Chemical

A chemical was a type of substance that could do several things. Chemicals could be represented by chemical formulas, such as NH4NO3. (TV: The Keys of Marinus)

Life was a chemical process. (TV: The Mutants)

The 456 found that human children produced chemicals which felt "good". (TV: Children of Earth: Day Five)

Mia Bennett proved that Earth plant life could grow on Martian soil with the help of chemicals. (TV: The Waters of Mars)

Dangers posed by chemicals
Chemicals could be dangerous to health or to the environment.

By 2007, a sign in a Deffry Vale High School classroom warned of "dangerous chemicals" within a cupboard. (TV: School Reunion)

Specific chemicals
Some types of chemicals included:


 * Water (TV: The Power of the Daleks)
 * Parrinium (TV: Death to the Daleks)
 * Pentocyleinicmethyldrane (TV: The Sun Makers)
 * Hexachromite (TV: Warriors of the Deep)
 * Halides (TV: Frontios)
 * Silica (TV: Frontios)
 * Mustakozene-80 (TV: Timelash)
 * Adrenaline (TV: The Runaway Bride)
 * Acetylcholine (TV: The Runaway Bride)
 * Endorphins (TV: The Runaway Bride)
 * Mood drugs (TV: Gridlock)
 * Ammonium nitrate (TV: Nikola Tesla's Night of Terror)
 * Zinc (TV: Nikola Tesla's Night of Terror)