- Using your straw, transfer the green liquid into your test tube filling
it to about ½ " (as demonstrated).
- Carefully add red liquid to the top of the green liquid in the test
tube. (This is best done by allowing the liquid to run down the side of
the test tube. If you add the liquid too fast it will mix the colors and
be more difficult to see if it is layering.)
- Observe the liquids and mark the data sheet. (Write yes if the second
liquid floats on the first liquid causing them to layer or write no if
- Repeat this process for each trial as indicated on the data sheet.
- After completing all the 2-color trials, color in the data tables that
were marked yes.
- Predict which colors could be added to make a 3-color stack.
- Experiment with 3 of the liquids. Record your trials and results.
- After finding a 3-color stack, predict how all 4 liquids will form a
- Experiment with all 4 liquids. Record your trials and results.
- Color in the final density results when you have successfully stacked
all 4 liquids.
Answer the following on a separate sheet of paper:
- Which liquid always layered at the bottom of the test tube?
- Why do you think this liquid layered below the other liquids?
- Which liquid has the lowest density?
- Where would you expect to find the liquid with the lowest density?
- Color in the final density results in the large column on the data sheet
from top to bottom