Back
to top
GCSE Chemistry
Watch this threadPage 1 of 1
Go to first unread
Skip to page:
kagawa88
Badges:
11
Rep:
?
You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#1
Air is a mixture of gases and contains various pollutants . The gases are useful and can be seperated by fractional distillation of liquid air . The table gives information about some of the gases in air
to seperate these gases :
the air is filtered
water is removed first
carbon dioixde is then removed by absorption
the gases remaining are compressed and cooled to -200°C
Water vapour and carbon dioxide are removed before the gases are compressed and cooled.Use the information in the table to suggest why.
I know the answer that at -200 degrees C they are solid and block pipes. But I do not understand why. It says the melting point of Water vapour is 0 and -78.5 for carbon dioxide so surely they are liquid. If you cooled beyond this temperature they are solid?
to seperate these gases :
the air is filtered
water is removed first
carbon dioixde is then removed by absorption
the gases remaining are compressed and cooled to -200°C
Water vapour and carbon dioxide are removed before the gases are compressed and cooled.Use the information in the table to suggest why.
I know the answer that at -200 degrees C they are solid and block pipes. But I do not understand why. It says the melting point of Water vapour is 0 and -78.5 for carbon dioxide so surely they are liquid. If you cooled beyond this temperature they are solid?
0
reply
shwansalah
Badges:
2
Rep:
?
You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#2
Report
#2
(Original post by kagawa88)
Air is a mixture of gases and contains various pollutants . The gases are useful and can be seperated by fractional distillation of liquid air . The table gives information about some of the gases in air
to seperate these gases :
the air is filtered
water is removed first
carbon dioixde is then removed by absorption
the gases remaining are compressed and cooled to -200°C
Water vapour and carbon dioxide are removed before the gases are compressed and cooled.Use the information in the table to suggest why.
I know the answer that at -200 degrees C they are solid and block pipes. But I do not understand why. It says the melting point of Water vapour is 0 and -78.5 for carbon dioxide so surely they are liquid. If you cooled beyond this temperature they are solid?
Air is a mixture of gases and contains various pollutants . The gases are useful and can be seperated by fractional distillation of liquid air . The table gives information about some of the gases in air
to seperate these gases :
the air is filtered
water is removed first
carbon dioixde is then removed by absorption
the gases remaining are compressed and cooled to -200°C
Water vapour and carbon dioxide are removed before the gases are compressed and cooled.Use the information in the table to suggest why.
I know the answer that at -200 degrees C they are solid and block pipes. But I do not understand why. It says the melting point of Water vapour is 0 and -78.5 for carbon dioxide so surely they are liquid. If you cooled beyond this temperature they are solid?
0
reply
username1530463
Badges:
6
Rep:
?
You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#3
kagawa88
Badges:
11
Rep:
?
You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#4
X
Page 1 of 1
Go to first unread
Skip to page:
Quick Reply
