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. Get Out of the Black<br />Brian Carr<br />
  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.<br />From http://dc.doe.in.gov/Standards/AcademicStandards/StandardSearch.aspx<br />Activity link: http://www.sciencenetlinks.com/lessons.php?DocID=117<br />Similar video:<br />http://www.youtube.com/watch?v=QsjLhD3hcqQ<br />Indiana Science Standard<br />
  3. 3. Chromatography - A technique used to separate the components of a chemical mixture by moving the mixture along a stationary material.<br />Soluble – capable of being dissolved or liquefied.<br />Solvent – a substance that can dissolve another substance. Water is the most common solvent.<br />Definitions taken from the science dictionary portion of http://dictionary.reference.com/<br />Vocabulary<br />
  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.<br />The keys to “cooperative discovery” is to communicate well and to listen and respect the findings and thoughts of others.<br />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.<br />Background<br />
  5. 5. You will perform these steps with one to three partners. Each student will do one of their own.<br />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.<br />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.<br />Procedure<br />
  6. 6. Push one of the rolled up pieces of paper towel through the hole in the filter paper.<br />Pour about an inch of water into the bottom of the cup.<br />Place the filter paper at the top of the cup – the rolled up paper towel should dip into the water.<br />Now, as you wait, discuss with your partner(s) what you think will happen to your assembly. Note your hypotheses on the next slide.<br />Hint: it will take about 10 to 15 minutes for results to begin, so you have plenty of time to discuss.<br />Procedure<br />
  7. 7. Student Hypotheses<br />
  8. 8. What did the water do?<br />What happened to the black ink? Can you make any observations about what makes up black ink?<br />Does everybody’s experiment look the same?<br />Record your thoughts on the next slide.<br />Observation Questions<br />
  9. 9. Student observations<br />
  10. 10. Which entry best describes what happened in your experiment?<br /> A – My designs became bigger.<br /> B – My designs separated into different colors.<br /> C – The black ink ran onto the paper towel.<br /> D – Nothing of interest happened.<br />Assessment question<br />
  11. 11. What do you think would happen with different color ink? Try it out.<br />Did you and your partners have different designs? (lines, dots, etc.) Did the design or shape make a difference?<br />Can you think of different ways of setting up the experiment? (think materials, process, etc.)<br />Follow up questions<br />

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