If an ice cube melts at 0°c but water also freezes at 0°c, what is the difference between melting and
freezing in terms
8. the energy involved in the phase changes and
9. the motion of the particles of the substances during the phase changes?

Complete the table for ion charge based upon their losing or gaining electrons in the outer shell. (use the periodic table as necessary.) group most likely ionic charge # of valence electrons i +1 ii +2 iii +3 iv +4 or -4 v -3 vi -2 vii -1 viii 0

One way that radioactive waste is treated is by burying it in repositories. the repositories are found only in states with very low populations. true or false? a. trueb. false(also i meant to put high school but it put down middle school instead)

In 2002, the rare earth elements mine in mountain pass, california was closed because