Search found 58 matches
- Fri Mar 16, 2018 4:39 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: porous disk
- Replies: 3
- Views: 453
Re: porous disk
in a cell diagram?
- Fri Mar 16, 2018 4:38 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: porous disk
- Replies: 3
- Views: 453
porous disk
What is a porous disk?
- Fri Mar 16, 2018 4:29 pm
- Forum: Balancing Redox Reactions
- Topic: Basic conditions with OH
- Replies: 3
- Views: 416
Re: Basic conditions with OH
awesome! thank you!
- Fri Mar 16, 2018 3:08 pm
- Forum: Balancing Redox Reactions
- Topic: increasing pH
- Replies: 1
- Views: 315
increasing pH
why would increasing the pH of the solution increase the cell potential?
- Fri Mar 16, 2018 3:06 pm
- Forum: Balancing Redox Reactions
- Topic: Basic conditions with OH
- Replies: 3
- Views: 416
Basic conditions with OH
This is probably from 14A, but how can you get the concentration of OH and the pOH, when you are given the pH value ?
- Fri Mar 16, 2018 3:04 pm
- Forum: Calculating Work of Expansion
- Topic: Conversion of R
- Replies: 7
- Views: 1042
Re: Conversion of R
what if pressure was not given to you? Would you use 8.314?
- Fri Mar 16, 2018 2:15 pm
- Forum: Calculating Work of Expansion
- Topic: Conversion of R
- Replies: 7
- Views: 1042
Conversion of R
When using the Pv=nRt formula, do you represent R as 8.314 or 8.206 x10^-2?
- Sun Mar 11, 2018 5:40 pm
- Forum: Balancing Redox Reactions
- Topic: redox
- Replies: 6
- Views: 917
redox
How do you determine the oxidizing and reducing agent of a reaction?
- Sun Mar 11, 2018 3:10 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Elementary Step
- Replies: 4
- Views: 1048
Elementary Step
What exactly is the definition of an elementary step? How does it relate to the concept of rate laws?
- Sat Mar 03, 2018 2:57 pm
- Forum: General Rate Laws
- Topic: rate law
- Replies: 3
- Views: 494
rate law
How do you determine the rate law for a reaction with more than one reactant?
- Sat Mar 03, 2018 2:52 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Forward/Reverse [ENDORSED]
- Replies: 1
- Views: 316
Forward/Reverse [ENDORSED]
How is the equilibrium constant related to the forward and reverse rate constants of elementary reactions contributing to an overall reaction?
- Sat Mar 03, 2018 2:51 pm
- Forum: General Rate Laws
- Topic: half-life
- Replies: 8
- Views: 982
half-life
What is the purpose of determining a half life?
- Sat Mar 03, 2018 2:49 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Learning Models [ENDORSED]
- Replies: 1
- Views: 296
Learning Models [ENDORSED]
How does the collision model and the activated complex model account for the temperature dependence of reactions ?
- Tue Feb 20, 2018 6:48 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: homework question
- Replies: 1
- Views: 336
homework question
In homework question 14.33, why do they change the sign of the given gibbs free energy to negative?
- Tue Feb 20, 2018 4:59 pm
- Forum: Balancing Redox Reactions
- Topic: oxidation
- Replies: 4
- Views: 772
oxidation
What is the oxidation state of o2 ? is it neutral?
- Mon Feb 19, 2018 12:45 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Equilibrium constant
- Replies: 3
- Views: 491
Equilibrium constant
what is the relationship between standard cell potential and equilibrium constant of a reaction.?
- Sun Feb 18, 2018 9:35 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: n
- Replies: 3
- Views: 505
n
How do you calculate the value of n when finding gibbs free energy when given a chemical equation?
- Sun Feb 18, 2018 7:01 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing
- Replies: 3
- Views: 405
Balancing
I'm having a bit trouble adding how many electrons to a redox or oxidation half reaction.. Is there a specific method I use or an easier way to find the net charge of electrons?
- Sat Feb 10, 2018 9:19 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Third law
- Replies: 3
- Views: 477
Third law
What do you need to know about the third law of thermodynamics
- Sat Feb 10, 2018 9:19 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Gibbs free
- Replies: 5
- Views: 604
Gibbs free
What is the difference between Gibbs free energy and enthalpy ?
