The mythical philosopher's stone, or sorcerer's stone, is said to be a chemical substance capable of turning lead into gold.
CAS assigns unique CAS Registry Numbers to chemical substances.
The isoenzyme pattern and the activity of hydrogen peroxidase were analysed. The activity of certain chemical substance in larva's saliva gland was verified.
Every chemical substance is a key to the gates of heaven and hell.
A chemical substance, such as acetylcholine or dopamine, that transmits nerve impulses across a synapse.
This chemical substance can be resolved into an acid and oxygen.
Seven functions of views about chemical substance, which are motivation, choose, interpret, establish, transplant, creation and direction, have importance influences students' learning chemistry.
The carbon-sulfur analyzer was corrected by mens of the pure chemical substance and was used to determine carbon content in titanium alloys.
