Why is modern chemistry considered scientific? ?

Chemistry now depends on empirical data rather than mere reasoning.

Explanation:

Modern chemistry is considered scientific because it depends on the scientific method.

Science is empirical in nature. Hypothesis are confirmed based on careful observation and experimentation before inferences are made based on experimental observations.

Chemistry in ancient times was based mostly on thought and reasoning. A typical example is the phlogiston theory which had no experimental backup.

Today chemistry entirely depends on evidences which are reproducible rather than mere reasoning.

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation: