The copper mineral chalcocite, Cu2S, can be converted to copper simply by heating in air according to this balanced equation:

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Which fact represents evidence for the big bang theory?

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions