whatisasubscriptinachemicalformula?what'stherelationshipbetweenelementandstom?我科学作业做不出~~~Science!还有几个问题：Howtotellasubstanceisacompoundornotacompound?Howdoesthedensitymakethingssinkoffloat

Question

what is a subscript in a chemical formula?what's the relationship between element and stom?
我科学作业做不出~~~Science!
还有几个问题：
How to tell a substance is a compound or not a compound?
How does the density make things sink of float in a liquid?
chemical formula:carbon dioxide ozone backing soda
答对一定加分!

Answer 1

a subscript of a chemical formula is the number of atoms of the element.
chemical element is the generic terms of a kind of atom that with the same inuclear charge.
and atom is the smallest particles in chemical change.
chemical element is the general term for the same type of atoms; and atoms constitute the basic unit of element.
if a substance with different atoms in it.it is a compound.
if the density of the object is larger than the liquid's.it will sink.
the last question i can't understand whats your meaning.