Difference between revisions of "Carbon dioxide"
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| − | '''Carbon dioxide''' | + | '''Carbon dioxide''' is exhaled when you breathe out. |
| − | + | It is used by plants in the process of [[photosynthesis]] to generate [[oxygen]]. | |
| − | + | At room temperature, it is a gas. It becomes solid at extremely cold temperatures, forming [[dry ice]]. When it thaws, it turns directly into a gas again (see [[sublimation]]). <ref>"Dry ice is frozen carbon dioxide. A block of dry ice has a surface temperature of -109.3 degrees Fahrenheit (-78.5 degrees C). Dry ice also has the very nice feature of sublimation -- as it breaks down, it turns directly into carbon dioxide gas rather than a liquid." [http://www.howstuffworks.com/question264.htm How Stuff Works] </ref> | |
| − | It | ||
Each molecule of carbon dioxide has one carbon atom and two oxygen atoms, so its chemical formula is CO<sub>2</sub>. | Each molecule of carbon dioxide has one carbon atom and two oxygen atoms, so its chemical formula is CO<sub>2</sub>. | ||
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[[Category: Gasses]] | [[Category: Gasses]] | ||
Revision as of 19:33, April 6, 2007
Carbon dioxide is exhaled when you breathe out. It is used by plants in the process of photosynthesis to generate oxygen.
At room temperature, it is a gas. It becomes solid at extremely cold temperatures, forming dry ice. When it thaws, it turns directly into a gas again (see sublimation). [1]
Each molecule of carbon dioxide has one carbon atom and two oxygen atoms, so its chemical formula is CO2.
- ↑ "Dry ice is frozen carbon dioxide. A block of dry ice has a surface temperature of -109.3 degrees Fahrenheit (-78.5 degrees C). Dry ice also has the very nice feature of sublimation -- as it breaks down, it turns directly into carbon dioxide gas rather than a liquid." How Stuff Works