객관식
Which type of chemical reaction absorbs heat energy from its surroundings?
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8. Thermochemistry
Endothermic & Exothermic Reactions
객관식
Which of the following processes is exothermic?
A
Evaporation of water
B
Photosynthesis in plants
C
Combustion of methane
D
Melting of ice
검증된 단계별 안내1
Understand the definition of an exothermic process: it is a process that releases heat to the surroundings, meaning the system loses energy.
Analyze each given process to determine if it releases or absorbs heat:
1. Evaporation of water: this is a phase change from liquid to gas, which requires energy input to overcome intermolecular forces, so it is endothermic (absorbs heat).
2. Photosynthesis in plants: this process converts carbon dioxide and water into glucose and oxygen using sunlight energy, so it requires energy input and is endothermic.
3. Combustion of methane: this is a chemical reaction where methane reacts with oxygen to produce carbon dioxide and water, releasing energy in the form of heat and light, so it is exothermic.
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