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atomic weight
The atomic weight of helium is 4.
hydrogenate
He hydrogenated fatty acids in a chemical experiment.
(chemistry) hydrogenation; hydride
This compound is stabilized by hydrogenation.
hydrogen sulphide
Hydrogen sulphide is extremely toxic, and particularly at high concentrations, it is lethal to humans.
(weaponry) hydrogen bomb
He was involved in the development of the hydrogen bomb.
immunochemistry
He is dedicated to the study of immunochemistry.
thermochemistry
Thermochemistry is a part of chemistry that deals with the reactions of heat and matter.
(chemistry) a chemical reaction
This chemical reaction is very dangerous.
chemical fiber
This shirt is made of chemical fiber.
chemical weapon
The use of chemical weapons is prohibited by international law.
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