Classify the following chemical reactions as exothermic or endothermic.

Question

A plant absorbs sun rays for photosynthesis. The plant is the system.
B. the chemicals in a cold pack are mixed together and the temperature decreases. The cold pack is the system.
C. the chemicals in a hot pack are mixed together and the temperature increases. The hot pack is the system.
D. fireworks explode. The fireworks are the system.

Answer 1

Here is the classification of the chemical reactions based on whether they are exothermic or endothermic:

A. Exothermic - Photosynthesis is a process by which plants absorb sunlight and convert carbon dioxide and water into glucose and oxygen. While it may seem counterintuitive, since it requires sunlight (an external energy source), within the context of the plant as the system, it typically operates as an energy-storing process.

B. Endothermic - The chemicals in the cold pack absorb heat from the surroundings, leading to a decrease in temperature. This indicates that energy is taken in from the environment.

C. Exothermic - The chemicals in the hot pack release heat into the surroundings, causing an increase in temperature. This indicates that energy is released into the environment.

D. Exothermic - The explosion of fireworks involves rapid chemical reactions that release a large amount of energy in the form of heat and light, indicating that energy is released into the environment.

To summarize: A. Exothermic (in an energy-storing context) B. Endothermic C. Exothermic D. Exothermic