Cloze Activity

Read the paragraph on the steps involved in fractional distallation below and fill in the missing words.

FRACTIONAL DISTILLATION OF LIQUID AIR

Air is a mixture of nitrogen, Cloze (1): , carbon (IV) oxide, noble gases and water vapour. These gases can be obtained by Cloze (2): of liquid air.

Air is puified by passing it through Cloze (3):

Carbon (IV) Oxide gas is removed by passing the air through Concentrated Cloze (4): solution

The remaining air is condensed to about -25 degree centrigrades to remove Cloze (5): which solidifies out as ice

The air is compressed to about Cloze (6): JXUwMDZhJXUwMDAyJXUwMDAw atmospheres. The cooled compressed air is allowed to expand rapidly. This process is repeated until all the air liquidifies

The liquified air is then passed into the Cloze (7): containing compartments

Each compartment is slightly at a higher temperature than the one above it. The components of the liquid air then separated according to their Cloze (8):

Cloze (9): distills off first because it has a lower boiling point of -196 degrees centrigrade followed by Cloze (10): at -186 degree centrigrade and finally Cloze (11): at -183 degree centigrade.

Liquid Oxygen is transported in large insulated metal tanks.

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