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airspace Discussion Points: 1. Why did the splint extinguish when placed in the bag? For a fire to exist, three things are required: (1) Fuel, which in this scenario was the carbon molecules of the wooden splint, (2) heat, produced by the glowing embers, and (3) oxygen. The bag contained almost no oxygen, which forced the fire to extinguish immediately. 2. What was the difference between the carbon dioxide in the bag and the air outside? The carbon dioxide in the bag was almost 100% pure, whereas the level of carbon dioxide in the air is less than 1%. This low level of CO2 is not enough to prevent the oxygen in the air from permitting a fire to burn in Earth’s normal atmosphere. 3. Why did the bag become cool to the touch? Almost every time there is a chemical reaction, there is also a transfer of heat either to or from the substance. In this case, the chemical reaction was endothermic, meaning that it absorbed heat, which cooled the carbon dioxide gas being produced. 4. Can you name a device that uses carbon dioxide with similar effect? Fire extinguishers (specifically the black-colored ones) use a chemical reaction to produce large quantities of carbon dioxide. When dispensed, it smothers the fire, preventing oxygen from being able to reach it. As such, the fire goes out. This is used primarily on electrical fires where a water-based extinguisher would be dangerous. 14 MUSEUM IN A BOXPDF Image | Making Oxygen and Carbon Dioxide NASA
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