Question

A reaction is at equilibrium when...

A. the amounts of the reactants and products are not longer changing.
B. the reactants have all turned into products.
C. the products have all turned into reactants.
D. the amounts of the reactants and products are equal.

Answer 1

Option A. is correct

Step-by-step explanation:

A reaction is at equilibrium when the amounts of the reactants and products are no longer changing.

Chemical equilibrium means that the rate of formation of products is equal to the rate at which the products re-form reactants.

Products are formed by the forward reaction and by the reverse reaction, the products re-form reactants.