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Chemical Equilibrium: Reversible Reactions and Equilibrium Constant

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Chemical Equilibrium: Reversible Reactions and Equilibrium Constant

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Questions and Answers

What is the defining characteristic of a reversible reaction?

It involves only reactants

It only occurs in one direction

It proceeds to completion

It reaches an equilibrium state (correct)

What is the necessary condition for equilibrium in a reversible reaction?

Equal concentrations of reactants and products (correct)

Presence of catalysts

Absence of products

Unlimited supply of reactants

In a complete reaction, what happens to all the reactants?

They are converted into products (correct)

They disappear

They are used up

They remain unchanged

What is the Law of Mass Action related to?

Concentration of reactants and products Signup and view all the answers

What happens to most chemical reactions in terms of completion?

They never go to completion Signup and view all the answers

What is responsible for the existence of life on Earth?

The delicate equilibrium phenomenon in the atmosphere Signup and view all the answers

What is the macroscopic characteristic of the reverse reaction in a reversible reaction?

Equal rate with the forward reaction Signup and view all the answers

What do reversible reactions in chemistry involve?

Products recombining to form reactants Signup and view all the answers

What is the main characteristic of irreversible reactions?

They never go to completion Signup and view all the answers

What is a common example of a reversible reaction in everyday life?

Formation of water from hydrogen and oxygen Signup and view all the answers

What happens when hydrogen iodide is heated in a closed flask?

Formation of purple iodine vapors Signup and view all the answers

What does the purple color fading in the reaction between hydrogen and iodine indicate?

The forward reaction Signup and view all the answers

What do aquatic plants and animals indirectly depend on for their lives?

The concentration of dissolved oxygen in water Signup and view all the answers

What is the main role of equilibrium phenomenon in the atmosphere for life on Earth?

Supporting the existence of life on Earth Signup and view all the answers

What does the delicate equilibrium phenomenon support in environmental systems?

The existence and balance of environmental systems Signup and view all the answers

What do irreversible reactions involve?

Formation of new substances only Signup and view all the answers