Write formulas for compounds formed from these pairs of ions. a. NH4^+, SO3^2-

b. Calcium ion, Phosphate ion

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

How far is the region from the equator or control climate

What are scientists who study fossils called? ( a ) astronomers. ( b ) biologists. ( c ) geologists. ( d ) paleontologists.