can someone please answer the above question?
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plz send a clear pic
badgirl86:
sry but i crop it from my test paper. but here is the question:-
ok
a. why solid cardon dioxide is called dry ice?give its uses
b.why is dry ice stored under high pressure?
c. why is dry ice stored under high presure?
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Solid carbon dioxide is known as dry ice.
Because it looks like ice and because when it “melts” (it actually sublimes) it goes from solid straight to gas, no liquid, hence dry ice.
uses are...
1. To pack in "coolers" with food, or other products which require being kept frozen.
2. To place in deep freezers or refrigerators during times when electricalpower is off.
3. To add to party punch bowls to provide a bubbling, heavier than air "fog" creating "spooky" visual effects.
Dry ice" is actually solid carbon dioxide and is at a temperature of -80deg C compared to ice at 0deg C. So its better because its colder but also ice when it melts forms puddles of water dry ice forms carbon dioxide gas which is much less messy.
Solid carbon dioxide is stored under high pressure.
This is because on decreasing the pressure on solid carbon dioxide , it gets converted directly into carbon dioxide gas.
For example :
When a slab of Dry ice is kept in open air, then the pressure on it is reduced to normal atmospheric pressure[1 atmp] , its temperature rises and it starts changing into CO2 gas.
Because it looks like ice and because when it “melts” (it actually sublimes) it goes from solid straight to gas, no liquid, hence dry ice.
uses are...
1. To pack in "coolers" with food, or other products which require being kept frozen.
2. To place in deep freezers or refrigerators during times when electricalpower is off.
3. To add to party punch bowls to provide a bubbling, heavier than air "fog" creating "spooky" visual effects.
Dry ice" is actually solid carbon dioxide and is at a temperature of -80deg C compared to ice at 0deg C. So its better because its colder but also ice when it melts forms puddles of water dry ice forms carbon dioxide gas which is much less messy.
Solid carbon dioxide is stored under high pressure.
This is because on decreasing the pressure on solid carbon dioxide , it gets converted directly into carbon dioxide gas.
For example :
When a slab of Dry ice is kept in open air, then the pressure on it is reduced to normal atmospheric pressure[1 atmp] , its temperature rises and it starts changing into CO2 gas.
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