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.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

a corroding iron, if that's one of your choices