Question

multiple - choice question
what is sea water (salt water)?
heterogeneous mixture
homogeneous mixture
compound
element

Explanation:

• A heterogeneous mixture has visibly different parts. Sea water has a uniform composition throughout; it is not heterogeneous.
• A compound is a pure substance formed by chemical bonding of elements. Sea water is a mixture of salt and water (and other substances), not a compound.
• An element is a pure substance that cannot be broken down into simpler substances. Sea water is a mixture, not an element.
• A homogeneous mixture has a uniform composition throughout. Sea water (salt - water solution) has a uniform composition (at least on a macroscopic scale, ignoring any suspended particles which are usually negligible in the context of this question).

Answer:

Homogeneous mixture