water measuring cup zipper-lock plastic sandwich bags paper towel tablespoon baking soda vinegar

Figure out where you want to explodeyour Bubble Bomb. Sometimes the bags make a mess when they pop, so you maywant to experiment outside. If it"s a rainy day, you can explode your BubbleBombs in the bathtub or sink. It"s very important to use a bag without holes. Totest the zipper-lock bag, put about half a cup of water into it. Zip itclosed and turn it upside down. If no water leaks out, you can use thatbag. Unzip it and pour out the water. If the bag leaks, try another one.Keep testing bags until you find one that doesn"t leak. Tear a paper towel intoa square that measures about 5 inches by 5 inches. Put 1 1/2 tablespoonsof baking soda in the center of the square, then fold the square as shownin the picture, with the baking soda inside. This is your "time-releasepacket." Pour into yourplastic bag:1/2 cup of vinegar1/4 cup of warm water Now here"s the tricky part.You need to drop the time-release packet into the vinegar and zip the bagclosed before the fizzing gets out of control.You can zip the bag halfway closed, then stuff the packetin and zip the bag closed the rest of the way in a hurry. Or you can putthe time-release packet into the mouth of the bag and hold it up out ofthe vinegar by pinching the sides of the bag. Zip the bag closed and thenlet the packet drop into the vinegar.One way or another, get the packet in the vinegar and zipthe bag closed.Shake the bag a little, put itin the sink or on the ground, and stand back! The bag will puff up dramaticallyand pop with a bang.Why does the Bubble Bomb explode?The bubbles in the Bubble Bomb are filled with carbon dioxide, a gasthat forms when the vinegar (an acid) reacts with the baking soda (a base).If you"ve ever made a cake or baked a loaf of quick bread (the kind thatdoesn"t use yeast), you"ve already done some experimenting with the bubblesthat come from an acid-base reaction. Most cakes and quick breads rise becauseof bubbles in their batter. Those bubbles, like the ones in your BubbleBomb, are created by the chemical reaction of an acid and a base.Take a look at a recipe for quick bread. If the recipe includes bakingsoda but no baking powder, it will probably also include an ingredient that"sacidic-such as buttermilk, sour milk, or orange juice.Quick-bread recipes may call for baking powder in addition to or insteadof baking soda. Baking powder is made by combining baking soda with an acidicingredient, such as tartaric acid or calcium acid phosphate. When you addwater to baking powder, it will fizz as the acid and base interact. In fact,if you ever run out of baking powder, you can make your own by mixing twoteaspoons cream of tartar (it provides the acid), one teaspoon of bakingsoda (it"s the base), and a half-teaspoon of salt. Try using a different size of zipper-lock plastic bag. What do you think might happen? Do you think you"ll need to use more baking soda, vinegar, and water to make the bag explode? Try it and see. In the original experiment, we asked you to use warm water. Try using cold water or hot water. Does changing the temperature change your results? How? The first time you tried this, you mixed the vinegar with water. Try doing the experiment again with just vinegar. How did this change your experiment? Instead of using paper towel, make your "time release packet" using a different kind of paper, like toilet paper, tissue paper or notebook paper. What happened?Any baked goods that rise rely on carbon dioxide bubbles to get the jobdone. You can make these bubbles either by using yeast or by using the acid-basereaction like you did in the experiment.Yeast is a one-celled fungus which converts sugar to carbon dioxide gas.Because this process takes a while, bakers use yeast in doughs that theyleave alone for several hours.Another method that cooks use to make something rise is a combinationof baking soda and an acidic ingredient, like orange juice or buttermilk.This is the same kind of chemical reaction that took place in your bubblebomb.Next time someone you know is baking, check the recipe to see if youcan figure out what ingredients make the bubbles that make the cake or breador cookies rise.


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