- Sat Feb 10, 2018 9:18 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Entropy
- Replies: 3
- Views: 530
Entropy
What equations do you need to solve entropy problems
- Tue Feb 06, 2018 8:05 pm
- Forum: Balancing Redox Reactions
- Topic: oxidation
- Replies: 4
- Views: 542
oxidation
How do you find the oxidation state number?
- Tue Feb 06, 2018 8:04 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: exothermic
- Replies: 5
- Views: 745
exothermic
If a flask turns cold, can you automatically assume that the reaction is exothermic?
- Tue Feb 06, 2018 8:03 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: formula
- Replies: 3
- Views: 395
formula
When do we use the delta s= qrev/t formula?
- Sat Jan 27, 2018 6:34 pm
- Forum: Calculating Work of Expansion
- Topic: equation
- Replies: 2
- Views: 362
equation
When do you use w=-pdeltav equation? and when do you use the equation that includes the gas constant
- Fri Jan 26, 2018 1:01 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Reversible and Irreversible
- Replies: 3
- Views: 469
Reversible and Irreversible
Is there an easier explanation to describe when a system is reversible or irreversible?
- Wed Jan 24, 2018 6:50 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Calorimetry
- Replies: 4
- Views: 524
Calorimetry
In calculating calorimetry problems, do you need to change Celcius to Kelvin in the initial and final temperatures? Or can you leave it as either or ?
- Tue Jan 16, 2018 8:59 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: First Law
- Replies: 2
- Views: 347
First Law
Can someone explain how the knowledge of the first law will help us in calculations?
- Tue Jan 16, 2018 8:57 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: reaction enthalpies
- Replies: 1
- Views: 168
reaction enthalpies
How do you find how much heat is absorbed in a reaction?
- Tue Jan 16, 2018 8:56 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: internal energy
- Replies: 5
- Views: 607
internal energy
How do you find the change of internal energy?
- Sat Jan 13, 2018 4:32 pm
- Forum: Phase Changes & Related Calculations
- Topic: Methods of Enthalpy
- Replies: 8
- Views: 877
Re: Methods of Enthalpy
Possibly, it depends on the type of question that Lavelle puts on his test, and whether or not there will be an A, B or C. Just be prepared for anything at this point.
- Sat Jan 13, 2018 4:28 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Specific Heat
- Replies: 2
- Views: 311
Specific Heat
In order to find the specific heat capacity, is there a go to formula that I need to use to solve the problems in the homework?
- Sat Jan 13, 2018 4:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Re-registering
- Replies: 1
- Views: 216
Re-registering
Ive recently reregistered my account so that aligns with my discussion in 14B, but my posts and number of posts from 14A still show on my account. Is that okay?
- Sat Jan 13, 2018 4:20 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond enthalpies
- Replies: 2
- Views: 181
Bond enthalpies
What exactly is the purpose for determining the specific bond enthalpy of a chemical reaction? What is the specific purpose?
- Sat Dec 09, 2017 9:39 pm
- Forum: Conjugate Acids & Bases
- Topic: Protanation
- Replies: 2
- Views: 395
Protanation
What is acid/base protonation ?
- Sat Dec 09, 2017 9:38 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Conjugate seesaw
- Replies: 3
- Views: 632
Conjugate seesaw
What exactly is the conjugate seesaw again?
- Sat Dec 02, 2017 10:31 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: difference in acids
- Replies: 3
- Views: 558
difference in acids
Is a Bronsted acid/base the opposite of a Lewis acid/base?
- Sat Dec 02, 2017 10:30 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: strength
- Replies: 2
- Views: 420
strength
How can you calculate which acid/base is the stronger acid/base?
- Fri Nov 24, 2017 5:19 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination number [ENDORSED]
- Replies: 3
- Views: 617
Coordination number [ENDORSED]
When finding the coordination number, do you have to always draw the lewis structure to find the number of bonds? or is there a simpler way?
- Fri Nov 24, 2017 5:18 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Oxidation number
- Replies: 1
- Views: 165
Oxidation number
How do you find the oxidation number in coordination compounds?
- Sun Nov 19, 2017 9:43 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: MOT
- Replies: 2
- Views: 323
MOT
Will we be covering Molecular orbital theory in lecture?
