What is the Rationale for learning the pH of everyday substances?

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

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.

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure