Zn2+ and al3+ are amphoteric. demonstrate
howal(oh)3(s) and zn(oh)2(s) react in
anamphoteric manner (show balanced chemical equations),

write balanced chemical reactions for the following:
a. nh3 was added to cu2+ and
tofe3+ and water.
b. nh3 was added to zn2+ and
toal3+ and water.

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .