1. Making “Cents” of Cohesion
A Water Experiment

2. What is cohesion? – Copy into INB
Cohesion - attraction between molecules of the same substance
Two or more water molecules sticking together is an example of cohesion.

3. Penny Experiment – Copy into INB
Question: How many drops of water can fit on top of the penny?
Hypothesis: Write down how many drops you think will fit on top of the penny.

4. Penny Experiment – Copy into INB
Copy the table – only use one line for each row
Trial Number
Number of Drops 1 2 3
Average:

5. Penny Experiment Materials: Procedure: 1 dropper (called a pipette)
1 beaker filled with water
1 penny
Procedure:
Fill the dropper with water from the beaker
Slowly add drops of water to the top of the penny, counting each drop
Write down how many drops you could fit on the penny on your data table

6. What is adhesion?
Adhesion: Attraction between molecules of different substances
Water flowing from the bottom of a vase up to the top of a plant (flower) is an example of adhesion.