Project #76596 - Chem discussions

Below are 3 different classmates' discussion posts. Please respond to each separate post. You can add on to what they say and add examples if possible (my professor LOVES examples). Each response should be about a paragraph long. For each separate response please include ALL sources used in APA format.

 

Original discussion question: A wet cell is constructed and the salt bridge was replaced with a piece of copper wire, does the cell produce a sustainable current and why or why not.  What is a 'cell?'  What is conductivity?  Why do we need metals to make it all work?

 

Classmate 1:

 

"No sustainable current would flow since copper would not work as a mobile channel. It also does not provide a positive or negatively charged species to balance the charge on each side." The salt bridge allows for anodes to flow into the cathode, and also allows for anions in the cathode solution to migrate to the anode and balance the charges. A chemical cell converts chemical energy to electrical energy, a wet cell is a cell that contains a liquid electrolyte; car batteries have a wet cell because cars need high power. Conductivity refers to the measure of the amount of electrical current a material can carry. Mtals are important because they easily conduct electricity and do not easily resist electric currents. 

 

Reference

 

Chapter 20, Electrochemistry. Concept 20.1. Retrieved on July 14, 2015 from http://college.cengage.com/chemistry/general/ebbing/general_chem/8e/students/protected/solutions/ch20.pdf

 

How do Salt Bridges Work?. Retrieved on July 14, 2015 from http://forums.studentdoctor.net/threads/how-do-salt-bridges-work.722358/

 

Classmate 2:

 

A cell is what converts chemical energy into electrical energy.  "Electrical conductivity is the measure of the amount of electrical current a material can carry (Helmenstine, 2015). Metals are important is cell conductivity because they are conductors of electricity and they don't easily resist electrical currents. In the case of a wet cell and the salt bridge being replaced with copper wire the cell will not produce a sustainable current, because the copper wire does not have the positively and negatively charged species that are needed to balance the charges that accumulate in each of the half cells(Cengage, n.d.). Without the salt bridge, the charge becomes imbalanced making the reaction stop and a sustainable current will not be produced. 

 

References:

Cengage. (n.d.). Retrieved July 13, 2015, from http://college.cengage.com/chemistry/general/ebbing/general_chem/8e/students/protected/solutions/ch20.pdf

Helmenstine, A. (2015). Electrical Conductivity - Chemistry Definition. Retrieved July 13, 2015, from http://chemistry.about.com/od/chemistryglossary/g/Electrical-Conductivity-Definition.htm

Woodford, C. (2014, September 8). Superconductors. Retrieved July 13, 2015, from http://www.explainthatstuff.com/superconductors.html

 

Classmate 3:

 

A simple cell is an electrochemical cell that produces electrical energy using a chemical reaction. A salt bridge is a compartment comprising of electrolytes that are essential to complete the circuit. Electrical conductivity is the measure of the quantity of electrical current a material can carry. Metals are good conductors of electricity and heat so we use metals. The salt bridge allows ion flow and maintain neutrality of the solutions. The oxidation occurs at anode and reduction at cathode and a copper wire used instead of the salt bridge will allow only the electrons to and excess of electrons will be formed in the oxidizing area and the reducing area needs electrons, a salt bridge allows movement of ions both ways and thus maintain the neutrality and effectiveness of the cell.

References:

Electrochemistry: Voltaic cells. (n.d.). Retrieved from https://www.chem.wisc.edu/deptfiles/genchem/netorial/rottosen/tutorial/modules/electrochemistry/03voltaic_cells/18_31.htm

Helmenstine, A. (n.d.). Electrical conductivity definition. Retrieved from http://chemistry.about.com/od/chemistryglossary/g/Electrical-Conductivity-Definition.htm

Electrochemistry. (n.d.). Retrieved from http://www.copley-fairlawn.org/cms/lib4/OH01001067/Centricity/Domain/78/1Electrochemistry.pdf

 

Subject Science
Due By (Pacific Time) 07/17/2015 07:00 pm
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