Question

why is seawater not classified as a pure substance? a) samples taken from different locations have the same composition. b) samples taken from different locations vary in composition. c) samples taken from different locations have the same properties. d) samples taken from different locations contain the same elements.

Explanation:

A pure substance has a fixed and uniform composition. Seawater is a mixture of water, salts, and other substances. Samples of seawater from different locations can vary in the amount of salts and other dissolved components, meaning their composition is not fixed.

Answer:

B. Samples taken from different locations vary in composition.