 2018 12:22 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Bonds Formed Exothermic
- Replies: 2
- Views: 201
Re: Bonds Formed Exothermic
energy is released when bonds are formed because as the two or more atoms become one the total entropy of the system is reduced and also as the atoms come together the electron of one atom is attracted to the nucleus of the other atom and this results in a release of energy and a molecule which has ...
- Thu Jan 11, 2018 9:49 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat Capacity: molar versus specific
- Replies: 3
- Views: 2221
Re: Heat Capacity: molar versus specific
specific heat capacity is the amount of heat needed to raise the temperature of 1 gram of a substance by 1 K, whereas molar heat is the amount of heat needed to raise the temperature of 1 mole of a substance by 1 k.
- Thu Jan 11, 2018 9:27 am
- Forum: Phase Changes & Related Calculations
- Topic: General Question
- Replies: 3
- Views: 346
Re: General Question
q is the amount of heat transferred to a system, whereass H is a measure of the potential energy in the system