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When mixing sodium hydroxide pellets with water to form an aqueous solution, you notice the flask getting very hot.

Which of the following statements BEST describes the thermodynamic reaction?

A

Endothermic. The energy is flowing from the system ($NaOH$ in water) to the surroundings.

B

Endothermic. The energy is flowing from the surroundings ($NaOH$ in water) to the system.

C

Exothermic. The energy is flowing from the system ($NaOH$ in water) to the surroundings.

D

Exothermic. The energy is flowing from the surroundings ($NaOH$ in water) to the system.

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