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Chemistry PS1 6 Equilibrium

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Project Zero THINKING ROUTINES--see below

Phenomenon--

START by saying how important you think equilibrium is in your life

THEN view the Ammonia equilibrium Clickview

Then add to your statement; how important equilibrium is in your life

Prior Knowledge/Preview
Introduction to equilibrium
Many reactions only appear to go in one direction: Reactants to products
If you change the conditions, a reaction might be reversed - some reactions are VERY hard to reverse.

A significant portion of reactions "go both ways" - and so when reactants are put together the products forms, but some of the products can reform as the original reactants

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Equilibrium

  Reactions that go both ways

  Le Chatelier's Principle

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HS-PS1-6 Matter and its Interactions
Refine the design of a chemical system by specifying a change in conditions that would produce increased amounts of products at equilibrium.

Investigating Le Chatelier's principle

Design involving changing position of equilibrium
Performance Expectation
  Grade:  High School (9-12)

Aerospace CONNECTIONS:
Applications and examples
TITAN II rocket and Gemini capsule fuel: N2O4 WIS
Discover the chemistry of N2O4 WIS

CaO + H2O --> Ca(OH)2 not considered reversible – but researched reversible thermal energy storage from the reaction for a lunar base NASA NTRS 
Chemistry in the Sunlight – ozone formation (O2 + O3 reversible reaction) NASA Earth Observatory
A reversible reaction captures carbon (CO2 in molten potassium hydroxide, KOH Lawrence Livermore Laboratory Science and Technology Review

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Inquiry science
Investigating SMOG Washington International School
       On-line activity
    
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LAB activities follow all safety guidelines linked above
and in the activity
Lab #1 Equilibrium lab--- Iron III chloride + SCN- WIS
Lab #2 Equilibrium lab N2O4 WIS
Lab #3 Equilibrium with CuSO4 Washington International School

      
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EXTENSION material for the curious
- investigating the materials in space capsules and the Space Shuttle
Orion capsule 12 thrusters using hydrazine Orion Reference Guide  (with hydrazine N2H4 forming a complex equilibrium with N2O4) NASA
Adenosine-caffeine equilibrium in the brain Smithsonian Learning Lab

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SMOG Activity ANSWERS

 

THINKING ROUTINE

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In the N2O4 lab activity above:

​What equilibrium do you see?

What do you think about the chemistry of the equilibrium?

What does it make you wonder about equilibrium?

WIS   CC BY-NC 4.0 unless otherwise noted

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