- Sun Nov 19, 2017 9:41 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 2
- Views: 388
Hybridization
To find hybridization, do you always have to draw a Lewis Structure?
- Tue Nov 07, 2017 7:17 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant
- Replies: 3
- Views: 665
Limiting Reactant
Is it correct to assume that the limiting reactant is always the value that has the smallest amount of moles out of the two that are being compared?
- Mon Nov 06, 2017 9:59 am
- Forum: Ionic & Covalent Bonds
- Topic: Characterization [ENDORSED]
- Replies: 2
- Views: 431
Characterization [ENDORSED]
How do you tell when a compound has more ionic character or covalent character?
- Sat Nov 04, 2017 11:04 pm
- Forum: Lewis Structures
- Topic: Formal Charge
- Replies: 1
- Views: 207
Formal Charge
For finding the formal charge, would it be okay to just do valence electrons - the total number of electrons?
- Thu Nov 02, 2017 7:16 pm
- Forum: Lewis Structures
- Topic: Expanded rules
- Replies: 4
- Views: 337
Expanded rules
How do you know which elements can be used as an expanded octet when forming a Lewis Structure?
- Sat Oct 28, 2017 4:01 pm
- Forum: Trends in The Periodic Table
- Topic: Electron affinity [ENDORSED]
- Replies: 4
- Views: 530
Electron affinity [ENDORSED]
How does electron affinity affect the elements/ electrons of an element ?
- Thu Oct 26, 2017 8:47 pm
- Forum: Trends in The Periodic Table
- Topic: Periodic Trends
- Replies: 2
- Views: 271
Periodic Trends
When a question asks, "determine the highest SECOND ionization energy" how do you determine that? Its different from determining which ionization energy is greater.
- Sat Oct 21, 2017 9:07 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Solving
- Replies: 2
- Views: 240
Solving
When solving for the Heisenberg uncertainty, does the greater than or equal to sign turn into just an equal sign?
- Mon Oct 16, 2017 8:43 pm
- Forum: DeBroglie Equation
- Topic: Conversions
- Replies: 3
- Views: 653
Conversions
When converting g to kg, do we just multiply the grams by 10^-3 ?
- Sun Oct 15, 2017 11:50 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Upcoming Test
- Replies: 5
- Views: 582
Re: Upcoming Test
Okay, also, for homework due in our discussion, will it be covering Chapter 2 or Chapter 3. Since, we have yet to start chapter 2?
- Sun Oct 15, 2017 4:23 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Upcoming Test
- Replies: 5
- Views: 582
Upcoming Test
Should we be familiar with Uncertainty problems for the test this coming week?
- Tue Oct 10, 2017 7:56 pm
- Forum: Properties of Light
- Topic: Calculating the wavelength of light [ENDORSED]
- Replies: 5
- Views: 1004
Calculating the wavelength of light [ENDORSED]
Exactly when do you use the equation E= hc/ lambda (wavelength) ?
- Sun Oct 08, 2017 6:56 pm
- Forum: Properties of Light
- Topic: Conversions
- Replies: 3
- Views: 384
Conversions
How would you convert m to nm when finding the wavelength?
- Sun Oct 08, 2017 6:41 pm
- Forum: Properties of Light
- Topic: Calculating the wavelength of light
- Replies: 2
- Views: 298
Calculating the wavelength of light
In example 1.1 of "The Quantum World", the book uses 2.998 x 10^8 as the speed of light to calculate the wavelength, however, the book gives the speed of light as 3 x 10^8 . Which one is sufficient?
- Thu Oct 05, 2017 11:34 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant info [ENDORSED]
- Replies: 6
- Views: 1056
Limiting Reactant info [ENDORSED]
When asking for the limiting reagent, is the smallest amount of moles that you get of a certain compound always going to be the limiting reagent?
- Tue Oct 03, 2017 2:34 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant- Excess
- Replies: 4
- Views: 540
Limiting Reactant- Excess
When a question asks for a limiting reactant or reagent, does finding the excess mean the other substance that has more product or is there another formula?
- Tue Oct 03, 2017 2:31 pm
- Forum: Balancing Chemical Reactions
- Topic: Combustion Question
- Replies: 9
- Views: 1396
Re: Combustion Question
Yes, combustion (anything that burns or is burning) always has the product of carbon dioxide and water.