Search found 8 matches

by DNguyen3G
Sun Mar 06, 2016 11:42 pm
Forum: *Nucleophilic Substitution
Topic: SN2 carbon-hydrogen bonds
Replies: 1
Views: 665

Re: SN2 carbon-hydrogen bonds

The different bond shapes are used to show the 3-D Lewis Structure in 2-D. They show the way in which atoms of a molecule are arranged in space. A broken wedge means that the hydrogen atom is behind the page and the completely filled in wedge means that the hydrogen atom is out in front of page.
by DNguyen3G
Sun Feb 28, 2016 8:09 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation
Replies: 1
Views: 256

Re: Arrhenius Equation

The constant A deals with the frequency of molecule collisions in the correct orientation and with enough energy to initiate a reaction. It is determined experimentally, varying with different reactions. In some problems, it is ignored because it isn't directly involved in relating temperature and a...
by DNguyen3G
Sun Feb 21, 2016 10:21 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1123276

Re: Chemistry Jokes

Organic chemistry is difficult. Those who study it have alkynes of trouble.
by DNguyen3G
Sat Feb 06, 2016 10:51 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell potential
Replies: 1
Views: 177

Re: Cell potential

How does the negative or positive values either designate the half reaction as being electron donating or electron receiving. 14.6 page 579-580 is somewhat unclear to me! The negative or positive values don't necessarily designate the half reaction as electron donating or electron receiving; however...
by DNguyen3G
Sun Jan 31, 2016 2:18 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge Effectiveness
Replies: 1
Views: 685

Re: Salt Bridge Effectiveness

The effectiveness of a salt bridge is determined by the concentration of the electrolyte solution. If the concentration is below saturation, an increase would also increase conductivity, but if the electrolyte concentration is beyond saturation, conductivity is lowered. The salt bridge should be a r...
by DNguyen3G
Sun Jan 24, 2016 8:06 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Biochemical systems- irreversible/reversible
Replies: 1
Views: 201

Re: Biochemical systems- irreversible/reversible

We can analyze how irreversible a process is and what is necessary to maximize efficiency, but there are no true reversible processes. In practice, all real processes are irreversible although some can be good approximation of reversible ones if you go really slow. Thermodynamics goes a long way in ...
by DNguyen3G
Sun Jan 17, 2016 5:27 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Reversible Processes examples
Replies: 1
Views: 338

Re: Reversible Processes examples

Of course we can analyze how irreversible a process was and what is necessary to maximize efficiency, but there are no true reversible processes. In practice, all real processes are irreversible although some can be good approximation of reversible ones if you go really slow. Thermodynamics goes a l...
by DNguyen3G
Sun Jan 10, 2016 6:27 pm
Forum: Phase Changes & Related Calculations
Topic: Example in course reader
Replies: 2
Views: 277

Re: Example in course reader

The change in enthalpies have different signs because one reaction requires heat while the other releases heat. Breaking bonds requires energy, making it endothermic and resulting in a positive change in energy; while forming bonds releases energy, making it exothermic and resulting in a negative ch...

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