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 exothermic (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 to help keep food cool. Jacob and Natalie read about different substances that can be used inside cold packs and learn 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 (*©)
Final Temperature (°C)
1
Ammonium nitrate, urea, and water
22.0
-17.5
Ammonium nitrate and water
22.0
-4.0
3
Urea and water
22,0
4.0
Water
22.0
22.0
Jacob and Natalie first make a cold pack by mixing several substances in a thick, plastic bag (they call this Design 1). Jacob and Natalie decide they need to modify Design 1. They make Design 2 shown in the drawing below. The outer bag has an inner bag inside of it. The inner bag contains a substance that is released and allowed to mix with the substance in the outer bag only after being popped open by a person.
Design 2
Outer bag
Inner bag
Use the drop-down menus below to complete the statement explaining the difference between Design 1 and Design 2
Design 2 will allow the cold pack to
heat energy only when it is needed to cool food. Design 1
heat energy
from the moment it is made. This means that Design 1 will likely feel
- when it is needed than Design 2 since the timing of
the chemical reaction
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 exothermic (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 to help keep food cool. Jacob and Natalie read about different substances that can be used inside cold packs and learn 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 (*©)
Final Temperature (°C)
1
Ammonium nitrate, urea, and water
22.0
-17.5
Ammonium nitrate and water
22.0
-4.0
3
Urea and water
22,0
4.0
Water
22.0
22.0
Jacob and Natalie first make a cold pack by mixing several substances in a thick, plastic bag (they call this Design 1). Jacob and Natalie decide they need to modify Design 1. They make Design 2 shown in the drawing below. The outer bag has an inner bag inside of it. The inner bag contains a substance that is released and allowed to mix with the substance in the outer bag only after being popped open by a person.
Design 2
Outer bag
Inner bag
Use the drop-down menus below to complete the statement explaining the difference between Design 1 and Design 2
Design 2 will allow the cold pack to
heat energy only when it is needed to cool food. Design 1
heat energy
from the moment it is made. This means that Design 1 will likely feel
- when it is needed than Design 2 since the timing of
the chemical reaction
Answers
GPT-4o mini
Design 2 will allow the cold pack to absorb heat energy only when it is needed to cool food. Design 1 releases heat energy from the moment it is made. This means that Design 1 will likely feel warmer when it is needed than Design 2 since the timing of the chemical reaction is not controlled.