Search found 8 matches
- Sun Mar 06, 2016 11:42 pm
- Forum: *Nucleophilic Substitution
- Topic: SN2 carbon-hydrogen bonds
- Replies: 1
- Views: 1394
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.
- Sun Feb 28, 2016 8:09 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Arrhenius Equation
- Replies: 1
- Views: 441
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...
- Sun Feb 21, 2016 10:21 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3694435
Re: Chemistry Jokes
Organic chemistry is difficult. Those who study it have alkynes of trouble.
- Sat Feb 06, 2016 10:51 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell potential
- Replies: 1
- Views: 317
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...
- Sun Jan 31, 2016 2:18 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Salt Bridge Effectiveness
- Replies: 1
- Views: 1392
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...
- Sun Jan 24, 2016 8:06 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Biochemical systems- irreversible/reversible
- Replies: 1
- Views: 387
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 ...
- Sun Jan 17, 2016 5:27 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Reversible Processes examples
- Replies: 1
- Views: 538
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...
- Sun Jan 10, 2016 6:27 pm
- Forum: Phase Changes & Related Calculations
- Topic: Example in course reader
- Replies: 2
- Views: 536
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...