Question

Classify the following chemical reactions as exothermic or endothermic.(4 points)Exothermic EndothermicThe chemicals in a hot pack are mixed together and the temperature increases. The hot pack is the system.The chemicals in a cold pack are mixed together and the temperature decreases. The cold pack is the system.Fireworks explode. The fireworks are the system.A plant absorbs sun rays for photosynthesis. The plant is the system.

Answer 1

Here is the classification of the chemical reactions as exothermic or endothermic:

Exothermic:

1. The chemicals in a hot pack are mixed together and the temperature increases. The hot pack is the system.
2. Fireworks explode. The fireworks are the system.

Endothermic:

1. The chemicals in a cold pack are mixed together and the temperature decreases. The cold pack is the system.
2. A plant absorbs sun rays for photosynthesis. The plant is the system.

In summary:

• Exothermic: Hot pack reaction, fireworks explosion
• Endothermic: Cold pack reaction, photosynthesis in plants