Englishfor English speakers
reagent
—
noun
a chemical agent for use in chemical reactions
for
Preposition
—
shows that something belongs to something else, or has a specific function
This cake is for you.
This is a net for catching fish.
—
For is used to show the reason for something
He was angry, for he had never been called such terrible names before.
for
Subordinator
—
For introduces a clause with a subject and a to-infinitive
It's not good for you to be too relaxed.
acetylene
—
noun
a colorless flammable gas used chiefly in welding and in organic synthesis
hydrocarbon
Noun
—
A chemical compound made out of carbon and hydrogen. Other elements could also be included.
—
Csubx/subHsuby/sub,and mathy/math is even number.