Which happens when a reversible reaction reaches a state of chemical equilibrium? A. The system runs out of reactant particles.

B. The concentrations of reactants and products are equal.

C. The activation-energy barrier is eliminated.

D. The rates of forward and reverse reactions are equal.​

In salt water solution, the salt is the blank

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.