What mineral is used in paint and roofing, is nonmetallic, has cleavage, and a hardness of 2?

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.

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule