Sewer Lice

Jones, Mamie Rosa Parks Middle School

Objectives: 1. Demonstrate forces of adhesion and cohesion and equilibrium density. 2. Explain that if the pressure on a gas decreases, the gas will expand. 3. Measure the volume of CO2 in a bottle of soda pop.
4. Explain the effects of various temperatures on the solubility
of carbon dioxide.

Apparatus Needed: 4 bottles of Seltzer water or other carbonated beverage, beakers, 2 L plastic pop bottles, raisins, pop corn, spaghetti pieces (soaked for 2 hours), ring stand, ring stand clamp, large pan of water, rubber tubing, one hole rubber stopper, glass bend, tape, ice cold and hot (not boiling) water. Recommended Strategy: Place raisins in beaker, pour colored seltzer water into the beaker. Into a second beaker containing seltzer water, place pieces of broken spaghetti. Into a third beaker of seltzer water, place 8 kernels of popcorn. Observe. Remove the cap from a bottle of cold carbonated beverage. Quickly place a balloon over the mouth of the bottle and seal tightly with tape. Shake the bottle briefly. When the balloon is about the size of an apple, squeeze it firmly with both hands. Alternately squeeze and release the balloon. Calibrate a 2 liter pop bottle. Fill the bottle with water. Invert the full bottle into a large plastic tub or pan of water. Clamp the bottle to a ring stand. Remove the cap from an ice-cold bottle of seltzer water. Immediately insert a stopper (assembled for collecting gas) into the bottle of seltzer and place the other end of the rubber tubing beneath and inside of the open end of the inverted bottle. The tubing should reach all the way into the bottle. Place the bottle of seltzer water inside a large beaker of hot (but not boiling) water. Shake the seltzer water occasionally to dislodge bubbles and to speed up the process. When the production of gas has stopped, mark the level of water in the inverted bottle with a wax pencil or tape. Evaluation: 1. Explain why the raisins, spaghetti, and popcorn moved up and down through the seltzer water. 2. What happens to CO2 when the balloon was squeezed? released?

3. How much gas did you collect from the bottle of seltzer water?

4. What can you say about the solubility of a gas as temperature
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