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Sizzling Sunset PDF

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Calcium chloride is added to water in a plastic bag. As the chemical splits apart, it releases a noticeable amount of heat.  An acid-base indicator, phenol red, is then added to the baggie along with sodium bicarbonate (regular, old baking soda) and zipped closed. As the two chemicals react with one another, a large amount of carbon dioxide gas is released, the indicator changes color from red to yellow, and, if you are lucky, the bag will explode.  It is the perfect post-mexican dinner reaction: you get very hot, generate a lot of gas, and something has to give.  Grades 4-8

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