Equilibrium and Reaction Rates

The video tutorial explains the concept of chemical equilibrium using the reaction of nitrogen and hydrogen to form ammonia. It introduces Le Chatelier's principle, demonstrating how changes in concentration, pressure, or temperature can shift the equilibrium. The tutorial uses graphs to illustrate how increasing nitrogen concentration favors the forward reaction, while decreasing hydrogen concentration favors the reverse reaction. The video emphasizes that changes in these factors affect the reaction rate, independent of equilibrium shifts.

What indicates that a system has reached equilibrium in a reaction involving nitrogen and hydrogen?

• The presence of parallel lines

• A sudden increase in temperature

• The formation of a precipitate

• A decrease in pressure

According to Le Chatelier's principle, what happens when the concentration of nitrogen is increased in a system at equilibrium?

• The system remains unchanged

• The system shifts to decrease temperature

• The system shifts to increase pressure

• The system shifts to decrease nitrogen

When the forward reaction is favored due to increased nitrogen concentration, what happens to the amount of ammonia?

• It increases

• It forms a new compound

• It decreases

• It remains constant

What is the effect of increasing pressure, concentration, or temperature on the reaction rate?

• The reaction rate decreases

• The reaction rate remains the same

• The reaction rate increases

• The reaction rate becomes unpredictable

What happens to the reaction rate when the concentration of hydrogen is decreased?

• The reaction rate increases

• The reaction rate decreases

• The reaction rate remains constant

• The reaction rate becomes zero

When the reverse reaction is favored due to a decrease in hydrogen concentration, what happens to the amount of nitrogen?

• It decreases

• It forms a new compound

• It remains constant

• It increases

How does the system reach a new equilibrium after a change in concentration?

• By altering the pressure

• By changing the temperature

• By adjusting the rates of forward and reverse reactions

• By forming a new compound

What is the primary factor that determines whether the forward or reverse reaction is favored?

• The change in concentration

• The initial temperature

• The initial pressure

• The presence of a catalyst

What happens to the ammonia concentration when the reverse reaction is favored?

• It remains constant

• It decreases

• It increases

• It forms a new compound

What is the effect on the system's speed when any of the three factors (pressure, concentration, temperature) is decreased?

• The speed increases

• The speed remains the same

• The speed decreases

• The speed becomes unpredictable