Janice VanCleave’s Crazy, Kooky, and Quirky Chemistry Experiments

Janice VanCleave’s Crazy, Kooky, and Quirky Chemistry Experiments — page 7
Foamy Purpose To show how pressure affects dissolved gases Materials plastic cereal bowl 16-ounce 480 ml glass soda bottle ¼ cup 63 ml tap water two effervescent antacid tablets Procedure 1 Set the bowl on a table and stand the soda bottle in it 2 Pour the water into the bottle 3 Break the antacid tablets in half 4 Quickly drop the broken tablets into the bottle of water and immediately cover the mouth of the bottle with the palm of your hand 5 Observe the contents of the bottle 6 When it becomes difficult for you to keep your hand over the bottle because of the pressure against your palm quickly lift your hand and observe what happens to the bottle’s contents Results The antacid tablets mix with the water producing bubbles When the bottle is covered bubbles are seen in the water and a small amount of foam forms on the surface of the water Uncovering the bottle produces a bubbly foam that rises within the bottle Why When the antacid tablets are combined with water carbon dioxide gas is produced Covering the opening of the bottle prevents the 10 Janice VanCleave’s Crazy Kooky and Quirky Chemistry Experiments