## Search found 11 matches

Fri Feb 27, 2015 9:48 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Energy vs Reaction Progress Curve and temperature
Replies: 3
Views: 1652

### Re: Energy vs Reaction Progress Curve and temperature

You can also think of it as T increases, it will thus speed up the reaction (causing more collisions) and increasing k, the magnitude of the rate constant as well.
Tue Feb 10, 2015 5:19 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Writing a cell diagram, electrodes
Replies: 7
Views: 4373

### Re: Writing a cell diagram, electrodes

For the cell diagrams, why don't we include the numbers of the electrode (for ex: Midterm 2009 we put lH+l when there are 2H+'s?
And is it acceptable to place a comma between two of the ions rather than another line?
Sat Feb 07, 2015 9:08 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Midterm 2007 Q3B- Explanation of (delta)S total
Replies: 3
Views: 543

### Midterm 2007 Q3B- Explanation of (delta)S total

Would someone mind explaining why "delta S knot" is not a criterion for assessing the spontaneity of a reaction but the "delta S total rxn" shows that a reaction is spontaneous when it is greater than 0?
Mon Feb 02, 2015 10:05 pm
Forum: Van't Hoff Equation
Topic: Concept of Ecell vs. Estandard
Replies: 2
Views: 1373

### Concept of Ecell vs. Estandard

Would someone mind explaining exactly what it means conceptually when Ecell is greater than or less than E at the standard state?
Tue Jan 27, 2015 11:45 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Units for specific heat capacity: kJ/gC or J/gC
Replies: 3
Views: 658

### Units for specific heat capacity: kJ/gC or J/gC

For answers regarding specific heat, the course reader lists the units as kJ/gC, however is it acceptable to leave our answers as J/gC as the quiz had?
Wed Jan 21, 2015 2:31 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy Changes Based on Changes in Volume
Replies: 2
Views: 459

### Entropy Changes Based on Changes in Volume

In the equation for change in entropy (delta s)= nRln(V2/V1), when would you know whether or not there should be a negative sign in front of the "n"? Is it based on whether it's expansionary or not?
Wed Jan 21, 2015 2:07 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Generating entropy - the usage of signs
Replies: 3
Views: 382

### Re: Generating entropy - the usage of signs

When calculating entropy is it always necessary to change the temperature to Kelvin?
Wed Dec 03, 2014 4:00 pm
Forum: Naming
Topic: Naming ions
Replies: 3
Views: 421

### Naming ions

When do we know whether or not to include "ion" at the end of the coordination compound?
Fri Nov 14, 2014 9:28 am
Forum: Ionic & Covalent Bonds
Topic: What to use to find the EN difference
Replies: 4
Views: 1336

### Re: What to use to find the EN difference

For electronegativity, is Cl less electronegative than O? As in does the trend from right to left decrease EN less drastically than going downwards?
Sun Nov 02, 2014 9:25 pm
Forum: Lewis Structures
Topic: Problem 2.37c Lewis Structure for H2C(NH2)COOH
Replies: 2
Views: 2143

### Re: Problem 2.37c Lewis Structure for H2C(NH2)COOH

I had a similar question and Lewis structure to the one above^ How would we know whether to place the H on the outer structure as opposed to N or O. (Similarly with #43) Is it based on ionization?
Sun Oct 19, 2014 11:01 pm
Forum: Significant Figures
Topic: Clarifying how many sig figs needed
Replies: 9
Views: 1173

### Re: Clarifying how many sig figs needed

Hello Professor Lavelle, I was just curious as to whether or not we take into account significant digits within calculations (for ex: mass to mass, mole to mass, etc.) or whether we count significant digits at the end when providing the answer. For the most part I've tried both and haven't had a lar...

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