Equilibrium and Pressure Changes in Chemical Reactions

The video tutorial explains the decomposition of phosphorus pentachloride into phosphorus trichloride and chlorine gas, focusing on equilibrium conditions. It discusses the impact of reducing the reaction vessel's volume on pressure and equilibrium, applying Le Chatelier's principle to predict the reaction's direction. An ICE table is used to calculate new equilibrium pressures, and the final pressures are analyzed to understand the reaction's behavior under stress.

What is the equilibrium constant (Kp) for the decomposition of phosphorus pentachloride at 500 Kelvin?

• 0.250

• 2.000

• 1.000

• 0.500

What happens to the total pressure when the volume of the reaction vessel is decreased from 2 liters to 1 liter?

• It halves

• It doubles

• It remains the same

• It triples

According to Le Chatelier's principle, in which direction will the net reaction move if the pressure is increased?

• It will not change

• Towards the side with more moles of gas

• Towards the side with equal moles of gas

• Towards the side with fewer moles of gas

What does the 'I' in the ICE table stand for?

• Initial

• Increase

• Isothermal

• Ideal

What is the equilibrium partial pressure of PCl5 after the reaction re-establishes equilibrium?

• 0.33 atm

• 1.96 atm

• 2.29 atm

• 1.07 atm

What is the total pressure (P3) after equilibrium is re-established?

• 2.38 atm

• 4.76 atm

• 4.43 atm

• 3.00 atm

Why is the change in pressure not significant after the reaction shifts to re-establish equilibrium?

• Because the volume is too small

• Because the temperature is too high

• Because Kp is close to 1

• Because Kp is very large

How does the Kp value affect the amounts of reactants and products at equilibrium?

• It results in an appreciable amount of both

• It causes a large amount of products

• It causes a large amount of reactants

• It has no effect

What is the relationship between P3 and P1?

• P3 is less than P1

• P3 is twice P1

• P3 is equal to P1

• P3 is greater than P1

What is the final pressure P3 in relation to P2?

• P3 is equal to P2

• P3 is less than P2

• P3 is greater than P2

• P3 is twice P2