the addition of a catalyst to a chemical reaction would change the:

a. heat of reaction

b. enthalpy of the reactants

c.enthalpy of the products

d. activation energy

a solution in which equilibrium is reached between dissolved and undissolved solute is:

a. saturated

b.unsaturated

c. supersaturated

which is the common ion when hydrochloric acid is added to a saturated solution of sodium chloride?

a. hydrogen ion

b. chloride ion

c. sodium ion

d. hydroxide ion