Barrons SAT Subject Test Chemistry, 13th Edition

I II

30. A substance composed of two or more

elements chemically combined is called a

mixture

BECAUSE

the properties of the constituents of a

mixture are retained.

31. A chemical change involves change in the

composition and molecular structure of the

reactants

BECAUSE

in a chemical reaction bonds are

broken and new substances and new

bonds are formed.

32. The burning of paper is a physical change

BECAUSE

when a chemical change occurs

energy is either gained or lost by the

reactants.

*Fill in oval CE only if II is a correct explanation of I.