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Questions and Answers
What is the desired temperature range the heat pack needs to reach after activation?
What is the desired temperature range the heat pack needs to reach after activation?
- 25 to 40°C
- 35 to 55°C (correct)
- 45 to 60°C
- 15 to 35°C
Which substance resulted in the highest final temperature increase when added to water?
Which substance resulted in the highest final temperature increase when added to water?
- Ammonium nitrate
- Calcium chloride (16g) (correct)
- Sodium hydroxide
- Calcium chloride (4g)
How much water is involved in the experiments with the substances?
How much water is involved in the experiments with the substances?
- 100 grams (correct)
- 150 grams
- 200 grams
- 50 grams
What is a key requirement for the heat pack design to ensure the separation of water and the substance until activation?
What is a key requirement for the heat pack design to ensure the separation of water and the substance until activation?
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What did researchers identify as a critical factor in the design of the heat pack?
What did researchers identify as a critical factor in the design of the heat pack?
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Why is it important for researchers to identify substances that can release or absorb heat for the heat pack design?
Why is it important for researchers to identify substances that can release or absorb heat for the heat pack design?
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