Chemists study a substance at the atomic and molecular level and analyze how substances interact with each other.
They usually do the following:
They use technology and advanced software to study the structure of complicated structures. Usually, chemists work in teams with other chemists and scientists in different fields to accomplish a common task.
Usually, an experiment is carried out by a group of chemists and scientists in other fields.
Image Source: https://medchem.ku.edu/sites/medchem.ku.edu/files/images/general/groups/altman/research-group/Altman-Group-2017.jpg