Multiple Choice
In an endothermic chemical reaction, from where does the system obtain the heat energy required for the reaction to occur?
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8. Thermochemistry
Endothermic & Exothermic Reactions
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Which of the following changes is an endothermic chemical reaction?
A
Photosynthesis in plants
B
Neutralization of hydrochloric acid with sodium hydroxide
C
Freezing of water
D
Combustion of methane
Verified step by step guidance1
Understand the definition of an endothermic reaction: it is a process that absorbs heat from the surroundings, meaning energy is taken in during the reaction.
Analyze each option to determine whether it absorbs or releases heat:
Photosynthesis in plants requires energy input from sunlight to convert carbon dioxide and water into glucose and oxygen, so it absorbs energy and is endothermic.
Neutralization of hydrochloric acid with sodium hydroxide releases heat, making it an exothermic reaction.
Freezing of water releases heat to the surroundings as water changes from liquid to solid, so it is exothermic.
Combustion of methane releases energy in the form of heat and light, so it is also exothermic.
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