This Week in SCY High Chemistry

For the Week of November 26

This week we will learn more about ions and chemical energy. To illustrate these concepts, we will lean more about circuits, batteries, and chemical energy. In lecture, we will also learn to name inorganic chemicals.

The water filtration lab will be further developed. Our goal for this experiment is to develop a method that can be used to test to see if ions are present. If ions are present, then you can conlcude that your column has not filtered the salts out of your filtered water. At the end of the week or even next week, I will measure a spectrograph

Quiz: inorganic nomenclature (11/29/2007); polyatomic ions (memorization quiz --no flashcards 12/7/2007)

Objectives:

Tuesday - To continue to learn to set up simple circuits; to learn to use Ohm's law; to differentiate types of energy; to introduce inorganic nomenclature.

1. Take out Molar Mass II and Shoeboxes

2. Go over calendar.

3. Go over Element Tile Grades

3. Introduce circuits and Ohm's law.

What electrical device (besides computers and TV) are essential to society? If you have not studied electricity yet, hypothesize how electricity might work. Explain using your best educated conjectures, what needs to be present in order to produce electricity.

4. Lab/Project: Water filtration: testing for ions
KEY IDEA: Ions conduct electricity

• All notes in journal. Stamp for completeness.
  
  1. Introduce battery/circuit concept
  • voltage, current, resistance
    
  • circuit diagram
    
  2. Introduce voltmeter:
     
  3. LAB:
     
• Hypothesis: if ions conduct electricity, then if there are ions in the filtered water, the ions will complete a simple electrical circuit as evidenced by the lit LED.
• 
  
• Experiment: Create a simple circuit to demonstrate the presence of ions.
  
• Test conductivity of penny and lemon batteries to LED
  
• Test conductivity of distilled water (Control)
  
• Test conductivity of tap water
• Test conductivity of salt water
• Test conductivity of vinegar
• Test conductivity of sugar water
• Test conductivity of filtrant
  

• Data
• Voltage/current across penny battery
• Voltage/current across lemon battery
• Volume of sample 1
• Volume of sample 2
  
• Volume of recovered filtrant 1
• Volume of recovered filtrant 2

Thursday - To continue to learn naming inorganic compounds; To continue to learn to set up simple circuits to detect ions in solution.

1. Warm Up

• 
  

Project

Distilled (pure) is water in its pure state. This means that distilled water has NO dissolved ions, molecules, or organisms. In our current project, we will separate all the impurities from a sample of dirty sea water.

1. OBTAIN a sample of dirty water.
   
2. BUILD a filtration column
3. EXPERIMENT with your column: is the sample dirty, cloudy?
• Filter a sample a second time if the sample is still dirty.
  
4. RECORD results in your journal
5. TEST for ions in a clear sample of your filtered water by setting up a simple circuit.
6. RECORD results in journal.
7. OBTAIN spectrum for distilled water and compare to spectra from your sample.
   
8. WRITE UP: a formal lab report documenting our experiments
   

Homework:
Molar Mass 2 (check 11/27/2007)
Cardboard box (check 12/04/2007)
Nomenclature I (in class)
Nomencalture II (check 11/30/2007)
Make flascards of polyatomic ions, TEXT pg . 257 (Check 11/30/2007)
Element Tile Extra credit: make two new element tiles for 5pts extra credit--no essay-- (due Friday 11/30/2007)