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7th Grade Core
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Scientists use their five senses (smell, sight, touch, taste, hearing) to make observations.  They also use scientific equipment (microscopes, balances, graduated cylinders) to make more exact observations.   In this lab you will use your senses (except taste) and scientific equipment to make observations and then use your observations to make predictions about density.

When liquids are mixed the most dense or compact liquid will settle to the bottom of the container and the less dense liquid will float on top. To determine the relative densities of several liquids you can place them in the same container and watch to see how these liquids will layer

Materials:  (Instructions to prepare the liquids)

  • Liquid A (red)
  • Liquid B (blue)
  • Liquid C  (clear)
  • Graduated cylinder
  • Balance
  • Thermometers
  • Safety goggles
  • Paper towels or cloths (clean up)
  • Beakers
  • Stirring Rods
Safety concerns: icon icon Be sure to keep all chemical, and glassware safety rules. Remember not to put a stopper into any flask unless given direct instruction by your teacher.


  1. Predict which liquid is the most dense and which is the least dense.
  2. Make and record observations using your senses (except taste) and scientific equipment.
  3. Record your observations about which liquid is the most and which is the least dense.
  4. Add 10 mL of each liquid to a graduated cylinder.
  5. Record the results (the order of the liquid layers).
  6. Try adding the liquids to the graduated cylinder in different orders. Check your results!


1. Which liquid was most dense?

2. Which liquid was least dense?

3. By adding the liquids in different orders, was the layering affected?

4. Did you correctly predict the densities of the liquids?

Review science safety rules here.

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Teachers should view the Teacher Site Map to relate Sci-ber text and the USOE 7th grade science core.

Updated October 24, 2008 by: Glen Westbroek

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