Dynamic equilibrium

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  1. What is equilibrium?
  2. Can reactions reverse?
  3. Open and closed systems.
  4. Dynamic equilibrium.
  1. Understand how equilibrium and reversible reactions occur.
    The reaction between substances A and B to produce C and D is described below in an equation.

    A (g) + 2B (g) \, \, C (g) + D (g)

    The reaction takes place at high temperature and pressure with the container sealed. 
    1. Explain how sealing the reaction container could establish an equilibrium.
    2. Explain why leaving this reaction unsealed creates other practical problems.