. Tiana is a chemist who is making a chemical to add to swimming pools in order to
make the water safer. She mixed two solid
substances together in a sealed container.
The diagram above shows the repeating
groups of atoms that make up the two
starting substances.
After mixing, Tiana found two liquid
substances in the sealed container. (Nothing
had escaped.) Which of the diagrams to the
left shows the repeating groups of atoms
that make up the ending substances?