Which of the following is true about chemical equilibrium systems?

a. they are open systems.
b. the macroscopic properties are not constant.
c. forward and reverse reaction rates are not equal.
d. the concentrations of reactants and products are not always equal.

The correct answer is option D.

Explanation:

Characteristics of chemical equilibrium:

Chemical equilibrium are attained is closed system.The macroscopic remains constant like: volume, pressure, energy etc.Rate of forward reaction is equal to the rate of backward reaction.The concentration of the reactants and products remain constant.They are not always equal.

From the given options the correct option is D.

3
A fish farmer stocked two ponds (A, B) with 20 fish each (mix of male and female). He
measured the population size of each pond over time. The data are shown in the graph.
1600
1400
1200
1000
Population size
800
400
Population A
Population B
200
15
20
10
Generation
Which hypothesis BEST explains the difference in the sizes of the two fish populations?
A
Pond A has the same temperature as Pond B.
B
Pond B has more available food than Pond A.
C
Pond A started with more fish than pond B.
D
Pond A has more available food than Pond B.