the+laboratory+and+industrial+preparation+of+one+gas+of+significance+to+the+quality+of+the+atmosphere


 * //The laboratory and industrial preparation of one gas of significance to the quality of the atmosphere// **


 * Videos**

Nitrogen and Oxygen: Fractional Distillation of air || media type="custom" key="24193272" Laboratory preparation of nitrogen(II) oxide || media type="custom" key="24193350" Laboratory preparation of nitrogen (IV) oxide ||
 * media type="custom" key="24193116"

Laboratory preparation of oxygen gas || media type="custom" key="24194726" Fermentation of glucose to produce carbon dioxide || media type="custom" key="24194758" Laboratory preparation of carbon dioxide ||
 * media type="custom" key="24194684"


 * Common misconceptions:**
 * The temperature of a boiling substance increases as it boils.
 * The boiling point is when a liquid turns into gas, and not vice versa.
 * Nitrogen gas is very reactive.
 * Oxygen gas isn't reactive and that's why it's so useful to life on earth.
 * Less oxygen is available at high elevations.
 * Carbon dioxide supports combustion like oxygen.
 * Carbon dioxide forms basic solutions.


 * Interesting facts:**
 * The temperature of the boiling water (for example) stays at 100 degrees Celsius as it boils.
 * The boiling point is a phase change between liquid and gas. It is the point when a liquid turns into gas and a gas turns into liquid. The boiling water can be viewed as liquid turning into gas, or gas turning into liquid.
 * Nitrogen gas is relatively inert due to the presence of a triple bond.
 * Many of oxygen's uses are due to it's reactivity. This includes it's reaction with glucose in living cells to release energy.
 * The concentration of oxygen remains pretty much the same regardless of the elevation. The concentration of oxygen is about 21% at sea level and on top of Mount Everest. Therefore, shortness of breath at high elevations is not due to less oxygen - but because of air pressure.
 * Carbon dioxide is only slightly soluble in water. This makes solid carbon dioxide more convenient to use than ordinary ice in many situations, as it does not wet the items being cooled.
 * When carbon dioxide dissolves in water, most of it remains as carbon dioxide (aq), but some will react with water to form carbonic acid.


 * Resources:**
 * The Habitable Planet - The Atmosphere from Annenberg Learner.
 * Fractional Distillation from the Royal Society of Chemistry.