Understanding Le Chatelier's Principle

This lesson covers Le Chatelier's Principle, which describes how a system at equilibrium responds to stress. It explains how changes in concentration, pressure, and temperature affect the equilibrium position. The principle is illustrated using examples of reversible reactions, showing how equilibrium shifts to counteract changes. The lesson concludes with a summary of the principle's key points.

What does Le Chatelier's Principle primarily explain?

• The rate of chemical reactions

• How systems at equilibrium respond to external stresses

• The energy changes in reactions

• The formation of new compounds

In the analogy of digging and refilling a hole, what represents the stress on the system?

• The size of the hole

• The type of soil

• The rate of digging

• The number of people digging

What happens to the equilibrium when more reactants are added to a system?

• Equilibrium remains unchanged

• Equilibrium shifts to the right

• Equilibrium shifts to the left

• Equilibrium is destroyed

If the concentration of products is decreased, which direction does the equilibrium shift?

• To the left

• Becomes unstable

• Remains unchanged

• To the right

How does an increase in pressure affect a gaseous equilibrium system?

• Shifts equilibrium to the side with fewer moles

• Shifts equilibrium to the side with more moles

• Destroys the equilibrium

• Has no effect on equilibrium

In a reaction with 2 moles of reactant A and 1 mole of product B, what happens when pressure is decreased?

• Equilibrium remains unchanged

• Equilibrium shifts to the left

• Equilibrium is destroyed

• Equilibrium shifts to the right

What is the effect of decreasing pressure on a system with more moles on the left side?

• Shifts equilibrium to the right

• Shifts equilibrium to the left

• No effect on equilibrium

• Destroys the equilibrium

What is the primary focus of the next lesson mentioned in the video?

• Changes in temperature

• Changes in concentration

• Changes in volume

• Changes in pressure

According to Le Chatelier's Principle, what does a system do when stressed?

• It remains unchanged

• It works to restore equilibrium

• It speeds up the reaction

• It stops the reaction

What is the main takeaway from Le Chatelier's Principle?

• Equilibrium systems are unaffected by external changes

• Equilibrium systems are unpredictable

• Equilibrium systems adjust to minimize stress

• Equilibrium systems are static