What does a mass number mean and what does an atomic number mean?

Which term describes a fracture in the earth at which land stays in the same place? a. joint b. fault c. split d. hinge

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?