All of the following are evidence of chemical changes except:

a) talking antacid for heartburn

b) cooking steak

c) salt dissolving in water

d) grass growing

Amixture initially contains a, b, and c in the following concentrations: [a] = 0.300 m , [b] = 1.05 m , and [c] = 0.550 m . the following reaction occurs and equilibrium is established: a+2b⇌c at equilibrium, [a] = 0.140 m and [c] = 0.710 m . calculate the value of the equilibrium constant, kc.

The biosphere of the earth is made up of what compound? organic or inorganic?

Did the detergents containing enzymes work better at removing stains than those containing no enzyme? why or why not?