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When ammonium nitrate is dissolved in water in a glass container, the glass container becomes cold. Is this an endothermic or exothermic reaction? How do you know?
A. It is endothermic; heat energy has been removed from the surroundings, making the container cold.
B. It is endothermic; heat energy has been released to the surroundings, leaving the container cold.
C. It is exothermic; heat energy has been released to the surroundings, leaving the container cold.
D. It is exothermic; heat energy has been removed from the surroundings, making the container cold.
Figure 6. An instant cold pack consists of a bag containing solid ammonium nitrate and a second bag of water. When the bag of water is broken, the pack becomes cold because the dissolution of ammonium nitrate is an endothermic process that removes thermal energy from the water.
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