We were learning about what an endothermic reaction is. We created one by making a cold air balloon, you can make this by using a balloon, a bottle, vinegar, a measuring cup and a tablespoon. This is how you create it: Use the funnel and add a tablespoon or two of baking soda into the balloon. Wipe any baking soda from the funnel and place it into the bottle. Pour about a half a cup of vinegar into the bottle. Fit the balloon over the opening of the bottle making sure no baking soda falls inside. Now lift the balloon and let the baking soda fall and mix with the vinegar. Observe as you Cold Air Balloon inflates then feel the bottom of the bottle, it will be cold.
What happened? When vinegar and baking soda mix, an endothermic reaction occurs. This produces carbon dioxide which inflates the balloon. The endothermic chemical reaction will also lower the temperature in the area surrounding the vinegar and baking soda so significantly that you will be able to easily notice the change in temperature.
I observed that when the baking soda and the vinegar mixed together it created carbon dioxide bubbles that raised the air pressure causing the balloon to inflate. Lowering the temperature.
Next time I will try and make the balloon explode, because this time the balloon only inflated and didn't actually blow up. I think I could make this happen by adding more baking soda and more vinegar.
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