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12. What do you call the materials with
definite or constant composition?
A. Heterogeneous
C.Homogeneous
B. Pure substance
D. Mixture​


Sagot :

The answer is B. Pure substance.

  • A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. On the other hand, mixtures are physical combinations of two or more elements and/or compounds. Mixtures can be classified as homogeneous or heterogeneous.

- Hope it helps.:))

Answer:

B

Explanation:

A chemical substance is a form of matter having constant chemical composition and characteristic properties. ... Chemical substances are often called 'pure' to set them apart from mixtures.