Which diagram represents a physical change, only?

How manyatoms of mercury are in 1.4214e+1 ml sample

Which type of bonding involves the complete transfer of a valence electron from a less electrogrative atom to a more electronegative one

The graph indicates the running route for tobias. which best describes his run? from time 0 to 6, he went fast and then slowed down. from time 6 to 10, he was at his slowest. from time 12 to 14, he went very slow. from time 14 to 18, he went toward the starting point.