28 February 2010

stoichiometry -- balancing chemical equations using moles from the Chem Collective from Carnegie Mellon University

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The following video gives the "big picture" of the mole and its applications. The big picture of the mole from the Chem Collect...
26 February 2010

How far is Avogadro's number in meters? (6.023 x 10^23 m)

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Avogadro's number...How big is it? Can a person count to this number in their lifetime (counting once per second)? How far away from ...
24 February 2010

Adding similar sine waves causes "BEATS"

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What happens when you add similar sine waves together? Any musician can tell you: as you tune an instrument closer and closer to the correct...
14 February 2010

Blood tests are so complicated?

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When you go to get a blood test, for what is the doctor looking? That depends on your age, gender, and symptoms. See the following website ...

Making the (almost) perfect square wave. Can it be done?

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Continue adding up sine waves until you get an almost perfect square wave. Try changing the number of terms that make up the sum. Move the ...
11 February 2010

The pH of life

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Note how narrow is the pH range of life for humans! See this link on the effect of acid rain on the pH of lakes, and how this affects the f...

Adding sines together to make a square wave

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See this site to see how to add sine waves to make a square wave: http://www.absorblearning.com/media/attachment.action?quick=qh&att=18...
09 February 2010

Trig functions: SINE

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Waves can be built up from a sum of sine functions, of the form: y = A*sin B(x-C). What does the graph of A*sin B(x-C) look like? See this ...
04 February 2010

pH and acid rain around the US

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Check out the USGS (United States Geological Survey) site regarding the effects of pH and acid rain on fish reproduction.  See: http://ga.wa...
28 January 2010

How do insects see flowers?

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Flowers, such as this Narcissus Pseudonarcissus flower (i.e., a daffodil), look startlingly different in UV (Ultraviolet) light.   Note: UV ...