How many moles of calcium chloride are there when you have 55.5 grams of calcium chloride(CaCl2)

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Iron (3) oxide will decompose in the presence of hydrogen gas and heater to produced iron and digydrogen monoxide white a balanced chemical equation

Explain how global warming could have affected yellowstone frog and salamander habitat's, resulting in changes in the populations of these species