Carbon dioxide (a gas at normal temperature and pressure) is dissolved in water. Show the class a bottle of carbonated mineral water or soda. Gas occupies a greater volume than liquid or solid, so pressure increased within the canister until the lid could no longer contain it. Gas was released when the Alka-seltzer came into contact with water. Alka-seltzer ooze may overflow the container just as lava might move down the slopes of a volcano.Īsk the students what happened. In a few seconds the increasing pressure within the canister will cause it to "erupt", blowing the cap and the empty canister into the air getting everyone's attention. You might do this surreptitiously and begin talking about gases, liquids, and solids. Drop an Alka-seltzer into the canister and put the lid on and place a second, empty canister on top of the first. Fill a film canister 1/4 to 1/3 full of water. Procedure Part 1: Demonstrate Gas PressureĪs an attention grabber and to introduce volcanism and the effects of gas and pressure, prepare the following experiment.
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