Question

Why is water considered a pure substance and not a mixture?

A. Water can be separated physically into hydrogen and oxygen.
B. Water is not a pure substance. Its a mixture.
C. Water is clear.
D. Water can be separated chemically into hydrogen and oxygen.

Answer 1

D. Water can be separated chemically into hydrogen and oxygen.

Step-by-step explanation:

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Answer 2

Water is made of only one molecule which can be chemically separated into hydrogen and oxygen. The answer is D.