Search found 11 matches

by Lauren Holland 1A
Sun Mar 13, 2016 12:23 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Adiabatic
Replies: 1
Views: 253

Adiabatic

When a question states that it is adiabatic, does that just mean that q=0?
Also does this just mean that the reaction takes place in an isolated system?
Thanks!
by Lauren Holland 1A
Sat Mar 05, 2016 8:57 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Benzene and phenol
Replies: 1
Views: 313

Benzene and phenol

I know we haven't specifically talked about benzene rings, but will we be expected to know what it is? Same with phenol (benzene ring with a -OH attached)? Also, I read that these molecules are planar (by definition of aromaticity) does that mean that these are in their most stable form because of t...
by Lauren Holland 1A
Sun Feb 28, 2016 8:19 pm
Forum: *Alkanes
Topic: Tert versus neo
Replies: 1
Views: 278

Tert versus neo

I'm still a little confused on the difference between tert and neo substituents. A little clarification would be great! Thanks!
by Lauren Holland 1A
Sun Feb 21, 2016 4:10 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Graphing reactions
Replies: 2
Views: 383

Graphing reactions

In the textbook it asks to graph reactions with the y-axis being potential energy and the x-axis being time or progress of the reaction. In the course reader it always has Gibbs Free Energy as the Y-axis. Does this make a deference, or is it pretty much interchangeable?
by Lauren Holland 1A
Sun Feb 14, 2016 8:03 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: homework question 69
Replies: 1
Views: 640

homework question 69

A reaction rate increases by a factor of 1000. in the presence of a catalyst at 25C. The activation energy of the original pathway is 98 kj/mol. What is the activation energy of the new pathway, all other factors are equal? In practice, the new pathway also has a different pre-exponential factor. Th...
by Lauren Holland 1A
Sat Feb 06, 2016 8:59 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 2011 Midterm Question 6A
Replies: 1
Views: 241

2011 Midterm Question 6A

This question asks which half reactions you would use to create a battery with the largest voltage. The answer is the most negative and most positive half reactions. It this just because of the equation: E(cell)=E(cathode)-E(anode)? I think this is a really basic question, but I want to just make su...
by Lauren Holland 1A
Sat Jan 30, 2016 3:25 pm
Forum: Balancing Redox Reactions
Topic: Redox reactions in Basic or Acidic conditions
Replies: 3
Views: 1794

Redox reactions in Basic or Acidic conditions

I was looking at the examples on page 563-569 in the textbook and there are two different situations presents. The first is about balancing redox reactions in acidic solutions and the second is in basic solution. I don't quite understand how the acidity/basicity of the solution affects the redox rea...
by Lauren Holland 1A
Sun Jan 24, 2016 10:52 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: question 8.33
Replies: 1
Views: 302

question 8.33

I know that this question wasn't assigned, but I was curious about how to approach it.
33. Predict the contribution to the heat capacity C(v,m) made by molecular motions of each of the following atoms and molecules:
(a) HCN
(b) C2H6
(c) Ar
(d) HBr

Thanks!
by Lauren Holland 1A
Thu Jan 14, 2016 4:45 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Question 8.99
Replies: 1
Views: 355

Question 8.99

Question: Hydrochloric acid oxidizes Zinc metal in a reaction that produces hydrogen gas and chloride ions. A piece of Zn metal mass 8.5 grams is dropped into an apparatus containing 800 mL of .500 M HCl. If the initial temperature of the HCL solution is 25C, what is the final temp? Assume that the ...
by Lauren Holland 1A
Sat Jan 09, 2016 11:54 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.51 Enthalpy densisty
Replies: 1
Views: 373

8.51 Enthalpy densisty

For this question it asks to find the enthalpy of the reaction of the combustion of TNT by using the enthalpies of formation of the products. The chemical equation is: 4 C7H5N3O6 + 21 O2 --> 28 CO2 + 10 H2O + 6 N2 To start you simply subtract the products from the reactants (using moles times enthal...
by Lauren Holland 1A
Tue Nov 24, 2015 4:47 pm
Forum: Lewis Acids & Bases
Topic: VIDEO: Lewis acids and bases review
Replies: 1
Views: 371

VIDEO: Lewis acids and bases review

Lewis acids and bases review.mp4 [ 30.56 MiB | Viewed 313 times ]

https://youtu.be/x0tniAjcDu8

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