Which describes a solution that contains a system at equilibrium? explain your answer. a. one in which the color is not changing due to the rate that the product forms is equal to the rate the reactant reforms.
b. one in which the color of the solution is changing slowly due to the formation of the product
c. one in which the color of the solution is changing slowly due to the formation of the reactants
d. one in which the color is not changing due to all reactions have stopped

A

Explanation:

A reactionis said to be at equilibrium when the rate of forward reaction equals the rate of reverse reaction. That means the rate at which the product is formed equals the rate at which the reactants are reformed. The colour of the solution does not change at this point because the both reactions are exactly balanced.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.