Question

water is considered a: a. pure substance → element b. pure substance → compound c. mixture → homogeneous d. mixture → heterogeneous

Explanation:

Water is a pure substance as it has a definite composition (H₂O). It is made up of two different elements (hydrogen and oxygen), so it is a compound, not an element. A mixture is a combination of two or more substances, which water is not.

Answer:

B. Pure substance → Compound