Exercise
Form 10: Cold Packs and Hot Packs
In this engaging exercise, students will explore the principles of heat transfer by creating their own cold packs and hot packs using everyday materials, while investigating the science behind temperature changes and their effects on the human body. This hands-on activity encourages critical thinking as students analyze the effectiveness of their packs in various scenarios, fostering a deeper understanding of thermal energy.
Questions
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MultiChoice
What type of chemical process is used in medical instant cold packs?
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MultiChoice
What type of chemical process is used in disposable pocket hand warmers?
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MultiChoice
Inside an instant cold pack, ammonium nitrate dissolves in water. This process:
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MultiChoice
Inside a hand warmer, iron powder reacts with oxygen in air. This process:
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MultiChoice
When an instant cold pack is activated, how does it feel against human skin?
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MultiChoice
When a hand warmer pack is exposed to air, how does it feel?
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MultiChoice
Which pack absorbs thermal energy directly from a swollen ankle?
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MultiChoice
Why is an instant cold pack effective for reducing swelling in injuries?
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MultiChoice
A hand warmer relies on the oxidation of iron. Oxidation of iron metal is generally:
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MultiChoice
If a pack temperature drops from 22°C to 4°C upon mixing, it is a:
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MultiChoice
Reusable gel packs release heat when sodium acetate crystallizes. Crystallization here is an:
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MultiChoice
What happens to the surrounding temperature when a heat pack is activated?