Question

A chemical equilibrium exists when: A chemical equilibrium exists when: there are equal amounts of reactants and products. the rate at which reactants form products is the same as the rate at which products form reactants. the sum of reactant and product concentrations equals one mole. reactants are completely changed to products. the rate at which reactants form products becomes zero.

Answer 1

A chemical equilibrium is reached when the forward and reverse reactions occur at equal rates, resulting in no net change in concentrations of reactants and products. It's described by the equilibrium constant K, and the state of the system is dynamic, with ongoing reactions.

Step-by-step explanation:

A chemical equilibrium is reached when the rate of the forward reaction, which converts reactants into products, is exactly balanced by the rate of the reverse reaction, where products revert back to reactants. This is what we call a dynamic equilibrium because, even though the concentrations of reactants and products remain constant over time, the reactions are still occurring. In other words, it's a system in steady state.

The concept of chemical equilibrium is central in the study of chemical reactions and is described by the equilibrium constant, K. This constant is derived from the reaction quotient, Q, which reflects the relative amounts of products and reactants at any point in time. Once the system reaches equilibrium, Q becomes equal to K and no further changes in concentrations are observed, despite the ongoing forward and reverse reactions.

It is important to note that at equilibrium, there are not necessarily equal amounts of reactants and products. The equilibrium concentrations depend on the specifics of the reaction and the value of the equilibrium constant, K. A disturbance in the equilibrium, such as changing the concentration of a reactant or product, will shift the system in a way as to re-establish the equilibrium, according to Le Châtelier's principle.

Answer 2

Answer: A chemical equilibrium exists when the rate at which reactants form products is the same as the rate at which products form reactants.

Step-by-step explanation:

When the concentration of both the reactants and products do not change with time then it means the chemical reaction has reached to a state of chemical equilibrium.

For example,
`CO(g) + Cl_(2)(g) \rightleftharpoons COCl_(2)(g)`

Therefore, we can conclude that a chemical equilibrium exists when the rate at which reactants form products is the same as the rate at which products form reactants.