LeChatelier's Principle

For the equilibrium reaction
2NH₃(g) + 22 kJ ↔ N₂(g) + 3H₂(g),
which of the following changes would result in the formation of more N₂ and H₂ at equilibrium?

• increasing temperature
• adding N₂
• removing NH₃

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NGSS.HS-PS1-5

2.In the Haber process, gaseous ammonia is produced on an industrial scale by combining nitrogen and hydrogen gases, according to this equation: 
N₂(g) + 3H₂(g) ↔ 2NH₃(g)
The process is exothermic. Which of the following actions will shift the reaction in the forward (product) direction?

• Increase the temperature of the reaction.
• Reduce ammonia (NH3) concentration by removing ammonia from the reaction chamber.

• Reduce hydrogen concentration by reducing the amount of hydrogen in the reaction chamber.

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NGSS.HS-PS1-5

NGSS.HS-PS1-6

The principle that states that if a system at equilibrium is disturbed, the reaction will proceed in one direction or another in order to reestablish equilibrium, is known as:

• The principle of equilibrium
• Priestley’s principle
• Le Chatelier’s principle
• Faraday’s principle

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NGSS.HS-PS1-6

What is the effect of changing the concentration of one of the reactants in an equation at equilibrium?

• the reaction will stay at equilibrium
• the reaction will stop
• the reaction will continue to completion
• the reaction will shift to re-establish equilibrium.

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NGSS.HS-PS1-6

A system at equilibrium means it is still reacting.

• True
• False

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NGSS.HS-PS1-6

For an endothermic reaction, heat can be thought of as:

• a reactant
• a product
• either it has no effect
• neither it effects both sides equally.

Increasing the concentration of the reactants will:

• shift the reaction to the left towards the reactants, making more of the reactants.
• shift the equilibrium to the right towards the products, making more of the product.
• Have no effect on equilibrium.

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NGSS.HS-PS1-5

NGSS.HS-PS1-6

Increasing the temperature of an exothermic reaction will:

• shift the reaction to the left towards the reactants, making more of the reactants.
• shift the equilibrium to the right towards the products, making more of the product.
• Have no effect on equilibrium.

Tags

NGSS.HS-PS1-6

For the reaction...
SO₂ + O₂  <−>  SO₃
If the concentration of SO₂ is increased, the equilibrium of the reaction will shift ___________.

• left
• right
• left and right 
• neither left nor right

Tags

NGSS.HS-PS1-5

For the reaction...
SO₂ + O₂ <−>  SO₃
If the concentration of O₂ is decreased, the equilibrium of the reaction will shift ___________.

• left
• right
• left and right
• neither left nor right

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6