Question

Classify the following as element and compound-
I) Helium gas.
ll) Water.
Distinguish between irreversible and reversible and reaction​

Answer 1

1. Helium is an element.
2. Water is a compound. :)

Answer 2

Explanation:

Helium gas (He2) is a element because it has sane kind of atoms

Water (H2O) is a compound because it has two different atoms

IRREVERSIBLE REACTION: a reaction in which products cannot be converted into reactants. Eg: CaCO3>CaO+CO2

REVERSIBLE REACTION: a reaction in which products can be converted again into reactants.Eg:N2+3H2>2NH3