Which metal will react spontaneously with a Cr3+ ion but not with a Ca2+ ion? A) Co
B) Li
C) Mg
D) Pb
E) Metals will all react in the same way with these ions.

I know the answer is Mg, but why?

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

3) in peaches, [oh]=3.16x10-11 m a) find [h+ ] b) what is the ph? c) is the solution acidic, basic, or neutral?

Table sugar completely dissolved in water is an example of a?