Question
Cold Pack Investigation
Cold Pack Investigation
People use self-warming and self-cooling devices for many purposes such as keeping drinks cold or food warm. Medical professionals also use these types of devices to store medicines and other substances that need to stay colder than room temperature. These cooling and warming devices use a chemical reaction to produce their chilling and warming effects. Compounds combine in endothermic (heat absorbing) or exothermi (heat releasing) reactions within these devices to help them keep items cool or warm.
Jacob and Natalie are asked by their science teacher to design a warming or cooling device. They decide to design a cold pack that can be used help keep food cool. Jacob and Natalie read about different substances that can be used inside cold packs and leam that most cold packs use endothermic reactions to cool objects. They find the table below while researching.
Effect on Temperature of Different Substances
Sample
Composition
Initial Temperature (°C)
Final Temperature (*C)
Ammonium nitrate, urea, and water
22.0
-17.5
2
Ammonium nitrate and water
22.0
-4,0
Urea and water
22.0
4.0
4
Water
22,0
22.0
Which sample uses the substance(s) that Jacob and Natalie should use to make a cold pack that will do the BEST job of keeping food cool?
A. Sample 1, because it absorbs the most energy
B. Sample 2 because it absorbs the most energy
ised to se
C. Sample 3, because it absorbs the least energy
D. Sample 4, because it absorbs the least energy
Cold Pack Investigation
People use self-warming and self-cooling devices for many purposes such as keeping drinks cold or food warm. Medical professionals also use these types of devices to store medicines and other substances that need to stay colder than room temperature. These cooling and warming devices use a chemical reaction to produce their chilling and warming effects. Compounds combine in endothermic (heat absorbing) or exothermi (heat releasing) reactions within these devices to help them keep items cool or warm.
Jacob and Natalie are asked by their science teacher to design a warming or cooling device. They decide to design a cold pack that can be used help keep food cool. Jacob and Natalie read about different substances that can be used inside cold packs and leam that most cold packs use endothermic reactions to cool objects. They find the table below while researching.
Effect on Temperature of Different Substances
Sample
Composition
Initial Temperature (°C)
Final Temperature (*C)
Ammonium nitrate, urea, and water
22.0
-17.5
2
Ammonium nitrate and water
22.0
-4,0
Urea and water
22.0
4.0
4
Water
22,0
22.0
Which sample uses the substance(s) that Jacob and Natalie should use to make a cold pack that will do the BEST job of keeping food cool?
A. Sample 1, because it absorbs the most energy
B. Sample 2 because it absorbs the most energy
ised to se
C. Sample 3, because it absorbs the least energy
D. Sample 4, because it absorbs the least energy
Answers
GPT-4o mini
To determine which sample would be best for Jacob and Natalie to use in their cold pack, we need to analyze the temperature changes of each sample. The goal of a cold pack is to create a significant drop in temperature, indicating that an endothermic reaction has taken place and the pack is absorbing heat from its surroundings effectively.
### Analysis of Samples:
1. **Sample 1**:
- Composition: Ammonium nitrate, urea, and water
- Initial Temperature: 22.0°C
- Final Temperature: -17.5°C
- Temperature Change: \( -17.5 - 22.0 = -39.5°C \)
2. **Sample 2**:
- Composition: Ammonium nitrate and water
- Initial Temperature: 22.0°C
- Final Temperature: -4.0°C
- Temperature Change: \( -4.0 - 22.0 = -26.0°C \)
3. **Sample 3**:
- Composition: Urea and water
- Initial Temperature: 22.0°C
- Final Temperature: 4.0°C
- Temperature Change: \( 4.0 - 22.0 = -18.0°C \)
4. **Sample 4**:
- Composition: Water
- Initial Temperature: 22.0°C
- Final Temperature: 22.0°C
- Temperature Change: \( 22.0 - 22.0 = 0°C \)
### Conclusion:
Sample 1 has the largest temperature drop of -39.5°C, which indicates that it absorbs the most heat energy from its surroundings. Therefore, the best choice for Jacob and Natalie’s cold pack would be:
**A. Sample 1, because it absorbs the most energy.**
### Analysis of Samples:
1. **Sample 1**:
- Composition: Ammonium nitrate, urea, and water
- Initial Temperature: 22.0°C
- Final Temperature: -17.5°C
- Temperature Change: \( -17.5 - 22.0 = -39.5°C \)
2. **Sample 2**:
- Composition: Ammonium nitrate and water
- Initial Temperature: 22.0°C
- Final Temperature: -4.0°C
- Temperature Change: \( -4.0 - 22.0 = -26.0°C \)
3. **Sample 3**:
- Composition: Urea and water
- Initial Temperature: 22.0°C
- Final Temperature: 4.0°C
- Temperature Change: \( 4.0 - 22.0 = -18.0°C \)
4. **Sample 4**:
- Composition: Water
- Initial Temperature: 22.0°C
- Final Temperature: 22.0°C
- Temperature Change: \( 22.0 - 22.0 = 0°C \)
### Conclusion:
Sample 1 has the largest temperature drop of -39.5°C, which indicates that it absorbs the most heat energy from its surroundings. Therefore, the best choice for Jacob and Natalie’s cold pack would be:
**A. Sample 1, because it absorbs the most energy.**