Question
Classify the following chemical reactions as exothermic or endothermic.
Fireworks explode. The Fireworks are the system
The 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.
A plant absorbs sun rays for photosynthesis. The plant is the system.
Fireworks explode. The Fireworks are the system
The 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.
A plant absorbs sun rays for photosynthesis. The plant is the system.
Answers
GPT-4o mini
Let's classify each of the chemical reactions based on the energy changes involved:
1. **Fireworks explode. The Fireworks are the system.**
- **Classification:** Exothermic
- **Explanation:** The explosion of fireworks releases energy in the form of heat and light to the surroundings.
2. **The chemicals in a hot pack are mixed together and the temperature increases. The hot pack is the system.**
- **Classification:** Exothermic
- **Explanation:** The increase in temperature indicates that heat is being released into the surroundings as a result of the chemical reaction in the hot pack.
3. **The chemicals in a cold pack are mixed together and the temperature decreases. The cold pack is the system.**
- **Classification:** Endothermic
- **Explanation:** The decrease in temperature indicates that heat is being absorbed from the surroundings, which is characteristic of an endothermic reaction.
4. **A plant absorbs sun rays for photosynthesis. The plant is the system.**
- **Classification:** Endothermic
- **Explanation:** Photosynthesis involves the absorption of sunlight (energy) to convert carbon dioxide and water into glucose and oxygen, making it an endothermic process.
In summary:
- Fireworks explosion: Exothermic
- Hot pack reaction: Exothermic
- Cold pack reaction: Endothermic
- Photosynthesis: Endothermic
1. **Fireworks explode. The Fireworks are the system.**
- **Classification:** Exothermic
- **Explanation:** The explosion of fireworks releases energy in the form of heat and light to the surroundings.
2. **The chemicals in a hot pack are mixed together and the temperature increases. The hot pack is the system.**
- **Classification:** Exothermic
- **Explanation:** The increase in temperature indicates that heat is being released into the surroundings as a result of the chemical reaction in the hot pack.
3. **The chemicals in a cold pack are mixed together and the temperature decreases. The cold pack is the system.**
- **Classification:** Endothermic
- **Explanation:** The decrease in temperature indicates that heat is being absorbed from the surroundings, which is characteristic of an endothermic reaction.
4. **A plant absorbs sun rays for photosynthesis. The plant is the system.**
- **Classification:** Endothermic
- **Explanation:** Photosynthesis involves the absorption of sunlight (energy) to convert carbon dioxide and water into glucose and oxygen, making it an endothermic process.
In summary:
- Fireworks explosion: Exothermic
- Hot pack reaction: Exothermic
- Cold pack reaction: Endothermic
- Photosynthesis: Endothermic