Air Flashcards
What percentage of air is nitrogen
78%
What elements are in air
Nitrogen
Oxygen
Carbon dioxide
Water vapour+Argon
What percentage of air is oxygen
21%
What percentage of air is carbon dioxide
0.04%
What percentage of air is water vapour/ argon
1%
How do we separate air
Fractional distillation of liquid air
What temperature does the air go into the distillation column
-200 degrees
What temperature does nitrogen come out and in what state in fract
-190
GAS
What temperature does oxygen come out and in what state in Fractional distillation of liquid air -185
-185
LIQUID
Why can we separate air in Fractional distillation of liquid air
Nitrogen and oxygen turn to gas different tempretures
What must be present in order for iron to rust
Oxygen and water
What is rust a nickname for
Iron oxide
IRON IS THE ONLY METAL THAT RUSTS
What is sacrificial protection
When zinc is ‘sacrificed’ for iron as it’s more reactive, the oxygen and water will go to it as it gives electrons away more easily
What is galvanising
When iron is coat with zinc
Why is liquid nitrogen useful
Very cold
Little or no ability to react
