Relatively inexpensive minerals such as trona, sand, and feldspar are usually used instead of pure chemicals.

The simple soldiers in the army of science are left without even simple means, like personal computers or pure chemicals.

These days things were much more satisfactory: absolute immunity from the law, pure chemicals to work with, the best apparatus, and an unlimited budget.

Several of the mentioned high-performance glasses are expensive because highly pure chemicals must be produced in substantial quantities.

A system involving one pure chemical is an example of a one-component system.

First, the distinction between pure chemical versus somatosensory information is often problematic.

TCDD has never been produced commercially except as a pure chemical for scientific research.

All of these doses refer to the mentioned formulation, not the pure chemical.

In the laboratory mostly pure chemicals are used.

This made for the beginning of the modern era in pharmacology, as pure chemicals, instead of crude extracts, became the standard drugs.