What are the two changes in matters

There are two types of change in matter: physical change and chemical change. As the names suggest, physical changes affect physical properties, and chemicalchanges affect chemical properties. Chemical changes are also known as chemical reactions.

The density would be 1.622

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 .