Oct+15+Thurs


 * Topic:** Properties of water

What is the difference between Adhesion and Cohesion?
 * Bell Ringer:** Copy & Answer the following in your notebook.


 * Lab:** Investigate the properties of water.
 * Groups of 2**

a. Retrieve a pipette and a dropper from the materials table. b. Seal the tip of the dropper. c. Fill the pipette to the “4” mark. Remember the bottom of the meniscus indicates the water level. d. Count the number of drops needed to reach a measured amount (.1. ,5 or 1ml) e. **Conduct three trials. Record these #** **in your notebook**- be sure to include the units of measurement. f. Average the #'s; show your work in your notebook. a. Lay a penny heads down on your desk. b. Use your dropper to place water, drop by drop, onto the tail side of the penny. c. Create a three-column data table to record the results in your notebook. (Trial / # drops, ml) d. Count the drops (ask your partner to tally as you drop the water). e. Complete three trials and Photograph the last trial- (this should be the best). f. Print your photo and secure it in your notebook under your data table. g. Convert drops to ml, and record the calculation in the data table. a. Retrieve the following materials: 50 ml beaker & paperclip. b. Fill the 50 ml beaker with 40 ml of water. c. Discuss a strategy for floating the paperclip on the surface of the water with your lab partner. **Write this strategy in your notebook**. d. Attempt to float the paperclip. e. Revise and record additional strategies in your notebook. f. Photograph your successful trial. g. Print your photo and secure it in your notebook under your listed strategies. 1. Compare and contrast adhesion and cohesion. 2. List two specific examples of the adhesion as it relates to the properties of water. 3. List two specific examples of the cohesion as it relates to the properties of water. Link to Google Docs and record your results from the water lab.
 * Procedure:**
 * 1) Calculate the # of drops in one ml of water.**
 * 2) Investigate the # of drops of water you can fit on the top of a penny.**
 * 3) Investigate surface tension**
 * Follow up questions (restate in notebook):**
 * Follow up assignment:**

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