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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.)
solids
Solids:
  • 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
liquid
Liquid
  • 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
slide8
Gas
  • 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

Sublimation

Boiling or

Evaporating

Gas

Increasing molecular motion (temperature)

Liquid

Melting

Condensing

Freezing

Solid

Deposition

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!