Thursday, May 22, 2008
Thurs-Day 2
Bio- HW is due tomorrow BEFORE the test. Use your hw of thoroughly and accurately answering the objectives, WITH EXAMPLES, as a good preparation for what you WILL BE WRITING and SEEING on tomorrow's unit exam.
Today, we reviewed for tomorrow's exam by looking at some of the causes, effects, and solutions to some of the human impacts on the environment. We looked at specific problems of increasing the greenhouse effect (CO2 increase in the atmosphere), destruction of the ozone layer, sewage treatment, and deforestation.
Chem 7/8- we learned how to spot/label the oxidizing AGENT and reducing AGENT in a redox reaction. The oxidizing AGENT causes the OTHER reactant to be OXIDIZED/lose electrons by attracting the electrons away from said different reactant. Thus, good oxidizing agents are very electronegative (non-metals/halogens/oxygen).
The reducing AGENT causes the OTHER reactant to be REDUCED by giving up its electrons to the other reactant.
So, the substance that IS oxidized IS the REDUCING AGENT.
The substance that IS reduced IS the OXIDIZING AGENT.
We then began a discussion on separating a redox reaction into two half-reactions that occur between two separated beakers joined by a wire and a salt bridge. This is a Voltaic or Galvanic electrochemical cell and can generate electricity spontaneously via a chemical redox reaction. The electricity/electrical energy can then be used to power an electrical device (iPod, cell-phone, motor, etc.).
Chem 9- we learned how to spot/label the oxidizing AGENT and reducing AGENT in a redox reaction. The oxidizing AGENT causes the OTHER reactant to be OXIDIZED/lose electrons by attracting the electrons away from said different reactant. Thus, good oxidizing agents are very electronegative (non-metals/halogens/oxygen).
The reducing AGENT causes the OTHER reactant to be REDUCED by giving up its electrons to the other reactant.
So, the substance that IS oxidized IS the REDUCING AGENT.
The substance that IS reduced IS the OXIDIZING AGENT.
We then began a discussion on separating a redox reaction into two half-reactions that occur between two separated beakers joined by a wire and a salt bridge. This is a Voltaic or Galvanic electrochemical cell and can generate electricity spontaneously via a chemical redox reaction. The electricity/electrical energy can then be used to power an electrical device (iPod, cell-phone, motor, etc.).
Today, we reviewed for tomorrow's exam by looking at some of the causes, effects, and solutions to some of the human impacts on the environment. We looked at specific problems of increasing the greenhouse effect (CO2 increase in the atmosphere), destruction of the ozone layer, sewage treatment, and deforestation.
Chem 7/8- we learned how to spot/label the oxidizing AGENT and reducing AGENT in a redox reaction. The oxidizing AGENT causes the OTHER reactant to be OXIDIZED/lose electrons by attracting the electrons away from said different reactant. Thus, good oxidizing agents are very electronegative (non-metals/halogens/oxygen).
The reducing AGENT causes the OTHER reactant to be REDUCED by giving up its electrons to the other reactant.
So, the substance that IS oxidized IS the REDUCING AGENT.
The substance that IS reduced IS the OXIDIZING AGENT.
We then began a discussion on separating a redox reaction into two half-reactions that occur between two separated beakers joined by a wire and a salt bridge. This is a Voltaic or Galvanic electrochemical cell and can generate electricity spontaneously via a chemical redox reaction. The electricity/electrical energy can then be used to power an electrical device (iPod, cell-phone, motor, etc.).
Chem 9- we learned how to spot/label the oxidizing AGENT and reducing AGENT in a redox reaction. The oxidizing AGENT causes the OTHER reactant to be OXIDIZED/lose electrons by attracting the electrons away from said different reactant. Thus, good oxidizing agents are very electronegative (non-metals/halogens/oxygen).
The reducing AGENT causes the OTHER reactant to be REDUCED by giving up its electrons to the other reactant.
So, the substance that IS oxidized IS the REDUCING AGENT.
The substance that IS reduced IS the OXIDIZING AGENT.
We then began a discussion on separating a redox reaction into two half-reactions that occur between two separated beakers joined by a wire and a salt bridge. This is a Voltaic or Galvanic electrochemical cell and can generate electricity spontaneously via a chemical redox reaction. The electricity/electrical energy can then be used to power an electrical device (iPod, cell-phone, motor, etc.).
# posted by C @ 1:48 PM 
