Why do we have to add acid to water but not water to acid

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 .

The correct answer should be "electrons orbit the nucleus in circular motions exactly as shown on the classic bohr model."

Ok so co(g) is not pronoused that. the only clue is that youpronouse it the oppisote way.