Which of the following reactions is characterized by an absorption of heat?

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Multiple Choice

Which of the following reactions is characterized by an absorption of heat?

The reaction characterized by an absorption of heat is photosynthesis in plants. During photosynthesis, plants convert carbon dioxide and water into glucose and oxygen using sunlight as the energy source. This process requires energy input, which is absorbed from sunlight, making it endothermic. In contrast, burning wood is an exothermic reaction where heat is released. The formation of ice from water is also exothermic because it releases heat to the surroundings as water molecules lose energy and transition to a solid state. Similarly, rusting of iron is a slow exothermic reaction, resulting in heat being released as iron oxidizes. Therefore, photosynthesis is the only option that explicitly requires and absorbs heat from its surroundings.

The reaction characterized by an absorption of heat is photosynthesis in plants. During photosynthesis, plants convert carbon dioxide and water into glucose and oxygen using sunlight as the energy source. This process requires energy input, which is absorbed from sunlight, making it endothermic.

In contrast, burning wood is an exothermic reaction where heat is released. The formation of ice from water is also exothermic because it releases heat to the surroundings as water molecules lose energy and transition to a solid state. Similarly, rusting of iron is a slow exothermic reaction, resulting in heat being released as iron oxidizes. Therefore, photosynthesis is the only option that explicitly requires and absorbs heat from its surroundings.

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