Liquids
Follow the instructions below and record what happens (In data Table B). You will use this information
later to report on your activities.
Procedure
Activity Station 1
1. Obtain two clean slides, one glass and one polyethylene (plastic).
2. Using a micro-tip pipet, add a drop of water to each slide.
3. Using a millimeter ruler, measure the drop width and height on both slides. Record
these values in the Data Table B below.
4. Thoroughly dry the slides and repeat steps 2 and 3 using a clean micro-tip pipet and
ethyl alcohol.
5. Thoroughly dry the glass slide and polyethylene slide.
Activity Station 2
1. Obtain a second glass slide and a second polyethylene slide.
2. Wipe off the surfaces of the four slides. Place a drop of water on one glass slide and
one drop on the polyethylene slide.
3. Place the second glass slide over the first one. Place the second polyethylene slide
over the first one.
4. Compress the water between the slides. Try separating the slides (be gentle). Record
the relative force needed to separate the slides in Data Table B. Separate and dry the
four slides.
Activity Station 3
1. Obtain a disposable Petri dish. Fill the top with 10 mL of water and the bottom with
10 mL of ethyl alcohol.
2. Obtain two capillary tubes.
3. Place one capillary tube in the Petri dish with water. Use the ruler to measure, in
millimeters, the height of water in the capillary tube. Record this value in Data Table B.
4. Repeat step 11 using a new capillary tube for the Petri dish bottom containing ethyl
alcohol.
Activity Station 4
1. Use a dry erase marker to place a mark half-way up a dry erase board.
2. Fill the micro-tip pipets, one with water and one with ethyl alcohol.
3. Place a drop of each liquid at the mark. Note the path or pattern that each liquid
takes to reach the bottom. Record your observations in the Data Table.
Data Table B
Activity station 1
Micro Slide
Drop width (mm)
Water
Glass
Polyethylene
Ethyl Alcohol
Glass
Polyethylene
Drop height (mm)
Activity Station 2
Force to separate slides
Circle the best answer when comparing the two materials
Glass____ more / less
Polyethylene____ more / less
Activity Station 3
Capillary Tube
Measure the rise in each capillary tube (water and ethyl alcohol)
Capillary rise (mm)
Water ________ mm
Ethyl alcohol ________ mm
Activity Station 4
Dry Erase Board
Record the difference in pattern between water and ethyl alcohol
Pattern of water on dry erase board _______________________________________________
_____________________________________________________________________________
_____________________________________________________________________________ .
Pattern of ethyl alcohol on dry erase board __________________________________________
_____________________________________________________________________________
_____________________________________________________________________________ .