Scelta multipla
Which of the following is an example of an exothermic reaction?
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8. Thermochemistry
Endothermic & Exothermic Reactions
Scelta multipla
Which of the following is typical of an endothermic reaction?
A
The enthalpy change (ΔH) is negative.
B
The reaction absorbs heat from its surroundings.
C
Energy is released in the form of heat.
D
The temperature of the surroundings increases.
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Understand the definition of an endothermic reaction: it is a chemical reaction that absorbs heat from its surroundings during the process.
Recall that enthalpy change (\$\(\Delta\) H\$) represents the heat absorbed or released at constant pressure. For endothermic reactions, \$\(\Delta\) H\$ is positive because the system gains heat.
Recognize that if a reaction absorbs heat, the surroundings lose heat, which typically causes the temperature of the surroundings to decrease, not increase.
Contrast this with exothermic reactions, where \$\(\Delta\) H\$ is negative, heat is released, and the temperature of the surroundings increases.
Therefore, the typical characteristic of an endothermic reaction is that it absorbs heat from its surroundings, corresponding to a positive enthalpy change.
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