Understanding Le Chatelier's Principle

What is Le Chatelier's Principle?

• Le Chatelier's Principle explains the behavior of solids in chemical reactions.

• Le Chatelier's Principle only applies to gas reactions.

• Le Chatelier's Principle states that all reactions are irreversible.

• Le Chatelier's Principle describes how a system at equilibrium responds to changes in concentration, temperature, or pressure.

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NGSS.HS-PS1-5

Name one factor that can affect chemical equilibrium.

• Change in volume

• Change in temperature

• Change in pressure

• Change in concentration

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NGSS.HS-PS1-6

How does increasing the temperature affect an exothermic reaction at equilibrium?

• The reaction rate increases significantly without changing equilibrium.

• Temperature has no effect on the equilibrium position.

• The equilibrium shifts to the left, favoring reactants.

• The equilibrium shifts to the right, favoring products.

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NGSS.HS-PS1-6

What happens to the equilibrium position if the concentration of a reactant is increased?

• The equilibrium position shifts to the right, favoring product formation.

• The equilibrium position moves to the center, balancing both reactants and products.

• The equilibrium position shifts to the left, favoring reactant formation.

• The equilibrium position remains unchanged.

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NGSS.HS-PS1-5

NGSS.HS-PS1-6

Explain how pressure changes can shift equilibrium in gaseous reactions.

• Equilibrium is only affected by temperature changes in gaseous reactions.

• Pressure changes can shift equilibrium in gaseous reactions by favoring the side with fewer or more moles of gas, depending on whether pressure is increased or decreased.

• Increasing pressure always favors the side with more moles of gas.

• Pressure changes have no effect on gaseous reactions.

Provide an example of a real-world application of Le Chatelier's Principle.

• The process of photosynthesis in plants.

• The production of ethanol from corn fermentation.

• The Haber process for ammonia synthesis.

• The extraction of gold using cyanide leaching.

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NGSS.HS-PS1-5

What effect does decreasing the volume of a container have on a reaction at equilibrium?

• The temperature of the reaction decreases.

• The equilibrium shifts towards the side with more moles of gas.

• The equilibrium shifts towards the side with fewer moles of gas.

• The reaction rate increases significantly.

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NGSS.HS-PS1-6

How can Le Chatelier's Principle be used to predict the outcome of a chemical reaction?

• Le Chatelier's Principle states that reactions will always proceed to completion.

• Le Chatelier's Principle indicates that increasing temperature will always favor the formation of products.

• Le Chatelier's Principle only applies to reactions at equilibrium and cannot predict shifts.

• Le Chatelier's Principle can predict that a system will shift in the direction that counteracts changes in concentration, temperature, or pressure.

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NGSS.HS-PS1-5