C:\Fakepath\Get Out Of The Black


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An elementary science experiment using chromatography; emphasizes group discussion on observations and conclusions.

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C:\Fakepath\Get Out Of The Black

  1. 1. Brian Carr
  2. 2.  3.1.5 Demonstrate the ability to work cooperatively while respecting the ideas of others and communicating one’s own conclusions about findings.  From http://dc.doe.in.gov/Standards/AcademicStandards/StandardSearch .aspx  Activity link: http://www.sciencenetlinks.com/lessons.php?DocID=117  Similar video:  http://www.youtube.com/watch?v=QsjLhD3hcqQ
  3. 3.  Chromatography - A technique used to separate the components of a chemical mixture by moving the mixture along a stationary material.  Soluble – capable of being dissolved or liquefied.  Solvent – a substance that can dissolve another substance. Water is the most common solvent. Definitions taken from the science dictionary portion of http://dictionary.reference.com/
  4. 4.  Many scientists work together in teams. This way, they can discover important things using the ideas and viewpoints of many, rather than one.  The keys to “cooperative discovery” is to communicate well and to listen and respect the findings and thoughts of others.  Scientists often have results that vary, even when they are performing the same experiment. Consider this (and potential reasons for this) while performing this experiment.
  5. 5.  You will perform these steps with one to three partners. Each student will do one of their own.  Take one of the round pieces of filter paper and cut a small hole in the middle. The hole should be about the size of the rolled up pieces of paper towel – large enough to accommodate it; small enough to hold the paper towel in place.  Use the black marker and draw dots, lines or some simple pattern on the filter paper - each partner can create their own design, but keep it simple.
  6. 6.  Push one of the rolled up pieces of paper towel through the hole in the filter paper.  Pour about an inch of water into the bottom of the cup.  Place the filter paper at the top of the cup – the rolled up paper towel should dip into the water.  Now, as you wait, discuss with your partner(s) what you think will happen to your assembly. Note your hypotheses on the next slide.  Hint: it will take about 10 to 15 minutes for results to begin, so you have plenty of time to discuss.
  7. 7.  What did the water do?  What happened to the black ink? Can you make any observations about what makes up black ink?  Does everybody’s experiment look the same?  Record your thoughts on the next slide.
  8. 8.  Which entry best describes what happened in your experiment? A – My designs became bigger. B – My designs separated into different colors. C – The black ink ran onto the paper towel. D – Nothing of interest happened.
  9. 9.  What do you think would happen with different color ink? Try it out.  Did you and your partners have different designs? (lines, dots, etc.) Did the design or shape make a difference?  Can you think of different ways of setting up the experiment? (think materials, process, etc.)
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