Helium is an inert gas; only few unstable molecules containing helium are known. The question of sound doesn't exist.
Bleaching is a chemical reaction.
no
Helium is an element. By definition, elements are the most basic building blocks of matter. Therefore, the only chemical in Helium would be Helium.
That would be the product of the chemical reaction.
Burning is a chemical reaction (oxidation).
A chemical reaction can be represented by a chemical equation.
The reaction in the sun which gives us energy involves helium. If helium didn't exist we would receive no energy and life wouldn't exist on the earth.
A short representation of a chemical reaction would be the net ionic equation.
No, that would probably be considered a physical change. It is only a chemical reaction its chemical makeup is changed.
It would be a chemical change/reaction.
There is one thing that is relative to both helium and hydrogen. Both of these are a type of chemical.
chemical reactions