a) CO2 is a gas. Write its two gaseous properties to justify it. b) How can we liquefy a gas? c) Solid CO2 is also known as dry ice. Why?
Answers
Answer:
- it is in oxidized form
- mostly found in the top of the atmosphere
- by reducing the pressure of the atmosphere
- because it is in solid state
Answer:
a)
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b)
the gas at temperatures less than its critical temperature; (2) by making the gas do some kind of work against an external force, which causes the gas to lose energy and change to the liquid state; and (3) by making gas do work against its own internal forces, also causing it to lose energy and liquefy.
In the first approach, the application of pressure alone is sufficient to cause a gas to change to a liquid. For example, ammonia has a critical temperature of 406K (271.4°F [133°C]). This temperature is well above room temperature, so it is relatively simple to convert ammonia gas to the liquid state simply by applying sufficient pressure. At its critical temperature, that pressure is 112.5 atmospheres, although the cooler the gas is to begin with, the less pressure is needed to make it condense.
c)
What Is Dry Ice?
Dry Ice is the common name for solid carbon dioxide (CO2). It gets this name because it does not melt into a liquid when heated; instead, it changes directly into a gas (a process known as sublimation). As Ireland’s premier dry ice specialist, Polar Ice provides dry ice solutions for a diverse range of customers, in areas such as:
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