Which process is endothermic?

Which process is endothermic?

• A. Photosynthesis.
• B. Combustion.
• C. Freezing of water.
• D. Condensation of water vapor.

Answer: (A)

Endothermic processes absorb energy from their surroundings. In photosynthesis, plants capture light energy and use it to drive the chemical reactions that convert carbon dioxide and water into glucose, storing energy in the chemical bonds. That input of energy from sunlight makes this process endothermic. The other options release energy: combustion releases heat and light, freezing releases heat to the surroundings as a liquid becomes a solid, and condensation releases latent heat as water vapor becomes liquid.

Endothermic processes absorb energy from their surroundings. In photosynthesis, plants capture light energy and use it to drive the chemical reactions that convert carbon dioxide and water into glucose, storing energy in the chemical bonds. That input of energy from sunlight makes this process endothermic. The other options release energy: combustion releases heat and light, freezing releases heat to the surroundings as a liquid becomes a solid, and condensation releases latent heat as water vapor becomes liquid.