4. Zn + 2HCI → ZnCI, + H,
What volume of hydrogen at STP is produced when 2.5 g of zinc react with an
excess of hydrochloric 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 .

C. definite shape, definite volume. that is a solid.

The closer the atoms are to becoming ionic the more highly dense the negatively charged side gets.