Multiple Choice
Which of the following best describes how energy is used in chemical reactions?
8. Thermochemistry
Endothermic & Exothermic Reactions
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Energy is released as a result of which of the following chemical reactions?
A
Combustion of methane
B
Photosynthesis
C
Electrolysis of water
D
Melting of ice
Verified step by step guidance1
Identify the type of reaction for each option: Combustion of methane, Photosynthesis, Electrolysis of water, and Melting of ice.
Understand that combustion reactions are exothermic, meaning they release energy. Combustion of methane is a typical example where methane reacts with oxygen to produce carbon dioxide, water, and energy.
Recognize that photosynthesis is an endothermic process where plants absorb energy from sunlight to convert carbon dioxide and water into glucose and oxygen.
Note that electrolysis of water is an endothermic process where electrical energy is used to split water into hydrogen and oxygen gases.
Understand that melting of ice is an endothermic process where energy is absorbed to change ice from a solid to a liquid state.
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