chapter 7-Air

Air has mass and ..................

• occupies space 
• do not occupies space 

How much is the percentage of Nitrogen in air? 

• 0.03 %
• 78 % 
• 21 %
• trace

How much is the percentage of CO₂ in air ? 

• 21
• 0.03

Does air contains water vapour ?

• Yes 
• No

Is air a mixture or compound ?

• mixture 
• compound

what is the suitable method to separate air components ? 

• chromatography 
• Fractional distillation 
• using magnet 

- Respiration 
-Combustion of rocket engine 
-Welding and steel cutting 
are examples of importance of ........

• inert gas 
• nitrogen 
• carbon dioxide 
• oxygen 

- photosynthesis
- production of carbonated drinks 
-Fire extinguisher 
-carbon cycle 
are examples of importance of ... 

• inert gas 
• nitrogen 
• carbon dioxide 
• oxygen 

-production of Nitric Acid and ammonia 
-Nitrogen Cycle 
-Liquid nitrogen as cooling agent 
are examples of importance of ...

• inert gas 
• nitrogen 
• carbon dioxide 
• oxygen 

-hot balloons and weather ballons 
-Advertising lights 
-lights bulbs 
uses.........

• inert gas 
• nitrogen 
• carbon dioxide 
• oxygen