The solubility product of PbBr2 is 8.9 * 10^-6. Determine the molar solubility (a) in pure water, (b) in 0.20 M KBr solution, (c) in 0.20 M Pb(NO3)2

Embryos of different species look very similar, which shows that the organisms share a ancestor.

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 sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.