Paper Towel / Plastic Bag Lab Station: Part 1
1. With a pen or pencil write the word "TOP" on any one side of the paper towel square. Then, using both hands,
grab the paper towel at this edge and quickly rip it apart like this:
Answer Question 1.
2. Take one of the torn halves and turn it sideways so that you can form a rip perpendicular to the first tear. Again,
with both hands go ahead and quickly rip the paper towel apart like this:
Answer Question 2.
Paper Towel / Plastic Bag Lab Station: Part 2
Now see if you can discover if the plastic bag tears easier in the up and down direction or in the side to side
direction.
1. Hold the plastic bag up to the light. Can you see lines running in one direction. Based on what you see,
predict if the bag will tear more easily and in a straight line, in the up and down direction or from side to
side.
2. Lay the plastic bag out flat on a table and with a pen or pencil write TOP on the upper edge of the bag.
3. With a pair of scissors cut out a square of plastic that includes the word TOP. Then, with the scissors
make a little cut on the TOP edge and on one side edge like this:
STOP and make a prediction: Will the bag tear more easily in
the up and down direction, or from side to side?
4. Now, just as you did with the paper towel, quickly rip the plastic square at the little cut on the top edge. Then,
rip the plastic bag square from the little cut on the side edge.
Answer Questions 3 & 4.
Alcohol Lab Station
Place a drop of each type of alcohol on the sand paper. Record the time required for each drop
to evaporate.
Milk Lab Station
1. Pour a layer of milk in the dish about 1/2" (1 cm) deep. Room temperature milk works better
than cold milk, if you have the patience to let it sit for a while.
2. Carefully put one drop of each of the four food colors onto the surface of the milk, widely
separated, and not in the center of the dish. Something like this:
3. Very carefully drop one drop of dish soap onto the surface of the milk in the center of the
dish.
http://www.cem.msu.edu/~reusch/VirtualText/lipids.htm
http://sustainablescientist.blogspot.com/2008/04/how-soap-works.html
Cork Lab Station
1. Fill a glass half full with water. Place a cork on the surface of the water. Record your
observations.
2. Carefully overfill a glass with water so that the water’s surface is just above the rim of
the glass. Place a cork on the water’s surface. Record your observations.
Grape Lab Station
Place a peeled grape and an unpeeled grape in a glass of soda.
Record your observations.
Materials for Intermolecular Forces Lab Stations
Paper towel/plastic bag
Paper towels
Plastic bags
Scissors
Grape Lab Station
Grapes
Plastic knife
Clear plastic cup
Clear soda
Milk Lab Station
Milk
4 colors of food coloring
Dish detergent
Petrie dish (or small plate)
Cork Lab Station
Two plastic cups
1 small cork
Alcohol Lab Station
Methanol
Ethanol
Isopropyl alcohol
Black sand paper
Stop watch
Penny Station
Transfer pipette
penny