Equilibrium & Le Chatelier's Principle

Equilibrium & Le Chatelier's Principle

By Jenny Duke

The big picture

• universe

• surroundings

• system (focus area)​

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Systems

Boundary that affects flow of energy and matter

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System

Barrier still allows free movement of matter (mass) and energy (heat)

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​Open system

Barrier stops free movement of matter (mass) buy allows energy (heat) to move in and out freely

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​Closed system

Barrier does not allow matter (mass) or energy (heat) to flow into or out of the system.

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​Isolated system

Key terms:

collisions

energy

forward reaction

reverse reaction​

​​Equilibrium occurs when

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Activation energy

• forward reaction

• reverse reaction

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​​Reversible reactions

Multiple Select

Which three conditions are necessary for a chemical equilibrium to occur?

• Must have a closed system.

• Must have a constant temperature.

• Must have a low Ea in both directions.

• Must have no gases produced.

Poll

The Ea forward and Ea reverse would suggest this reaction is easily reversible.

• False

• True