chemical substance
chemical **

Research chemicals are chemical substances used for research purposes.

Your business may need to transport dangerous substances, such as chemical substances, by road or rail.

You can look up chemical substances and compounds alphabetically.

He believed that toxins and antitoxins were chemical substances at a time when very little was known about their nature.

- These are due to chemical substances that absorb some wavelengths of the incident light and reflect others.

Inclusions - chemical substances found suspended directly in the cytosol.

These chemical substances are known to be very toxic, persistent and bioaccumulative.

The third complex of issues relates to chemical substances and heavy metals in toys.

Psychoactive drugs are chemical substances that act on the brain to create psychological effects.

Like other glands, testicles make chemical substances, called hormones that keep the body working.