In this lab activity we will investigate how the greenhouse effect leads to a warmer Earth. First, you will simulate the greenhouse effect. Then you will have the opportunity to design an experiment to investigate the influence of other factors on the greenhouse effect.

· Lamp with 100-watt lightbulb

· Two thermometers

· Two clear plastic 2-liter bottles

· Rubber stoppers

· Clear plastic wrap

· Rubber bands

· Timer (watch or phone)

· Measuring cups

· Glass beakers

· source (baking soda and vinegar)

1. Fill each of the 2-liter bottles with the same amount of water, filling the bottle with 1000 mL of water. Label each bottle A and B with a marker.

1. Use a black stopper to cover the top of bottle B, pushing the thermometer through the hole in the stopper.

1. DO NOT cover the top of bottle A. Place the thermometer in this bottle, approximately in the same position as for bottle B, using tape and/or rubber bands to secure it in place.

1. Place the lamp on a table, making sure the bulb is exposed (i.e., remove any lampshades). Position each bottle 1 inch from the exposed bulb. The thermometers should be shielded from direct light.

1. Turn on the light and record the temperature for each bottle once every three minute for the first 15 minutes, then once every 5 minutes until 30 minutes has passed, then once at 45 minutes.

Place 4 tablets of Alka-seltzer into the water of one bottle. Use the procedures from the basic greenhouse effect activity as a basis for your experiment.

Devise and experiment to test some addition factor. For example, you may want to examine how differences in the amount of water effect the rate of temperature change. Or maybe distance from light source. There are many possibilities, so just follow your curiosity. Write a clear hypothesis for your new experiment. Run your experiment as you did the previous two, for as long as you can before class ends.

FINAL DRAFT due Monday April 10th

You will write your second complete lab report based on the results of this lab activity.