aqueous solutions of lead nitrate and potassium iodide are combined in a test tube. the best proof that a chemical reactions has occurred would be that
a) the solution is yellow.
b) both reactants are aqueous solutions.
c) a yellow precipitate settles to the bottom.
d) lead and potassium are both metals and will replace each other.

Coal i believe hope this

1. why does the same side of the moon always face earthc.the rotational period of the moon is equal to one revolution around earth2. which is greater the moons period of rotation or its period of revolution  b.the moons revolution period around earth3.what was the major accomplishment of the apollo missions  d.landing on and exploring the moon4. which of these space missions involved the deployment of lunar rovers d.apollo5. which scientists are going to explore next on kepler-186fd. evidence of existence of life6.which mission is not going to explore the outside of the solar systemb.safir7.which technology limit the future of space exploration b. scientist must first develop certain technologies before missions can be completed.

The fraction of an original sample of tritium that remains unchanged after 24.62 years is 1/4. if you need the percentage it is 25%