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Intro—Airbags - PowerPoint PPT Presentation

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Intro—Airbags. How do airbags work in your car?. There is a Nylon bag inside your steering wheel That bag contains solid sodium azide (NaN 3 ) which is ignited with electricity when a crash sets off a trigger 2 NaN 3 (s)  2 Na (s) + 3 N 2 (g)

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Presentation Transcript
how do airbags work in your car
How do airbags work in your car?
  • There is a Nylon bag inside your steering wheel
  • That bag contains solid sodium azide (NaN3) which is ignited with electricity when a crash sets off a trigger
  • 2 NaN3 (s)  2 Na (s) + 3 N2 (g)
  • The nitrogen gas created in this reaction then fills the airbag!!

How Does An Airbag Work??? Watch this!

problems with this reaction
Problems with this reaction?
  • It produces sodium metal, which reacts with water to form hydrogen gas & it also produces enough heat to ignite the hydrogen gas
  • The reaction produces heat, so the gas is very hot inside of the airbag
  • NaN3 is very toxic

What Solutions did we see in the video???

why do we use it
Why do we use it?
  • It produces the gas very quickly, but not so quick that it’s more of a hazard
  • Reactants are small and easier to store before needed
  • The amount of dangerous chemical is minimal
  • Heat from the reaction is absorbed, in part, by the physical components of the airbag system (nylon bag, steering wheel etc.)
  • Particles are closely packed together
  • Particles vibrate in place – in fixed positions
  • Particles can’t switch places
  • Have a definite shape
  • Have a definite volume
  • Particles more spread out than solid
  • Particles are free to move past each other – fluid
  • Slightly compressible
  • Definite volume
  • No definite shape – take shape of container
  • Particles very spread out – they can be poured
  • Rapid, random motion
  • Highly compressible
  • No definite volume—they will fill container
  • No definite shape—take shape of container
changes in state


Boiling or



Increasing molecular motion (temperature)







Changes in State
temperature of state changes
Temperature of state changes
  • Freezing point = melting pint
  • Boiling point = condensation point

Example: Water will freeze or melt at 0°C – it just depends upon the direction of heat flow. If we are adding heat at 0°C then it will melt. If we take away heat at 0°C it will freeze! 

what s between the particles
What’s between the particles?


Nothing! There is absolutely nothing between the particles!