Multiple Choice
Which one of the following is an exothermic process?
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8. Thermochemistry
Endothermic & Exothermic Reactions
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Which of the following is an example of an endothermic process?
A
Combustion of methane
B
Condensation of water vapor
C
Neutralization of hydrochloric acid with sodium hydroxide
D
Melting of ice
Verified step by step guidance1
Understand the definition of an endothermic process: it is a process that absorbs heat from the surroundings, resulting in a positive heat flow into the system.
Analyze each option by considering whether heat is absorbed or released during the process:
- Combustion of methane is an exothermic reaction because it releases heat.
- Condensation of water vapor is exothermic since it releases heat as vapor turns into liquid.
- Neutralization of hydrochloric acid with sodium hydroxide is exothermic because it releases heat during the acid-base reaction.
- Melting of ice is endothermic because it requires heat absorption to change solid ice into liquid water.
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