## Search found 14 matches

Fri Mar 11, 2016 9:27 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Writing Redoz Rxn and Drawing Cell
Replies: 1
Views: 318

### Re: Writing Redoz Rxn and Drawing Cell

If you are going to use the reversed value for copper, E cell = -.34V, then you do not use E cell = cathode - anode and instead just add the cathode and anode. You use E cell = cathode - anode if you keep the original E cell value and simply plug in to that equation. You should get the same answer e...
Fri Mar 11, 2016 3:12 am
Forum: Balancing Redox Reactions
Topic: Winter 2016 Midterm Q6B
Replies: 1
Views: 292

### Winter 2016 Midterm Q6B

Why is C2H5OH(aq) --> C2H4O(aq) + 2H+ + 2e- the oxidation half-reaction? Looking at the oxidation numbers from part a, I'm a little confused.
Wed Mar 02, 2016 11:04 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: Activation Energy and Temperature
Replies: 1
Views: 389

### Activation Energy and Temperature

How do you know if an organic reaction will occur at room temperature or a higher/lower temperature based on activation energy? For example, 4.30 in the organic chemistry textbook. Thank you!
Sun Feb 28, 2016 11:25 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Steric Factor
Replies: 1
Views: 1008

### Steric Factor

The Arrhenius Equation refers to a constant A that includes the number of collisions and steric factor, but what exactly is this steric factor?
Sun Feb 21, 2016 11:26 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: Activation energy and rate constant
Replies: 1
Views: 360

### Activation energy and rate constant

Why is it that the slower the rate constant k the higher the activation energy? Referring to the standard free energy of activation equation
Wed Feb 10, 2016 2:03 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Winter 2012 Midterm Q1A
Replies: 2
Views: 331

### Winter 2012 Midterm Q1A

When using qwater = mwaterCwaterdelta T, the solution shows that the temperatures are not converted from Celsius to Kelvin for delta T. Why is this conversion not necessary? If I were to convert the temperatures to cancel out units with Cwater would the answer be wrong?
Tue Feb 09, 2016 8:26 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: When to use ln vs log
Replies: 1
Views: 461

### When to use ln vs log

When can you use the Nernst equation using ln vs using log10? Can you only use ln under certain conditions?
Sun Feb 07, 2016 5:36 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Value for n
Replies: 1
Views: 579

### Value for n

When using the Nernst Equation, how do you know what value to put for n number of moles?
Sun Jan 31, 2016 3:03 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Finding Gibs free energy
Replies: 1
Views: 401

### Re: Finding Gibs free energy

Hi,

Breaking a diatomic molecule X2(g) requires energy to become 2X(g), and therefore the reaction is endothermic. This is true for other halogens as well
Tue Jan 19, 2016 10:41 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8252
Views: 1445230

### Re: Chemistry Jokes

Why does a hamburger have lower energy than a steak?

It's in the ground state.
Mon Jan 18, 2016 7:28 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: States
Replies: 3
Views: 463

### Re: States

No, that's what I was asking I just worded it incorrectly. Thank you!
Sun Jan 17, 2016 10:26 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: States
Replies: 3
Views: 463

### States

Why do molecules in the gaseous phase occupy more states than the liquid phase and the solid phase?
Sun Jan 10, 2016 8:41 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies~Clarification
Replies: 2
Views: 348

### Re: Bond Enthalpies~Clarification

Like you said, bonds that are formed have negative values since it is an exothermic process. Therefore you don't subtract the values from one another, rather you are adding negative values together. For an example of this, you could reference page 18 in the course reader
Sun Nov 29, 2015 11:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VIDEO: Quiz 2 Question 8
Replies: 1
Views: 378

Chem Video.mp4