Copper Complexes and Chemical Equilibrium

The video demonstrates Le Chatelier's Principle using copper complexes. It explains how a system at equilibrium can be disrupted by adding ammonia, forming a dark blue copper-ammonia complex. Adding hydrochloric acid removes ammonia, reverting the solution to a sky blue copper-water complex. The video illustrates how equilibrium can shift between reactants and products, indicated by color changes.

What is the main idea behind Le Chatelier's Principle?

• A system at equilibrium will always favor the products.

• A system at equilibrium will remain unchanged.

• A system at equilibrium will always favor the reactants.

• A system at equilibrium will adjust to counteract changes.

What color does the copper chloride solution turn when ammonia is added?

• Red

• Yellow

• Green

• Dark blue

What is the initial color of the copper chloride solution?

• Yellow

• Dark blue

• Sky blue

• Green

What role does hydrochloric acid play in the reaction?

• It forms a new complex with copper.

• It removes ammonia from the solution.

• It increases the concentration of copper ions.

• It turns the solution green.

What is formed when ammonia reacts with copper in the solution?

• A green precipitate

• A dark blue complex

• A colorless gas

• A red solution

What happens to the color of the solution when hydrochloric acid is added?

• It remains dark blue.

• It turns red.

• It turns sky blue.

• It becomes colorless.

Why can't the ammonium ion form a complex with copper?

• It cannot donate electrons like ammonia.

• It does not have the right shape.

• It lacks the necessary charge.

• It is too large.

How can the equilibrium be shifted back to the dark blue state?

• By adding more hydrochloric acid.

• By adding more ammonia.

• By heating the solution.

• By cooling the solution.

What is demonstrated by shifting the equilibrium between sky blue and dark blue?

• The formation of precipitates in solutions.

• The dynamic nature of chemical equilibrium.

• The effect of pressure on gas reactions.

• The effect of temperature on reaction rate.

What is the purpose of the demonstration using copper complexes?

• To illustrate Le Chatelier's Principle.

• To show how to create new compounds.

• To determine the pH of the solution.

• To measure the concentration of copper ions.