Multiple Choice
Energy is released as a result of which of the following chemical reactions?
8. Thermochemistry
Endothermic & Exothermic Reactions
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Which of the following reactions releases energy?
A
Evaporation of water
B
Melting of ice
C
Photosynthesis
D
Combustion of methane
Verified step by step guidance1
Understand that reactions can either absorb or release energy. Reactions that release energy are exothermic, while those that absorb energy are endothermic.
Evaporation of water and melting of ice are both phase changes that require energy input to overcome intermolecular forces, making them endothermic processes.
Photosynthesis is a process where plants convert carbon dioxide and water into glucose and oxygen using sunlight. This process requires energy input from sunlight, making it endothermic.
Combustion of methane is a chemical reaction where methane reacts with oxygen to produce carbon dioxide and water, releasing energy in the form of heat and light. This is an exothermic reaction.
Identify that the combustion of methane is the only reaction among the options that releases energy, making it the correct answer.
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