reacting a measured volume of a standard solution with a measured volume of the solution of unknown concentration is called volumetric flask​

Is this a single replacement reaction or there is no

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 density, d, of a substance with a volume of v = 12.5 cm3 and a mass of m = 74.4 g ?