1. A chemist has 2 samples of hydrates. When heated, they lose a different percentage of their original mass. Are they the same or different hydrates? Explain.
2. Cobalt chloride paper is used to test for the presence of water leaking through tiny
cracks in pipes or porcelain.
A. When moisture is present, the test paper goes from blue to pink. Which color
is the hydrated form of cobalt chloride and which color in the anhydrous form?
B. Cobalt chloride paper is carcinogenic. What does that mean? Explain why the
paper should be handled with care
