On Friday we did a science experiment. We put baking soda and citric acid into a tissue and put this into a plastic bag. This was to delay the reaction. Next we added water. It started to foam up and the bag puffed up. When the water was added to the baking soda and citric acid, it caused a chemical reaction that produced a gas called carbon dioxide. This chemical reaction made the bag go really cold!! Billie and Ava
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