Acatalyst -
a. causes a reaction.
b. increases a reaction's rate.
c. has no effect on a reaction.
d. raises the temperature for a reaction.

Why does a red shoe appear red in daylight

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.

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?