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In an exothermic reaction, what happens to the energy released during the reaction?
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8. Thermochemistry
Endothermic & Exothermic Reactions
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Which of the following happens during an endothermic chemical change?
A
The reaction vessel feels warm to the touch.
B
Heat is released to the surroundings.
C
The temperature of the surroundings increases.
D
Heat is absorbed from the surroundings.
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Understand the definition of an endothermic process: it is a chemical change that absorbs heat from the surroundings.
Recall that when heat is absorbed, the system takes in energy, causing the surroundings to lose heat and often feel cooler.
Analyze the options: if heat is absorbed, the reaction vessel would not feel warm; instead, it might feel cooler because heat is taken in.
Recognize that heat being released to the surroundings and an increase in the surroundings' temperature are characteristics of exothermic reactions, not endothermic ones.
Conclude that during an endothermic chemical change, heat is absorbed from the surroundings, which aligns with the correct answer.
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