Multiple Choice
In which of the following scenarios is chemical energy being transformed into thermal energy?
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8. Thermochemistry
Endothermic & Exothermic Reactions
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Which of the following reactions requires an input of energy to occur?
A
Exothermic reaction
B
Combustion reaction
C
Neutralization reaction
D
Endothermic reaction
Verified step by step guidance1
Understand the concept of endothermic and exothermic reactions. Endothermic reactions absorb energy from the surroundings, while exothermic reactions release energy.
Identify the characteristics of each type of reaction listed. Combustion and neutralization reactions are typically exothermic, meaning they release energy.
Recognize that an endothermic reaction requires an input of energy to proceed. This is because the energy absorbed is used to break bonds in the reactants.
Consider the energy profile of an endothermic reaction. The energy of the products is higher than the energy of the reactants, indicating that energy is absorbed.
Conclude that among the options given, the endothermic reaction is the one that requires an input of energy to occur.
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