All in the universe is a chemical compound or atomic/nuclear particles.
Now are known more than 60 000 000 chemicals and the number is increasing.
nothing would exist
Ununoctium exist as an artificial chemical element.
Not exactly but food, like any gas, liquid or solid, is made up of one or more chemicals. Plants growing is 'chemical change'. Food rotting is 'chemical change' Cooking food is 'chemical change'. Without 'chemical change' or chemical reactions, plants would not exist. Human beings would not exist. Anything we eat would not exist. Planet Earth would not exist!
Sodium oxide is a chemical compound with the formula Na2O. It is used in ceramics and glasses.- From the WikipediaYes Na2O does exist.
This oxide doesn't exist.
Yes, reversible chemical reactions exist.
Sorry, but there's no such chemical, not even C2H5 does exist. So, ... it doesn't have a name in chemistry.
Ununquadium is an artificial chemical element.
I suppose that the chemical formula P2O doesn't exist.
ALH4 doesn't exist; AlH3 is the chemical formula of aluminium hydride.
The chemical formula of sulfur carbonate is (CS2O3)n.
This compound doesn't exist.