Pure substances can be elements or compounds. An element is a form of matter that cannot be broken down by chemical reactions into simpler substances. A compound is a substance composed of two or more different types of elements ,chemically combined in a fixed ratio. 2.(a) Elements and compounds are called as pure substances because it is made up of *
a. same kind of atoms or molecules
b. different kinds of atoms or molecules
c. heterogeneous mixtures
d. solutions
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