Investigation 6 Water in the Air Part 1 TG - P.177-191

REVIEW OF WATER VAPOR On your LOL respond: What is water vapor? Think: Can you see water vapor? Think: But you can see steam coming out of a boiling teakettle. Why is that? Think: Where does fog on bathroom mirrors come from? How does the dew on the outside of a glass of iced tea get there? TG- P.192-

CHALLENGE Each lab group will need to come up with an experiment to show that there is water vapor in the air around us using condensation. TG- P. 192

MATERIALS Plastic Cups Water Ice Zip bags Aluminum Foil Food Coloring Thermometers You do not need all of them, but you have access. TG- P. 192

RECORDINGS In your notes, record: 1. THE GROUP’S PLAN 2. LIST OF MATERIALS NEEDED 3. LABEL PARTS OF THE PAGE FOR OBSERVATIONS AND RESULTS. 4. HAVE PLAN APPROVED BY TEACHER BEFORE STARTING. TG- P. 192

CONDUCTING EXPERIMENT After approval, you have 20-30 minutes for full completion. Think about the question when determining if you have PROVED water vapor. Be ready to explain HOW you did so. TG- P. 192

QUESTIONS Why did you use ice? How can you tell that the condensation simply didn’t pass through the plastic or aluminum? What causes the condensation? Could you get dew from room temperature water? Using your knowledge, how do you think frog forms on the bathroom mirror if you take a hot shower? TG- P. 192-193

CLASS PRESENTATIONS EACH GROUP WILL PRESENT THEIR FINDINGS. YOU WILL NEED THE FOLLOWING INFORMATION: 1. STATEMENT OF THE CHALLENGE 2. DESCRIPTION OF WHAT YOU DID 3. STATEMENT OF YOUR CONCLUSIONS AND EVIDENCE SUPPORTING YOUR CONCLUSIONS. TG-P.193

CONDENSATION Use a concept map to record everything about condensation we discuss in the next two slides. Water exists in 3 states (or phases): solid, liquid, and gaseous vapor. WHEN WATER CHANGES FROM GAS TO LIQUID, IT IS CALLED CONDENSATION. TG-P.193

CONDENSATION Water vapor condenses to form condensation. The dew on the cup filled with ice or ice water is vapor that has turned into a liquid. You have witnessed that change. Are there other examples of condensation that you can think of? TG-P.193