When you mix chemicals together and they
react, it is known as a spontaneous
reaction. Most spontaneous reactions give off
heat, called exothermic reactions, but some
reactions absorb heat, called endothermic
reactions. When you mix baking soda and
vinegar together, the atoms in the baking soda and
vinegar need to rearrange to form the final
products: carbon dioxide, water, and dissolved
sodium acetate. In the case of this reaction,
the rearranging takes energy, which is
absorbed from the environment. As energy is
absorbed, the solution becomes cold.
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