Please help! Will mark brainlest.
*only right answers*

Balance this equation co2(g) + h2o (g) show that the balanced equation obeys the law if conversation of mass

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?