Which answer describes a chemical reaction in equilibrium? 1. the reactants are all used up 2. all the product is formed 3. the forward and reverse reactions have ceased 4. the forward and reverse reaction rates are the same

Answer is: 4. the forward and reverse reaction rates are the same.

The reaction rate is the speed at which reactants are converted into products.

The formation constant can be calculated when chemical equilibrium is reached, when the forward reaction rate is equal to the reverse reaction rate.

In a chemical reaction, chemical equilibrium is the state in which both reactants and products are present in concentrations which have no further tendency to change with time.  

Reaction rates of the forward and backward reactions are equal and there are no changes in the concentrations of the reactants and products.

here is table 2-2:

country

percent of eligible voters that voted

rank

united states

44.9%

138

canada

60.1%

107

costa rica

84.6%

14

hungary

66.9%

82

japan

57.0%

118

egypt

27.7%

159

south africa

85.5%

10

ans is no, the data set cannot be plotted as a single circle graph