Which of the following is evidence that matter is too small to be seen without magnification? aFeeling the heat come off the flames of a fire
bFeeling the grains of salt in between your fingers
cWatching salt disappear when it dissolves in water
dWatching rain fall from the sky during a thunderstorm

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.

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

Consider the story you just read. all but one of the choices below indicate that something is living.