VTCAP Science Grade 11 Practice Questions - Vermont Comprehensive Assessment Program Science - Grade 11 Exam

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During a lab investigation, a student combines hydrochloric acid (HCl) and sodium hydroxide (NaOH) in a closed, insulated calorimeter. The temperature of the liquid increases. Which statement correctly characterizes this reaction?

It is an endothermic reaction because thermal energy is absorbed from the surroundings. It is an exothermic reaction because chemical energy is transformed into thermal energy released to the surroundings. It violates the law of conservation of energy because heat is created. It is a physical change because no new chemical bonds are formed or broken.

Correct Answer:

It is an exothermic reaction because chemical energy is transformed into thermal energy released to the surroundings.

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