Equilibrium

In an exothermic reaction, where is the energy transferred from?

• Energy is transferred from the reactants to their surroundings.

• Energy is transferred from the surroundings to the reactants.

• Energy is transferred from the products to the reactants.

• Energy is transferred from the environment to the products.

What is dynamic equilibrium?

• A state where the forward reaction is faster than the reverse reaction.

• A state in which the rate of the forward reaction equals the rate of the reverse reaction, resulting in no net change in the concentration of reactants and products.

• A condition where all reactants are completely converted to products.

• A temporary state that occurs only during the initial phase of a reaction.

What is the role of concentration in shifting equilibrium?

• Changing the concentration of reactants or products will shift the equilibrium position to counteract the change.

• Concentration has no effect on the equilibrium position.

• Increasing concentration of products will always shift equilibrium to the left.

• Decreasing concentration of reactants will always shift equilibrium to the right.

How does adding a catalyst affect the position of equilibrium?

• It shifts the position of equilibrium to the right.

• It shifts the position of equilibrium to the left.

• It does not shift the position of equilibrium; it only speeds up the rate at which equilibrium is reached.

• It changes the equilibrium constant of the reaction.

In which state of matter do changes in pressure affect equilibrium?

• Solid state

• Liquid state

• Gaseous state

• Plasma state

What is Le Chatelier's Principle?

• Le Chatelier's Principle states that a reaction at equilibrium will always favor the formation of products.

• Le Chatelier's Principle states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium will shift to counteract the change.

• Le Chatelier's Principle states that increasing temperature will always shift the equilibrium to the left.

• Le Chatelier's Principle states that the concentration of reactants will always remain constant during a reaction.

What is the difference between a physical change and a chemical change in the context of equilibrium?

• A physical change alters the chemical composition of a substance, while a chemical change does not.

• A physical change involves a change in state or appearance without altering the chemical composition, while a chemical change involves the formation of new substances.

• A physical change results in the creation of new substances, while a chemical change only changes the state of matter.

• A physical change is reversible, while a chemical change is always irreversible.

What effect does increasing pressure have on gaseous reactions?

• Increasing pressure shifts the equilibrium position towards the side with fewer moles of gas.

• Increasing pressure shifts the equilibrium position towards the side with more moles of gas.

• Increasing pressure has no effect on the equilibrium position.

• Increasing pressure increases the rate of reaction without affecting equilibrium.

What is the significance of ΔH in a chemical reaction?

• ΔH indicates the temperature change during a reaction.

• ΔH represents the change in enthalpy, indicating whether a reaction is exothermic (negative ΔH) or endothermic (positive ΔH).

• ΔH measures the concentration of reactants in a reaction.

• ΔH is the rate at which a reaction occurs.

What is an exothermic reaction?

• A reaction that absorbs heat from its surroundings.

• A reaction that releases energy in the form of heat to its surroundings.

• A reaction that occurs only in the presence of a catalyst.

• A reaction that involves the breaking of chemical bonds without energy change.