Santiago is a chemist working to make a new kind of antacid, which is a medicine
that helps with stomach pain. He mixed
two powdery 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, Santiago 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?