Where can most stars be found in the H-R
diagram?
A. Main sequence
B. Supergiants
C. White Dwarfs
D. Red Giants

Which actions would increase the rate at salt dissolves in water? stir the water? crush the salt? use less water? heat the water? cool the salt

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.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?