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A student mixes two chemicals in a test tube. She notices that the mixture starts to bubble and the test
tube feels very warm. The student most likely concludes that the mixture is-
F. a chemical reaction that happened too quickly.
G. an endothermic reaction that absorbed thermal energy.
H. an exothermic reaction that released thermal energy.
J. not a chemical reaction.

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quasarJose

Answer:

H. an exothermic reaction that released thermal energy.

Explanation:

The student will most conclude that this is a chemical reaction in which thermal energy is released to the environment.

Such reactions accompanied by the release of thermal energy are exothermic reactions.

  • In an exothermic change, heat is liberated to the surrounding.
  • The surrounding becomes hotter at the end of the changes.
  • For such reaction we say that enthalpy change is negative.

For endothermic reactions, heat is absorbed. At the end of the reaction, the system is cold.

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