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When ammonium nitrate is dissolved in water, energy is absorbed from the surroundings, causing a decrease in the resulting solution's temperature. Which of the following best describes this type of reaction?

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A reaction that absorbs energy from the solution and decreases the solution's temperature is called and endothermic reaction. A physical change that absorbs heat can also be described as endothermic.
The opposite of endothermic is exothermic. A reaction that is exothermic releases energy to the surroundings. This is observed as an increase in the temperature of the solution.
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